| /* Analysis Utilities for Loop Vectorization. |
| Copyright (C) 2006-2020 Free Software Foundation, Inc. |
| Contributed by Dorit Nuzman <dorit@il.ibm.com> |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "backend.h" |
| #include "rtl.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "ssa.h" |
| #include "expmed.h" |
| #include "optabs-tree.h" |
| #include "insn-config.h" |
| #include "recog.h" /* FIXME: for insn_data */ |
| #include "fold-const.h" |
| #include "stor-layout.h" |
| #include "tree-eh.h" |
| #include "gimplify.h" |
| #include "gimple-iterator.h" |
| #include "cfgloop.h" |
| #include "tree-vectorizer.h" |
| #include "dumpfile.h" |
| #include "builtins.h" |
| #include "internal-fn.h" |
| #include "case-cfn-macros.h" |
| #include "fold-const-call.h" |
| #include "attribs.h" |
| #include "cgraph.h" |
| #include "omp-simd-clone.h" |
| #include "predict.h" |
| #include "tree-vector-builder.h" |
| #include "vec-perm-indices.h" |
| |
| /* Return true if we have a useful VR_RANGE range for VAR, storing it |
| in *MIN_VALUE and *MAX_VALUE if so. Note the range in the dump files. */ |
| |
| static bool |
| vect_get_range_info (tree var, wide_int *min_value, wide_int *max_value) |
| { |
| value_range_kind vr_type = get_range_info (var, min_value, max_value); |
| wide_int nonzero = get_nonzero_bits (var); |
| signop sgn = TYPE_SIGN (TREE_TYPE (var)); |
| if (intersect_range_with_nonzero_bits (vr_type, min_value, max_value, |
| nonzero, sgn) == VR_RANGE) |
| { |
| if (dump_enabled_p ()) |
| { |
| dump_generic_expr_loc (MSG_NOTE, vect_location, TDF_SLIM, var); |
| dump_printf (MSG_NOTE, " has range ["); |
| dump_hex (MSG_NOTE, *min_value); |
| dump_printf (MSG_NOTE, ", "); |
| dump_hex (MSG_NOTE, *max_value); |
| dump_printf (MSG_NOTE, "]\n"); |
| } |
| return true; |
| } |
| else |
| { |
| if (dump_enabled_p ()) |
| { |
| dump_generic_expr_loc (MSG_NOTE, vect_location, TDF_SLIM, var); |
| dump_printf (MSG_NOTE, " has no range info\n"); |
| } |
| return false; |
| } |
| } |
| |
| /* Report that we've found an instance of pattern PATTERN in |
| statement STMT. */ |
| |
| static void |
| vect_pattern_detected (const char *name, gimple *stmt) |
| { |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, "%s: detected: %G", name, stmt); |
| } |
| |
| /* Associate pattern statement PATTERN_STMT with ORIG_STMT_INFO and |
| return the pattern statement's stmt_vec_info. Set its vector type to |
| VECTYPE if it doesn't have one already. */ |
| |
| static stmt_vec_info |
| vect_init_pattern_stmt (gimple *pattern_stmt, stmt_vec_info orig_stmt_info, |
| tree vectype) |
| { |
| vec_info *vinfo = orig_stmt_info->vinfo; |
| stmt_vec_info pattern_stmt_info = vinfo->lookup_stmt (pattern_stmt); |
| if (pattern_stmt_info == NULL) |
| pattern_stmt_info = orig_stmt_info->vinfo->add_stmt (pattern_stmt); |
| gimple_set_bb (pattern_stmt, gimple_bb (orig_stmt_info->stmt)); |
| |
| pattern_stmt_info->pattern_stmt_p = true; |
| STMT_VINFO_RELATED_STMT (pattern_stmt_info) = orig_stmt_info; |
| STMT_VINFO_DEF_TYPE (pattern_stmt_info) |
| = STMT_VINFO_DEF_TYPE (orig_stmt_info); |
| if (!STMT_VINFO_VECTYPE (pattern_stmt_info)) |
| { |
| gcc_assert (VECTOR_BOOLEAN_TYPE_P (vectype) |
| == vect_use_mask_type_p (orig_stmt_info)); |
| STMT_VINFO_VECTYPE (pattern_stmt_info) = vectype; |
| pattern_stmt_info->mask_precision = orig_stmt_info->mask_precision; |
| } |
| return pattern_stmt_info; |
| } |
| |
| /* Set the pattern statement of ORIG_STMT_INFO to PATTERN_STMT. |
| Also set the vector type of PATTERN_STMT to VECTYPE, if it doesn't |
| have one already. */ |
| |
| static void |
| vect_set_pattern_stmt (gimple *pattern_stmt, stmt_vec_info orig_stmt_info, |
| tree vectype) |
| { |
| STMT_VINFO_IN_PATTERN_P (orig_stmt_info) = true; |
| STMT_VINFO_RELATED_STMT (orig_stmt_info) |
| = vect_init_pattern_stmt (pattern_stmt, orig_stmt_info, vectype); |
| } |
| |
| /* Add NEW_STMT to STMT_INFO's pattern definition statements. If VECTYPE |
| is nonnull, record that NEW_STMT's vector type is VECTYPE, which might |
| be different from the vector type of the final pattern statement. |
| If VECTYPE is a mask type, SCALAR_TYPE_FOR_MASK is the scalar type |
| from which it was derived. */ |
| |
| static inline void |
| append_pattern_def_seq (stmt_vec_info stmt_info, gimple *new_stmt, |
| tree vectype = NULL_TREE, |
| tree scalar_type_for_mask = NULL_TREE) |
| { |
| gcc_assert (!scalar_type_for_mask |
| == (!vectype || !VECTOR_BOOLEAN_TYPE_P (vectype))); |
| vec_info *vinfo = stmt_info->vinfo; |
| if (vectype) |
| { |
| stmt_vec_info new_stmt_info = vinfo->add_stmt (new_stmt); |
| STMT_VINFO_VECTYPE (new_stmt_info) = vectype; |
| if (scalar_type_for_mask) |
| new_stmt_info->mask_precision |
| = GET_MODE_BITSIZE (SCALAR_TYPE_MODE (scalar_type_for_mask)); |
| } |
| gimple_seq_add_stmt_without_update (&STMT_VINFO_PATTERN_DEF_SEQ (stmt_info), |
| new_stmt); |
| } |
| |
| /* The caller wants to perform new operations on vect_external variable |
| VAR, so that the result of the operations would also be vect_external. |
| Return the edge on which the operations can be performed, if one exists. |
| Return null if the operations should instead be treated as part of |
| the pattern that needs them. */ |
| |
| static edge |
| vect_get_external_def_edge (vec_info *vinfo, tree var) |
| { |
| edge e = NULL; |
| if (loop_vec_info loop_vinfo = dyn_cast <loop_vec_info> (vinfo)) |
| { |
| e = loop_preheader_edge (loop_vinfo->loop); |
| if (!SSA_NAME_IS_DEFAULT_DEF (var)) |
| { |
| basic_block bb = gimple_bb (SSA_NAME_DEF_STMT (var)); |
| if (bb == NULL |
| || !dominated_by_p (CDI_DOMINATORS, e->dest, bb)) |
| e = NULL; |
| } |
| } |
| return e; |
| } |
| |
| /* Return true if the target supports a vector version of CODE, |
| where CODE is known to map to a direct optab. ITYPE specifies |
| the type of (some of) the scalar inputs and OTYPE specifies the |
| type of the scalar result. |
| |
| If CODE allows the inputs and outputs to have different type |
| (such as for WIDEN_SUM_EXPR), it is the input mode rather |
| than the output mode that determines the appropriate target pattern. |
| Operand 0 of the target pattern then specifies the mode that the output |
| must have. |
| |
| When returning true, set *VECOTYPE_OUT to the vector version of OTYPE. |
| Also set *VECITYPE_OUT to the vector version of ITYPE if VECITYPE_OUT |
| is nonnull. */ |
| |
| static bool |
| vect_supportable_direct_optab_p (vec_info *vinfo, tree otype, tree_code code, |
| tree itype, tree *vecotype_out, |
| tree *vecitype_out = NULL) |
| { |
| tree vecitype = get_vectype_for_scalar_type (vinfo, itype); |
| if (!vecitype) |
| return false; |
| |
| tree vecotype = get_vectype_for_scalar_type (vinfo, otype); |
| if (!vecotype) |
| return false; |
| |
| optab optab = optab_for_tree_code (code, vecitype, optab_default); |
| if (!optab) |
| return false; |
| |
| insn_code icode = optab_handler (optab, TYPE_MODE (vecitype)); |
| if (icode == CODE_FOR_nothing |
| || insn_data[icode].operand[0].mode != TYPE_MODE (vecotype)) |
| return false; |
| |
| *vecotype_out = vecotype; |
| if (vecitype_out) |
| *vecitype_out = vecitype; |
| return true; |
| } |
| |
| /* Round bit precision PRECISION up to a full element. */ |
| |
| static unsigned int |
| vect_element_precision (unsigned int precision) |
| { |
| precision = 1 << ceil_log2 (precision); |
| return MAX (precision, BITS_PER_UNIT); |
| } |
| |
| /* If OP is defined by a statement that's being considered for vectorization, |
| return information about that statement, otherwise return NULL. */ |
| |
| static stmt_vec_info |
| vect_get_internal_def (vec_info *vinfo, tree op) |
| { |
| stmt_vec_info def_stmt_info = vinfo->lookup_def (op); |
| if (def_stmt_info |
| && STMT_VINFO_DEF_TYPE (def_stmt_info) == vect_internal_def) |
| return def_stmt_info; |
| return NULL; |
| } |
| |
| /* Check whether NAME, an ssa-name used in STMT_VINFO, |
| is a result of a type promotion, such that: |
| DEF_STMT: NAME = NOP (name0) |
| If CHECK_SIGN is TRUE, check that either both types are signed or both are |
| unsigned. */ |
| |
| static bool |
| type_conversion_p (tree name, stmt_vec_info stmt_vinfo, bool check_sign, |
| tree *orig_type, gimple **def_stmt, bool *promotion) |
| { |
| tree type = TREE_TYPE (name); |
| tree oprnd0; |
| enum vect_def_type dt; |
| |
| stmt_vec_info def_stmt_info; |
| if (!vect_is_simple_use (name, stmt_vinfo->vinfo, &dt, &def_stmt_info, |
| def_stmt)) |
| return false; |
| |
| if (dt != vect_internal_def |
| && dt != vect_external_def && dt != vect_constant_def) |
| return false; |
| |
| if (!*def_stmt) |
| return false; |
| |
| if (!is_gimple_assign (*def_stmt)) |
| return false; |
| |
| if (!CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (*def_stmt))) |
| return false; |
| |
| oprnd0 = gimple_assign_rhs1 (*def_stmt); |
| |
| *orig_type = TREE_TYPE (oprnd0); |
| if (!INTEGRAL_TYPE_P (type) || !INTEGRAL_TYPE_P (*orig_type) |
| || ((TYPE_UNSIGNED (type) != TYPE_UNSIGNED (*orig_type)) && check_sign)) |
| return false; |
| |
| if (TYPE_PRECISION (type) >= (TYPE_PRECISION (*orig_type) * 2)) |
| *promotion = true; |
| else |
| *promotion = false; |
| |
| if (!vect_is_simple_use (oprnd0, stmt_vinfo->vinfo, &dt)) |
| return false; |
| |
| return true; |
| } |
| |
| /* Holds information about an input operand after some sign changes |
| and type promotions have been peeled away. */ |
| class vect_unpromoted_value { |
| public: |
| vect_unpromoted_value (); |
| |
| void set_op (tree, vect_def_type, stmt_vec_info = NULL); |
| |
| /* The value obtained after peeling away zero or more casts. */ |
| tree op; |
| |
| /* The type of OP. */ |
| tree type; |
| |
| /* The definition type of OP. */ |
| vect_def_type dt; |
| |
| /* If OP is the result of peeling at least one cast, and if the cast |
| of OP itself is a vectorizable statement, CASTER identifies that |
| statement, otherwise it is null. */ |
| stmt_vec_info caster; |
| }; |
| |
| inline vect_unpromoted_value::vect_unpromoted_value () |
| : op (NULL_TREE), |
| type (NULL_TREE), |
| dt (vect_uninitialized_def), |
| caster (NULL) |
| { |
| } |
| |
| /* Set the operand to OP_IN, its definition type to DT_IN, and the |
| statement that casts it to CASTER_IN. */ |
| |
| inline void |
| vect_unpromoted_value::set_op (tree op_in, vect_def_type dt_in, |
| stmt_vec_info caster_in) |
| { |
| op = op_in; |
| type = TREE_TYPE (op); |
| dt = dt_in; |
| caster = caster_in; |
| } |
| |
| /* If OP is a vectorizable SSA name, strip a sequence of integer conversions |
| to reach some vectorizable inner operand OP', continuing as long as it |
| is possible to convert OP' back to OP using a possible sign change |
| followed by a possible promotion P. Return this OP', or null if OP is |
| not a vectorizable SSA name. If there is a promotion P, describe its |
| input in UNPROM, otherwise describe OP' in UNPROM. If SINGLE_USE_P |
| is nonnull, set *SINGLE_USE_P to false if any of the SSA names involved |
| have more than one user. |
| |
| A successful return means that it is possible to go from OP' to OP |
| via UNPROM. The cast from OP' to UNPROM is at most a sign change, |
| whereas the cast from UNPROM to OP might be a promotion, a sign |
| change, or a nop. |
| |
| E.g. say we have: |
| |
| signed short *ptr = ...; |
| signed short C = *ptr; |
| unsigned short B = (unsigned short) C; // sign change |
| signed int A = (signed int) B; // unsigned promotion |
| ...possible other uses of A... |
| unsigned int OP = (unsigned int) A; // sign change |
| |
| In this case it's possible to go directly from C to OP using: |
| |
| OP = (unsigned int) (unsigned short) C; |
| +------------+ +--------------+ |
| promotion sign change |
| |
| so OP' would be C. The input to the promotion is B, so UNPROM |
| would describe B. */ |
| |
| static tree |
| vect_look_through_possible_promotion (vec_info *vinfo, tree op, |
| vect_unpromoted_value *unprom, |
| bool *single_use_p = NULL) |
| { |
| tree res = NULL_TREE; |
| tree op_type = TREE_TYPE (op); |
| unsigned int orig_precision = TYPE_PRECISION (op_type); |
| unsigned int min_precision = orig_precision; |
| stmt_vec_info caster = NULL; |
| while (TREE_CODE (op) == SSA_NAME && INTEGRAL_TYPE_P (op_type)) |
| { |
| /* See whether OP is simple enough to vectorize. */ |
| stmt_vec_info def_stmt_info; |
| gimple *def_stmt; |
| vect_def_type dt; |
| if (!vect_is_simple_use (op, vinfo, &dt, &def_stmt_info, &def_stmt)) |
| break; |
| |
| /* If OP is the input of a demotion, skip over it to see whether |
| OP is itself the result of a promotion. If so, the combined |
| effect of the promotion and the demotion might fit the required |
| pattern, otherwise neither operation fits. |
| |
| This copes with cases such as the result of an arithmetic |
| operation being truncated before being stored, and where that |
| arithmetic operation has been recognized as an over-widened one. */ |
| if (TYPE_PRECISION (op_type) <= min_precision) |
| { |
| /* Use OP as the UNPROM described above if we haven't yet |
| found a promotion, or if using the new input preserves the |
| sign of the previous promotion. */ |
| if (!res |
| || TYPE_PRECISION (unprom->type) == orig_precision |
| || TYPE_SIGN (unprom->type) == TYPE_SIGN (op_type)) |
| { |
| unprom->set_op (op, dt, caster); |
| min_precision = TYPE_PRECISION (op_type); |
| } |
| /* Stop if we've already seen a promotion and if this |
| conversion does more than change the sign. */ |
| else if (TYPE_PRECISION (op_type) |
| != TYPE_PRECISION (unprom->type)) |
| break; |
| |
| /* The sequence now extends to OP. */ |
| res = op; |
| } |
| |
| /* See whether OP is defined by a cast. Record it as CASTER if |
| the cast is potentially vectorizable. */ |
| if (!def_stmt) |
| break; |
| caster = def_stmt_info; |
| |
| /* Ignore pattern statements, since we don't link uses for them. */ |
| if (caster |
| && single_use_p |
| && !STMT_VINFO_RELATED_STMT (caster) |
| && !has_single_use (res)) |
| *single_use_p = false; |
| |
| gassign *assign = dyn_cast <gassign *> (def_stmt); |
| if (!assign || !CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (def_stmt))) |
| break; |
| |
| /* Continue with the input to the cast. */ |
| op = gimple_assign_rhs1 (def_stmt); |
| op_type = TREE_TYPE (op); |
| } |
| return res; |
| } |
| |
| /* OP is an integer operand to an operation that returns TYPE, and we |
| want to treat the operation as a widening one. So far we can treat |
| it as widening from *COMMON_TYPE. |
| |
| Return true if OP is suitable for such a widening operation, |
| either widening from *COMMON_TYPE or from some supertype of it. |
| Update *COMMON_TYPE to the supertype in the latter case. |
| |
| SHIFT_P is true if OP is a shift amount. */ |
| |
| static bool |
| vect_joust_widened_integer (tree type, bool shift_p, tree op, |
| tree *common_type) |
| { |
| /* Calculate the minimum precision required by OP, without changing |
| the sign of either operand. */ |
| unsigned int precision; |
| if (shift_p) |
| { |
| if (!wi::leu_p (wi::to_widest (op), TYPE_PRECISION (type) / 2)) |
| return false; |
| precision = TREE_INT_CST_LOW (op); |
| } |
| else |
| { |
| precision = wi::min_precision (wi::to_widest (op), |
| TYPE_SIGN (*common_type)); |
| if (precision * 2 > TYPE_PRECISION (type)) |
| return false; |
| } |
| |
| /* If OP requires a wider type, switch to that type. The checks |
| above ensure that this is still narrower than the result. */ |
| precision = vect_element_precision (precision); |
| if (TYPE_PRECISION (*common_type) < precision) |
| *common_type = build_nonstandard_integer_type |
| (precision, TYPE_UNSIGNED (*common_type)); |
| return true; |
| } |
| |
| /* Return true if the common supertype of NEW_TYPE and *COMMON_TYPE |
| is narrower than type, storing the supertype in *COMMON_TYPE if so. */ |
| |
| static bool |
| vect_joust_widened_type (tree type, tree new_type, tree *common_type) |
| { |
| if (types_compatible_p (*common_type, new_type)) |
| return true; |
| |
| /* See if *COMMON_TYPE can hold all values of NEW_TYPE. */ |
| if ((TYPE_PRECISION (new_type) < TYPE_PRECISION (*common_type)) |
| && (TYPE_UNSIGNED (new_type) || !TYPE_UNSIGNED (*common_type))) |
| return true; |
| |
| /* See if NEW_TYPE can hold all values of *COMMON_TYPE. */ |
| if (TYPE_PRECISION (*common_type) < TYPE_PRECISION (new_type) |
| && (TYPE_UNSIGNED (*common_type) || !TYPE_UNSIGNED (new_type))) |
| { |
| *common_type = new_type; |
| return true; |
| } |
| |
| /* We have mismatched signs, with the signed type being |
| no wider than the unsigned type. In this case we need |
| a wider signed type. */ |
| unsigned int precision = MAX (TYPE_PRECISION (*common_type), |
| TYPE_PRECISION (new_type)); |
| precision *= 2; |
| if (precision * 2 > TYPE_PRECISION (type)) |
| return false; |
| |
| *common_type = build_nonstandard_integer_type (precision, false); |
| return true; |
| } |
| |
| /* Check whether STMT_INFO can be viewed as a tree of integer operations |
| in which each node either performs CODE or WIDENED_CODE, and where |
| each leaf operand is narrower than the result of STMT_INFO. MAX_NOPS |
| specifies the maximum number of leaf operands. SHIFT_P says whether |
| CODE and WIDENED_CODE are some sort of shift. |
| |
| If STMT_INFO is such a tree, return the number of leaf operands |
| and describe them in UNPROM[0] onwards. Also set *COMMON_TYPE |
| to a type that (a) is narrower than the result of STMT_INFO and |
| (b) can hold all leaf operand values. |
| |
| Return 0 if STMT_INFO isn't such a tree, or if no such COMMON_TYPE |
| exists. */ |
| |
| static unsigned int |
| vect_widened_op_tree (stmt_vec_info stmt_info, tree_code code, |
| tree_code widened_code, bool shift_p, |
| unsigned int max_nops, |
| vect_unpromoted_value *unprom, tree *common_type) |
| { |
| /* Check for an integer operation with the right code. */ |
| vec_info *vinfo = stmt_info->vinfo; |
| gassign *assign = dyn_cast <gassign *> (stmt_info->stmt); |
| if (!assign) |
| return 0; |
| |
| tree_code rhs_code = gimple_assign_rhs_code (assign); |
| if (rhs_code != code && rhs_code != widened_code) |
| return 0; |
| |
| tree type = gimple_expr_type (assign); |
| if (!INTEGRAL_TYPE_P (type)) |
| return 0; |
| |
| /* Assume that both operands will be leaf operands. */ |
| max_nops -= 2; |
| |
| /* Check the operands. */ |
| unsigned int next_op = 0; |
| for (unsigned int i = 0; i < 2; ++i) |
| { |
| vect_unpromoted_value *this_unprom = &unprom[next_op]; |
| unsigned int nops = 1; |
| tree op = gimple_op (assign, i + 1); |
| if (i == 1 && TREE_CODE (op) == INTEGER_CST) |
| { |
| /* We already have a common type from earlier operands. |
| Update it to account for OP. */ |
| this_unprom->set_op (op, vect_constant_def); |
| if (!vect_joust_widened_integer (type, shift_p, op, common_type)) |
| return 0; |
| } |
| else |
| { |
| /* Only allow shifts by constants. */ |
| if (shift_p && i == 1) |
| return 0; |
| |
| if (!vect_look_through_possible_promotion (stmt_info->vinfo, op, |
| this_unprom)) |
| return 0; |
| |
| if (TYPE_PRECISION (this_unprom->type) == TYPE_PRECISION (type)) |
| { |
| /* The operand isn't widened. If STMT_INFO has the code |
| for an unwidened operation, recursively check whether |
| this operand is a node of the tree. */ |
| if (rhs_code != code |
| || max_nops == 0 |
| || this_unprom->dt != vect_internal_def) |
| return 0; |
| |
| /* Give back the leaf slot allocated above now that we're |
| not treating this as a leaf operand. */ |
| max_nops += 1; |
| |
| /* Recursively process the definition of the operand. */ |
| stmt_vec_info def_stmt_info |
| = vinfo->lookup_def (this_unprom->op); |
| nops = vect_widened_op_tree (def_stmt_info, code, widened_code, |
| shift_p, max_nops, this_unprom, |
| common_type); |
| if (nops == 0) |
| return 0; |
| |
| max_nops -= nops; |
| } |
| else |
| { |
| /* Make sure that the operand is narrower than the result. */ |
| if (TYPE_PRECISION (this_unprom->type) * 2 |
| > TYPE_PRECISION (type)) |
| return 0; |
| |
| /* Update COMMON_TYPE for the new operand. */ |
| if (i == 0) |
| *common_type = this_unprom->type; |
| else if (!vect_joust_widened_type (type, this_unprom->type, |
| common_type)) |
| return 0; |
| } |
| } |
| next_op += nops; |
| } |
| return next_op; |
| } |
| |
| /* Helper to return a new temporary for pattern of TYPE for STMT. If STMT |
| is NULL, the caller must set SSA_NAME_DEF_STMT for the returned SSA var. */ |
| |
| static tree |
| vect_recog_temp_ssa_var (tree type, gimple *stmt) |
| { |
| return make_temp_ssa_name (type, stmt, "patt"); |
| } |
| |
| /* STMT2_INFO describes a type conversion that could be split into STMT1 |
| followed by a version of STMT2_INFO that takes NEW_RHS as its first |
| input. Try to do this using pattern statements, returning true on |
| success. */ |
| |
| static bool |
| vect_split_statement (stmt_vec_info stmt2_info, tree new_rhs, |
| gimple *stmt1, tree vectype) |
| { |
| vec_info *vinfo = stmt2_info->vinfo; |
| if (is_pattern_stmt_p (stmt2_info)) |
| { |
| /* STMT2_INFO is part of a pattern. Get the statement to which |
| the pattern is attached. */ |
| stmt_vec_info orig_stmt2_info = STMT_VINFO_RELATED_STMT (stmt2_info); |
| vect_init_pattern_stmt (stmt1, orig_stmt2_info, vectype); |
| |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, |
| "Splitting pattern statement: %G", stmt2_info->stmt); |
| |
| /* Since STMT2_INFO is a pattern statement, we can change it |
| in-situ without worrying about changing the code for the |
| containing block. */ |
| gimple_assign_set_rhs1 (stmt2_info->stmt, new_rhs); |
| |
| if (dump_enabled_p ()) |
| { |
| dump_printf_loc (MSG_NOTE, vect_location, "into: %G", stmt1); |
| dump_printf_loc (MSG_NOTE, vect_location, "and: %G", |
| stmt2_info->stmt); |
| } |
| |
| gimple_seq *def_seq = &STMT_VINFO_PATTERN_DEF_SEQ (orig_stmt2_info); |
| if (STMT_VINFO_RELATED_STMT (orig_stmt2_info) == stmt2_info) |
| /* STMT2_INFO is the actual pattern statement. Add STMT1 |
| to the end of the definition sequence. */ |
| gimple_seq_add_stmt_without_update (def_seq, stmt1); |
| else |
| { |
| /* STMT2_INFO belongs to the definition sequence. Insert STMT1 |
| before it. */ |
| gimple_stmt_iterator gsi = gsi_for_stmt (stmt2_info->stmt, def_seq); |
| gsi_insert_before_without_update (&gsi, stmt1, GSI_SAME_STMT); |
| } |
| return true; |
| } |
| else |
| { |
| /* STMT2_INFO doesn't yet have a pattern. Try to create a |
| two-statement pattern now. */ |
| gcc_assert (!STMT_VINFO_RELATED_STMT (stmt2_info)); |
| tree lhs_type = TREE_TYPE (gimple_get_lhs (stmt2_info->stmt)); |
| tree lhs_vectype = get_vectype_for_scalar_type (vinfo, lhs_type); |
| if (!lhs_vectype) |
| return false; |
| |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, |
| "Splitting statement: %G", stmt2_info->stmt); |
| |
| /* Add STMT1 as a singleton pattern definition sequence. */ |
| gimple_seq *def_seq = &STMT_VINFO_PATTERN_DEF_SEQ (stmt2_info); |
| vect_init_pattern_stmt (stmt1, stmt2_info, vectype); |
| gimple_seq_add_stmt_without_update (def_seq, stmt1); |
| |
| /* Build the second of the two pattern statements. */ |
| tree new_lhs = vect_recog_temp_ssa_var (lhs_type, NULL); |
| gassign *new_stmt2 = gimple_build_assign (new_lhs, NOP_EXPR, new_rhs); |
| vect_set_pattern_stmt (new_stmt2, stmt2_info, lhs_vectype); |
| |
| if (dump_enabled_p ()) |
| { |
| dump_printf_loc (MSG_NOTE, vect_location, |
| "into pattern statements: %G", stmt1); |
| dump_printf_loc (MSG_NOTE, vect_location, "and: %G", new_stmt2); |
| } |
| |
| return true; |
| } |
| } |
| |
| /* Convert UNPROM to TYPE and return the result, adding new statements |
| to STMT_INFO's pattern definition statements if no better way is |
| available. VECTYPE is the vector form of TYPE. */ |
| |
| static tree |
| vect_convert_input (stmt_vec_info stmt_info, tree type, |
| vect_unpromoted_value *unprom, tree vectype) |
| { |
| vec_info *vinfo = stmt_info->vinfo; |
| |
| /* Check for a no-op conversion. */ |
| if (types_compatible_p (type, TREE_TYPE (unprom->op))) |
| return unprom->op; |
| |
| /* Allow the caller to create constant vect_unpromoted_values. */ |
| if (TREE_CODE (unprom->op) == INTEGER_CST) |
| return wide_int_to_tree (type, wi::to_widest (unprom->op)); |
| |
| tree input = unprom->op; |
| if (unprom->caster) |
| { |
| tree lhs = gimple_get_lhs (unprom->caster->stmt); |
| tree lhs_type = TREE_TYPE (lhs); |
| |
| /* If the result of the existing cast is the right width, use it |
| instead of the source of the cast. */ |
| if (TYPE_PRECISION (lhs_type) == TYPE_PRECISION (type)) |
| input = lhs; |
| /* If the precision we want is between the source and result |
| precisions of the existing cast, try splitting the cast into |
| two and tapping into a mid-way point. */ |
| else if (TYPE_PRECISION (lhs_type) > TYPE_PRECISION (type) |
| && TYPE_PRECISION (type) > TYPE_PRECISION (unprom->type)) |
| { |
| /* In order to preserve the semantics of the original cast, |
| give the mid-way point the same signedness as the input value. |
| |
| It would be possible to use a signed type here instead if |
| TYPE is signed and UNPROM->TYPE is unsigned, but that would |
| make the sign of the midtype sensitive to the order in |
| which we process the statements, since the signedness of |
| TYPE is the signedness required by just one of possibly |
| many users. Also, unsigned promotions are usually as cheap |
| as or cheaper than signed ones, so it's better to keep an |
| unsigned promotion. */ |
| tree midtype = build_nonstandard_integer_type |
| (TYPE_PRECISION (type), TYPE_UNSIGNED (unprom->type)); |
| tree vec_midtype = get_vectype_for_scalar_type (vinfo, midtype); |
| if (vec_midtype) |
| { |
| input = vect_recog_temp_ssa_var (midtype, NULL); |
| gassign *new_stmt = gimple_build_assign (input, NOP_EXPR, |
| unprom->op); |
| if (!vect_split_statement (unprom->caster, input, new_stmt, |
| vec_midtype)) |
| append_pattern_def_seq (stmt_info, new_stmt, vec_midtype); |
| } |
| } |
| |
| /* See if we can reuse an existing result. */ |
| if (types_compatible_p (type, TREE_TYPE (input))) |
| return input; |
| } |
| |
| /* We need a new conversion statement. */ |
| tree new_op = vect_recog_temp_ssa_var (type, NULL); |
| gassign *new_stmt = gimple_build_assign (new_op, NOP_EXPR, input); |
| |
| /* If OP is an external value, see if we can insert the new statement |
| on an incoming edge. */ |
| if (input == unprom->op && unprom->dt == vect_external_def) |
| if (edge e = vect_get_external_def_edge (stmt_info->vinfo, input)) |
| { |
| basic_block new_bb = gsi_insert_on_edge_immediate (e, new_stmt); |
| gcc_assert (!new_bb); |
| return new_op; |
| } |
| |
| /* As a (common) last resort, add the statement to the pattern itself. */ |
| append_pattern_def_seq (stmt_info, new_stmt, vectype); |
| return new_op; |
| } |
| |
| /* Invoke vect_convert_input for N elements of UNPROM and store the |
| result in the corresponding elements of RESULT. */ |
| |
| static void |
| vect_convert_inputs (stmt_vec_info stmt_info, unsigned int n, |
| tree *result, tree type, vect_unpromoted_value *unprom, |
| tree vectype) |
| { |
| for (unsigned int i = 0; i < n; ++i) |
| { |
| unsigned int j; |
| for (j = 0; j < i; ++j) |
| if (unprom[j].op == unprom[i].op) |
| break; |
| if (j < i) |
| result[i] = result[j]; |
| else |
| result[i] = vect_convert_input (stmt_info, type, &unprom[i], vectype); |
| } |
| } |
| |
| /* The caller has created a (possibly empty) sequence of pattern definition |
| statements followed by a single statement PATTERN_STMT. Cast the result |
| of this final statement to TYPE. If a new statement is needed, add |
| PATTERN_STMT to the end of STMT_INFO's pattern definition statements |
| and return the new statement, otherwise return PATTERN_STMT as-is. |
| VECITYPE is the vector form of PATTERN_STMT's result type. */ |
| |
| static gimple * |
| vect_convert_output (stmt_vec_info stmt_info, tree type, gimple *pattern_stmt, |
| tree vecitype) |
| { |
| tree lhs = gimple_get_lhs (pattern_stmt); |
| if (!types_compatible_p (type, TREE_TYPE (lhs))) |
| { |
| append_pattern_def_seq (stmt_info, pattern_stmt, vecitype); |
| tree cast_var = vect_recog_temp_ssa_var (type, NULL); |
| pattern_stmt = gimple_build_assign (cast_var, NOP_EXPR, lhs); |
| } |
| return pattern_stmt; |
| } |
| |
| /* Return true if STMT_VINFO describes a reduction for which reassociation |
| is allowed. If STMT_INFO is part of a group, assume that it's part of |
| a reduction chain and optimistically assume that all statements |
| except the last allow reassociation. |
| Also require it to have code CODE and to be a reduction |
| in the outermost loop. When returning true, store the operands in |
| *OP0_OUT and *OP1_OUT. */ |
| |
| static bool |
| vect_reassociating_reduction_p (stmt_vec_info stmt_info, tree_code code, |
| tree *op0_out, tree *op1_out) |
| { |
| loop_vec_info loop_info = STMT_VINFO_LOOP_VINFO (stmt_info); |
| if (!loop_info) |
| return false; |
| |
| gassign *assign = dyn_cast <gassign *> (stmt_info->stmt); |
| if (!assign || gimple_assign_rhs_code (assign) != code) |
| return false; |
| |
| /* We don't allow changing the order of the computation in the inner-loop |
| when doing outer-loop vectorization. */ |
| class loop *loop = LOOP_VINFO_LOOP (loop_info); |
| if (loop && nested_in_vect_loop_p (loop, stmt_info)) |
| return false; |
| |
| if (STMT_VINFO_DEF_TYPE (stmt_info) == vect_reduction_def) |
| { |
| if (needs_fold_left_reduction_p (TREE_TYPE (gimple_assign_lhs (assign)), |
| code)) |
| return false; |
| } |
| else if (REDUC_GROUP_FIRST_ELEMENT (stmt_info) == NULL) |
| return false; |
| |
| *op0_out = gimple_assign_rhs1 (assign); |
| *op1_out = gimple_assign_rhs2 (assign); |
| if (commutative_tree_code (code) && STMT_VINFO_REDUC_IDX (stmt_info) == 0) |
| std::swap (*op0_out, *op1_out); |
| return true; |
| } |
| |
| /* Function vect_recog_dot_prod_pattern |
| |
| Try to find the following pattern: |
| |
| type x_t, y_t; |
| TYPE1 prod; |
| TYPE2 sum = init; |
| loop: |
| sum_0 = phi <init, sum_1> |
| S1 x_t = ... |
| S2 y_t = ... |
| S3 x_T = (TYPE1) x_t; |
| S4 y_T = (TYPE1) y_t; |
| S5 prod = x_T * y_T; |
| [S6 prod = (TYPE2) prod; #optional] |
| S7 sum_1 = prod + sum_0; |
| |
| where 'TYPE1' is exactly double the size of type 'type', and 'TYPE2' is the |
| same size of 'TYPE1' or bigger. This is a special case of a reduction |
| computation. |
| |
| Input: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins. In the |
| example, when this function is called with S7, the pattern {S3,S4,S5,S6,S7} |
| will be detected. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the sequence of |
| stmts that constitute the pattern. In this case it will be: |
| WIDEN_DOT_PRODUCT <x_t, y_t, sum_0> |
| |
| Note: The dot-prod idiom is a widening reduction pattern that is |
| vectorized without preserving all the intermediate results. It |
| produces only N/2 (widened) results (by summing up pairs of |
| intermediate results) rather than all N results. Therefore, we |
| cannot allow this pattern when we want to get all the results and in |
| the correct order (as is the case when this computation is in an |
| inner-loop nested in an outer-loop that us being vectorized). */ |
| |
| static gimple * |
| vect_recog_dot_prod_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| tree oprnd0, oprnd1; |
| gimple *last_stmt = stmt_vinfo->stmt; |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| tree type, half_type; |
| gimple *pattern_stmt; |
| tree var; |
| |
| /* Look for the following pattern |
| DX = (TYPE1) X; |
| DY = (TYPE1) Y; |
| DPROD = DX * DY; |
| DDPROD = (TYPE2) DPROD; |
| sum_1 = DDPROD + sum_0; |
| In which |
| - DX is double the size of X |
| - DY is double the size of Y |
| - DX, DY, DPROD all have the same type |
| - sum is the same size of DPROD or bigger |
| - sum has been recognized as a reduction variable. |
| |
| This is equivalent to: |
| DPROD = X w* Y; #widen mult |
| sum_1 = DPROD w+ sum_0; #widen summation |
| or |
| DPROD = X w* Y; #widen mult |
| sum_1 = DPROD + sum_0; #summation |
| */ |
| |
| /* Starting from LAST_STMT, follow the defs of its uses in search |
| of the above pattern. */ |
| |
| if (!vect_reassociating_reduction_p (stmt_vinfo, PLUS_EXPR, |
| &oprnd0, &oprnd1)) |
| return NULL; |
| |
| type = gimple_expr_type (last_stmt); |
| |
| vect_unpromoted_value unprom_mult; |
| oprnd0 = vect_look_through_possible_promotion (vinfo, oprnd0, &unprom_mult); |
| |
| /* So far so good. Since last_stmt was detected as a (summation) reduction, |
| we know that oprnd1 is the reduction variable (defined by a loop-header |
| phi), and oprnd0 is an ssa-name defined by a stmt in the loop body. |
| Left to check that oprnd0 is defined by a (widen_)mult_expr */ |
| if (!oprnd0) |
| return NULL; |
| |
| stmt_vec_info mult_vinfo = vect_get_internal_def (vinfo, oprnd0); |
| if (!mult_vinfo) |
| return NULL; |
| |
| /* FORNOW. Can continue analyzing the def-use chain when this stmt in a phi |
| inside the loop (in case we are analyzing an outer-loop). */ |
| vect_unpromoted_value unprom0[2]; |
| if (!vect_widened_op_tree (mult_vinfo, MULT_EXPR, WIDEN_MULT_EXPR, |
| false, 2, unprom0, &half_type)) |
| return NULL; |
| |
| /* If there are two widening operations, make sure they agree on |
| the sign of the extension. */ |
| if (TYPE_PRECISION (unprom_mult.type) != TYPE_PRECISION (type) |
| && TYPE_SIGN (unprom_mult.type) != TYPE_SIGN (half_type)) |
| return NULL; |
| |
| vect_pattern_detected ("vect_recog_dot_prod_pattern", last_stmt); |
| |
| tree half_vectype; |
| if (!vect_supportable_direct_optab_p (vinfo, type, DOT_PROD_EXPR, half_type, |
| type_out, &half_vectype)) |
| return NULL; |
| |
| /* Get the inputs in the appropriate types. */ |
| tree mult_oprnd[2]; |
| vect_convert_inputs (stmt_vinfo, 2, mult_oprnd, half_type, |
| unprom0, half_vectype); |
| |
| var = vect_recog_temp_ssa_var (type, NULL); |
| pattern_stmt = gimple_build_assign (var, DOT_PROD_EXPR, |
| mult_oprnd[0], mult_oprnd[1], oprnd1); |
| |
| return pattern_stmt; |
| } |
| |
| |
| /* Function vect_recog_sad_pattern |
| |
| Try to find the following Sum of Absolute Difference (SAD) pattern: |
| |
| type x_t, y_t; |
| signed TYPE1 diff, abs_diff; |
| TYPE2 sum = init; |
| loop: |
| sum_0 = phi <init, sum_1> |
| S1 x_t = ... |
| S2 y_t = ... |
| S3 x_T = (TYPE1) x_t; |
| S4 y_T = (TYPE1) y_t; |
| S5 diff = x_T - y_T; |
| S6 abs_diff = ABS_EXPR <diff>; |
| [S7 abs_diff = (TYPE2) abs_diff; #optional] |
| S8 sum_1 = abs_diff + sum_0; |
| |
| where 'TYPE1' is at least double the size of type 'type', and 'TYPE2' is the |
| same size of 'TYPE1' or bigger. This is a special case of a reduction |
| computation. |
| |
| Input: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins. In the |
| example, when this function is called with S8, the pattern |
| {S3,S4,S5,S6,S7,S8} will be detected. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the sequence of |
| stmts that constitute the pattern. In this case it will be: |
| SAD_EXPR <x_t, y_t, sum_0> |
| */ |
| |
| static gimple * |
| vect_recog_sad_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| gimple *last_stmt = stmt_vinfo->stmt; |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| tree half_type; |
| |
| /* Look for the following pattern |
| DX = (TYPE1) X; |
| DY = (TYPE1) Y; |
| DDIFF = DX - DY; |
| DAD = ABS_EXPR <DDIFF>; |
| DDPROD = (TYPE2) DPROD; |
| sum_1 = DAD + sum_0; |
| In which |
| - DX is at least double the size of X |
| - DY is at least double the size of Y |
| - DX, DY, DDIFF, DAD all have the same type |
| - sum is the same size of DAD or bigger |
| - sum has been recognized as a reduction variable. |
| |
| This is equivalent to: |
| DDIFF = X w- Y; #widen sub |
| DAD = ABS_EXPR <DDIFF>; |
| sum_1 = DAD w+ sum_0; #widen summation |
| or |
| DDIFF = X w- Y; #widen sub |
| DAD = ABS_EXPR <DDIFF>; |
| sum_1 = DAD + sum_0; #summation |
| */ |
| |
| /* Starting from LAST_STMT, follow the defs of its uses in search |
| of the above pattern. */ |
| |
| tree plus_oprnd0, plus_oprnd1; |
| if (!vect_reassociating_reduction_p (stmt_vinfo, PLUS_EXPR, |
| &plus_oprnd0, &plus_oprnd1)) |
| return NULL; |
| |
| tree sum_type = gimple_expr_type (last_stmt); |
| |
| /* Any non-truncating sequence of conversions is OK here, since |
| with a successful match, the result of the ABS(U) is known to fit |
| within the nonnegative range of the result type. (It cannot be the |
| negative of the minimum signed value due to the range of the widening |
| MINUS_EXPR.) */ |
| vect_unpromoted_value unprom_abs; |
| plus_oprnd0 = vect_look_through_possible_promotion (vinfo, plus_oprnd0, |
| &unprom_abs); |
| |
| /* So far so good. Since last_stmt was detected as a (summation) reduction, |
| we know that plus_oprnd1 is the reduction variable (defined by a loop-header |
| phi), and plus_oprnd0 is an ssa-name defined by a stmt in the loop body. |
| Then check that plus_oprnd0 is defined by an abs_expr. */ |
| |
| if (!plus_oprnd0) |
| return NULL; |
| |
| stmt_vec_info abs_stmt_vinfo = vect_get_internal_def (vinfo, plus_oprnd0); |
| if (!abs_stmt_vinfo) |
| return NULL; |
| |
| /* FORNOW. Can continue analyzing the def-use chain when this stmt in a phi |
| inside the loop (in case we are analyzing an outer-loop). */ |
| gassign *abs_stmt = dyn_cast <gassign *> (abs_stmt_vinfo->stmt); |
| if (!abs_stmt |
| || (gimple_assign_rhs_code (abs_stmt) != ABS_EXPR |
| && gimple_assign_rhs_code (abs_stmt) != ABSU_EXPR)) |
| return NULL; |
| |
| tree abs_oprnd = gimple_assign_rhs1 (abs_stmt); |
| tree abs_type = TREE_TYPE (abs_oprnd); |
| if (TYPE_UNSIGNED (abs_type)) |
| return NULL; |
| |
| /* Peel off conversions from the ABS input. This can involve sign |
| changes (e.g. from an unsigned subtraction to a signed ABS input) |
| or signed promotion, but it can't include unsigned promotion. |
| (Note that ABS of an unsigned promotion should have been folded |
| away before now anyway.) */ |
| vect_unpromoted_value unprom_diff; |
| abs_oprnd = vect_look_through_possible_promotion (vinfo, abs_oprnd, |
| &unprom_diff); |
| if (!abs_oprnd) |
| return NULL; |
| if (TYPE_PRECISION (unprom_diff.type) != TYPE_PRECISION (abs_type) |
| && TYPE_UNSIGNED (unprom_diff.type)) |
| return NULL; |
| |
| /* We then detect if the operand of abs_expr is defined by a minus_expr. */ |
| stmt_vec_info diff_stmt_vinfo = vect_get_internal_def (vinfo, abs_oprnd); |
| if (!diff_stmt_vinfo) |
| return NULL; |
| |
| /* FORNOW. Can continue analyzing the def-use chain when this stmt in a phi |
| inside the loop (in case we are analyzing an outer-loop). */ |
| vect_unpromoted_value unprom[2]; |
| if (!vect_widened_op_tree (diff_stmt_vinfo, MINUS_EXPR, MINUS_EXPR, |
| false, 2, unprom, &half_type)) |
| return NULL; |
| |
| vect_pattern_detected ("vect_recog_sad_pattern", last_stmt); |
| |
| tree half_vectype; |
| if (!vect_supportable_direct_optab_p (vinfo, sum_type, SAD_EXPR, half_type, |
| type_out, &half_vectype)) |
| return NULL; |
| |
| /* Get the inputs to the SAD_EXPR in the appropriate types. */ |
| tree sad_oprnd[2]; |
| vect_convert_inputs (stmt_vinfo, 2, sad_oprnd, half_type, |
| unprom, half_vectype); |
| |
| tree var = vect_recog_temp_ssa_var (sum_type, NULL); |
| gimple *pattern_stmt = gimple_build_assign (var, SAD_EXPR, sad_oprnd[0], |
| sad_oprnd[1], plus_oprnd1); |
| |
| return pattern_stmt; |
| } |
| |
| /* Recognize an operation that performs ORIG_CODE on widened inputs, |
| so that it can be treated as though it had the form: |
| |
| A_TYPE a; |
| B_TYPE b; |
| HALF_TYPE a_cast = (HALF_TYPE) a; // possible no-op |
| HALF_TYPE b_cast = (HALF_TYPE) b; // possible no-op |
| | RES_TYPE a_extend = (RES_TYPE) a_cast; // promotion from HALF_TYPE |
| | RES_TYPE b_extend = (RES_TYPE) b_cast; // promotion from HALF_TYPE |
| | RES_TYPE res = a_extend ORIG_CODE b_extend; |
| |
| Try to replace the pattern with: |
| |
| A_TYPE a; |
| B_TYPE b; |
| HALF_TYPE a_cast = (HALF_TYPE) a; // possible no-op |
| HALF_TYPE b_cast = (HALF_TYPE) b; // possible no-op |
| | EXT_TYPE ext = a_cast WIDE_CODE b_cast; |
| | RES_TYPE res = (EXT_TYPE) ext; // possible no-op |
| |
| where EXT_TYPE is wider than HALF_TYPE but has the same signedness. |
| |
| SHIFT_P is true if ORIG_CODE and WIDE_CODE are shifts. NAME is the |
| name of the pattern being matched, for dump purposes. */ |
| |
| static gimple * |
| vect_recog_widen_op_pattern (stmt_vec_info last_stmt_info, tree *type_out, |
| tree_code orig_code, tree_code wide_code, |
| bool shift_p, const char *name) |
| { |
| vec_info *vinfo = last_stmt_info->vinfo; |
| gimple *last_stmt = last_stmt_info->stmt; |
| |
| vect_unpromoted_value unprom[2]; |
| tree half_type; |
| if (!vect_widened_op_tree (last_stmt_info, orig_code, orig_code, |
| shift_p, 2, unprom, &half_type)) |
| return NULL; |
| |
| /* Pattern detected. */ |
| vect_pattern_detected (name, last_stmt); |
| |
| tree type = gimple_expr_type (last_stmt); |
| tree itype = type; |
| if (TYPE_PRECISION (type) != TYPE_PRECISION (half_type) * 2 |
| || TYPE_UNSIGNED (type) != TYPE_UNSIGNED (half_type)) |
| itype = build_nonstandard_integer_type (TYPE_PRECISION (half_type) * 2, |
| TYPE_UNSIGNED (half_type)); |
| |
| /* Check target support */ |
| tree vectype = get_vectype_for_scalar_type (vinfo, half_type); |
| tree vecitype = get_vectype_for_scalar_type (vinfo, itype); |
| enum tree_code dummy_code; |
| int dummy_int; |
| auto_vec<tree> dummy_vec; |
| if (!vectype |
| || !vecitype |
| || !supportable_widening_operation (wide_code, last_stmt_info, |
| vecitype, vectype, |
| &dummy_code, &dummy_code, |
| &dummy_int, &dummy_vec)) |
| return NULL; |
| |
| *type_out = get_vectype_for_scalar_type (vinfo, type); |
| if (!*type_out) |
| return NULL; |
| |
| tree oprnd[2]; |
| vect_convert_inputs (last_stmt_info, 2, oprnd, half_type, unprom, vectype); |
| |
| tree var = vect_recog_temp_ssa_var (itype, NULL); |
| gimple *pattern_stmt = gimple_build_assign (var, wide_code, |
| oprnd[0], oprnd[1]); |
| |
| return vect_convert_output (last_stmt_info, type, pattern_stmt, vecitype); |
| } |
| |
| /* Try to detect multiplication on widened inputs, converting MULT_EXPR |
| to WIDEN_MULT_EXPR. See vect_recog_widen_op_pattern for details. */ |
| |
| static gimple * |
| vect_recog_widen_mult_pattern (stmt_vec_info last_stmt_info, tree *type_out) |
| { |
| return vect_recog_widen_op_pattern (last_stmt_info, type_out, MULT_EXPR, |
| WIDEN_MULT_EXPR, false, |
| "vect_recog_widen_mult_pattern"); |
| } |
| |
| /* Function vect_recog_pow_pattern |
| |
| Try to find the following pattern: |
| |
| x = POW (y, N); |
| |
| with POW being one of pow, powf, powi, powif and N being |
| either 2 or 0.5. |
| |
| Input: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the sequence of |
| stmts that constitute the pattern. In this case it will be: |
| x = x * x |
| or |
| x = sqrt (x) |
| */ |
| |
| static gimple * |
| vect_recog_pow_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| gimple *last_stmt = stmt_vinfo->stmt; |
| tree base, exp; |
| gimple *stmt; |
| tree var; |
| |
| if (!is_gimple_call (last_stmt) || gimple_call_lhs (last_stmt) == NULL) |
| return NULL; |
| |
| switch (gimple_call_combined_fn (last_stmt)) |
| { |
| CASE_CFN_POW: |
| CASE_CFN_POWI: |
| break; |
| |
| default: |
| return NULL; |
| } |
| |
| base = gimple_call_arg (last_stmt, 0); |
| exp = gimple_call_arg (last_stmt, 1); |
| if (TREE_CODE (exp) != REAL_CST |
| && TREE_CODE (exp) != INTEGER_CST) |
| { |
| if (flag_unsafe_math_optimizations |
| && TREE_CODE (base) == REAL_CST |
| && gimple_call_builtin_p (last_stmt, BUILT_IN_NORMAL)) |
| { |
| combined_fn log_cfn; |
| built_in_function exp_bfn; |
| switch (DECL_FUNCTION_CODE (gimple_call_fndecl (last_stmt))) |
| { |
| case BUILT_IN_POW: |
| log_cfn = CFN_BUILT_IN_LOG; |
| exp_bfn = BUILT_IN_EXP; |
| break; |
| case BUILT_IN_POWF: |
| log_cfn = CFN_BUILT_IN_LOGF; |
| exp_bfn = BUILT_IN_EXPF; |
| break; |
| case BUILT_IN_POWL: |
| log_cfn = CFN_BUILT_IN_LOGL; |
| exp_bfn = BUILT_IN_EXPL; |
| break; |
| default: |
| return NULL; |
| } |
| tree logc = fold_const_call (log_cfn, TREE_TYPE (base), base); |
| tree exp_decl = builtin_decl_implicit (exp_bfn); |
| /* Optimize pow (C, x) as exp (log (C) * x). Normally match.pd |
| does that, but if C is a power of 2, we want to use |
| exp2 (log2 (C) * x) in the non-vectorized version, but for |
| vectorization we don't have vectorized exp2. */ |
| if (logc |
| && TREE_CODE (logc) == REAL_CST |
| && exp_decl |
| && lookup_attribute ("omp declare simd", |
| DECL_ATTRIBUTES (exp_decl))) |
| { |
| cgraph_node *node = cgraph_node::get_create (exp_decl); |
| if (node->simd_clones == NULL) |
| { |
| if (targetm.simd_clone.compute_vecsize_and_simdlen == NULL |
| || node->definition) |
| return NULL; |
| expand_simd_clones (node); |
| if (node->simd_clones == NULL) |
| return NULL; |
| } |
| *type_out = get_vectype_for_scalar_type (vinfo, TREE_TYPE (base)); |
| if (!*type_out) |
| return NULL; |
| tree def = vect_recog_temp_ssa_var (TREE_TYPE (base), NULL); |
| gimple *g = gimple_build_assign (def, MULT_EXPR, exp, logc); |
| append_pattern_def_seq (stmt_vinfo, g); |
| tree res = vect_recog_temp_ssa_var (TREE_TYPE (base), NULL); |
| g = gimple_build_call (exp_decl, 1, def); |
| gimple_call_set_lhs (g, res); |
| return g; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| /* We now have a pow or powi builtin function call with a constant |
| exponent. */ |
| |
| /* Catch squaring. */ |
| if ((tree_fits_shwi_p (exp) |
| && tree_to_shwi (exp) == 2) |
| || (TREE_CODE (exp) == REAL_CST |
| && real_equal (&TREE_REAL_CST (exp), &dconst2))) |
| { |
| if (!vect_supportable_direct_optab_p (vinfo, TREE_TYPE (base), MULT_EXPR, |
| TREE_TYPE (base), type_out)) |
| return NULL; |
| |
| var = vect_recog_temp_ssa_var (TREE_TYPE (base), NULL); |
| stmt = gimple_build_assign (var, MULT_EXPR, base, base); |
| return stmt; |
| } |
| |
| /* Catch square root. */ |
| if (TREE_CODE (exp) == REAL_CST |
| && real_equal (&TREE_REAL_CST (exp), &dconsthalf)) |
| { |
| *type_out = get_vectype_for_scalar_type (vinfo, TREE_TYPE (base)); |
| if (*type_out |
| && direct_internal_fn_supported_p (IFN_SQRT, *type_out, |
| OPTIMIZE_FOR_SPEED)) |
| { |
| gcall *stmt = gimple_build_call_internal (IFN_SQRT, 1, base); |
| var = vect_recog_temp_ssa_var (TREE_TYPE (base), stmt); |
| gimple_call_set_lhs (stmt, var); |
| gimple_call_set_nothrow (stmt, true); |
| return stmt; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| |
| /* Function vect_recog_widen_sum_pattern |
| |
| Try to find the following pattern: |
| |
| type x_t; |
| TYPE x_T, sum = init; |
| loop: |
| sum_0 = phi <init, sum_1> |
| S1 x_t = *p; |
| S2 x_T = (TYPE) x_t; |
| S3 sum_1 = x_T + sum_0; |
| |
| where type 'TYPE' is at least double the size of type 'type', i.e - we're |
| summing elements of type 'type' into an accumulator of type 'TYPE'. This is |
| a special case of a reduction computation. |
| |
| Input: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins. In the example, |
| when this function is called with S3, the pattern {S2,S3} will be detected. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the sequence of |
| stmts that constitute the pattern. In this case it will be: |
| WIDEN_SUM <x_t, sum_0> |
| |
| Note: The widening-sum idiom is a widening reduction pattern that is |
| vectorized without preserving all the intermediate results. It |
| produces only N/2 (widened) results (by summing up pairs of |
| intermediate results) rather than all N results. Therefore, we |
| cannot allow this pattern when we want to get all the results and in |
| the correct order (as is the case when this computation is in an |
| inner-loop nested in an outer-loop that us being vectorized). */ |
| |
| static gimple * |
| vect_recog_widen_sum_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| gimple *last_stmt = stmt_vinfo->stmt; |
| tree oprnd0, oprnd1; |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| tree type; |
| gimple *pattern_stmt; |
| tree var; |
| |
| /* Look for the following pattern |
| DX = (TYPE) X; |
| sum_1 = DX + sum_0; |
| In which DX is at least double the size of X, and sum_1 has been |
| recognized as a reduction variable. |
| */ |
| |
| /* Starting from LAST_STMT, follow the defs of its uses in search |
| of the above pattern. */ |
| |
| if (!vect_reassociating_reduction_p (stmt_vinfo, PLUS_EXPR, |
| &oprnd0, &oprnd1)) |
| return NULL; |
| |
| type = gimple_expr_type (last_stmt); |
| |
| /* So far so good. Since last_stmt was detected as a (summation) reduction, |
| we know that oprnd1 is the reduction variable (defined by a loop-header |
| phi), and oprnd0 is an ssa-name defined by a stmt in the loop body. |
| Left to check that oprnd0 is defined by a cast from type 'type' to type |
| 'TYPE'. */ |
| |
| vect_unpromoted_value unprom0; |
| if (!vect_look_through_possible_promotion (vinfo, oprnd0, &unprom0) |
| || TYPE_PRECISION (unprom0.type) * 2 > TYPE_PRECISION (type)) |
| return NULL; |
| |
| vect_pattern_detected ("vect_recog_widen_sum_pattern", last_stmt); |
| |
| if (!vect_supportable_direct_optab_p (vinfo, type, WIDEN_SUM_EXPR, |
| unprom0.type, type_out)) |
| return NULL; |
| |
| var = vect_recog_temp_ssa_var (type, NULL); |
| pattern_stmt = gimple_build_assign (var, WIDEN_SUM_EXPR, unprom0.op, oprnd1); |
| |
| return pattern_stmt; |
| } |
| |
| /* Recognize cases in which an operation is performed in one type WTYPE |
| but could be done more efficiently in a narrower type NTYPE. For example, |
| if we have: |
| |
| ATYPE a; // narrower than NTYPE |
| BTYPE b; // narrower than NTYPE |
| WTYPE aw = (WTYPE) a; |
| WTYPE bw = (WTYPE) b; |
| WTYPE res = aw + bw; // only uses of aw and bw |
| |
| then it would be more efficient to do: |
| |
| NTYPE an = (NTYPE) a; |
| NTYPE bn = (NTYPE) b; |
| NTYPE resn = an + bn; |
| WTYPE res = (WTYPE) resn; |
| |
| Other situations include things like: |
| |
| ATYPE a; // NTYPE or narrower |
| WTYPE aw = (WTYPE) a; |
| WTYPE res = aw + b; |
| |
| when only "(NTYPE) res" is significant. In that case it's more efficient |
| to truncate "b" and do the operation on NTYPE instead: |
| |
| NTYPE an = (NTYPE) a; |
| NTYPE bn = (NTYPE) b; // truncation |
| NTYPE resn = an + bn; |
| WTYPE res = (WTYPE) resn; |
| |
| All users of "res" should then use "resn" instead, making the final |
| statement dead (not marked as relevant). The final statement is still |
| needed to maintain the type correctness of the IR. |
| |
| vect_determine_precisions has already determined the minimum |
| precison of the operation and the minimum precision required |
| by users of the result. */ |
| |
| static gimple * |
| vect_recog_over_widening_pattern (stmt_vec_info last_stmt_info, tree *type_out) |
| { |
| gassign *last_stmt = dyn_cast <gassign *> (last_stmt_info->stmt); |
| if (!last_stmt) |
| return NULL; |
| |
| /* See whether we have found that this operation can be done on a |
| narrower type without changing its semantics. */ |
| unsigned int new_precision = last_stmt_info->operation_precision; |
| if (!new_precision) |
| return NULL; |
| |
| vec_info *vinfo = last_stmt_info->vinfo; |
| tree lhs = gimple_assign_lhs (last_stmt); |
| tree type = TREE_TYPE (lhs); |
| tree_code code = gimple_assign_rhs_code (last_stmt); |
| |
| /* Keep the first operand of a COND_EXPR as-is: only the other two |
| operands are interesting. */ |
| unsigned int first_op = (code == COND_EXPR ? 2 : 1); |
| |
| /* Check the operands. */ |
| unsigned int nops = gimple_num_ops (last_stmt) - first_op; |
| auto_vec <vect_unpromoted_value, 3> unprom (nops); |
| unprom.quick_grow (nops); |
| unsigned int min_precision = 0; |
| bool single_use_p = false; |
| for (unsigned int i = 0; i < nops; ++i) |
| { |
| tree op = gimple_op (last_stmt, first_op + i); |
| if (TREE_CODE (op) == INTEGER_CST) |
| unprom[i].set_op (op, vect_constant_def); |
| else if (TREE_CODE (op) == SSA_NAME) |
| { |
| bool op_single_use_p = true; |
| if (!vect_look_through_possible_promotion (vinfo, op, &unprom[i], |
| &op_single_use_p)) |
| return NULL; |
| /* If: |
| |
| (1) N bits of the result are needed; |
| (2) all inputs are widened from M<N bits; and |
| (3) one operand OP is a single-use SSA name |
| |
| we can shift the M->N widening from OP to the output |
| without changing the number or type of extensions involved. |
| This then reduces the number of copies of STMT_INFO. |
| |
| If instead of (3) more than one operand is a single-use SSA name, |
| shifting the extension to the output is even more of a win. |
| |
| If instead: |
| |
| (1) N bits of the result are needed; |
| (2) one operand OP2 is widened from M2<N bits; |
| (3) another operand OP1 is widened from M1<M2 bits; and |
| (4) both OP1 and OP2 are single-use |
| |
| the choice is between: |
| |
| (a) truncating OP2 to M1, doing the operation on M1, |
| and then widening the result to N |
| |
| (b) widening OP1 to M2, doing the operation on M2, and then |
| widening the result to N |
| |
| Both shift the M2->N widening of the inputs to the output. |
| (a) additionally shifts the M1->M2 widening to the output; |
| it requires fewer copies of STMT_INFO but requires an extra |
| M2->M1 truncation. |
| |
| Which is better will depend on the complexity and cost of |
| STMT_INFO, which is hard to predict at this stage. However, |
| a clear tie-breaker in favor of (b) is the fact that the |
| truncation in (a) increases the length of the operation chain. |
| |
| If instead of (4) only one of OP1 or OP2 is single-use, |
| (b) is still a win over doing the operation in N bits: |
| it still shifts the M2->N widening on the single-use operand |
| to the output and reduces the number of STMT_INFO copies. |
| |
| If neither operand is single-use then operating on fewer than |
| N bits might lead to more extensions overall. Whether it does |
| or not depends on global information about the vectorization |
| region, and whether that's a good trade-off would again |
| depend on the complexity and cost of the statements involved, |
| as well as things like register pressure that are not normally |
| modelled at this stage. We therefore ignore these cases |
| and just optimize the clear single-use wins above. |
| |
| Thus we take the maximum precision of the unpromoted operands |
| and record whether any operand is single-use. */ |
| if (unprom[i].dt == vect_internal_def) |
| { |
| min_precision = MAX (min_precision, |
| TYPE_PRECISION (unprom[i].type)); |
| single_use_p |= op_single_use_p; |
| } |
| } |
| } |
| |
| /* Although the operation could be done in operation_precision, we have |
| to balance that against introducing extra truncations or extensions. |
| Calculate the minimum precision that can be handled efficiently. |
| |
| The loop above determined that the operation could be handled |
| efficiently in MIN_PRECISION if SINGLE_USE_P; this would shift an |
| extension from the inputs to the output without introducing more |
| instructions, and would reduce the number of instructions required |
| for STMT_INFO itself. |
| |
| vect_determine_precisions has also determined that the result only |
| needs min_output_precision bits. Truncating by a factor of N times |
| requires a tree of N - 1 instructions, so if TYPE is N times wider |
| than min_output_precision, doing the operation in TYPE and truncating |
| the result requires N + (N - 1) = 2N - 1 instructions per output vector. |
| In contrast: |
| |
| - truncating the input to a unary operation and doing the operation |
| in the new type requires at most N - 1 + 1 = N instructions per |
| output vector |
| |
| - doing the same for a binary operation requires at most |
| (N - 1) * 2 + 1 = 2N - 1 instructions per output vector |
| |
| Both unary and binary operations require fewer instructions than |
| this if the operands were extended from a suitable truncated form. |
| Thus there is usually nothing to lose by doing operations in |
| min_output_precision bits, but there can be something to gain. */ |
| if (!single_use_p) |
| min_precision = last_stmt_info->min_output_precision; |
| else |
| min_precision = MIN (min_precision, last_stmt_info->min_output_precision); |
| |
| /* Apply the minimum efficient precision we just calculated. */ |
| if (new_precision < min_precision) |
| new_precision = min_precision; |
| new_precision = vect_element_precision (new_precision); |
| if (new_precision >= TYPE_PRECISION (type)) |
| return NULL; |
| |
| vect_pattern_detected ("vect_recog_over_widening_pattern", last_stmt); |
| |
| *type_out = get_vectype_for_scalar_type (vinfo, type); |
| if (!*type_out) |
| return NULL; |
| |
| /* We've found a viable pattern. Get the new type of the operation. */ |
| bool unsigned_p = (last_stmt_info->operation_sign == UNSIGNED); |
| tree new_type = build_nonstandard_integer_type (new_precision, unsigned_p); |
| |
| /* If we're truncating an operation, we need to make sure that we |
| don't introduce new undefined overflow. The codes tested here are |
| a subset of those accepted by vect_truncatable_operation_p. */ |
| tree op_type = new_type; |
| if (TYPE_OVERFLOW_UNDEFINED (new_type) |
| && (code == PLUS_EXPR || code == MINUS_EXPR || code == MULT_EXPR)) |
| op_type = build_nonstandard_integer_type (new_precision, true); |
| |
| /* We specifically don't check here whether the target supports the |
| new operation, since it might be something that a later pattern |
| wants to rewrite anyway. If targets have a minimum element size |
| for some optabs, we should pattern-match smaller ops to larger ops |
| where beneficial. */ |
| tree new_vectype = get_vectype_for_scalar_type (vinfo, new_type); |
| tree op_vectype = get_vectype_for_scalar_type (vinfo, op_type); |
| if (!new_vectype || !op_vectype) |
| return NULL; |
| |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, "demoting %T to %T\n", |
| type, new_type); |
| |
| /* Calculate the rhs operands for an operation on OP_TYPE. */ |
| tree ops[3] = {}; |
| for (unsigned int i = 1; i < first_op; ++i) |
| ops[i - 1] = gimple_op (last_stmt, i); |
| vect_convert_inputs (last_stmt_info, nops, &ops[first_op - 1], |
| op_type, &unprom[0], op_vectype); |
| |
| /* Use the operation to produce a result of type OP_TYPE. */ |
| tree new_var = vect_recog_temp_ssa_var (op_type, NULL); |
| gimple *pattern_stmt = gimple_build_assign (new_var, code, |
| ops[0], ops[1], ops[2]); |
| gimple_set_location (pattern_stmt, gimple_location (last_stmt)); |
| |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, |
| "created pattern stmt: %G", pattern_stmt); |
| |
| /* Convert back to the original signedness, if OP_TYPE is different |
| from NEW_TYPE. */ |
| if (op_type != new_type) |
| pattern_stmt = vect_convert_output (last_stmt_info, new_type, |
| pattern_stmt, op_vectype); |
| |
| /* Promote the result to the original type. */ |
| pattern_stmt = vect_convert_output (last_stmt_info, type, |
| pattern_stmt, new_vectype); |
| |
| return pattern_stmt; |
| } |
| |
| /* Recognize the following patterns: |
| |
| ATYPE a; // narrower than TYPE |
| BTYPE b; // narrower than TYPE |
| |
| 1) Multiply high with scaling |
| TYPE res = ((TYPE) a * (TYPE) b) >> c; |
| 2) ... or also with rounding |
| TYPE res = (((TYPE) a * (TYPE) b) >> d + 1) >> 1; |
| |
| where only the bottom half of res is used. */ |
| |
| static gimple * |
| vect_recog_mulhs_pattern (stmt_vec_info last_stmt_info, tree *type_out) |
| { |
| /* Check for a right shift. */ |
| gassign *last_stmt = dyn_cast <gassign *> (last_stmt_info->stmt); |
| if (!last_stmt |
| || gimple_assign_rhs_code (last_stmt) != RSHIFT_EXPR) |
| return NULL; |
| vec_info *vinfo = last_stmt_info->vinfo; |
| |
| /* Check that the shift result is wider than the users of the |
| result need (i.e. that narrowing would be a natural choice). */ |
| tree lhs_type = TREE_TYPE (gimple_assign_lhs (last_stmt)); |
| unsigned int target_precision |
| = vect_element_precision (last_stmt_info->min_output_precision); |
| if (!INTEGRAL_TYPE_P (lhs_type) |
| || target_precision >= TYPE_PRECISION (lhs_type)) |
| return NULL; |
| |
| /* Look through any change in sign on the outer shift input. */ |
| vect_unpromoted_value unprom_rshift_input; |
| tree rshift_input = vect_look_through_possible_promotion |
| (vinfo, gimple_assign_rhs1 (last_stmt), &unprom_rshift_input); |
| if (!rshift_input |
| || TYPE_PRECISION (TREE_TYPE (rshift_input)) |
| != TYPE_PRECISION (lhs_type)) |
| return NULL; |
| |
| /* Get the definition of the shift input. */ |
| stmt_vec_info rshift_input_stmt_info |
| = vect_get_internal_def (vinfo, rshift_input); |
| if (!rshift_input_stmt_info) |
| return NULL; |
| gassign *rshift_input_stmt |
| = dyn_cast <gassign *> (rshift_input_stmt_info->stmt); |
| if (!rshift_input_stmt) |
| return NULL; |
| |
| stmt_vec_info mulh_stmt_info; |
| tree scale_term; |
| internal_fn ifn; |
| unsigned int expect_offset; |
| |
| /* Check for the presence of the rounding term. */ |
| if (gimple_assign_rhs_code (rshift_input_stmt) == PLUS_EXPR) |
| { |
| /* Check that the outer shift was by 1. */ |
| if (!integer_onep (gimple_assign_rhs2 (last_stmt))) |
| return NULL; |
| |
| /* Check that the second operand of the PLUS_EXPR is 1. */ |
| if (!integer_onep (gimple_assign_rhs2 (rshift_input_stmt))) |
| return NULL; |
| |
| /* Look through any change in sign on the addition input. */ |
| vect_unpromoted_value unprom_plus_input; |
| tree plus_input = vect_look_through_possible_promotion |
| (vinfo, gimple_assign_rhs1 (rshift_input_stmt), &unprom_plus_input); |
| if (!plus_input |
| || TYPE_PRECISION (TREE_TYPE (plus_input)) |
| != TYPE_PRECISION (TREE_TYPE (rshift_input))) |
| return NULL; |
| |
| /* Get the definition of the multiply-high-scale part. */ |
| stmt_vec_info plus_input_stmt_info |
| = vect_get_internal_def (vinfo, plus_input); |
| if (!plus_input_stmt_info) |
| return NULL; |
| gassign *plus_input_stmt |
| = dyn_cast <gassign *> (plus_input_stmt_info->stmt); |
| if (!plus_input_stmt |
| || gimple_assign_rhs_code (plus_input_stmt) != RSHIFT_EXPR) |
| return NULL; |
| |
| /* Look through any change in sign on the scaling input. */ |
| vect_unpromoted_value unprom_scale_input; |
| tree scale_input = vect_look_through_possible_promotion |
| (vinfo, gimple_assign_rhs1 (plus_input_stmt), &unprom_scale_input); |
| if (!scale_input |
| || TYPE_PRECISION (TREE_TYPE (scale_input)) |
| != TYPE_PRECISION (TREE_TYPE (plus_input))) |
| return NULL; |
| |
| /* Get the definition of the multiply-high part. */ |
| mulh_stmt_info = vect_get_internal_def (vinfo, scale_input); |
| if (!mulh_stmt_info) |
| return NULL; |
| |
| /* Get the scaling term. */ |
| scale_term = gimple_assign_rhs2 (plus_input_stmt); |
| |
| expect_offset = target_precision + 2; |
| ifn = IFN_MULHRS; |
| } |
| else |
| { |
| mulh_stmt_info = rshift_input_stmt_info; |
| scale_term = gimple_assign_rhs2 (last_stmt); |
| |
| expect_offset = target_precision + 1; |
| ifn = IFN_MULHS; |
| } |
| |
| /* Check that the scaling factor is correct. */ |
| if (TREE_CODE (scale_term) != INTEGER_CST |
| || wi::to_widest (scale_term) + expect_offset |
| != TYPE_PRECISION (lhs_type)) |
| return NULL; |
| |
| /* Check whether the scaling input term can be seen as two widened |
| inputs multiplied together. */ |
| vect_unpromoted_value unprom_mult[2]; |
| tree new_type; |
| unsigned int nops |
| = vect_widened_op_tree (mulh_stmt_info, MULT_EXPR, WIDEN_MULT_EXPR, |
| false, 2, unprom_mult, &new_type); |
| if (nops != 2) |
| return NULL; |
| |
| vect_pattern_detected ("vect_recog_mulhs_pattern", last_stmt); |
| |
| /* Adjust output precision. */ |
| if (TYPE_PRECISION (new_type) < target_precision) |
| new_type = build_nonstandard_integer_type |
| (target_precision, TYPE_UNSIGNED (new_type)); |
| |
| /* Check for target support. */ |
| tree new_vectype = get_vectype_for_scalar_type (vinfo, new_type); |
| if (!new_vectype |
| || !direct_internal_fn_supported_p |
| (ifn, new_vectype, OPTIMIZE_FOR_SPEED)) |
| return NULL; |
| |
| /* The IR requires a valid vector type for the cast result, even though |
| it's likely to be discarded. */ |
| *type_out = get_vectype_for_scalar_type (vinfo, lhs_type); |
| if (!*type_out) |
| return NULL; |
| |
| /* Generate the IFN_MULHRS call. */ |
| tree new_var = vect_recog_temp_ssa_var (new_type, NULL); |
| tree new_ops[2]; |
| vect_convert_inputs (last_stmt_info, 2, new_ops, new_type, |
| unprom_mult, new_vectype); |
| gcall *mulhrs_stmt |
| = gimple_build_call_internal (ifn, 2, new_ops[0], new_ops[1]); |
| gimple_call_set_lhs (mulhrs_stmt, new_var); |
| gimple_set_location (mulhrs_stmt, gimple_location (last_stmt)); |
| |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, |
| "created pattern stmt: %G", mulhrs_stmt); |
| |
| return vect_convert_output (last_stmt_info, lhs_type, |
| mulhrs_stmt, new_vectype); |
| } |
| |
| /* Recognize the patterns: |
| |
| ATYPE a; // narrower than TYPE |
| BTYPE b; // narrower than TYPE |
| (1) TYPE avg = ((TYPE) a + (TYPE) b) >> 1; |
| or (2) TYPE avg = ((TYPE) a + (TYPE) b + 1) >> 1; |
| |
| where only the bottom half of avg is used. Try to transform them into: |
| |
| (1) NTYPE avg' = .AVG_FLOOR ((NTYPE) a, (NTYPE) b); |
| or (2) NTYPE avg' = .AVG_CEIL ((NTYPE) a, (NTYPE) b); |
| |
| followed by: |
| |
| TYPE avg = (TYPE) avg'; |
| |
| where NTYPE is no wider than half of TYPE. Since only the bottom half |
| of avg is used, all or part of the cast of avg' should become redundant. |
| |
| If there is no target support available, generate code to distribute rshift |
| over plus and add a carry. */ |
| |
| static gimple * |
| vect_recog_average_pattern (stmt_vec_info last_stmt_info, tree *type_out) |
| { |
| /* Check for a shift right by one bit. */ |
| gassign *last_stmt = dyn_cast <gassign *> (last_stmt_info->stmt); |
| vec_info *vinfo = last_stmt_info->vinfo; |
| if (!last_stmt |
| || gimple_assign_rhs_code (last_stmt) != RSHIFT_EXPR |
| || !integer_onep (gimple_assign_rhs2 (last_stmt))) |
| return NULL; |
| |
| /* Check that the shift result is wider than the users of the |
| result need (i.e. that narrowing would be a natural choice). */ |
| tree lhs = gimple_assign_lhs (last_stmt); |
| tree type = TREE_TYPE (lhs); |
| unsigned int target_precision |
| = vect_element_precision (last_stmt_info->min_output_precision); |
| if (!INTEGRAL_TYPE_P (type) || target_precision >= TYPE_PRECISION (type)) |
| return NULL; |
| |
| /* Look through any change in sign on the shift input. */ |
| tree rshift_rhs = gimple_assign_rhs1 (last_stmt); |
| vect_unpromoted_value unprom_plus; |
| rshift_rhs = vect_look_through_possible_promotion (vinfo, rshift_rhs, |
| &unprom_plus); |
| if (!rshift_rhs |
| || TYPE_PRECISION (TREE_TYPE (rshift_rhs)) != TYPE_PRECISION (type)) |
| return NULL; |
| |
| /* Get the definition of the shift input. */ |
| stmt_vec_info plus_stmt_info = vect_get_internal_def (vinfo, rshift_rhs); |
| if (!plus_stmt_info) |
| return NULL; |
| |
| /* Check whether the shift input can be seen as a tree of additions on |
| 2 or 3 widened inputs. |
| |
| Note that the pattern should be a win even if the result of one or |
| more additions is reused elsewhere: if the pattern matches, we'd be |
| replacing 2N RSHIFT_EXPRs and N VEC_PACK_*s with N IFN_AVG_*s. */ |
| internal_fn ifn = IFN_AVG_FLOOR; |
| vect_unpromoted_value unprom[3]; |
| tree new_type; |
| unsigned int nops = vect_widened_op_tree (plus_stmt_info, PLUS_EXPR, |
| PLUS_EXPR, false, 3, |
| unprom, &new_type); |
| if (nops == 0) |
| return NULL; |
| if (nops == 3) |
| { |
| /* Check that one operand is 1. */ |
| unsigned int i; |
| for (i = 0; i < 3; ++i) |
| if (integer_onep (unprom[i].op)) |
| break; |
| if (i == 3) |
| return NULL; |
| /* Throw away the 1 operand and keep the other two. */ |
| if (i < 2) |
| unprom[i] = unprom[2]; |
| ifn = IFN_AVG_CEIL; |
| } |
| |
| vect_pattern_detected ("vect_recog_average_pattern", last_stmt); |
| |
| /* We know that: |
| |
| (a) the operation can be viewed as: |
| |
| TYPE widened0 = (TYPE) UNPROM[0]; |
| TYPE widened1 = (TYPE) UNPROM[1]; |
| TYPE tmp1 = widened0 + widened1 {+ 1}; |
| TYPE tmp2 = tmp1 >> 1; // LAST_STMT_INFO |
| |
| (b) the first two statements are equivalent to: |
| |
| TYPE widened0 = (TYPE) (NEW_TYPE) UNPROM[0]; |
| TYPE widened1 = (TYPE) (NEW_TYPE) UNPROM[1]; |
| |
| (c) vect_recog_over_widening_pattern has already tried to narrow TYPE |
| where sensible; |
| |
| (d) all the operations can be performed correctly at twice the width of |
| NEW_TYPE, due to the nature of the average operation; and |
| |
| (e) users of the result of the right shift need only TARGET_PRECISION |
| bits, where TARGET_PRECISION is no more than half of TYPE's |
| precision. |
| |
| Under these circumstances, the only situation in which NEW_TYPE |
| could be narrower than TARGET_PRECISION is if widened0, widened1 |
| and an addition result are all used more than once. Thus we can |
| treat any widening of UNPROM[0] and UNPROM[1] to TARGET_PRECISION |
| as "free", whereas widening the result of the average instruction |
| from NEW_TYPE to TARGET_PRECISION would be a new operation. It's |
| therefore better not to go narrower than TARGET_PRECISION. */ |
| if (TYPE_PRECISION (new_type) < target_precision) |
| new_type = build_nonstandard_integer_type (target_precision, |
| TYPE_UNSIGNED (new_type)); |
| |
| /* Check for target support. */ |
| tree new_vectype = get_vectype_for_scalar_type (vinfo, new_type); |
| if (!new_vectype) |
| return NULL; |
| |
| bool fallback_p = false; |
| |
| if (direct_internal_fn_supported_p (ifn, new_vectype, OPTIMIZE_FOR_SPEED)) |
| ; |
| else if (TYPE_UNSIGNED (new_type) |
| && optab_for_tree_code (RSHIFT_EXPR, new_vectype, optab_scalar) |
| && optab_for_tree_code (PLUS_EXPR, new_vectype, optab_default) |
| && optab_for_tree_code (BIT_IOR_EXPR, new_vectype, optab_default) |
| && optab_for_tree_code (BIT_AND_EXPR, new_vectype, optab_default)) |
| fallback_p = true; |
| else |
| return NULL; |
| |
| /* The IR requires a valid vector type for the cast result, even though |
| it's likely to be discarded. */ |
| *type_out = get_vectype_for_scalar_type (vinfo, type); |
| if (!*type_out) |
| return NULL; |
| |
| tree new_var = vect_recog_temp_ssa_var (new_type, NULL); |
| tree new_ops[2]; |
| vect_convert_inputs (last_stmt_info, 2, new_ops, new_type, |
| unprom, new_vectype); |
| |
| if (fallback_p) |
| { |
| /* As a fallback, generate code for following sequence: |
| |
| shifted_op0 = new_ops[0] >> 1; |
| shifted_op1 = new_ops[1] >> 1; |
| sum_of_shifted = shifted_op0 + shifted_op1; |
| unmasked_carry = new_ops[0] and/or new_ops[1]; |
| carry = unmasked_carry & 1; |
| new_var = sum_of_shifted + carry; |
| */ |
| |
| tree one_cst = build_one_cst (new_type); |
| gassign *g; |
| |
| tree shifted_op0 = vect_recog_temp_ssa_var (new_type, NULL); |
| g = gimple_build_assign (shifted_op0, RSHIFT_EXPR, new_ops[0], one_cst); |
| append_pattern_def_seq (last_stmt_info, g, new_vectype); |
| |
| tree shifted_op1 = vect_recog_temp_ssa_var (new_type, NULL); |
| g = gimple_build_assign (shifted_op1, RSHIFT_EXPR, new_ops[1], one_cst); |
| append_pattern_def_seq (last_stmt_info, g, new_vectype); |
| |
| tree sum_of_shifted = vect_recog_temp_ssa_var (new_type, NULL); |
| g = gimple_build_assign (sum_of_shifted, PLUS_EXPR, |
| shifted_op0, shifted_op1); |
| append_pattern_def_seq (last_stmt_info, g, new_vectype); |
| |
| tree unmasked_carry = vect_recog_temp_ssa_var (new_type, NULL); |
| tree_code c = (ifn == IFN_AVG_CEIL) ? BIT_IOR_EXPR : BIT_AND_EXPR; |
| g = gimple_build_assign (unmasked_carry, c, new_ops[0], new_ops[1]); |
| append_pattern_def_seq (last_stmt_info, g, new_vectype); |
| |
| tree carry = vect_recog_temp_ssa_var (new_type, NULL); |
| g = gimple_build_assign (carry, BIT_AND_EXPR, unmasked_carry, one_cst); |
| append_pattern_def_seq (last_stmt_info, g, new_vectype); |
| |
| g = gimple_build_assign (new_var, PLUS_EXPR, sum_of_shifted, carry); |
| return vect_convert_output (last_stmt_info, type, g, new_vectype); |
| } |
| |
| /* Generate the IFN_AVG* call. */ |
| gcall *average_stmt = gimple_build_call_internal (ifn, 2, new_ops[0], |
| new_ops[1]); |
| gimple_call_set_lhs (average_stmt, new_var); |
| gimple_set_location (average_stmt, gimple_location (last_stmt)); |
| |
| if (dump_enabled_p ()) |
| dump_printf_loc (MSG_NOTE, vect_location, |
| "created pattern stmt: %G", average_stmt); |
| |
| return vect_convert_output (last_stmt_info, type, average_stmt, new_vectype); |
| } |
| |
| /* Recognize cases in which the input to a cast is wider than its |
| output, and the input is fed by a widening operation. Fold this |
| by removing the unnecessary intermediate widening. E.g.: |
| |
| unsigned char a; |
| unsigned int b = (unsigned int) a; |
| unsigned short c = (unsigned short) b; |
| |
| --> |
| |
| unsigned short c = (unsigned short) a; |
| |
| Although this is rare in input IR, it is an expected side-effect |
| of the over-widening pattern above. |
| |
| This is beneficial also for integer-to-float conversions, if the |
| widened integer has more bits than the float, and if the unwidened |
| input doesn't. */ |
| |
| static gimple * |
| vect_recog_cast_forwprop_pattern (stmt_vec_info last_stmt_info, tree *type_out) |
| { |
| /* Check for a cast, including an integer-to-float conversion. */ |
| gassign *last_stmt = dyn_cast <gassign *> (last_stmt_info->stmt); |
| if (!last_stmt) |
| return NULL; |
| tree_code code = gimple_assign_rhs_code (last_stmt); |
| if (!CONVERT_EXPR_CODE_P (code) && code != FLOAT_EXPR) |
| return NULL; |
| |
| /* Make sure that the rhs is a scalar with a natural bitsize. */ |
| tree lhs = gimple_assign_lhs (last_stmt); |
| if (!lhs) |
| return NULL; |
| tree lhs_type = TREE_TYPE (lhs); |
| scalar_mode lhs_mode; |
| if (VECT_SCALAR_BOOLEAN_TYPE_P (lhs_type) |
| || !is_a <scalar_mode> (TYPE_MODE (lhs_type), &lhs_mode)) |
| return NULL; |
| |
| /* Check for a narrowing operation (from a vector point of view). */ |
| tree rhs = gimple_assign_rhs1 (last_stmt); |
| tree rhs_type = TREE_TYPE (rhs); |
| if (!INTEGRAL_TYPE_P (rhs_type) |
| || VECT_SCALAR_BOOLEAN_TYPE_P (rhs_type) |
| || TYPE_PRECISION (rhs_type) <= GET_MODE_BITSIZE (lhs_mode)) |
| return NULL; |
| |
| /* Try to find an unpromoted input. */ |
| vec_info *vinfo = last_stmt_info->vinfo; |
| vect_unpromoted_value unprom; |
| if (!vect_look_through_possible_promotion (vinfo, rhs, &unprom) |
| || TYPE_PRECISION (unprom.type) >= TYPE_PRECISION (rhs_type)) |
| return NULL; |
| |
| /* If the bits above RHS_TYPE matter, make sure that they're the |
| same when extending from UNPROM as they are when extending from RHS. */ |
| if (!INTEGRAL_TYPE_P (lhs_type) |
| && TYPE_SIGN (rhs_type) != TYPE_SIGN (unprom.type)) |
| return NULL; |
| |
| /* We can get the same result by casting UNPROM directly, to avoid |
| the unnecessary widening and narrowing. */ |
| vect_pattern_detected ("vect_recog_cast_forwprop_pattern", last_stmt); |
| |
| *type_out = get_vectype_for_scalar_type (vinfo, lhs_type); |
| if (!*type_out) |
| return NULL; |
| |
| tree new_var = vect_recog_temp_ssa_var (lhs_type, NULL); |
| gimple *pattern_stmt = gimple_build_assign (new_var, code, unprom.op); |
| gimple_set_location (pattern_stmt, gimple_location (last_stmt)); |
| |
| return pattern_stmt; |
| } |
| |
| /* Try to detect a shift left of a widened input, converting LSHIFT_EXPR |
| to WIDEN_LSHIFT_EXPR. See vect_recog_widen_op_pattern for details. */ |
| |
| static gimple * |
| vect_recog_widen_shift_pattern (stmt_vec_info last_stmt_info, tree *type_out) |
| { |
| return vect_recog_widen_op_pattern (last_stmt_info, type_out, LSHIFT_EXPR, |
| WIDEN_LSHIFT_EXPR, true, |
| "vect_recog_widen_shift_pattern"); |
| } |
| |
| /* Detect a rotate pattern wouldn't be otherwise vectorized: |
| |
| type a_t, b_t, c_t; |
| |
| S0 a_t = b_t r<< c_t; |
| |
| Input/Output: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins, |
| i.e. the shift/rotate stmt. The original stmt (S0) is replaced |
| with a sequence: |
| |
| S1 d_t = -c_t; |
| S2 e_t = d_t & (B - 1); |
| S3 f_t = b_t << c_t; |
| S4 g_t = b_t >> e_t; |
| S0 a_t = f_t | g_t; |
| |
| where B is element bitsize of type. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the rotate |
| S0 stmt. */ |
| |
| static gimple * |
| vect_recog_rotate_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| gimple *last_stmt = stmt_vinfo->stmt; |
| tree oprnd0, oprnd1, lhs, var, var1, var2, vectype, type, stype, def, def2; |
| gimple *pattern_stmt, *def_stmt; |
| enum tree_code rhs_code; |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| enum vect_def_type dt; |
| optab optab1, optab2; |
| edge ext_def = NULL; |
| bool bswap16_p = false; |
| |
| if (is_gimple_assign (last_stmt)) |
| { |
| rhs_code = gimple_assign_rhs_code (last_stmt); |
| switch (rhs_code) |
| { |
| case LROTATE_EXPR: |
| case RROTATE_EXPR: |
| break; |
| default: |
| return NULL; |
| } |
| |
| lhs = gimple_assign_lhs (last_stmt); |
| oprnd0 = gimple_assign_rhs1 (last_stmt); |
| type = TREE_TYPE (oprnd0); |
| oprnd1 = gimple_assign_rhs2 (last_stmt); |
| } |
| else if (gimple_call_builtin_p (last_stmt, BUILT_IN_BSWAP16)) |
| { |
| /* __builtin_bswap16 (x) is another form of x r>> 8. |
| The vectorizer has bswap support, but only if the argument isn't |
| promoted. */ |
| lhs = gimple_call_lhs (last_stmt); |
| oprnd0 = gimple_call_arg (last_stmt, 0); |
| type = TREE_TYPE (oprnd0); |
| if (!lhs |
| || TYPE_PRECISION (TREE_TYPE (lhs)) != 16 |
| || TYPE_PRECISION (type) <= 16 |
| || TREE_CODE (oprnd0) != SSA_NAME |
| || BITS_PER_UNIT != 8 |
| || !TYPE_UNSIGNED (TREE_TYPE (lhs))) |
| return NULL; |
| |
| stmt_vec_info def_stmt_info; |
| if (!vect_is_simple_use (oprnd0, vinfo, &dt, &def_stmt_info, &def_stmt)) |
| return NULL; |
| |
| if (dt != vect_internal_def) |
| return NULL; |
| |
| if (gimple_assign_cast_p (def_stmt)) |
| { |
| def = gimple_assign_rhs1 (def_stmt); |
| if (INTEGRAL_TYPE_P (TREE_TYPE (def)) |
| && TYPE_PRECISION (TREE_TYPE (def)) == 16) |
| oprnd0 = def; |
| } |
| |
| type = TREE_TYPE (lhs); |
| vectype = get_vectype_for_scalar_type (vinfo, type); |
| if (vectype == NULL_TREE) |
| return NULL; |
| |
| if (tree char_vectype = get_same_sized_vectype (char_type_node, vectype)) |
| { |
| /* The encoding uses one stepped pattern for each byte in the |
| 16-bit word. */ |
| vec_perm_builder elts (TYPE_VECTOR_SUBPARTS (char_vectype), 2, 3); |
| for (unsigned i = 0; i < 3; ++i) |
| for (unsigned j = 0; j < 2; ++j) |
| elts.quick_push ((i + 1) * 2 - j - 1); |
| |
| vec_perm_indices indices (elts, 1, |
| TYPE_VECTOR_SUBPARTS (char_vectype)); |
| if (can_vec_perm_const_p (TYPE_MODE (char_vectype), indices)) |
| { |
| /* vectorizable_bswap can handle the __builtin_bswap16 if we |
| undo the argument promotion. */ |
| if (!useless_type_conversion_p (type, TREE_TYPE (oprnd0))) |
| { |
| def = vect_recog_temp_ssa_var (type, NULL); |
| def_stmt = gimple_build_assign (def, NOP_EXPR, oprnd0); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| oprnd0 = def; |
| } |
| |
| /* Pattern detected. */ |
| vect_pattern_detected ("vect_recog_rotate_pattern", last_stmt); |
| |
| *type_out = vectype; |
| |
| /* Pattern supported. Create a stmt to be used to replace the |
| pattern, with the unpromoted argument. */ |
| var = vect_recog_temp_ssa_var (type, NULL); |
| pattern_stmt = gimple_build_call (gimple_call_fndecl (last_stmt), |
| 1, oprnd0); |
| gimple_call_set_lhs (pattern_stmt, var); |
| gimple_call_set_fntype (as_a <gcall *> (pattern_stmt), |
| gimple_call_fntype (last_stmt)); |
| return pattern_stmt; |
| } |
| } |
| |
| oprnd1 = build_int_cst (integer_type_node, 8); |
| rhs_code = LROTATE_EXPR; |
| bswap16_p = true; |
| } |
| else |
| return NULL; |
| |
| if (TREE_CODE (oprnd0) != SSA_NAME |
| || TYPE_PRECISION (TREE_TYPE (lhs)) != TYPE_PRECISION (type) |
| || !INTEGRAL_TYPE_P (type) |
| || !TYPE_UNSIGNED (type)) |
| return NULL; |
| |
| stmt_vec_info def_stmt_info; |
| if (!vect_is_simple_use (oprnd1, vinfo, &dt, &def_stmt_info, &def_stmt)) |
| return NULL; |
| |
| if (dt != vect_internal_def |
| && dt != vect_constant_def |
| && dt != vect_external_def) |
| return NULL; |
| |
| vectype = get_vectype_for_scalar_type (vinfo, type); |
| if (vectype == NULL_TREE) |
| return NULL; |
| |
| /* If vector/vector or vector/scalar rotate is supported by the target, |
| don't do anything here. */ |
| optab1 = optab_for_tree_code (rhs_code, vectype, optab_vector); |
| if (optab1 |
| && optab_handler (optab1, TYPE_MODE (vectype)) != CODE_FOR_nothing) |
| { |
| use_rotate: |
| if (bswap16_p) |
| { |
| if (!useless_type_conversion_p (type, TREE_TYPE (oprnd0))) |
| { |
| def = vect_recog_temp_ssa_var (type, NULL); |
| def_stmt = gimple_build_assign (def, NOP_EXPR, oprnd0); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| oprnd0 = def; |
| } |
| |
| /* Pattern detected. */ |
| vect_pattern_detected ("vect_recog_rotate_pattern", last_stmt); |
| |
| *type_out = vectype; |
| |
| /* Pattern supported. Create a stmt to be used to replace the |
| pattern. */ |
| var = vect_recog_temp_ssa_var (type, NULL); |
| pattern_stmt = gimple_build_assign (var, LROTATE_EXPR, oprnd0, |
| oprnd1); |
| return pattern_stmt; |
| } |
| return NULL; |
| } |
| |
| if (is_a <bb_vec_info> (vinfo) || dt != vect_internal_def) |
| { |
| optab2 = optab_for_tree_code (rhs_code, vectype, optab_scalar); |
| if (optab2 |
| && optab_handler (optab2, TYPE_MODE (vectype)) != CODE_FOR_nothing) |
| goto use_rotate; |
| } |
| |
| /* If vector/vector or vector/scalar shifts aren't supported by the target, |
| don't do anything here either. */ |
| optab1 = optab_for_tree_code (LSHIFT_EXPR, vectype, optab_vector); |
| optab2 = optab_for_tree_code (RSHIFT_EXPR, vectype, optab_vector); |
| if (!optab1 |
| || optab_handler (optab1, TYPE_MODE (vectype)) == CODE_FOR_nothing |
| || !optab2 |
| || optab_handler (optab2, TYPE_MODE (vectype)) == CODE_FOR_nothing) |
| { |
| if (! is_a <bb_vec_info> (vinfo) && dt == vect_internal_def) |
| return NULL; |
| optab1 = optab_for_tree_code (LSHIFT_EXPR, vectype, optab_scalar); |
| optab2 = optab_for_tree_code (RSHIFT_EXPR, vectype, optab_scalar); |
| if (!optab1 |
| || optab_handler (optab1, TYPE_MODE (vectype)) == CODE_FOR_nothing |
| || !optab2 |
| || optab_handler (optab2, TYPE_MODE (vectype)) == CODE_FOR_nothing) |
| return NULL; |
| } |
| |
| *type_out = vectype; |
| |
| if (bswap16_p && !useless_type_conversion_p (type, TREE_TYPE (oprnd0))) |
| { |
| def = vect_recog_temp_ssa_var (type, NULL); |
| def_stmt = gimple_build_assign (def, NOP_EXPR, oprnd0); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| oprnd0 = def; |
| } |
| |
| if (dt == vect_external_def && TREE_CODE (oprnd1) == SSA_NAME) |
| ext_def = vect_get_external_def_edge (vinfo, oprnd1); |
| |
| def = NULL_TREE; |
| scalar_int_mode mode = SCALAR_INT_TYPE_MODE (type); |
| if (dt != vect_internal_def || TYPE_MODE (TREE_TYPE (oprnd1)) == mode) |
| def = oprnd1; |
| else if (def_stmt && gimple_assign_cast_p (def_stmt)) |
| { |
| tree rhs1 = gimple_assign_rhs1 (def_stmt); |
| if (TYPE_MODE (TREE_TYPE (rhs1)) == mode |
| && TYPE_PRECISION (TREE_TYPE (rhs1)) |
| == TYPE_PRECISION (type)) |
| def = rhs1; |
| } |
| |
| if (def == NULL_TREE) |
| { |
| def = vect_recog_temp_ssa_var (type, NULL); |
| def_stmt = gimple_build_assign (def, NOP_EXPR, oprnd1); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| } |
| stype = TREE_TYPE (def); |
| |
| if (TREE_CODE (def) == INTEGER_CST) |
| { |
| if (!tree_fits_uhwi_p (def) |
| || tree_to_uhwi (def) >= GET_MODE_PRECISION (mode) |
| || integer_zerop (def)) |
| return NULL; |
| def2 = build_int_cst (stype, |
| GET_MODE_PRECISION (mode) - tree_to_uhwi (def)); |
| } |
| else |
| { |
| tree vecstype = get_vectype_for_scalar_type (vinfo, stype); |
| |
| if (vecstype == NULL_TREE) |
| return NULL; |
| def2 = vect_recog_temp_ssa_var (stype, NULL); |
| def_stmt = gimple_build_assign (def2, NEGATE_EXPR, def); |
| if (ext_def) |
| { |
| basic_block new_bb |
| = gsi_insert_on_edge_immediate (ext_def, def_stmt); |
| gcc_assert (!new_bb); |
| } |
| else |
| append_pattern_def_seq (stmt_vinfo, def_stmt, vecstype); |
| |
| def2 = vect_recog_temp_ssa_var (stype, NULL); |
| tree mask = build_int_cst (stype, GET_MODE_PRECISION (mode) - 1); |
| def_stmt = gimple_build_assign (def2, BIT_AND_EXPR, |
| gimple_assign_lhs (def_stmt), mask); |
| if (ext_def) |
| { |
| basic_block new_bb |
| = gsi_insert_on_edge_immediate (ext_def, def_stmt); |
| gcc_assert (!new_bb); |
| } |
| else |
| append_pattern_def_seq (stmt_vinfo, def_stmt, vecstype); |
| } |
| |
| var1 = vect_recog_temp_ssa_var (type, NULL); |
| def_stmt = gimple_build_assign (var1, rhs_code == LROTATE_EXPR |
| ? LSHIFT_EXPR : RSHIFT_EXPR, |
| oprnd0, def); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| |
| var2 = vect_recog_temp_ssa_var (type, NULL); |
| def_stmt = gimple_build_assign (var2, rhs_code == LROTATE_EXPR |
| ? RSHIFT_EXPR : LSHIFT_EXPR, |
| oprnd0, def2); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| |
| /* Pattern detected. */ |
| vect_pattern_detected ("vect_recog_rotate_pattern", last_stmt); |
| |
| /* Pattern supported. Create a stmt to be used to replace the pattern. */ |
| var = vect_recog_temp_ssa_var (type, NULL); |
| pattern_stmt = gimple_build_assign (var, BIT_IOR_EXPR, var1, var2); |
| |
| return pattern_stmt; |
| } |
| |
| /* Detect a vector by vector shift pattern that wouldn't be otherwise |
| vectorized: |
| |
| type a_t; |
| TYPE b_T, res_T; |
| |
| S1 a_t = ; |
| S2 b_T = ; |
| S3 res_T = b_T op a_t; |
| |
| where type 'TYPE' is a type with different size than 'type', |
| and op is <<, >> or rotate. |
| |
| Also detect cases: |
| |
| type a_t; |
| TYPE b_T, c_T, res_T; |
| |
| S0 c_T = ; |
| S1 a_t = (type) c_T; |
| S2 b_T = ; |
| S3 res_T = b_T op a_t; |
| |
| Input/Output: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins, |
| i.e. the shift/rotate stmt. The original stmt (S3) is replaced |
| with a shift/rotate which has same type on both operands, in the |
| second case just b_T op c_T, in the first case with added cast |
| from a_t to c_T in STMT_VINFO_PATTERN_DEF_SEQ. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the shift/rotate |
| S3 stmt. */ |
| |
| static gimple * |
| vect_recog_vector_vector_shift_pattern (stmt_vec_info stmt_vinfo, |
| tree *type_out) |
| { |
| gimple *last_stmt = stmt_vinfo->stmt; |
| tree oprnd0, oprnd1, lhs, var; |
| gimple *pattern_stmt; |
| enum tree_code rhs_code; |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| |
| if (!is_gimple_assign (last_stmt)) |
| return NULL; |
| |
| rhs_code = gimple_assign_rhs_code (last_stmt); |
| switch (rhs_code) |
| { |
| case LSHIFT_EXPR: |
| case RSHIFT_EXPR: |
| case LROTATE_EXPR: |
| case RROTATE_EXPR: |
| break; |
| default: |
| return NULL; |
| } |
| |
| lhs = gimple_assign_lhs (last_stmt); |
| oprnd0 = gimple_assign_rhs1 (last_stmt); |
| oprnd1 = gimple_assign_rhs2 (last_stmt); |
| if (TREE_CODE (oprnd0) != SSA_NAME |
| || TREE_CODE (oprnd1) != SSA_NAME |
| || TYPE_MODE (TREE_TYPE (oprnd0)) == TYPE_MODE (TREE_TYPE (oprnd1)) |
| || !type_has_mode_precision_p (TREE_TYPE (oprnd1)) |
| || TYPE_PRECISION (TREE_TYPE (lhs)) |
| != TYPE_PRECISION (TREE_TYPE (oprnd0))) |
| return NULL; |
| |
| stmt_vec_info def_vinfo = vect_get_internal_def (vinfo, oprnd1); |
| if (!def_vinfo) |
| return NULL; |
| |
| *type_out = get_vectype_for_scalar_type (vinfo, TREE_TYPE (oprnd0)); |
| if (*type_out == NULL_TREE) |
| return NULL; |
| |
| tree def = NULL_TREE; |
| gassign *def_stmt = dyn_cast <gassign *> (def_vinfo->stmt); |
| if (def_stmt && gimple_assign_cast_p (def_stmt)) |
| { |
| tree rhs1 = gimple_assign_rhs1 (def_stmt); |
| if (TYPE_MODE (TREE_TYPE (rhs1)) == TYPE_MODE (TREE_TYPE (oprnd0)) |
| && TYPE_PRECISION (TREE_TYPE (rhs1)) |
| == TYPE_PRECISION (TREE_TYPE (oprnd0))) |
| { |
| if (TYPE_PRECISION (TREE_TYPE (oprnd1)) |
| >= TYPE_PRECISION (TREE_TYPE (rhs1))) |
| def = rhs1; |
| else |
| { |
| tree mask |
| = build_low_bits_mask (TREE_TYPE (rhs1), |
| TYPE_PRECISION (TREE_TYPE (oprnd1))); |
| def = vect_recog_temp_ssa_var (TREE_TYPE (rhs1), NULL); |
| def_stmt = gimple_build_assign (def, BIT_AND_EXPR, rhs1, mask); |
| tree vecstype = get_vectype_for_scalar_type (vinfo, |
| TREE_TYPE (rhs1)); |
| append_pattern_def_seq (stmt_vinfo, def_stmt, vecstype); |
| } |
| } |
| } |
| |
| if (def == NULL_TREE) |
| { |
| def = vect_recog_temp_ssa_var (TREE_TYPE (oprnd0), NULL); |
| def_stmt = gimple_build_assign (def, NOP_EXPR, oprnd1); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| } |
| |
| /* Pattern detected. */ |
| vect_pattern_detected ("vect_recog_vector_vector_shift_pattern", last_stmt); |
| |
| /* Pattern supported. Create a stmt to be used to replace the pattern. */ |
| var = vect_recog_temp_ssa_var (TREE_TYPE (oprnd0), NULL); |
| pattern_stmt = gimple_build_assign (var, rhs_code, oprnd0, def); |
| |
| return pattern_stmt; |
| } |
| |
| /* Return true iff the target has a vector optab implementing the operation |
| CODE on type VECTYPE. */ |
| |
| static bool |
| target_has_vecop_for_code (tree_code code, tree vectype) |
| { |
| optab voptab = optab_for_tree_code (code, vectype, optab_vector); |
| return voptab |
| && optab_handler (voptab, TYPE_MODE (vectype)) != CODE_FOR_nothing; |
| } |
| |
| /* Verify that the target has optabs of VECTYPE to perform all the steps |
| needed by the multiplication-by-immediate synthesis algorithm described by |
| ALG and VAR. If SYNTH_SHIFT_P is true ensure that vector addition is |
| present. Return true iff the target supports all the steps. */ |
| |
| static bool |
| target_supports_mult_synth_alg (struct algorithm *alg, mult_variant var, |
| tree vectype, bool synth_shift_p) |
| { |
| if (alg->op[0] != alg_zero && alg->op[0] != alg_m) |
| return false; |
| |
| bool supports_vminus = target_has_vecop_for_code (MINUS_EXPR, vectype); |
| bool supports_vplus = target_has_vecop_for_code (PLUS_EXPR, vectype); |
| |
| if (var == negate_variant |
| && !target_has_vecop_for_code (NEGATE_EXPR, vectype)) |
| return false; |
| |
| /* If we must synthesize shifts with additions make sure that vector |
| addition is available. */ |
| if ((var == add_variant || synth_shift_p) && !supports_vplus) |
| return false; |
| |
| for (int i = 1; i < alg->ops; i++) |
| { |
| switch (alg->op[i]) |
| { |
| case alg_shift: |
| break; |
| case alg_add_t_m2: |
| case alg_add_t2_m: |
| case alg_add_factor: |
| if (!supports_vplus) |
| return false; |
| break; |
| case alg_sub_t_m2: |
| case alg_sub_t2_m: |
| case alg_sub_factor: |
| if (!supports_vminus) |
| return false; |
| break; |
| case alg_unknown: |
| case alg_m: |
| case alg_zero: |
| case alg_impossible: |
| return false; |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| return true; |
| } |
| |
| /* Synthesize a left shift of OP by AMNT bits using a series of additions and |
| putting the final result in DEST. Append all statements but the last into |
| VINFO. Return the last statement. */ |
| |
| static gimple * |
| synth_lshift_by_additions (tree dest, tree op, HOST_WIDE_INT amnt, |
| stmt_vec_info vinfo) |
| { |
| HOST_WIDE_INT i; |
| tree itype = TREE_TYPE (op); |
| tree prev_res = op; |
| gcc_assert (amnt >= 0); |
| for (i = 0; i < amnt; i++) |
| { |
| tree tmp_var = (i < amnt - 1) ? vect_recog_temp_ssa_var (itype, NULL) |
| : dest; |
| gimple *stmt |
| = gimple_build_assign (tmp_var, PLUS_EXPR, prev_res, prev_res); |
| prev_res = tmp_var; |
| if (i < amnt - 1) |
| append_pattern_def_seq (vinfo, stmt); |
| else |
| return stmt; |
| } |
| gcc_unreachable (); |
| return NULL; |
| } |
| |
| /* Helper for vect_synth_mult_by_constant. Apply a binary operation |
| CODE to operands OP1 and OP2, creating a new temporary SSA var in |
| the process if necessary. Append the resulting assignment statements |
| to the sequence in STMT_VINFO. Return the SSA variable that holds the |
| result of the binary operation. If SYNTH_SHIFT_P is true synthesize |
| left shifts using additions. */ |
| |
| static tree |
| apply_binop_and_append_stmt (tree_code code, tree op1, tree op2, |
| stmt_vec_info stmt_vinfo, bool synth_shift_p) |
| { |
| if (integer_zerop (op2) |
| && (code == LSHIFT_EXPR |
| || code == PLUS_EXPR)) |
| { |
| gcc_assert (TREE_CODE (op1) == SSA_NAME); |
| return op1; |
| } |
| |
| gimple *stmt; |
| tree itype = TREE_TYPE (op1); |
| tree tmp_var = vect_recog_temp_ssa_var (itype, NULL); |
| |
| if (code == LSHIFT_EXPR |
| && synth_shift_p) |
| { |
| stmt = synth_lshift_by_additions (tmp_var, op1, TREE_INT_CST_LOW (op2), |
| stmt_vinfo); |
| append_pattern_def_seq (stmt_vinfo, stmt); |
| return tmp_var; |
| } |
| |
| stmt = gimple_build_assign (tmp_var, code, op1, op2); |
| append_pattern_def_seq (stmt_vinfo, stmt); |
| return tmp_var; |
| } |
| |
| /* Synthesize a multiplication of OP by an INTEGER_CST VAL using shifts |
| and simple arithmetic operations to be vectorized. Record the statements |
| produced in STMT_VINFO and return the last statement in the sequence or |
| NULL if it's not possible to synthesize such a multiplication. |
| This function mirrors the behavior of expand_mult_const in expmed.c but |
| works on tree-ssa form. */ |
| |
| static gimple * |
| vect_synth_mult_by_constant (tree op, tree val, |
| stmt_vec_info stmt_vinfo) |
| { |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| tree itype = TREE_TYPE (op); |
| machine_mode mode = TYPE_MODE (itype); |
| struct algorithm alg; |
| mult_variant variant; |
| if (!tree_fits_shwi_p (val)) |
| return NULL; |
| |
| /* Multiplication synthesis by shifts, adds and subs can introduce |
| signed overflow where the original operation didn't. Perform the |
| operations on an unsigned type and cast back to avoid this. |
| In the future we may want to relax this for synthesis algorithms |
| that we can prove do not cause unexpected overflow. */ |
| bool cast_to_unsigned_p = !TYPE_OVERFLOW_WRAPS (itype); |
| |
| tree multtype = cast_to_unsigned_p ? unsigned_type_for (itype) : itype; |
| |
| /* Targets that don't support vector shifts but support vector additions |
| can synthesize shifts that way. */ |
| bool synth_shift_p = !vect_supportable_shift (vinfo, LSHIFT_EXPR, multtype); |
| |
| HOST_WIDE_INT hwval = tree_to_shwi (val); |
| /* Use MAX_COST here as we don't want to limit the sequence on rtx costs. |
| The vectorizer's benefit analysis will decide whether it's beneficial |
| to do this. */ |
| bool possible = choose_mult_variant (mode, hwval, &alg, |
| &variant, MAX_COST); |
| if (!possible) |
| return NULL; |
| |
| tree vectype = get_vectype_for_scalar_type (vinfo, multtype); |
| |
| if (!vectype |
| || !target_supports_mult_synth_alg (&alg, variant, |
| vectype, synth_shift_p)) |
| return NULL; |
| |
| tree accumulator; |
| |
| /* Clear out the sequence of statements so we can populate it below. */ |
| gimple *stmt = NULL; |
| |
| if (cast_to_unsigned_p) |
| { |
| tree tmp_op = vect_recog_temp_ssa_var (multtype, NULL); |
| stmt = gimple_build_assign (tmp_op, CONVERT_EXPR, op); |
| append_pattern_def_seq (stmt_vinfo, stmt); |
| op = tmp_op; |
| } |
| |
| if (alg.op[0] == alg_zero) |
| accumulator = build_int_cst (multtype, 0); |
| else |
| accumulator = op; |
| |
| bool needs_fixup = (variant == negate_variant) |
| || (variant == add_variant); |
| |
| for (int i = 1; i < alg.ops; i++) |
| { |
| tree shft_log = build_int_cst (multtype, alg.log[i]); |
| tree accum_tmp = vect_recog_temp_ssa_var (multtype, NULL); |
| tree tmp_var = NULL_TREE; |
| |
| switch (alg.op[i]) |
| { |
| case alg_shift: |
| if (synth_shift_p) |
| stmt |
| = synth_lshift_by_additions (accum_tmp, accumulator, alg.log[i], |
| stmt_vinfo); |
| else |
| stmt = gimple_build_assign (accum_tmp, LSHIFT_EXPR, accumulator, |
| shft_log); |
| break; |
| case alg_add_t_m2: |
| tmp_var |
| = apply_binop_and_append_stmt (LSHIFT_EXPR, op, shft_log, |
| stmt_vinfo, synth_shift_p); |
| stmt = gimple_build_assign (accum_tmp, PLUS_EXPR, accumulator, |
| tmp_var); |
| break; |
| case alg_sub_t_m2: |
| tmp_var = apply_binop_and_append_stmt (LSHIFT_EXPR, op, |
| shft_log, stmt_vinfo, |
| synth_shift_p); |
| /* In some algorithms the first step involves zeroing the |
| accumulator. If subtracting from such an accumulator |
| just emit the negation directly. */ |
| if (integer_zerop (accumulator)) |
| stmt = gimple_build_assign (accum_tmp, NEGATE_EXPR, tmp_var); |
| else |
| stmt = gimple_build_assign (accum_tmp, MINUS_EXPR, accumulator, |
| tmp_var); |
| break; |
| case alg_add_t2_m: |
| tmp_var |
| = apply_binop_and_append_stmt (LSHIFT_EXPR, accumulator, shft_log, |
| stmt_vinfo, synth_shift_p); |
| stmt = gimple_build_assign (accum_tmp, PLUS_EXPR, tmp_var, op); |
| break; |
| case alg_sub_t2_m: |
| tmp_var |
| = apply_binop_and_append_stmt (LSHIFT_EXPR, accumulator, shft_log, |
| stmt_vinfo, synth_shift_p); |
| stmt = gimple_build_assign (accum_tmp, MINUS_EXPR, tmp_var, op); |
| break; |
| case alg_add_factor: |
| tmp_var |
| = apply_binop_and_append_stmt (LSHIFT_EXPR, accumulator, shft_log, |
| stmt_vinfo, synth_shift_p); |
| stmt = gimple_build_assign (accum_tmp, PLUS_EXPR, accumulator, |
| tmp_var); |
| break; |
| case alg_sub_factor: |
| tmp_var |
| = apply_binop_and_append_stmt (LSHIFT_EXPR, accumulator, shft_log, |
| stmt_vinfo, synth_shift_p); |
| stmt = gimple_build_assign (accum_tmp, MINUS_EXPR, tmp_var, |
| accumulator); |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| /* We don't want to append the last stmt in the sequence to stmt_vinfo |
| but rather return it directly. */ |
| |
| if ((i < alg.ops - 1) || needs_fixup || cast_to_unsigned_p) |
| append_pattern_def_seq (stmt_vinfo, stmt); |
| accumulator = accum_tmp; |
| } |
| if (variant == negate_variant) |
| { |
| tree accum_tmp = vect_recog_temp_ssa_var (multtype, NULL); |
| stmt = gimple_build_assign (accum_tmp, NEGATE_EXPR, accumulator); |
| accumulator = accum_tmp; |
| if (cast_to_unsigned_p) |
| append_pattern_def_seq (stmt_vinfo, stmt); |
| } |
| else if (variant == add_variant) |
| { |
| tree accum_tmp = vect_recog_temp_ssa_var (multtype, NULL); |
| stmt = gimple_build_assign (accum_tmp, PLUS_EXPR, accumulator, op); |
| accumulator = accum_tmp; |
| if (cast_to_unsigned_p) |
| append_pattern_def_seq (stmt_vinfo, stmt); |
| } |
| /* Move back to a signed if needed. */ |
| if (cast_to_unsigned_p) |
| { |
| tree accum_tmp = vect_recog_temp_ssa_var (itype, NULL); |
| stmt = gimple_build_assign (accum_tmp, CONVERT_EXPR, accumulator); |
| } |
| |
| return stmt; |
| } |
| |
| /* Detect multiplication by constant and convert it into a sequence of |
| shifts and additions, subtractions, negations. We reuse the |
| choose_mult_variant algorithms from expmed.c |
| |
| Input/Output: |
| |
| STMT_VINFO: The stmt from which the pattern search begins, |
| i.e. the mult stmt. |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace |
| the multiplication. */ |
| |
| static gimple * |
| vect_recog_mult_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| gimple *last_stmt = stmt_vinfo->stmt; |
| tree oprnd0, oprnd1, vectype, itype; |
| gimple *pattern_stmt; |
| |
| if (!is_gimple_assign (last_stmt)) |
| return NULL; |
| |
| if (gimple_assign_rhs_code (last_stmt) != MULT_EXPR) |
| return NULL; |
| |
| oprnd0 = gimple_assign_rhs1 (last_stmt); |
| oprnd1 = gimple_assign_rhs2 (last_stmt); |
| itype = TREE_TYPE (oprnd0); |
| |
| if (TREE_CODE (oprnd0) != SSA_NAME |
| || TREE_CODE (oprnd1) != INTEGER_CST |
| || !INTEGRAL_TYPE_P (itype) |
| || !type_has_mode_precision_p (itype)) |
| return NULL; |
| |
| vectype = get_vectype_for_scalar_type (vinfo, itype); |
| if (vectype == NULL_TREE) |
| return NULL; |
| |
| /* If the target can handle vectorized multiplication natively, |
| don't attempt to optimize this. */ |
| optab mul_optab = optab_for_tree_code (MULT_EXPR, vectype, optab_default); |
| if (mul_optab != unknown_optab) |
| { |
| machine_mode vec_mode = TYPE_MODE (vectype); |
| int icode = (int) optab_handler (mul_optab, vec_mode); |
| if (icode != CODE_FOR_nothing) |
| return NULL; |
| } |
| |
| pattern_stmt = vect_synth_mult_by_constant (oprnd0, oprnd1, stmt_vinfo); |
| if (!pattern_stmt) |
| return NULL; |
| |
| /* Pattern detected. */ |
| vect_pattern_detected ("vect_recog_mult_pattern", last_stmt); |
| |
| *type_out = vectype; |
| |
| return pattern_stmt; |
| } |
| |
| /* Detect a signed division by a constant that wouldn't be |
| otherwise vectorized: |
| |
| type a_t, b_t; |
| |
| S1 a_t = b_t / N; |
| |
| where type 'type' is an integral type and N is a constant. |
| |
| Similarly handle modulo by a constant: |
| |
| S4 a_t = b_t % N; |
| |
| Input/Output: |
| |
| * STMT_VINFO: The stmt from which the pattern search begins, |
| i.e. the division stmt. S1 is replaced by if N is a power |
| of two constant and type is signed: |
| S3 y_t = b_t < 0 ? N - 1 : 0; |
| S2 x_t = b_t + y_t; |
| S1' a_t = x_t >> log2 (N); |
| |
| S4 is replaced if N is a power of two constant and |
| type is signed by (where *_T temporaries have unsigned type): |
| S9 y_T = b_t < 0 ? -1U : 0U; |
| S8 z_T = y_T >> (sizeof (type_t) * CHAR_BIT - log2 (N)); |
| S7 z_t = (type) z_T; |
| S6 w_t = b_t + z_t; |
| S5 x_t = w_t & (N - 1); |
| S4' a_t = x_t - z_t; |
| |
| Output: |
| |
| * TYPE_OUT: The type of the output of this pattern. |
| |
| * Return value: A new stmt that will be used to replace the division |
| S1 or modulo S4 stmt. */ |
| |
| static gimple * |
| vect_recog_divmod_pattern (stmt_vec_info stmt_vinfo, tree *type_out) |
| { |
| vec_info *vinfo = stmt_vinfo->vinfo; |
| gimple *last_stmt = stmt_vinfo->stmt; |
| tree oprnd0, oprnd1, vectype, itype, cond; |
| gimple *pattern_stmt, *def_stmt; |
| enum tree_code rhs_code; |
| optab optab; |
| tree q; |
| int dummy_int, prec; |
| |
| if (!is_gimple_assign (last_stmt)) |
| return NULL; |
| |
| rhs_code = gimple_assign_rhs_code (last_stmt); |
| switch (rhs_code) |
| { |
| case TRUNC_DIV_EXPR: |
| case EXACT_DIV_EXPR: |
| case TRUNC_MOD_EXPR: |
| break; |
| default: |
| return NULL; |
| } |
| |
| oprnd0 = gimple_assign_rhs1 (last_stmt); |
| oprnd1 = gimple_assign_rhs2 (last_stmt); |
| itype = TREE_TYPE (oprnd0); |
| if (TREE_CODE (oprnd0) != SSA_NAME |
| || TREE_CODE (oprnd1) != INTEGER_CST |
| || TREE_CODE (itype) != INTEGER_TYPE |
| || !type_has_mode_precision_p (itype)) |
| return NULL; |
| |
| scalar_int_mode itype_mode = SCALAR_INT_TYPE_MODE (itype); |
| vectype = get_vectype_for_scalar_type (vinfo, itype); |
| if (vectype == NULL_TREE) |
| return NULL; |
| |
| if (optimize_bb_for_size_p (gimple_bb (last_stmt))) |
| { |
| /* If the target can handle vectorized division or modulo natively, |
| don't attempt to optimize this, since native division is likely |
| to give smaller code. */ |
| optab = optab_for_tree_code (rhs_code, vectype, optab_default); |
| if (optab != unknown_optab) |
| { |
| machine_mode vec_mode = TYPE_MODE (vectype); |
| int icode = (int) optab_handler (optab, vec_mode); |
| if (icode != CODE_FOR_nothing) |
| return NULL; |
| } |
| } |
| |
| prec = TYPE_PRECISION (itype); |
| if (integer_pow2p (oprnd1)) |
| { |
| if (TYPE_UNSIGNED (itype) || tree_int_cst_sgn (oprnd1) != 1) |
| return NULL; |
| |
| /* Pattern detected. */ |
| vect_pattern_detected ("vect_recog_divmod_pattern", last_stmt); |
| |
| *type_out = vectype; |
| |
| /* Check if the target supports this internal function. */ |
| internal_fn ifn = IFN_DIV_POW2; |
| if (direct_internal_fn_supported_p (ifn, vectype, OPTIMIZE_FOR_SPEED)) |
| { |
| tree shift = build_int_cst (itype, tree_log2 (oprnd1)); |
| |
| tree var_div = vect_recog_temp_ssa_var (itype, NULL); |
| gimple *div_stmt = gimple_build_call_internal (ifn, 2, oprnd0, shift); |
| gimple_call_set_lhs (div_stmt, var_div); |
| |
| if (rhs_code == TRUNC_MOD_EXPR) |
| { |
| append_pattern_def_seq (stmt_vinfo, div_stmt); |
| def_stmt |
| = gimple_build_assign (vect_recog_temp_ssa_var (itype, NULL), |
| LSHIFT_EXPR, var_div, shift); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| pattern_stmt |
| = gimple_build_assign (vect_recog_temp_ssa_var (itype, NULL), |
| MINUS_EXPR, oprnd0, |
| gimple_assign_lhs (def_stmt)); |
| } |
| else |
| pattern_stmt = div_stmt; |
| gimple_set_location (pattern_stmt, gimple_location (last_stmt)); |
| |
| return pattern_stmt; |
| } |
| |
| cond = build2 (LT_EXPR, boolean_type_node, oprnd0, |
| build_int_cst (itype, 0)); |
| if (rhs_code == TRUNC_DIV_EXPR |
| || rhs_code == EXACT_DIV_EXPR) |
| { |
| tree var = vect_recog_temp_ssa_var (itype, NULL); |
| tree shift; |
| def_stmt |
| = gimple_build_assign (var, COND_EXPR, cond, |
| fold_build2 (MINUS_EXPR, itype, oprnd1, |
| build_int_cst (itype, 1)), |
| build_int_cst (itype, 0)); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| var = vect_recog_temp_ssa_var (itype, NULL); |
| def_stmt |
| = gimple_build_assign (var, PLUS_EXPR, oprnd0, |
| gimple_assign_lhs (def_stmt)); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| |
| shift = build_int_cst (itype, tree_log2 (oprnd1)); |
| pattern_stmt |
| = gimple_build_assign (vect_recog_temp_ssa_var (itype, NULL), |
| RSHIFT_EXPR, var, shift); |
| } |
| else |
| { |
| tree signmask; |
| if (compare_tree_int (oprnd1, 2) == 0) |
| { |
| signmask = vect_recog_temp_ssa_var (itype, NULL); |
| def_stmt = gimple_build_assign (signmask, COND_EXPR, cond, |
| build_int_cst (itype, 1), |
| build_int_cst (itype, 0)); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| } |
| else |
| { |
| tree utype |
| = build_nonstandard_integer_type (prec, 1); |
| tree vecutype = get_vectype_for_scalar_type (vinfo, utype); |
| tree shift |
| = build_int_cst (utype, GET_MODE_BITSIZE (itype_mode) |
| - tree_log2 (oprnd1)); |
| tree var = vect_recog_temp_ssa_var (utype, NULL); |
| |
| def_stmt = gimple_build_assign (var, COND_EXPR, cond, |
| build_int_cst (utype, -1), |
| build_int_cst (utype, 0)); |
| append_pattern_def_seq (stmt_vinfo, def_stmt, vecutype); |
| var = vect_recog_temp_ssa_var (utype, NULL); |
| def_stmt = gimple_build_assign (var, RSHIFT_EXPR, |
| gimple_assign_lhs (def_stmt), |
| shift); |
| append_pattern_def_seq (stmt_vinfo, def_stmt, vecutype); |
| signmask = vect_recog_temp_ssa_var (itype, NULL); |
| def_stmt |
| = gimple_build_assign (signmask, NOP_EXPR, var); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| } |
| def_stmt |
| = gimple_build_assign (vect_recog_temp_ssa_var (itype, NULL), |
| PLUS_EXPR, oprnd0, signmask); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| def_stmt |
| = gimple_build_assign (vect_recog_temp_ssa_var (itype, NULL), |
| BIT_AND_EXPR, gimple_assign_lhs (def_stmt), |
| fold_build2 (MINUS_EXPR, itype, oprnd1, |
| build_int_cst (itype, 1))); |
| append_pattern_def_seq (stmt_vinfo, def_stmt); |
| |
| pattern_stmt |
| = gimple_build_assign (vect_recog_temp_ssa_var (itype, NULL), |
| MINUS_EXPR, gimple_assign_lhs (def_stmt), |
| signmask); |
| } |
| |
| return pattern_stmt; |
| } |
| |
| if (prec > HOST_BITS_PER_WIDE_INT |
| || integer_zerop (oprnd1)) |
| return NULL; |
| |
| if (!can_mult_highpart_p (TYPE_MODE (vectype), TYPE_UNSIGNED (itype))) |
| return NULL; |
| |
| if (TYPE_UNSIGNED (itype)) |
| { |
| unsigned HOST_WIDE_INT mh, ml; |
| int pre_shift, post_shift; |
| unsigned HOST_WIDE_INT d = (TREE_INT_CST_LOW (oprnd1) |
| & GET_MODE_MASK (itype_mode)); |
| tree t1, t2, t3, t4; |
| |
| if (d >= (HOST_WIDE_INT_1U << (prec - 1))) |
| /* FIXME: Can transform this into oprnd0 >= oprnd1 ? 1 : 0. */ |
| return NULL; |
| |
| /* Find a suitable multiplier and right shift count |
| instead of multiplying with D. */ |
| mh = choose_multiplier (d, prec, prec, &ml, &post_shift, &dummy_int); |
| |
| /* If the suggested multiplier is more than SIZE bits, we can do better |
| for even divisors, using an initial right shift. */ |
| if (mh != 0 && (d & 1) == 0) |
| { |
| pre_shift = ctz_or_zero (d); |
| mh = choose_multiplier (d >> pre_shift, prec, prec - pre_shift, |
| &ml, &post_shift, &dummy_int); |
| gcc_assert (!mh); |
| } |
| else |
| pre_shift = 0; |
| |
| if (mh != 0) |
| { |
| if (post_shift - 1 >= prec) |
| return NULL; |
| |
| /* t1 = oprnd0 h* ml; |
| t2 = oprnd0 - t1; |
|