| /* Preamble and helpers for the autogenerated gimple-match.c file. |
| Copyright (C) 2014-2020 Free Software Foundation, Inc. |
| |
| 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 "target.h" |
| #include "rtl.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "ssa.h" |
| #include "cgraph.h" |
| #include "vec-perm-indices.h" |
| #include "fold-const.h" |
| #include "fold-const-call.h" |
| #include "stor-layout.h" |
| #include "gimple-fold.h" |
| #include "calls.h" |
| #include "tree-dfa.h" |
| #include "builtins.h" |
| #include "gimple-match.h" |
| #include "tree-pass.h" |
| #include "internal-fn.h" |
| #include "case-cfn-macros.h" |
| #include "gimplify.h" |
| #include "optabs-tree.h" |
| #include "tree-eh.h" |
| #include "dbgcnt.h" |
| |
| /* Forward declarations of the private auto-generated matchers. |
| They expect valueized operands in canonical order and do not |
| perform simplification of all-constant operands. */ |
| static bool gimple_simplify (gimple_match_op *, gimple_seq *, tree (*)(tree), |
| code_helper, tree, tree); |
| static bool gimple_simplify (gimple_match_op *, gimple_seq *, tree (*)(tree), |
| code_helper, tree, tree, tree); |
| static bool gimple_simplify (gimple_match_op *, gimple_seq *, tree (*)(tree), |
| code_helper, tree, tree, tree, tree); |
| static bool gimple_simplify (gimple_match_op *, gimple_seq *, tree (*)(tree), |
| code_helper, tree, tree, tree, tree, tree); |
| static bool gimple_simplify (gimple_match_op *, gimple_seq *, tree (*)(tree), |
| code_helper, tree, tree, tree, tree, tree, tree); |
| static bool gimple_resimplify1 (gimple_seq *, gimple_match_op *, |
| tree (*)(tree)); |
| static bool gimple_resimplify2 (gimple_seq *, gimple_match_op *, |
| tree (*)(tree)); |
| static bool gimple_resimplify3 (gimple_seq *, gimple_match_op *, |
| tree (*)(tree)); |
| static bool gimple_resimplify4 (gimple_seq *, gimple_match_op *, |
| tree (*)(tree)); |
| static bool gimple_resimplify5 (gimple_seq *, gimple_match_op *, |
| tree (*)(tree)); |
| |
| const unsigned int gimple_match_op::MAX_NUM_OPS; |
| |
| /* Return whether T is a constant that we'll dispatch to fold to |
| evaluate fully constant expressions. */ |
| |
| static inline bool |
| constant_for_folding (tree t) |
| { |
| return (CONSTANT_CLASS_P (t) |
| /* The following is only interesting to string builtins. */ |
| || (TREE_CODE (t) == ADDR_EXPR |
| && TREE_CODE (TREE_OPERAND (t, 0)) == STRING_CST)); |
| } |
| |
| /* Try to convert conditional operation ORIG_OP into an IFN_COND_* |
| operation. Return true on success, storing the new operation in NEW_OP. */ |
| |
| static bool |
| convert_conditional_op (gimple_match_op *orig_op, |
| gimple_match_op *new_op) |
| { |
| internal_fn ifn; |
| if (orig_op->code.is_tree_code ()) |
| ifn = get_conditional_internal_fn ((tree_code) orig_op->code); |
| else |
| { |
| combined_fn cfn = orig_op->code; |
| if (!internal_fn_p (cfn)) |
| return false; |
| ifn = get_conditional_internal_fn (as_internal_fn (cfn)); |
| } |
| if (ifn == IFN_LAST) |
| return false; |
| unsigned int num_ops = orig_op->num_ops; |
| new_op->set_op (as_combined_fn (ifn), orig_op->type, num_ops + 2); |
| new_op->ops[0] = orig_op->cond.cond; |
| for (unsigned int i = 0; i < num_ops; ++i) |
| new_op->ops[i + 1] = orig_op->ops[i]; |
| tree else_value = orig_op->cond.else_value; |
| if (!else_value) |
| else_value = targetm.preferred_else_value (ifn, orig_op->type, |
| num_ops, orig_op->ops); |
| new_op->ops[num_ops + 1] = else_value; |
| return true; |
| } |
| |
| /* RES_OP is the result of a simplification. If it is conditional, |
| try to replace it with the equivalent UNCOND form, such as an |
| IFN_COND_* call or a VEC_COND_EXPR. Also try to resimplify the |
| result of the replacement if appropriate, adding any new statements to |
| SEQ and using VALUEIZE as the valueization function. Return true if |
| this resimplification occurred and resulted in at least one change. */ |
| |
| static bool |
| maybe_resimplify_conditional_op (gimple_seq *seq, gimple_match_op *res_op, |
| tree (*valueize) (tree)) |
| { |
| if (!res_op->cond.cond) |
| return false; |
| |
| if (!res_op->cond.else_value |
| && res_op->code.is_tree_code ()) |
| { |
| /* The "else" value doesn't matter. If the "then" value is a |
| gimple value, just use it unconditionally. This isn't a |
| simplification in itself, since there was no operation to |
| build in the first place. */ |
| if (gimple_simplified_result_is_gimple_val (res_op)) |
| { |
| res_op->cond.cond = NULL_TREE; |
| return false; |
| } |
| |
| /* Likewise if the operation would not trap. */ |
| bool honor_trapv = (INTEGRAL_TYPE_P (res_op->type) |
| && TYPE_OVERFLOW_TRAPS (res_op->type)); |
| tree_code op_code = (tree_code) res_op->code; |
| bool op_could_trap; |
| |
| /* COND_EXPR and VEC_COND_EXPR will trap if, and only if, the condition |
| traps and hence we have to check this. For all other operations, we |
| don't need to consider the operands. */ |
| if (op_code == COND_EXPR || op_code == VEC_COND_EXPR) |
| op_could_trap = generic_expr_could_trap_p (res_op->ops[0]); |
| else |
| op_could_trap = operation_could_trap_p ((tree_code) res_op->code, |
| FLOAT_TYPE_P (res_op->type), |
| honor_trapv, |
| res_op->op_or_null (1)); |
| |
| if (!op_could_trap) |
| { |
| res_op->cond.cond = NULL_TREE; |
| return false; |
| } |
| } |
| |
| /* If the "then" value is a gimple value and the "else" value matters, |
| create a VEC_COND_EXPR between them, then see if it can be further |
| simplified. */ |
| gimple_match_op new_op; |
| if (res_op->cond.else_value |
| && VECTOR_TYPE_P (res_op->type) |
| && gimple_simplified_result_is_gimple_val (res_op)) |
| { |
| new_op.set_op (VEC_COND_EXPR, res_op->type, |
| res_op->cond.cond, res_op->ops[0], |
| res_op->cond.else_value); |
| *res_op = new_op; |
| return gimple_resimplify3 (seq, res_op, valueize); |
| } |
| |
| /* Otherwise try rewriting the operation as an IFN_COND_* call. |
| Again, this isn't a simplification in itself, since it's what |
| RES_OP already described. */ |
| if (convert_conditional_op (res_op, &new_op)) |
| *res_op = new_op; |
| |
| return false; |
| } |
| |
| /* Helper that matches and simplifies the toplevel result from |
| a gimple_simplify run (where we don't want to build |
| a stmt in case it's used in in-place folding). Replaces |
| RES_OP with a simplified and/or canonicalized result and |
| returns whether any change was made. */ |
| |
| static bool |
| gimple_resimplify1 (gimple_seq *seq, gimple_match_op *res_op, |
| tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (res_op->ops[0])) |
| { |
| tree tem = NULL_TREE; |
| if (res_op->code.is_tree_code ()) |
| { |
| tree_code code = res_op->code; |
| if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)) |
| && TREE_CODE_LENGTH (code) == 1) |
| tem = const_unop (res_op->code, res_op->type, res_op->ops[0]); |
| } |
| else |
| tem = fold_const_call (combined_fn (res_op->code), res_op->type, |
| res_op->ops[0]); |
| if (tem != NULL_TREE |
| && CONSTANT_CLASS_P (tem)) |
| { |
| if (TREE_OVERFLOW_P (tem)) |
| tem = drop_tree_overflow (tem); |
| res_op->set_value (tem); |
| maybe_resimplify_conditional_op (seq, res_op, valueize); |
| return true; |
| } |
| } |
| |
| /* Limit recursion, there are cases like PR80887 and others, for |
| example when value-numbering presents us with unfolded expressions |
| that we are really not prepared to handle without eventual |
| oscillation like ((_50 + 0) + 8) where _50 gets mapped to _50 |
| itself as available expression. */ |
| static unsigned depth; |
| if (depth > 10) |
| { |
| if (dump_file && (dump_flags & TDF_FOLDING)) |
| fprintf (dump_file, "Aborting expression simplification due to " |
| "deep recursion\n"); |
| return false; |
| } |
| |
| ++depth; |
| gimple_match_op res_op2 (*res_op); |
| if (gimple_simplify (&res_op2, seq, valueize, |
| res_op->code, res_op->type, res_op->ops[0])) |
| { |
| --depth; |
| *res_op = res_op2; |
| return true; |
| } |
| --depth; |
| |
| if (maybe_resimplify_conditional_op (seq, res_op, valueize)) |
| return true; |
| |
| return false; |
| } |
| |
| /* Helper that matches and simplifies the toplevel result from |
| a gimple_simplify run (where we don't want to build |
| a stmt in case it's used in in-place folding). Replaces |
| RES_OP with a simplified and/or canonicalized result and |
| returns whether any change was made. */ |
| |
| static bool |
| gimple_resimplify2 (gimple_seq *seq, gimple_match_op *res_op, |
| tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (res_op->ops[0]) |
| && constant_for_folding (res_op->ops[1])) |
| { |
| tree tem = NULL_TREE; |
| if (res_op->code.is_tree_code ()) |
| { |
| tree_code code = res_op->code; |
| if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)) |
| && TREE_CODE_LENGTH (code) == 2) |
| tem = const_binop (res_op->code, res_op->type, |
| res_op->ops[0], res_op->ops[1]); |
| } |
| else |
| tem = fold_const_call (combined_fn (res_op->code), res_op->type, |
| res_op->ops[0], res_op->ops[1]); |
| if (tem != NULL_TREE |
| && CONSTANT_CLASS_P (tem)) |
| { |
| if (TREE_OVERFLOW_P (tem)) |
| tem = drop_tree_overflow (tem); |
| res_op->set_value (tem); |
| maybe_resimplify_conditional_op (seq, res_op, valueize); |
| return true; |
| } |
| } |
| |
| /* Canonicalize operand order. */ |
| bool canonicalized = false; |
| if (res_op->code.is_tree_code () |
| && (TREE_CODE_CLASS ((enum tree_code) res_op->code) == tcc_comparison |
| || commutative_tree_code (res_op->code)) |
| && tree_swap_operands_p (res_op->ops[0], res_op->ops[1])) |
| { |
| std::swap (res_op->ops[0], res_op->ops[1]); |
| if (TREE_CODE_CLASS ((enum tree_code) res_op->code) == tcc_comparison) |
| res_op->code = swap_tree_comparison (res_op->code); |
| canonicalized = true; |
| } |
| |
| /* Limit recursion, see gimple_resimplify1. */ |
| static unsigned depth; |
| if (depth > 10) |
| { |
| if (dump_file && (dump_flags & TDF_FOLDING)) |
| fprintf (dump_file, "Aborting expression simplification due to " |
| "deep recursion\n"); |
| return false; |
| } |
| |
| ++depth; |
| gimple_match_op res_op2 (*res_op); |
| if (gimple_simplify (&res_op2, seq, valueize, |
| res_op->code, res_op->type, |
| res_op->ops[0], res_op->ops[1])) |
| { |
| --depth; |
| *res_op = res_op2; |
| return true; |
| } |
| --depth; |
| |
| if (maybe_resimplify_conditional_op (seq, res_op, valueize)) |
| return true; |
| |
| return canonicalized; |
| } |
| |
| /* Helper that matches and simplifies the toplevel result from |
| a gimple_simplify run (where we don't want to build |
| a stmt in case it's used in in-place folding). Replaces |
| RES_OP with a simplified and/or canonicalized result and |
| returns whether any change was made. */ |
| |
| static bool |
| gimple_resimplify3 (gimple_seq *seq, gimple_match_op *res_op, |
| tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (res_op->ops[0]) |
| && constant_for_folding (res_op->ops[1]) |
| && constant_for_folding (res_op->ops[2])) |
| { |
| tree tem = NULL_TREE; |
| if (res_op->code.is_tree_code ()) |
| { |
| tree_code code = res_op->code; |
| if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)) |
| && TREE_CODE_LENGTH (code) == 3) |
| tem = fold_ternary/*_to_constant*/ (res_op->code, res_op->type, |
| res_op->ops[0], res_op->ops[1], |
| res_op->ops[2]); |
| } |
| else |
| tem = fold_const_call (combined_fn (res_op->code), res_op->type, |
| res_op->ops[0], res_op->ops[1], res_op->ops[2]); |
| if (tem != NULL_TREE |
| && CONSTANT_CLASS_P (tem)) |
| { |
| if (TREE_OVERFLOW_P (tem)) |
| tem = drop_tree_overflow (tem); |
| res_op->set_value (tem); |
| maybe_resimplify_conditional_op (seq, res_op, valueize); |
| return true; |
| } |
| } |
| |
| /* Canonicalize operand order. */ |
| bool canonicalized = false; |
| if (res_op->code.is_tree_code () |
| && commutative_ternary_tree_code (res_op->code) |
| && tree_swap_operands_p (res_op->ops[0], res_op->ops[1])) |
| { |
| std::swap (res_op->ops[0], res_op->ops[1]); |
| canonicalized = true; |
| } |
| |
| /* Limit recursion, see gimple_resimplify1. */ |
| static unsigned depth; |
| if (depth > 10) |
| { |
| if (dump_file && (dump_flags & TDF_FOLDING)) |
| fprintf (dump_file, "Aborting expression simplification due to " |
| "deep recursion\n"); |
| return false; |
| } |
| |
| ++depth; |
| gimple_match_op res_op2 (*res_op); |
| if (gimple_simplify (&res_op2, seq, valueize, |
| res_op->code, res_op->type, |
| res_op->ops[0], res_op->ops[1], res_op->ops[2])) |
| { |
| --depth; |
| *res_op = res_op2; |
| return true; |
| } |
| --depth; |
| |
| if (maybe_resimplify_conditional_op (seq, res_op, valueize)) |
| return true; |
| |
| return canonicalized; |
| } |
| |
| /* Helper that matches and simplifies the toplevel result from |
| a gimple_simplify run (where we don't want to build |
| a stmt in case it's used in in-place folding). Replaces |
| RES_OP with a simplified and/or canonicalized result and |
| returns whether any change was made. */ |
| |
| static bool |
| gimple_resimplify4 (gimple_seq *seq, gimple_match_op *res_op, |
| tree (*valueize)(tree)) |
| { |
| /* No constant folding is defined for four-operand functions. */ |
| |
| /* Limit recursion, see gimple_resimplify1. */ |
| static unsigned depth; |
| if (depth > 10) |
| { |
| if (dump_file && (dump_flags & TDF_FOLDING)) |
| fprintf (dump_file, "Aborting expression simplification due to " |
| "deep recursion\n"); |
| return false; |
| } |
| |
| ++depth; |
| gimple_match_op res_op2 (*res_op); |
| if (gimple_simplify (&res_op2, seq, valueize, |
| res_op->code, res_op->type, |
| res_op->ops[0], res_op->ops[1], res_op->ops[2], |
| res_op->ops[3])) |
| { |
| --depth; |
| *res_op = res_op2; |
| return true; |
| } |
| --depth; |
| |
| if (maybe_resimplify_conditional_op (seq, res_op, valueize)) |
| return true; |
| |
| return false; |
| } |
| |
| /* Helper that matches and simplifies the toplevel result from |
| a gimple_simplify run (where we don't want to build |
| a stmt in case it's used in in-place folding). Replaces |
| RES_OP with a simplified and/or canonicalized result and |
| returns whether any change was made. */ |
| |
| static bool |
| gimple_resimplify5 (gimple_seq *seq, gimple_match_op *res_op, |
| tree (*valueize)(tree)) |
| { |
| /* No constant folding is defined for five-operand functions. */ |
| |
| gimple_match_op res_op2 (*res_op); |
| if (gimple_simplify (&res_op2, seq, valueize, |
| res_op->code, res_op->type, |
| res_op->ops[0], res_op->ops[1], res_op->ops[2], |
| res_op->ops[3], res_op->ops[4])) |
| { |
| *res_op = res_op2; |
| return true; |
| } |
| |
| if (maybe_resimplify_conditional_op (seq, res_op, valueize)) |
| return true; |
| |
| return false; |
| } |
| |
| /* Match and simplify the toplevel valueized operation THIS. |
| Replaces THIS with a simplified and/or canonicalized result and |
| returns whether any change was made. */ |
| |
| bool |
| gimple_match_op::resimplify (gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| switch (num_ops) |
| { |
| case 1: |
| return gimple_resimplify1 (seq, this, valueize); |
| case 2: |
| return gimple_resimplify2 (seq, this, valueize); |
| case 3: |
| return gimple_resimplify3 (seq, this, valueize); |
| case 4: |
| return gimple_resimplify4 (seq, this, valueize); |
| case 5: |
| return gimple_resimplify5 (seq, this, valueize); |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| /* If in GIMPLE the operation described by RES_OP should be single-rhs, |
| build a GENERIC tree for that expression and update RES_OP accordingly. */ |
| |
| void |
| maybe_build_generic_op (gimple_match_op *res_op) |
| { |
| tree_code code = (tree_code) res_op->code; |
| tree val; |
| switch (code) |
| { |
| case REALPART_EXPR: |
| case IMAGPART_EXPR: |
| case VIEW_CONVERT_EXPR: |
| val = build1 (code, res_op->type, res_op->ops[0]); |
| res_op->set_value (val); |
| break; |
| case BIT_FIELD_REF: |
| val = build3 (code, res_op->type, res_op->ops[0], res_op->ops[1], |
| res_op->ops[2]); |
| REF_REVERSE_STORAGE_ORDER (val) = res_op->reverse; |
| res_op->set_value (val); |
| break; |
| default:; |
| } |
| } |
| |
| tree (*mprts_hook) (gimple_match_op *); |
| |
| /* Try to build RES_OP, which is known to be a call to FN. Return null |
| if the target doesn't support the function. */ |
| |
| static gcall * |
| build_call_internal (internal_fn fn, gimple_match_op *res_op) |
| { |
| if (direct_internal_fn_p (fn)) |
| { |
| tree_pair types = direct_internal_fn_types (fn, res_op->type, |
| res_op->ops); |
| if (!direct_internal_fn_supported_p (fn, types, OPTIMIZE_FOR_BOTH)) |
| return NULL; |
| } |
| return gimple_build_call_internal (fn, res_op->num_ops, |
| res_op->op_or_null (0), |
| res_op->op_or_null (1), |
| res_op->op_or_null (2), |
| res_op->op_or_null (3), |
| res_op->op_or_null (4)); |
| } |
| |
| /* Push the exploded expression described by RES_OP as a statement to |
| SEQ if necessary and return a gimple value denoting the value of the |
| expression. If RES is not NULL then the result will be always RES |
| and even gimple values are pushed to SEQ. */ |
| |
| tree |
| maybe_push_res_to_seq (gimple_match_op *res_op, gimple_seq *seq, tree res) |
| { |
| tree *ops = res_op->ops; |
| unsigned num_ops = res_op->num_ops; |
| |
| /* The caller should have converted conditional operations into an UNCOND |
| form and resimplified as appropriate. The conditional form only |
| survives this far if that conversion failed. */ |
| if (res_op->cond.cond) |
| return NULL_TREE; |
| |
| if (res_op->code.is_tree_code ()) |
| { |
| if (!res |
| && gimple_simplified_result_is_gimple_val (res_op)) |
| return ops[0]; |
| if (mprts_hook) |
| { |
| tree tem = mprts_hook (res_op); |
| if (tem) |
| return tem; |
| } |
| } |
| |
| if (!seq) |
| return NULL_TREE; |
| |
| /* Play safe and do not allow abnormals to be mentioned in |
| newly created statements. */ |
| for (unsigned int i = 0; i < num_ops; ++i) |
| if (TREE_CODE (ops[i]) == SSA_NAME |
| && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (ops[i])) |
| return NULL_TREE; |
| |
| if (num_ops > 0 && COMPARISON_CLASS_P (ops[0])) |
| for (unsigned int i = 0; i < 2; ++i) |
| if (TREE_CODE (TREE_OPERAND (ops[0], i)) == SSA_NAME |
| && SSA_NAME_OCCURS_IN_ABNORMAL_PHI (TREE_OPERAND (ops[0], i))) |
| return NULL_TREE; |
| |
| if (res_op->code.is_tree_code ()) |
| { |
| if (!res) |
| { |
| if (gimple_in_ssa_p (cfun)) |
| res = make_ssa_name (res_op->type); |
| else |
| res = create_tmp_reg (res_op->type); |
| } |
| maybe_build_generic_op (res_op); |
| gimple *new_stmt = gimple_build_assign (res, res_op->code, |
| res_op->op_or_null (0), |
| res_op->op_or_null (1), |
| res_op->op_or_null (2)); |
| gimple_seq_add_stmt_without_update (seq, new_stmt); |
| return res; |
| } |
| else |
| { |
| gcc_assert (num_ops != 0); |
| combined_fn fn = res_op->code; |
| gcall *new_stmt = NULL; |
| if (internal_fn_p (fn)) |
| { |
| /* Generate the given function if we can. */ |
| internal_fn ifn = as_internal_fn (fn); |
| new_stmt = build_call_internal (ifn, res_op); |
| if (!new_stmt) |
| return NULL_TREE; |
| } |
| else |
| { |
| /* Find the function we want to call. */ |
| tree decl = builtin_decl_implicit (as_builtin_fn (fn)); |
| if (!decl) |
| return NULL; |
| |
| /* We can't and should not emit calls to non-const functions. */ |
| if (!(flags_from_decl_or_type (decl) & ECF_CONST)) |
| return NULL; |
| |
| new_stmt = gimple_build_call (decl, num_ops, |
| res_op->op_or_null (0), |
| res_op->op_or_null (1), |
| res_op->op_or_null (2), |
| res_op->op_or_null (3), |
| res_op->op_or_null (4)); |
| } |
| if (!res) |
| { |
| if (gimple_in_ssa_p (cfun)) |
| res = make_ssa_name (res_op->type); |
| else |
| res = create_tmp_reg (res_op->type); |
| } |
| gimple_call_set_lhs (new_stmt, res); |
| gimple_seq_add_stmt_without_update (seq, new_stmt); |
| return res; |
| } |
| } |
| |
| |
| /* Public API overloads follow for operation being tree_code or |
| built_in_function and for one to three operands or arguments. |
| They return NULL_TREE if nothing could be simplified or |
| the resulting simplified value with parts pushed to SEQ. |
| If SEQ is NULL then if the simplification needs to create |
| new stmts it will fail. If VALUEIZE is non-NULL then all |
| SSA names will be valueized using that hook prior to |
| applying simplifications. */ |
| |
| /* Unary ops. */ |
| |
| tree |
| gimple_simplify (enum tree_code code, tree type, |
| tree op0, |
| gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (op0)) |
| { |
| tree res = const_unop (code, type, op0); |
| if (res != NULL_TREE |
| && CONSTANT_CLASS_P (res)) |
| return res; |
| } |
| |
| gimple_match_op res_op; |
| if (!gimple_simplify (&res_op, seq, valueize, code, type, op0)) |
| return NULL_TREE; |
| return maybe_push_res_to_seq (&res_op, seq); |
| } |
| |
| /* Binary ops. */ |
| |
| tree |
| gimple_simplify (enum tree_code code, tree type, |
| tree op0, tree op1, |
| gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (op0) && constant_for_folding (op1)) |
| { |
| tree res = const_binop (code, type, op0, op1); |
| if (res != NULL_TREE |
| && CONSTANT_CLASS_P (res)) |
| return res; |
| } |
| |
| /* Canonicalize operand order both for matching and fallback stmt |
| generation. */ |
| if ((commutative_tree_code (code) |
| || TREE_CODE_CLASS (code) == tcc_comparison) |
| && tree_swap_operands_p (op0, op1)) |
| { |
| std::swap (op0, op1); |
| if (TREE_CODE_CLASS (code) == tcc_comparison) |
| code = swap_tree_comparison (code); |
| } |
| |
| gimple_match_op res_op; |
| if (!gimple_simplify (&res_op, seq, valueize, code, type, op0, op1)) |
| return NULL_TREE; |
| return maybe_push_res_to_seq (&res_op, seq); |
| } |
| |
| /* Ternary ops. */ |
| |
| tree |
| gimple_simplify (enum tree_code code, tree type, |
| tree op0, tree op1, tree op2, |
| gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (op0) && constant_for_folding (op1) |
| && constant_for_folding (op2)) |
| { |
| tree res = fold_ternary/*_to_constant */ (code, type, op0, op1, op2); |
| if (res != NULL_TREE |
| && CONSTANT_CLASS_P (res)) |
| return res; |
| } |
| |
| /* Canonicalize operand order both for matching and fallback stmt |
| generation. */ |
| if (commutative_ternary_tree_code (code) |
| && tree_swap_operands_p (op0, op1)) |
| std::swap (op0, op1); |
| |
| gimple_match_op res_op; |
| if (!gimple_simplify (&res_op, seq, valueize, code, type, op0, op1, op2)) |
| return NULL_TREE; |
| return maybe_push_res_to_seq (&res_op, seq); |
| } |
| |
| /* Builtin or internal function with one argument. */ |
| |
| tree |
| gimple_simplify (combined_fn fn, tree type, |
| tree arg0, |
| gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (arg0)) |
| { |
| tree res = fold_const_call (fn, type, arg0); |
| if (res && CONSTANT_CLASS_P (res)) |
| return res; |
| } |
| |
| gimple_match_op res_op; |
| if (!gimple_simplify (&res_op, seq, valueize, fn, type, arg0)) |
| return NULL_TREE; |
| return maybe_push_res_to_seq (&res_op, seq); |
| } |
| |
| /* Builtin or internal function with two arguments. */ |
| |
| tree |
| gimple_simplify (combined_fn fn, tree type, |
| tree arg0, tree arg1, |
| gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (arg0) |
| && constant_for_folding (arg1)) |
| { |
| tree res = fold_const_call (fn, type, arg0, arg1); |
| if (res && CONSTANT_CLASS_P (res)) |
| return res; |
| } |
| |
| gimple_match_op res_op; |
| if (!gimple_simplify (&res_op, seq, valueize, fn, type, arg0, arg1)) |
| return NULL_TREE; |
| return maybe_push_res_to_seq (&res_op, seq); |
| } |
| |
| /* Builtin or internal function with three arguments. */ |
| |
| tree |
| gimple_simplify (combined_fn fn, tree type, |
| tree arg0, tree arg1, tree arg2, |
| gimple_seq *seq, tree (*valueize)(tree)) |
| { |
| if (constant_for_folding (arg0) |
| && constant_for_folding (arg1) |
| && constant_for_folding (arg2)) |
| { |
| tree res = fold_const_call (fn, type, arg0, arg1, arg2); |
| if (res && CONSTANT_CLASS_P (res)) |
| return res; |
| } |
| |
| gimple_match_op res_op; |
| if (!gimple_simplify (&res_op, seq, valueize, fn, type, arg0, arg1, arg2)) |
| return NULL_TREE; |
| return maybe_push_res_to_seq (&res_op, seq); |
| } |
| |
| /* Helper for gimple_simplify valueizing OP using VALUEIZE and setting |
| VALUEIZED to true if valueization changed OP. */ |
| |
| static inline tree |
| do_valueize (tree op, tree (*valueize)(tree), bool &valueized) |
| { |
| if (valueize && TREE_CODE (op) == SSA_NAME) |
| { |
| tree tem = valueize (op); |
| if (tem && tem != op) |
| { |
| op = tem; |
| valueized = true; |
| } |
| } |
| return op; |
| } |
| |
| /* If RES_OP is a call to a conditional internal function, try simplifying |
| the associated unconditional operation and using the result to build |
| a new conditional operation. For example, if RES_OP is: |
| |
| IFN_COND_ADD (COND, A, B, ELSE) |
| |
| try simplifying (plus A B) and using the result to build a replacement |
| for the whole IFN_COND_ADD. |
| |
| Return true if this approach led to a simplification, otherwise leave |
| RES_OP unchanged (and so suitable for other simplifications). When |
| returning true, add any new statements to SEQ and use VALUEIZE as the |
| valueization function. |
| |
| RES_OP is known to be a call to IFN. */ |
| |
| static bool |
| try_conditional_simplification (internal_fn ifn, gimple_match_op *res_op, |
| gimple_seq *seq, tree (*valueize) (tree)) |
| { |
| code_helper op; |
| tree_code code = conditional_internal_fn_code (ifn); |
| if (code != ERROR_MARK) |
| op = code; |
| else |
| { |
| ifn = get_unconditional_internal_fn (ifn); |
| if (ifn == IFN_LAST) |
| return false; |
| op = as_combined_fn (ifn); |
| } |
| |
| unsigned int num_ops = res_op->num_ops; |
| gimple_match_op cond_op (gimple_match_cond (res_op->ops[0], |
| res_op->ops[num_ops - 1]), |
| op, res_op->type, num_ops - 2); |
| |
| memcpy (cond_op.ops, res_op->ops + 1, (num_ops - 1) * sizeof *cond_op.ops); |
| switch (num_ops - 2) |
| { |
| case 2: |
| if (!gimple_resimplify2 (seq, &cond_op, valueize)) |
| return false; |
| break; |
| case 3: |
| if (!gimple_resimplify3 (seq, &cond_op, valueize)) |
| return false; |
| break; |
| default: |
| gcc_unreachable (); |
| } |
| *res_op = cond_op; |
| maybe_resimplify_conditional_op (seq, res_op, valueize); |
| return true; |
| } |
| |
| /* The main STMT based simplification entry. It is used by the fold_stmt |
| and the fold_stmt_to_constant APIs. */ |
| |
| bool |
| gimple_simplify (gimple *stmt, gimple_match_op *res_op, gimple_seq *seq, |
| tree (*valueize)(tree), tree (*top_valueize)(tree)) |
| { |
| switch (gimple_code (stmt)) |
| { |
| case GIMPLE_ASSIGN: |
| { |
| enum tree_code code = gimple_assign_rhs_code (stmt); |
| tree type = TREE_TYPE (gimple_assign_lhs (stmt)); |
| switch (gimple_assign_rhs_class (stmt)) |
| { |
| case GIMPLE_SINGLE_RHS: |
| if (code == REALPART_EXPR |
| || code == IMAGPART_EXPR |
| || code == VIEW_CONVERT_EXPR) |
| { |
| tree op0 = TREE_OPERAND (gimple_assign_rhs1 (stmt), 0); |
| bool valueized = false; |
| op0 = do_valueize (op0, top_valueize, valueized); |
| res_op->set_op (code, type, op0); |
| return (gimple_resimplify1 (seq, res_op, valueize) |
| || valueized); |
| } |
| else if (code == BIT_FIELD_REF) |
| { |
| tree rhs1 = gimple_assign_rhs1 (stmt); |
| tree op0 = TREE_OPERAND (rhs1, 0); |
| bool valueized = false; |
| op0 = do_valueize (op0, top_valueize, valueized); |
| res_op->set_op (code, type, op0, |
| TREE_OPERAND (rhs1, 1), |
| TREE_OPERAND (rhs1, 2), |
| REF_REVERSE_STORAGE_ORDER (rhs1)); |
| if (res_op->reverse) |
| return valueized; |
| return (gimple_resimplify3 (seq, res_op, valueize) |
| || valueized); |
| } |
| else if (code == SSA_NAME |
| && top_valueize) |
| { |
| tree op0 = gimple_assign_rhs1 (stmt); |
| tree valueized = top_valueize (op0); |
| if (!valueized || op0 == valueized) |
| return false; |
| res_op->set_op (TREE_CODE (op0), type, valueized); |
| return true; |
| } |
| break; |
| case GIMPLE_UNARY_RHS: |
| { |
| tree rhs1 = gimple_assign_rhs1 (stmt); |
| bool valueized = false; |
| rhs1 = do_valueize (rhs1, top_valueize, valueized); |
| res_op->set_op (code, type, rhs1); |
| return (gimple_resimplify1 (seq, res_op, valueize) |
| || valueized); |
| } |
| case GIMPLE_BINARY_RHS: |
| { |
| tree rhs1 = gimple_assign_rhs1 (stmt); |
| tree rhs2 = gimple_assign_rhs2 (stmt); |
| bool valueized = false; |
| rhs1 = do_valueize (rhs1, top_valueize, valueized); |
| rhs2 = do_valueize (rhs2, top_valueize, valueized); |
| res_op->set_op (code, type, rhs1, rhs2); |
| return (gimple_resimplify2 (seq, res_op, valueize) |
| || valueized); |
| } |
| case GIMPLE_TERNARY_RHS: |
| { |
| bool valueized = false; |
| tree rhs1 = gimple_assign_rhs1 (stmt); |
| /* If this is a [VEC_]COND_EXPR first try to simplify an |
| embedded GENERIC condition. */ |
| if (code == COND_EXPR |
| || code == VEC_COND_EXPR) |
| { |
| if (COMPARISON_CLASS_P (rhs1)) |
| { |
| tree lhs = TREE_OPERAND (rhs1, 0); |
| tree rhs = TREE_OPERAND (rhs1, 1); |
| lhs = do_valueize (lhs, top_valueize, valueized); |
| rhs = do_valueize (rhs, top_valueize, valueized); |
| gimple_match_op res_op2 (res_op->cond, TREE_CODE (rhs1), |
| TREE_TYPE (rhs1), lhs, rhs); |
| if ((gimple_resimplify2 (seq, &res_op2, valueize) |
| || valueized) |
| && res_op2.code.is_tree_code ()) |
| { |
| valueized = true; |
| if (TREE_CODE_CLASS ((enum tree_code) res_op2.code) |
| == tcc_comparison) |
| rhs1 = build2 (res_op2.code, TREE_TYPE (rhs1), |
| res_op2.ops[0], res_op2.ops[1]); |
| else if (res_op2.code == SSA_NAME |
| || res_op2.code == INTEGER_CST |
| || res_op2.code == VECTOR_CST) |
| rhs1 = res_op2.ops[0]; |
| else |
| valueized = false; |
| } |
| } |
| } |
| tree rhs2 = gimple_assign_rhs2 (stmt); |
| tree rhs3 = gimple_assign_rhs3 (stmt); |
| rhs1 = do_valueize (rhs1, top_valueize, valueized); |
| rhs2 = do_valueize (rhs2, top_valueize, valueized); |
| rhs3 = do_valueize (rhs3, top_valueize, valueized); |
| res_op->set_op (code, type, rhs1, rhs2, rhs3); |
| return (gimple_resimplify3 (seq, res_op, valueize) |
| || valueized); |
| } |
| default: |
| gcc_unreachable (); |
| } |
| break; |
| } |
| |
| case GIMPLE_CALL: |
| /* ??? This way we can't simplify calls with side-effects. */ |
| if (gimple_call_lhs (stmt) != NULL_TREE |
| && gimple_call_num_args (stmt) >= 1 |
| && gimple_call_num_args (stmt) <= 5) |
| { |
| bool valueized = false; |
| combined_fn cfn; |
| if (gimple_call_internal_p (stmt)) |
| cfn = as_combined_fn (gimple_call_internal_fn (stmt)); |
| else |
| { |
| tree fn = gimple_call_fn (stmt); |
| if (!fn) |
| return false; |
| |
| fn = do_valueize (fn, top_valueize, valueized); |
| if (TREE_CODE (fn) != ADDR_EXPR |
| || TREE_CODE (TREE_OPERAND (fn, 0)) != FUNCTION_DECL) |
| return false; |
| |
| tree decl = TREE_OPERAND (fn, 0); |
| if (DECL_BUILT_IN_CLASS (decl) != BUILT_IN_NORMAL |
| || !gimple_builtin_call_types_compatible_p (stmt, decl)) |
| return false; |
| |
| cfn = as_combined_fn (DECL_FUNCTION_CODE (decl)); |
| } |
| |
| unsigned int num_args = gimple_call_num_args (stmt); |
| res_op->set_op (cfn, TREE_TYPE (gimple_call_lhs (stmt)), num_args); |
| for (unsigned i = 0; i < num_args; ++i) |
| { |
| tree arg = gimple_call_arg (stmt, i); |
| res_op->ops[i] = do_valueize (arg, top_valueize, valueized); |
| } |
| if (internal_fn_p (cfn) |
| && try_conditional_simplification (as_internal_fn (cfn), |
| res_op, seq, valueize)) |
| return true; |
| switch (num_args) |
| { |
| case 1: |
| return (gimple_resimplify1 (seq, res_op, valueize) |
| || valueized); |
| case 2: |
| return (gimple_resimplify2 (seq, res_op, valueize) |
| || valueized); |
| case 3: |
| return (gimple_resimplify3 (seq, res_op, valueize) |
| || valueized); |
| case 4: |
| return (gimple_resimplify4 (seq, res_op, valueize) |
| || valueized); |
| case 5: |
| return (gimple_resimplify5 (seq, res_op, valueize) |
| || valueized); |
| default: |
| gcc_unreachable (); |
| } |
| } |
| break; |
| |
| case GIMPLE_COND: |
| { |
| tree lhs = gimple_cond_lhs (stmt); |
| tree rhs = gimple_cond_rhs (stmt); |
| bool valueized = false; |
| lhs = do_valueize (lhs, top_valueize, valueized); |
| rhs = do_valueize (rhs, top_valueize, valueized); |
| res_op->set_op (gimple_cond_code (stmt), boolean_type_node, lhs, rhs); |
| return (gimple_resimplify2 (seq, res_op, valueize) |
| || valueized); |
| } |
| |
| default: |
| break; |
| } |
| |
| return false; |
| } |
| |
| |
| /* Helper for the autogenerated code, valueize OP. */ |
| |
| inline tree |
| do_valueize (tree (*valueize)(tree), tree op) |
| { |
| if (valueize && TREE_CODE (op) == SSA_NAME) |
| { |
| tree tem = valueize (op); |
| if (tem) |
| return tem; |
| } |
| return op; |
| } |
| |
| /* Helper for the autogenerated code, get at the definition of NAME when |
| VALUEIZE allows that. */ |
| |
| inline gimple * |
| get_def (tree (*valueize)(tree), tree name) |
| { |
| if (valueize && ! valueize (name)) |
| return NULL; |
| return SSA_NAME_DEF_STMT (name); |
| } |
| |
| /* Routine to determine if the types T1 and T2 are effectively |
| the same for GIMPLE. If T1 or T2 is not a type, the test |
| applies to their TREE_TYPE. */ |
| |
| static inline bool |
| types_match (tree t1, tree t2) |
| { |
| if (!TYPE_P (t1)) |
| t1 = TREE_TYPE (t1); |
| if (!TYPE_P (t2)) |
| t2 = TREE_TYPE (t2); |
| |
| return types_compatible_p (t1, t2); |
| } |
| |
| /* Return if T has a single use. For GIMPLE, we also allow any |
| non-SSA_NAME (ie constants) and zero uses to cope with uses |
| that aren't linked up yet. */ |
| |
| static inline bool |
| single_use (tree t) |
| { |
| return TREE_CODE (t) != SSA_NAME || has_zero_uses (t) || has_single_use (t); |
| } |
| |
| /* Return true if math operations should be canonicalized, |
| e.g. sqrt(sqrt(x)) -> pow(x, 0.25). */ |
| |
| static inline bool |
| canonicalize_math_p () |
| { |
| return !cfun || (cfun->curr_properties & PROP_gimple_opt_math) == 0; |
| } |
| |
| /* Return true if math operations that are beneficial only after |
| vectorization should be canonicalized. */ |
| |
| static inline bool |
| canonicalize_math_after_vectorization_p () |
| { |
| return !cfun || (cfun->curr_properties & PROP_gimple_lvec) != 0; |
| } |
| |
| /* Return true if pow(cst, x) should be optimized into exp(log(cst) * x). |
| As a workaround for SPEC CPU2017 628.pop2_s, don't do it if arg0 |
| is an exact integer, arg1 = phi_res +/- cst1 and phi_res = PHI <cst2, ...> |
| where cst2 +/- cst1 is an exact integer, because then pow (arg0, arg1) |
| will likely be exact, while exp (log (arg0) * arg1) might be not. |
| Also don't do it if arg1 is phi_res above and cst2 is an exact integer. */ |
| |
| static bool |
| optimize_pow_to_exp (tree arg0, tree arg1) |
| { |
| gcc_assert (TREE_CODE (arg0) == REAL_CST); |
| if (!real_isinteger (TREE_REAL_CST_PTR (arg0), TYPE_MODE (TREE_TYPE (arg0)))) |
| return true; |
| |
| if (TREE_CODE (arg1) != SSA_NAME) |
| return true; |
| |
| gimple *def = SSA_NAME_DEF_STMT (arg1); |
| gphi *phi = dyn_cast <gphi *> (def); |
| tree cst1 = NULL_TREE; |
| enum tree_code code = ERROR_MARK; |
| if (!phi) |
| { |
| if (!is_gimple_assign (def)) |
| return true; |
| code = gimple_assign_rhs_code (def); |
| switch (code) |
| { |
| case PLUS_EXPR: |
| case MINUS_EXPR: |
| break; |
| default: |
| return true; |
| } |
| if (TREE_CODE (gimple_assign_rhs1 (def)) != SSA_NAME |
| || TREE_CODE (gimple_assign_rhs2 (def)) != REAL_CST) |
| return true; |
| |
| cst1 = gimple_assign_rhs2 (def); |
| |
| phi = dyn_cast <gphi *> (SSA_NAME_DEF_STMT (gimple_assign_rhs1 (def))); |
| if (!phi) |
| return true; |
| } |
| |
| tree cst2 = NULL_TREE; |
| int n = gimple_phi_num_args (phi); |
| for (int i = 0; i < n; i++) |
| { |
| tree arg = PHI_ARG_DEF (phi, i); |
| if (TREE_CODE (arg) != REAL_CST) |
| continue; |
| else if (cst2 == NULL_TREE) |
| cst2 = arg; |
| else if (!operand_equal_p (cst2, arg, 0)) |
| return true; |
| } |
| |
| if (cst1 && cst2) |
| cst2 = const_binop (code, TREE_TYPE (cst2), cst2, cst1); |
| if (cst2 |
| && TREE_CODE (cst2) == REAL_CST |
| && real_isinteger (TREE_REAL_CST_PTR (cst2), |
| TYPE_MODE (TREE_TYPE (cst2)))) |
| return false; |
| return true; |
| } |
| |
| /* Return true if a division INNER_DIV / DIVISOR where INNER_DIV |
| is another division can be optimized. Don't optimize if INNER_DIV |
| is used in a TRUNC_MOD_EXPR with DIVISOR as second operand. */ |
| |
| static bool |
| optimize_successive_divisions_p (tree divisor, tree inner_div) |
| { |
| if (!gimple_in_ssa_p (cfun)) |
| return false; |
| |
| imm_use_iterator imm_iter; |
| use_operand_p use_p; |
| FOR_EACH_IMM_USE_FAST (use_p, imm_iter, inner_div) |
| { |
| gimple *use_stmt = USE_STMT (use_p); |
| if (!is_gimple_assign (use_stmt) |
| || gimple_assign_rhs_code (use_stmt) != TRUNC_MOD_EXPR |
| || !operand_equal_p (gimple_assign_rhs2 (use_stmt), divisor, 0)) |
| continue; |
| return false; |
| } |
| return true; |
| } |