| /* Emit RTL for the GCC expander. |
| Copyright (C) 1987-2017 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/>. */ |
| |
| |
| /* Middle-to-low level generation of rtx code and insns. |
| |
| This file contains support functions for creating rtl expressions |
| and manipulating them in the doubly-linked chain of insns. |
| |
| The patterns of the insns are created by machine-dependent |
| routines in insn-emit.c, which is generated automatically from |
| the machine description. These routines make the individual rtx's |
| of the pattern with `gen_rtx_fmt_ee' and others in genrtl.[ch], |
| which are automatically generated from rtl.def; what is machine |
| dependent is the kind of rtx's they make and what arguments they |
| use. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "memmodel.h" |
| #include "backend.h" |
| #include "target.h" |
| #include "rtl.h" |
| #include "tree.h" |
| #include "df.h" |
| #include "tm_p.h" |
| #include "stringpool.h" |
| #include "insn-config.h" |
| #include "regs.h" |
| #include "emit-rtl.h" |
| #include "recog.h" |
| #include "diagnostic-core.h" |
| #include "alias.h" |
| #include "fold-const.h" |
| #include "varasm.h" |
| #include "cfgrtl.h" |
| #include "tree-eh.h" |
| #include "explow.h" |
| #include "expr.h" |
| #include "params.h" |
| #include "builtins.h" |
| #include "rtl-iter.h" |
| #include "stor-layout.h" |
| #include "opts.h" |
| |
| struct target_rtl default_target_rtl; |
| #if SWITCHABLE_TARGET |
| struct target_rtl *this_target_rtl = &default_target_rtl; |
| #endif |
| |
| #define initial_regno_reg_rtx (this_target_rtl->x_initial_regno_reg_rtx) |
| |
| /* Commonly used modes. */ |
| |
| machine_mode byte_mode; /* Mode whose width is BITS_PER_UNIT. */ |
| machine_mode word_mode; /* Mode whose width is BITS_PER_WORD. */ |
| machine_mode double_mode; /* Mode whose width is DOUBLE_TYPE_SIZE. */ |
| machine_mode ptr_mode; /* Mode whose width is POINTER_SIZE. */ |
| |
| /* Datastructures maintained for currently processed function in RTL form. */ |
| |
| struct rtl_data x_rtl; |
| |
| /* Indexed by pseudo register number, gives the rtx for that pseudo. |
| Allocated in parallel with regno_pointer_align. |
| FIXME: We could put it into emit_status struct, but gengtype is not able to deal |
| with length attribute nested in top level structures. */ |
| |
| rtx * regno_reg_rtx; |
| |
| /* This is *not* reset after each function. It gives each CODE_LABEL |
| in the entire compilation a unique label number. */ |
| |
| static GTY(()) int label_num = 1; |
| |
| /* We record floating-point CONST_DOUBLEs in each floating-point mode for |
| the values of 0, 1, and 2. For the integer entries and VOIDmode, we |
| record a copy of const[012]_rtx and constm1_rtx. CONSTM1_RTX |
| is set only for MODE_INT and MODE_VECTOR_INT modes. */ |
| |
| rtx const_tiny_rtx[4][(int) MAX_MACHINE_MODE]; |
| |
| rtx const_true_rtx; |
| |
| REAL_VALUE_TYPE dconst0; |
| REAL_VALUE_TYPE dconst1; |
| REAL_VALUE_TYPE dconst2; |
| REAL_VALUE_TYPE dconstm1; |
| REAL_VALUE_TYPE dconsthalf; |
| |
| /* Record fixed-point constant 0 and 1. */ |
| FIXED_VALUE_TYPE fconst0[MAX_FCONST0]; |
| FIXED_VALUE_TYPE fconst1[MAX_FCONST1]; |
| |
| /* We make one copy of (const_int C) where C is in |
| [- MAX_SAVED_CONST_INT, MAX_SAVED_CONST_INT] |
| to save space during the compilation and simplify comparisons of |
| integers. */ |
| |
| rtx const_int_rtx[MAX_SAVED_CONST_INT * 2 + 1]; |
| |
| /* Standard pieces of rtx, to be substituted directly into things. */ |
| rtx pc_rtx; |
| rtx ret_rtx; |
| rtx simple_return_rtx; |
| rtx cc0_rtx; |
| |
| /* Marker used for denoting an INSN, which should never be accessed (i.e., |
| this pointer should normally never be dereferenced), but is required to be |
| distinct from NULL_RTX. Currently used by peephole2 pass. */ |
| rtx_insn *invalid_insn_rtx; |
| |
| /* A hash table storing CONST_INTs whose absolute value is greater |
| than MAX_SAVED_CONST_INT. */ |
| |
| struct const_int_hasher : ggc_cache_ptr_hash<rtx_def> |
| { |
| typedef HOST_WIDE_INT compare_type; |
| |
| static hashval_t hash (rtx i); |
| static bool equal (rtx i, HOST_WIDE_INT h); |
| }; |
| |
| static GTY ((cache)) hash_table<const_int_hasher> *const_int_htab; |
| |
| struct const_wide_int_hasher : ggc_cache_ptr_hash<rtx_def> |
| { |
| static hashval_t hash (rtx x); |
| static bool equal (rtx x, rtx y); |
| }; |
| |
| static GTY ((cache)) hash_table<const_wide_int_hasher> *const_wide_int_htab; |
| |
| /* A hash table storing register attribute structures. */ |
| struct reg_attr_hasher : ggc_cache_ptr_hash<reg_attrs> |
| { |
| static hashval_t hash (reg_attrs *x); |
| static bool equal (reg_attrs *a, reg_attrs *b); |
| }; |
| |
| static GTY ((cache)) hash_table<reg_attr_hasher> *reg_attrs_htab; |
| |
| /* A hash table storing all CONST_DOUBLEs. */ |
| struct const_double_hasher : ggc_cache_ptr_hash<rtx_def> |
| { |
| static hashval_t hash (rtx x); |
| static bool equal (rtx x, rtx y); |
| }; |
| |
| static GTY ((cache)) hash_table<const_double_hasher> *const_double_htab; |
| |
| /* A hash table storing all CONST_FIXEDs. */ |
| struct const_fixed_hasher : ggc_cache_ptr_hash<rtx_def> |
| { |
| static hashval_t hash (rtx x); |
| static bool equal (rtx x, rtx y); |
| }; |
| |
| static GTY ((cache)) hash_table<const_fixed_hasher> *const_fixed_htab; |
| |
| #define cur_insn_uid (crtl->emit.x_cur_insn_uid) |
| #define cur_debug_insn_uid (crtl->emit.x_cur_debug_insn_uid) |
| #define first_label_num (crtl->emit.x_first_label_num) |
| |
| static void set_used_decls (tree); |
| static void mark_label_nuses (rtx); |
| #if TARGET_SUPPORTS_WIDE_INT |
| static rtx lookup_const_wide_int (rtx); |
| #endif |
| static rtx lookup_const_double (rtx); |
| static rtx lookup_const_fixed (rtx); |
| static reg_attrs *get_reg_attrs (tree, int); |
| static rtx gen_const_vector (machine_mode, int); |
| static void copy_rtx_if_shared_1 (rtx *orig); |
| |
| /* Probability of the conditional branch currently proceeded by try_split. |
| Set to -1 otherwise. */ |
| int split_branch_probability = -1; |
| |
| /* Returns a hash code for X (which is a really a CONST_INT). */ |
| |
| hashval_t |
| const_int_hasher::hash (rtx x) |
| { |
| return (hashval_t) INTVAL (x); |
| } |
| |
| /* Returns nonzero if the value represented by X (which is really a |
| CONST_INT) is the same as that given by Y (which is really a |
| HOST_WIDE_INT *). */ |
| |
| bool |
| const_int_hasher::equal (rtx x, HOST_WIDE_INT y) |
| { |
| return (INTVAL (x) == y); |
| } |
| |
| #if TARGET_SUPPORTS_WIDE_INT |
| /* Returns a hash code for X (which is a really a CONST_WIDE_INT). */ |
| |
| hashval_t |
| const_wide_int_hasher::hash (rtx x) |
| { |
| int i; |
| unsigned HOST_WIDE_INT hash = 0; |
| const_rtx xr = x; |
| |
| for (i = 0; i < CONST_WIDE_INT_NUNITS (xr); i++) |
| hash += CONST_WIDE_INT_ELT (xr, i); |
| |
| return (hashval_t) hash; |
| } |
| |
| /* Returns nonzero if the value represented by X (which is really a |
| CONST_WIDE_INT) is the same as that given by Y (which is really a |
| CONST_WIDE_INT). */ |
| |
| bool |
| const_wide_int_hasher::equal (rtx x, rtx y) |
| { |
| int i; |
| const_rtx xr = x; |
| const_rtx yr = y; |
| if (CONST_WIDE_INT_NUNITS (xr) != CONST_WIDE_INT_NUNITS (yr)) |
| return false; |
| |
| for (i = 0; i < CONST_WIDE_INT_NUNITS (xr); i++) |
| if (CONST_WIDE_INT_ELT (xr, i) != CONST_WIDE_INT_ELT (yr, i)) |
| return false; |
| |
| return true; |
| } |
| #endif |
| |
| /* Returns a hash code for X (which is really a CONST_DOUBLE). */ |
| hashval_t |
| const_double_hasher::hash (rtx x) |
| { |
| const_rtx const value = x; |
| hashval_t h; |
| |
| if (TARGET_SUPPORTS_WIDE_INT == 0 && GET_MODE (value) == VOIDmode) |
| h = CONST_DOUBLE_LOW (value) ^ CONST_DOUBLE_HIGH (value); |
| else |
| { |
| h = real_hash (CONST_DOUBLE_REAL_VALUE (value)); |
| /* MODE is used in the comparison, so it should be in the hash. */ |
| h ^= GET_MODE (value); |
| } |
| return h; |
| } |
| |
| /* Returns nonzero if the value represented by X (really a ...) |
| is the same as that represented by Y (really a ...) */ |
| bool |
| const_double_hasher::equal (rtx x, rtx y) |
| { |
| const_rtx const a = x, b = y; |
| |
| if (GET_MODE (a) != GET_MODE (b)) |
| return 0; |
| if (TARGET_SUPPORTS_WIDE_INT == 0 && GET_MODE (a) == VOIDmode) |
| return (CONST_DOUBLE_LOW (a) == CONST_DOUBLE_LOW (b) |
| && CONST_DOUBLE_HIGH (a) == CONST_DOUBLE_HIGH (b)); |
| else |
| return real_identical (CONST_DOUBLE_REAL_VALUE (a), |
| CONST_DOUBLE_REAL_VALUE (b)); |
| } |
| |
| /* Returns a hash code for X (which is really a CONST_FIXED). */ |
| |
| hashval_t |
| const_fixed_hasher::hash (rtx x) |
| { |
| const_rtx const value = x; |
| hashval_t h; |
| |
| h = fixed_hash (CONST_FIXED_VALUE (value)); |
| /* MODE is used in the comparison, so it should be in the hash. */ |
| h ^= GET_MODE (value); |
| return h; |
| } |
| |
| /* Returns nonzero if the value represented by X is the same as that |
| represented by Y. */ |
| |
| bool |
| const_fixed_hasher::equal (rtx x, rtx y) |
| { |
| const_rtx const a = x, b = y; |
| |
| if (GET_MODE (a) != GET_MODE (b)) |
| return 0; |
| return fixed_identical (CONST_FIXED_VALUE (a), CONST_FIXED_VALUE (b)); |
| } |
| |
| /* Return true if the given memory attributes are equal. */ |
| |
| bool |
| mem_attrs_eq_p (const struct mem_attrs *p, const struct mem_attrs *q) |
| { |
| if (p == q) |
| return true; |
| if (!p || !q) |
| return false; |
| return (p->alias == q->alias |
| && p->offset_known_p == q->offset_known_p |
| && (!p->offset_known_p || p->offset == q->offset) |
| && p->size_known_p == q->size_known_p |
| && (!p->size_known_p || p->size == q->size) |
| && p->align == q->align |
| && p->addrspace == q->addrspace |
| && (p->expr == q->expr |
| || (p->expr != NULL_TREE && q->expr != NULL_TREE |
| && operand_equal_p (p->expr, q->expr, 0)))); |
| } |
| |
| /* Set MEM's memory attributes so that they are the same as ATTRS. */ |
| |
| static void |
| set_mem_attrs (rtx mem, mem_attrs *attrs) |
| { |
| /* If everything is the default, we can just clear the attributes. */ |
| if (mem_attrs_eq_p (attrs, mode_mem_attrs[(int) GET_MODE (mem)])) |
| { |
| MEM_ATTRS (mem) = 0; |
| return; |
| } |
| |
| if (!MEM_ATTRS (mem) |
| || !mem_attrs_eq_p (attrs, MEM_ATTRS (mem))) |
| { |
| MEM_ATTRS (mem) = ggc_alloc<mem_attrs> (); |
| memcpy (MEM_ATTRS (mem), attrs, sizeof (mem_attrs)); |
| } |
| } |
| |
| /* Returns a hash code for X (which is a really a reg_attrs *). */ |
| |
| hashval_t |
| reg_attr_hasher::hash (reg_attrs *x) |
| { |
| const reg_attrs *const p = x; |
| |
| return ((p->offset * 1000) ^ (intptr_t) p->decl); |
| } |
| |
| /* Returns nonzero if the value represented by X is the same as that given by |
| Y. */ |
| |
| bool |
| reg_attr_hasher::equal (reg_attrs *x, reg_attrs *y) |
| { |
| const reg_attrs *const p = x; |
| const reg_attrs *const q = y; |
| |
| return (p->decl == q->decl && p->offset == q->offset); |
| } |
| /* Allocate a new reg_attrs structure and insert it into the hash table if |
| one identical to it is not already in the table. We are doing this for |
| MEM of mode MODE. */ |
| |
| static reg_attrs * |
| get_reg_attrs (tree decl, int offset) |
| { |
| reg_attrs attrs; |
| |
| /* If everything is the default, we can just return zero. */ |
| if (decl == 0 && offset == 0) |
| return 0; |
| |
| attrs.decl = decl; |
| attrs.offset = offset; |
| |
| reg_attrs **slot = reg_attrs_htab->find_slot (&attrs, INSERT); |
| if (*slot == 0) |
| { |
| *slot = ggc_alloc<reg_attrs> (); |
| memcpy (*slot, &attrs, sizeof (reg_attrs)); |
| } |
| |
| return *slot; |
| } |
| |
| |
| #if !HAVE_blockage |
| /* Generate an empty ASM_INPUT, which is used to block attempts to schedule, |
| and to block register equivalences to be seen across this insn. */ |
| |
| rtx |
| gen_blockage (void) |
| { |
| rtx x = gen_rtx_ASM_INPUT (VOIDmode, ""); |
| MEM_VOLATILE_P (x) = true; |
| return x; |
| } |
| #endif |
| |
| |
| /* Set the mode and register number of X to MODE and REGNO. */ |
| |
| void |
| set_mode_and_regno (rtx x, machine_mode mode, unsigned int regno) |
| { |
| unsigned int nregs = (HARD_REGISTER_NUM_P (regno) |
| ? hard_regno_nregs[regno][mode] |
| : 1); |
| PUT_MODE_RAW (x, mode); |
| set_regno_raw (x, regno, nregs); |
| } |
| |
| /* Generate a new REG rtx. Make sure ORIGINAL_REGNO is set properly, and |
| don't attempt to share with the various global pieces of rtl (such as |
| frame_pointer_rtx). */ |
| |
| rtx |
| gen_raw_REG (machine_mode mode, unsigned int regno) |
| { |
| rtx x = rtx_alloc_stat (REG MEM_STAT_INFO); |
| set_mode_and_regno (x, mode, regno); |
| REG_ATTRS (x) = NULL; |
| ORIGINAL_REGNO (x) = regno; |
| return x; |
| } |
| |
| /* There are some RTL codes that require special attention; the generation |
| functions do the raw handling. If you add to this list, modify |
| special_rtx in gengenrtl.c as well. */ |
| |
| rtx_expr_list * |
| gen_rtx_EXPR_LIST (machine_mode mode, rtx expr, rtx expr_list) |
| { |
| return as_a <rtx_expr_list *> (gen_rtx_fmt_ee (EXPR_LIST, mode, expr, |
| expr_list)); |
| } |
| |
| rtx_insn_list * |
| gen_rtx_INSN_LIST (machine_mode mode, rtx insn, rtx insn_list) |
| { |
| return as_a <rtx_insn_list *> (gen_rtx_fmt_ue (INSN_LIST, mode, insn, |
| insn_list)); |
| } |
| |
| rtx_insn * |
| gen_rtx_INSN (machine_mode mode, rtx_insn *prev_insn, rtx_insn *next_insn, |
| basic_block bb, rtx pattern, int location, int code, |
| rtx reg_notes) |
| { |
| return as_a <rtx_insn *> (gen_rtx_fmt_uuBeiie (INSN, mode, |
| prev_insn, next_insn, |
| bb, pattern, location, code, |
| reg_notes)); |
| } |
| |
| rtx |
| gen_rtx_CONST_INT (machine_mode mode ATTRIBUTE_UNUSED, HOST_WIDE_INT arg) |
| { |
| if (arg >= - MAX_SAVED_CONST_INT && arg <= MAX_SAVED_CONST_INT) |
| return const_int_rtx[arg + MAX_SAVED_CONST_INT]; |
| |
| #if STORE_FLAG_VALUE != 1 && STORE_FLAG_VALUE != -1 |
| if (const_true_rtx && arg == STORE_FLAG_VALUE) |
| return const_true_rtx; |
| #endif |
| |
| /* Look up the CONST_INT in the hash table. */ |
| rtx *slot = const_int_htab->find_slot_with_hash (arg, (hashval_t) arg, |
| INSERT); |
| if (*slot == 0) |
| *slot = gen_rtx_raw_CONST_INT (VOIDmode, arg); |
| |
| return *slot; |
| } |
| |
| rtx |
| gen_int_mode (HOST_WIDE_INT c, machine_mode mode) |
| { |
| return GEN_INT (trunc_int_for_mode (c, mode)); |
| } |
| |
| /* CONST_DOUBLEs might be created from pairs of integers, or from |
| REAL_VALUE_TYPEs. Also, their length is known only at run time, |
| so we cannot use gen_rtx_raw_CONST_DOUBLE. */ |
| |
| /* Determine whether REAL, a CONST_DOUBLE, already exists in the |
| hash table. If so, return its counterpart; otherwise add it |
| to the hash table and return it. */ |
| static rtx |
| lookup_const_double (rtx real) |
| { |
| rtx *slot = const_double_htab->find_slot (real, INSERT); |
| if (*slot == 0) |
| *slot = real; |
| |
| return *slot; |
| } |
| |
| /* Return a CONST_DOUBLE rtx for a floating-point value specified by |
| VALUE in mode MODE. */ |
| rtx |
| const_double_from_real_value (REAL_VALUE_TYPE value, machine_mode mode) |
| { |
| rtx real = rtx_alloc (CONST_DOUBLE); |
| PUT_MODE (real, mode); |
| |
| real->u.rv = value; |
| |
| return lookup_const_double (real); |
| } |
| |
| /* Determine whether FIXED, a CONST_FIXED, already exists in the |
| hash table. If so, return its counterpart; otherwise add it |
| to the hash table and return it. */ |
| |
| static rtx |
| lookup_const_fixed (rtx fixed) |
| { |
| rtx *slot = const_fixed_htab->find_slot (fixed, INSERT); |
| if (*slot == 0) |
| *slot = fixed; |
| |
| return *slot; |
| } |
| |
| /* Return a CONST_FIXED rtx for a fixed-point value specified by |
| VALUE in mode MODE. */ |
| |
| rtx |
| const_fixed_from_fixed_value (FIXED_VALUE_TYPE value, machine_mode mode) |
| { |
| rtx fixed = rtx_alloc (CONST_FIXED); |
| PUT_MODE (fixed, mode); |
| |
| fixed->u.fv = value; |
| |
| return lookup_const_fixed (fixed); |
| } |
| |
| #if TARGET_SUPPORTS_WIDE_INT == 0 |
| /* Constructs double_int from rtx CST. */ |
| |
| double_int |
| rtx_to_double_int (const_rtx cst) |
| { |
| double_int r; |
| |
| if (CONST_INT_P (cst)) |
| r = double_int::from_shwi (INTVAL (cst)); |
| else if (CONST_DOUBLE_AS_INT_P (cst)) |
| { |
| r.low = CONST_DOUBLE_LOW (cst); |
| r.high = CONST_DOUBLE_HIGH (cst); |
| } |
| else |
| gcc_unreachable (); |
| |
| return r; |
| } |
| #endif |
| |
| #if TARGET_SUPPORTS_WIDE_INT |
| /* Determine whether CONST_WIDE_INT WINT already exists in the hash table. |
| If so, return its counterpart; otherwise add it to the hash table and |
| return it. */ |
| |
| static rtx |
| lookup_const_wide_int (rtx wint) |
| { |
| rtx *slot = const_wide_int_htab->find_slot (wint, INSERT); |
| if (*slot == 0) |
| *slot = wint; |
| |
| return *slot; |
| } |
| #endif |
| |
| /* Return an rtx constant for V, given that the constant has mode MODE. |
| The returned rtx will be a CONST_INT if V fits, otherwise it will be |
| a CONST_DOUBLE (if !TARGET_SUPPORTS_WIDE_INT) or a CONST_WIDE_INT |
| (if TARGET_SUPPORTS_WIDE_INT). */ |
| |
| rtx |
| immed_wide_int_const (const wide_int_ref &v, machine_mode mode) |
| { |
| unsigned int len = v.get_len (); |
| unsigned int prec = GET_MODE_PRECISION (mode); |
| |
| /* Allow truncation but not extension since we do not know if the |
| number is signed or unsigned. */ |
| gcc_assert (prec <= v.get_precision ()); |
| |
| if (len < 2 || prec <= HOST_BITS_PER_WIDE_INT) |
| return gen_int_mode (v.elt (0), mode); |
| |
| #if TARGET_SUPPORTS_WIDE_INT |
| { |
| unsigned int i; |
| rtx value; |
| unsigned int blocks_needed |
| = (prec + HOST_BITS_PER_WIDE_INT - 1) / HOST_BITS_PER_WIDE_INT; |
| |
| if (len > blocks_needed) |
| len = blocks_needed; |
| |
| value = const_wide_int_alloc (len); |
| |
| /* It is so tempting to just put the mode in here. Must control |
| myself ... */ |
| PUT_MODE (value, VOIDmode); |
| CWI_PUT_NUM_ELEM (value, len); |
| |
| for (i = 0; i < len; i++) |
| CONST_WIDE_INT_ELT (value, i) = v.elt (i); |
| |
| return lookup_const_wide_int (value); |
| } |
| #else |
| return immed_double_const (v.elt (0), v.elt (1), mode); |
| #endif |
| } |
| |
| #if TARGET_SUPPORTS_WIDE_INT == 0 |
| /* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair |
| of ints: I0 is the low-order word and I1 is the high-order word. |
| For values that are larger than HOST_BITS_PER_DOUBLE_INT, the |
| implied upper bits are copies of the high bit of i1. The value |
| itself is neither signed nor unsigned. Do not use this routine for |
| non-integer modes; convert to REAL_VALUE_TYPE and use |
| const_double_from_real_value. */ |
| |
| rtx |
| immed_double_const (HOST_WIDE_INT i0, HOST_WIDE_INT i1, machine_mode mode) |
| { |
| rtx value; |
| unsigned int i; |
| |
| /* There are the following cases (note that there are no modes with |
| HOST_BITS_PER_WIDE_INT < GET_MODE_BITSIZE (mode) < HOST_BITS_PER_DOUBLE_INT): |
| |
| 1) If GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT, then we use |
| gen_int_mode. |
| 2) If the value of the integer fits into HOST_WIDE_INT anyway |
| (i.e., i1 consists only from copies of the sign bit, and sign |
| of i0 and i1 are the same), then we return a CONST_INT for i0. |
| 3) Otherwise, we create a CONST_DOUBLE for i0 and i1. */ |
| if (mode != VOIDmode) |
| { |
| gcc_assert (GET_MODE_CLASS (mode) == MODE_INT |
| || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT |
| /* We can get a 0 for an error mark. */ |
| || GET_MODE_CLASS (mode) == MODE_VECTOR_INT |
| || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT |
| || GET_MODE_CLASS (mode) == MODE_POINTER_BOUNDS); |
| |
| if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT) |
| return gen_int_mode (i0, mode); |
| } |
| |
| /* If this integer fits in one word, return a CONST_INT. */ |
| if ((i1 == 0 && i0 >= 0) || (i1 == ~0 && i0 < 0)) |
| return GEN_INT (i0); |
| |
| /* We use VOIDmode for integers. */ |
| value = rtx_alloc (CONST_DOUBLE); |
| PUT_MODE (value, VOIDmode); |
| |
| CONST_DOUBLE_LOW (value) = i0; |
| CONST_DOUBLE_HIGH (value) = i1; |
| |
| for (i = 2; i < (sizeof CONST_DOUBLE_FORMAT - 1); i++) |
| XWINT (value, i) = 0; |
| |
| return lookup_const_double (value); |
| } |
| #endif |
| |
| rtx |
| gen_rtx_REG (machine_mode mode, unsigned int regno) |
| { |
| /* In case the MD file explicitly references the frame pointer, have |
| all such references point to the same frame pointer. This is |
| used during frame pointer elimination to distinguish the explicit |
| references to these registers from pseudos that happened to be |
| assigned to them. |
| |
| If we have eliminated the frame pointer or arg pointer, we will |
| be using it as a normal register, for example as a spill |
| register. In such cases, we might be accessing it in a mode that |
| is not Pmode and therefore cannot use the pre-allocated rtx. |
| |
| Also don't do this when we are making new REGs in reload, since |
| we don't want to get confused with the real pointers. */ |
| |
| if (mode == Pmode && !reload_in_progress && !lra_in_progress) |
| { |
| if (regno == FRAME_POINTER_REGNUM |
| && (!reload_completed || frame_pointer_needed)) |
| return frame_pointer_rtx; |
| |
| if (!HARD_FRAME_POINTER_IS_FRAME_POINTER |
| && regno == HARD_FRAME_POINTER_REGNUM |
| && (!reload_completed || frame_pointer_needed)) |
| return hard_frame_pointer_rtx; |
| #if !HARD_FRAME_POINTER_IS_ARG_POINTER |
| if (FRAME_POINTER_REGNUM != ARG_POINTER_REGNUM |
| && regno == ARG_POINTER_REGNUM) |
| return arg_pointer_rtx; |
| #endif |
| #ifdef RETURN_ADDRESS_POINTER_REGNUM |
| if (regno == RETURN_ADDRESS_POINTER_REGNUM) |
| return return_address_pointer_rtx; |
| #endif |
| if (regno == (unsigned) PIC_OFFSET_TABLE_REGNUM |
| && PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM |
| && fixed_regs[PIC_OFFSET_TABLE_REGNUM]) |
| return pic_offset_table_rtx; |
| if (regno == STACK_POINTER_REGNUM) |
| return stack_pointer_rtx; |
| } |
| |
| #if 0 |
| /* If the per-function register table has been set up, try to re-use |
| an existing entry in that table to avoid useless generation of RTL. |
| |
| This code is disabled for now until we can fix the various backends |
| which depend on having non-shared hard registers in some cases. Long |
| term we want to re-enable this code as it can significantly cut down |
| on the amount of useless RTL that gets generated. |
| |
| We'll also need to fix some code that runs after reload that wants to |
| set ORIGINAL_REGNO. */ |
| |
| if (cfun |
| && cfun->emit |
| && regno_reg_rtx |
| && regno < FIRST_PSEUDO_REGISTER |
| && reg_raw_mode[regno] == mode) |
| return regno_reg_rtx[regno]; |
| #endif |
| |
| return gen_raw_REG (mode, regno); |
| } |
| |
| rtx |
| gen_rtx_MEM (machine_mode mode, rtx addr) |
| { |
| rtx rt = gen_rtx_raw_MEM (mode, addr); |
| |
| /* This field is not cleared by the mere allocation of the rtx, so |
| we clear it here. */ |
| MEM_ATTRS (rt) = 0; |
| |
| return rt; |
| } |
| |
| /* Generate a memory referring to non-trapping constant memory. */ |
| |
| rtx |
| gen_const_mem (machine_mode mode, rtx addr) |
| { |
| rtx mem = gen_rtx_MEM (mode, addr); |
| MEM_READONLY_P (mem) = 1; |
| MEM_NOTRAP_P (mem) = 1; |
| return mem; |
| } |
| |
| /* Generate a MEM referring to fixed portions of the frame, e.g., register |
| save areas. */ |
| |
| rtx |
| gen_frame_mem (machine_mode mode, rtx addr) |
| { |
| rtx mem = gen_rtx_MEM (mode, addr); |
| MEM_NOTRAP_P (mem) = 1; |
| set_mem_alias_set (mem, get_frame_alias_set ()); |
| return mem; |
| } |
| |
| /* Generate a MEM referring to a temporary use of the stack, not part |
| of the fixed stack frame. For example, something which is pushed |
| by a target splitter. */ |
| rtx |
| gen_tmp_stack_mem (machine_mode mode, rtx addr) |
| { |
| rtx mem = gen_rtx_MEM (mode, addr); |
| MEM_NOTRAP_P (mem) = 1; |
| if (!cfun->calls_alloca) |
| set_mem_alias_set (mem, get_frame_alias_set ()); |
| return mem; |
| } |
| |
| /* We want to create (subreg:OMODE (obj:IMODE) OFFSET). Return true if |
| this construct would be valid, and false otherwise. */ |
| |
| bool |
| validate_subreg (machine_mode omode, machine_mode imode, |
| const_rtx reg, unsigned int offset) |
| { |
| unsigned int isize = GET_MODE_SIZE (imode); |
| unsigned int osize = GET_MODE_SIZE (omode); |
| |
| /* All subregs must be aligned. */ |
| if (offset % osize != 0) |
| return false; |
| |
| /* The subreg offset cannot be outside the inner object. */ |
| if (offset >= isize) |
| return false; |
| |
| /* ??? This should not be here. Temporarily continue to allow word_mode |
| subregs of anything. The most common offender is (subreg:SI (reg:DF)). |
| Generally, backends are doing something sketchy but it'll take time to |
| fix them all. */ |
| if (omode == word_mode) |
| ; |
| /* ??? Similarly, e.g. with (subreg:DF (reg:TI)). Though store_bit_field |
| is the culprit here, and not the backends. */ |
| else if (osize >= UNITS_PER_WORD && isize >= osize) |
| ; |
| /* Allow component subregs of complex and vector. Though given the below |
| extraction rules, it's not always clear what that means. */ |
| else if ((COMPLEX_MODE_P (imode) || VECTOR_MODE_P (imode)) |
| && GET_MODE_INNER (imode) == omode) |
| ; |
| /* ??? x86 sse code makes heavy use of *paradoxical* vector subregs, |
| i.e. (subreg:V4SF (reg:SF) 0). This surely isn't the cleanest way to |
| represent this. It's questionable if this ought to be represented at |
| all -- why can't this all be hidden in post-reload splitters that make |
| arbitrarily mode changes to the registers themselves. */ |
| else if (VECTOR_MODE_P (omode) && GET_MODE_INNER (omode) == imode) |
| ; |
| /* Subregs involving floating point modes are not allowed to |
| change size. Therefore (subreg:DI (reg:DF) 0) is fine, but |
| (subreg:SI (reg:DF) 0) isn't. */ |
| else if (FLOAT_MODE_P (imode) || FLOAT_MODE_P (omode)) |
| { |
| if (! (isize == osize |
| /* LRA can use subreg to store a floating point value in |
| an integer mode. Although the floating point and the |
| integer modes need the same number of hard registers, |
| the size of floating point mode can be less than the |
| integer mode. LRA also uses subregs for a register |
| should be used in different mode in on insn. */ |
| || lra_in_progress)) |
| return false; |
| } |
| |
| /* Paradoxical subregs must have offset zero. */ |
| if (osize > isize) |
| return offset == 0; |
| |
| /* This is a normal subreg. Verify that the offset is representable. */ |
| |
| /* For hard registers, we already have most of these rules collected in |
| subreg_offset_representable_p. */ |
| if (reg && REG_P (reg) && HARD_REGISTER_P (reg)) |
| { |
| unsigned int regno = REGNO (reg); |
| |
| #ifdef CANNOT_CHANGE_MODE_CLASS |
| if ((COMPLEX_MODE_P (imode) || VECTOR_MODE_P (imode)) |
| && GET_MODE_INNER (imode) == omode) |
| ; |
| else if (REG_CANNOT_CHANGE_MODE_P (regno, imode, omode)) |
| return false; |
| #endif |
| |
| return subreg_offset_representable_p (regno, imode, offset, omode); |
| } |
| |
| /* For pseudo registers, we want most of the same checks. Namely: |
| If the register no larger than a word, the subreg must be lowpart. |
| If the register is larger than a word, the subreg must be the lowpart |
| of a subword. A subreg does *not* perform arbitrary bit extraction. |
| Given that we've already checked mode/offset alignment, we only have |
| to check subword subregs here. */ |
| if (osize < UNITS_PER_WORD |
| && ! (lra_in_progress && (FLOAT_MODE_P (imode) || FLOAT_MODE_P (omode)))) |
| { |
| machine_mode wmode = isize > UNITS_PER_WORD ? word_mode : imode; |
| unsigned int low_off = subreg_lowpart_offset (omode, wmode); |
| if (offset % UNITS_PER_WORD != low_off) |
| return false; |
| } |
| return true; |
| } |
| |
| rtx |
| gen_rtx_SUBREG (machine_mode mode, rtx reg, int offset) |
| { |
| gcc_assert (validate_subreg (mode, GET_MODE (reg), reg, offset)); |
| return gen_rtx_raw_SUBREG (mode, reg, offset); |
| } |
| |
| /* Generate a SUBREG representing the least-significant part of REG if MODE |
| is smaller than mode of REG, otherwise paradoxical SUBREG. */ |
| |
| rtx |
| gen_lowpart_SUBREG (machine_mode mode, rtx reg) |
| { |
| machine_mode inmode; |
| |
| inmode = GET_MODE (reg); |
| if (inmode == VOIDmode) |
| inmode = mode; |
| return gen_rtx_SUBREG (mode, reg, |
| subreg_lowpart_offset (mode, inmode)); |
| } |
| |
| rtx |
| gen_rtx_VAR_LOCATION (machine_mode mode, tree decl, rtx loc, |
| enum var_init_status status) |
| { |
| rtx x = gen_rtx_fmt_te (VAR_LOCATION, mode, decl, loc); |
| PAT_VAR_LOCATION_STATUS (x) = status; |
| return x; |
| } |
| |
| |
| /* Create an rtvec and stores within it the RTXen passed in the arguments. */ |
| |
| rtvec |
| gen_rtvec (int n, ...) |
| { |
| int i; |
| rtvec rt_val; |
| va_list p; |
| |
| va_start (p, n); |
| |
| /* Don't allocate an empty rtvec... */ |
| if (n == 0) |
| { |
| va_end (p); |
| return NULL_RTVEC; |
| } |
| |
| rt_val = rtvec_alloc (n); |
| |
| for (i = 0; i < n; i++) |
| rt_val->elem[i] = va_arg (p, rtx); |
| |
| va_end (p); |
| return rt_val; |
| } |
| |
| rtvec |
| gen_rtvec_v (int n, rtx *argp) |
| { |
| int i; |
| rtvec rt_val; |
| |
| /* Don't allocate an empty rtvec... */ |
| if (n == 0) |
| return NULL_RTVEC; |
| |
| rt_val = rtvec_alloc (n); |
| |
| for (i = 0; i < n; i++) |
| rt_val->elem[i] = *argp++; |
| |
| return rt_val; |
| } |
| |
| rtvec |
| gen_rtvec_v (int n, rtx_insn **argp) |
| { |
| int i; |
| rtvec rt_val; |
| |
| /* Don't allocate an empty rtvec... */ |
| if (n == 0) |
| return NULL_RTVEC; |
| |
| rt_val = rtvec_alloc (n); |
| |
| for (i = 0; i < n; i++) |
| rt_val->elem[i] = *argp++; |
| |
| return rt_val; |
| } |
| |
| |
| /* Return the number of bytes between the start of an OUTER_MODE |
| in-memory value and the start of an INNER_MODE in-memory value, |
| given that the former is a lowpart of the latter. It may be a |
| paradoxical lowpart, in which case the offset will be negative |
| on big-endian targets. */ |
| |
| int |
| byte_lowpart_offset (machine_mode outer_mode, |
| machine_mode inner_mode) |
| { |
| if (GET_MODE_SIZE (outer_mode) < GET_MODE_SIZE (inner_mode)) |
| return subreg_lowpart_offset (outer_mode, inner_mode); |
| else |
| return -subreg_lowpart_offset (inner_mode, outer_mode); |
| } |
| |
| /* Generate a REG rtx for a new pseudo register of mode MODE. |
| This pseudo is assigned the next sequential register number. */ |
| |
| rtx |
| gen_reg_rtx (machine_mode mode) |
| { |
| rtx val; |
| unsigned int align = GET_MODE_ALIGNMENT (mode); |
| |
| gcc_assert (can_create_pseudo_p ()); |
| |
| /* If a virtual register with bigger mode alignment is generated, |
| increase stack alignment estimation because it might be spilled |
| to stack later. */ |
| if (SUPPORTS_STACK_ALIGNMENT |
| && crtl->stack_alignment_estimated < align |
| && !crtl->stack_realign_processed) |
| { |
| unsigned int min_align = MINIMUM_ALIGNMENT (NULL, mode, align); |
| if (crtl->stack_alignment_estimated < min_align) |
| crtl->stack_alignment_estimated = min_align; |
| } |
| |
| if (generating_concat_p |
| && (GET_MODE_CLASS (mode) == MODE_COMPLEX_FLOAT |
| || GET_MODE_CLASS (mode) == MODE_COMPLEX_INT)) |
| { |
| /* For complex modes, don't make a single pseudo. |
| Instead, make a CONCAT of two pseudos. |
| This allows noncontiguous allocation of the real and imaginary parts, |
| which makes much better code. Besides, allocating DCmode |
| pseudos overstrains reload on some machines like the 386. */ |
| rtx realpart, imagpart; |
| machine_mode partmode = GET_MODE_INNER (mode); |
| |
| realpart = gen_reg_rtx (partmode); |
| imagpart = gen_reg_rtx (partmode); |
| return gen_rtx_CONCAT (mode, realpart, imagpart); |
| } |
| |
| /* Do not call gen_reg_rtx with uninitialized crtl. */ |
| gcc_assert (crtl->emit.regno_pointer_align_length); |
| |
| crtl->emit.ensure_regno_capacity (); |
| gcc_assert (reg_rtx_no < crtl->emit.regno_pointer_align_length); |
| |
| val = gen_raw_REG (mode, reg_rtx_no); |
| regno_reg_rtx[reg_rtx_no++] = val; |
| return val; |
| } |
| |
| /* Make sure m_regno_pointer_align, and regno_reg_rtx are large |
| enough to have elements in the range 0 <= idx <= reg_rtx_no. */ |
| |
| void |
| emit_status::ensure_regno_capacity () |
| { |
| int old_size = regno_pointer_align_length; |
| |
| if (reg_rtx_no < old_size) |
| return; |
| |
| int new_size = old_size * 2; |
| while (reg_rtx_no >= new_size) |
| new_size *= 2; |
| |
| char *tmp = XRESIZEVEC (char, regno_pointer_align, new_size); |
| memset (tmp + old_size, 0, new_size - old_size); |
| regno_pointer_align = (unsigned char *) tmp; |
| |
| rtx *new1 = GGC_RESIZEVEC (rtx, regno_reg_rtx, new_size); |
| memset (new1 + old_size, 0, (new_size - old_size) * sizeof (rtx)); |
| regno_reg_rtx = new1; |
| |
| crtl->emit.regno_pointer_align_length = new_size; |
| } |
| |
| /* Return TRUE if REG is a PARM_DECL, FALSE otherwise. */ |
| |
| bool |
| reg_is_parm_p (rtx reg) |
| { |
| tree decl; |
| |
| gcc_assert (REG_P (reg)); |
| decl = REG_EXPR (reg); |
| return (decl && TREE_CODE (decl) == PARM_DECL); |
| } |
| |
| /* Update NEW with the same attributes as REG, but with OFFSET added |
| to the REG_OFFSET. */ |
| |
| static void |
| update_reg_offset (rtx new_rtx, rtx reg, int offset) |
| { |
| REG_ATTRS (new_rtx) = get_reg_attrs (REG_EXPR (reg), |
| REG_OFFSET (reg) + offset); |
| } |
| |
| /* Generate a register with same attributes as REG, but with OFFSET |
| added to the REG_OFFSET. */ |
| |
| rtx |
| gen_rtx_REG_offset (rtx reg, machine_mode mode, unsigned int regno, |
| int offset) |
| { |
| rtx new_rtx = gen_rtx_REG (mode, regno); |
| |
| update_reg_offset (new_rtx, reg, offset); |
| return new_rtx; |
| } |
| |
| /* Generate a new pseudo-register with the same attributes as REG, but |
| with OFFSET added to the REG_OFFSET. */ |
| |
| rtx |
| gen_reg_rtx_offset (rtx reg, machine_mode mode, int offset) |
| { |
| rtx new_rtx = gen_reg_rtx (mode); |
| |
| update_reg_offset (new_rtx, reg, offset); |
| return new_rtx; |
| } |
| |
| /* Adjust REG in-place so that it has mode MODE. It is assumed that the |
| new register is a (possibly paradoxical) lowpart of the old one. */ |
| |
| void |
| adjust_reg_mode (rtx reg, machine_mode mode) |
| { |
| update_reg_offset (reg, reg, byte_lowpart_offset (mode, GET_MODE (reg))); |
| PUT_MODE (reg, mode); |
| } |
| |
| /* Copy REG's attributes from X, if X has any attributes. If REG and X |
| have different modes, REG is a (possibly paradoxical) lowpart of X. */ |
| |
| void |
| set_reg_attrs_from_value (rtx reg, rtx x) |
| { |
| int offset; |
| bool can_be_reg_pointer = true; |
| |
| /* Don't call mark_reg_pointer for incompatible pointer sign |
| extension. */ |
| while (GET_CODE (x) == SIGN_EXTEND |
| || GET_CODE (x) == ZERO_EXTEND |
| || GET_CODE (x) == TRUNCATE |
| || (GET_CODE (x) == SUBREG && subreg_lowpart_p (x))) |
| { |
| #if defined(POINTERS_EXTEND_UNSIGNED) |
| if (((GET_CODE (x) == SIGN_EXTEND && POINTERS_EXTEND_UNSIGNED) |
| || (GET_CODE (x) == ZERO_EXTEND && ! POINTERS_EXTEND_UNSIGNED) |
| || (paradoxical_subreg_p (x) |
| && ! (SUBREG_PROMOTED_VAR_P (x) |
| && SUBREG_CHECK_PROMOTED_SIGN (x, |
| POINTERS_EXTEND_UNSIGNED)))) |
| && !targetm.have_ptr_extend ()) |
| can_be_reg_pointer = false; |
| #endif |
| x = XEXP (x, 0); |
| } |
| |
| /* Hard registers can be reused for multiple purposes within the same |
| function, so setting REG_ATTRS, REG_POINTER and REG_POINTER_ALIGN |
| on them is wrong. */ |
| if (HARD_REGISTER_P (reg)) |
| return; |
| |
| offset = byte_lowpart_offset (GET_MODE (reg), GET_MODE (x)); |
| if (MEM_P (x)) |
| { |
| if (MEM_OFFSET_KNOWN_P (x)) |
| REG_ATTRS (reg) = get_reg_attrs (MEM_EXPR (x), |
| MEM_OFFSET (x) + offset); |
| if (can_be_reg_pointer && MEM_POINTER (x)) |
| mark_reg_pointer (reg, 0); |
| } |
| else if (REG_P (x)) |
| { |
| if (REG_ATTRS (x)) |
| update_reg_offset (reg, x, offset); |
| if (can_be_reg_pointer && REG_POINTER (x)) |
| mark_reg_pointer (reg, REGNO_POINTER_ALIGN (REGNO (x))); |
| } |
| } |
| |
| /* Generate a REG rtx for a new pseudo register, copying the mode |
| and attributes from X. */ |
| |
| rtx |
| gen_reg_rtx_and_attrs (rtx x) |
| { |
| rtx reg = gen_reg_rtx (GET_MODE (x)); |
| set_reg_attrs_from_value (reg, x); |
| return reg; |
| } |
| |
| /* Set the register attributes for registers contained in PARM_RTX. |
| Use needed values from memory attributes of MEM. */ |
| |
| void |
| set_reg_attrs_for_parm (rtx parm_rtx, rtx mem) |
| { |
| if (REG_P (parm_rtx)) |
| set_reg_attrs_from_value (parm_rtx, mem); |
| else if (GET_CODE (parm_rtx) == PARALLEL) |
| { |
| /* Check for a NULL entry in the first slot, used to indicate that the |
| parameter goes both on the stack and in registers. */ |
| int i = XEXP (XVECEXP (parm_rtx, 0, 0), 0) ? 0 : 1; |
| for (; i < XVECLEN (parm_rtx, 0); i++) |
| { |
| rtx x = XVECEXP (parm_rtx, 0, i); |
| if (REG_P (XEXP (x, 0))) |
| REG_ATTRS (XEXP (x, 0)) |
| = get_reg_attrs (MEM_EXPR (mem), |
| INTVAL (XEXP (x, 1))); |
| } |
| } |
| } |
| |
| /* Set the REG_ATTRS for registers in value X, given that X represents |
| decl T. */ |
| |
| void |
| set_reg_attrs_for_decl_rtl (tree t, rtx x) |
| { |
| if (!t) |
| return; |
| tree tdecl = t; |
| if (GET_CODE (x) == SUBREG) |
| { |
| gcc_assert (subreg_lowpart_p (x)); |
| x = SUBREG_REG (x); |
| } |
| if (REG_P (x)) |
| REG_ATTRS (x) |
| = get_reg_attrs (t, byte_lowpart_offset (GET_MODE (x), |
| DECL_P (tdecl) |
| ? DECL_MODE (tdecl) |
| : TYPE_MODE (TREE_TYPE (tdecl)))); |
| if (GET_CODE (x) == CONCAT) |
| { |
| if (REG_P (XEXP (x, 0))) |
| REG_ATTRS (XEXP (x, 0)) = get_reg_attrs (t, 0); |
| if (REG_P (XEXP (x, 1))) |
| REG_ATTRS (XEXP (x, 1)) |
| = get_reg_attrs (t, GET_MODE_UNIT_SIZE (GET_MODE (XEXP (x, 0)))); |
| } |
| if (GET_CODE (x) == PARALLEL) |
| { |
| int i, start; |
| |
| /* Check for a NULL entry, used to indicate that the parameter goes |
| both on the stack and in registers. */ |
| if (XEXP (XVECEXP (x, 0, 0), 0)) |
| start = 0; |
| else |
| start = 1; |
| |
| for (i = start; i < XVECLEN (x, 0); i++) |
| { |
| rtx y = XVECEXP (x, 0, i); |
| if (REG_P (XEXP (y, 0))) |
| REG_ATTRS (XEXP (y, 0)) = get_reg_attrs (t, INTVAL (XEXP (y, 1))); |
| } |
| } |
| } |
| |
| /* Assign the RTX X to declaration T. */ |
| |
| void |
| set_decl_rtl (tree t, rtx x) |
| { |
| DECL_WRTL_CHECK (t)->decl_with_rtl.rtl = x; |
| if (x) |
| set_reg_attrs_for_decl_rtl (t, x); |
| } |
| |
| /* Assign the RTX X to parameter declaration T. BY_REFERENCE_P is true |
| if the ABI requires the parameter to be passed by reference. */ |
| |
| void |
| set_decl_incoming_rtl (tree t, rtx x, bool by_reference_p) |
| { |
| DECL_INCOMING_RTL (t) = x; |
| if (x && !by_reference_p) |
| set_reg_attrs_for_decl_rtl (t, x); |
| } |
| |
| /* Identify REG (which may be a CONCAT) as a user register. */ |
| |
| void |
| mark_user_reg (rtx reg) |
| { |
| if (GET_CODE (reg) == CONCAT) |
| { |
| REG_USERVAR_P (XEXP (reg, 0)) = 1; |
| REG_USERVAR_P (XEXP (reg, 1)) = 1; |
| } |
| else |
| { |
| gcc_assert (REG_P (reg)); |
| REG_USERVAR_P (reg) = 1; |
| } |
| } |
| |
| /* Identify REG as a probable pointer register and show its alignment |
| as ALIGN, if nonzero. */ |
| |
| void |
| mark_reg_pointer (rtx reg, int align) |
| { |
| if (! REG_POINTER (reg)) |
| { |
| REG_POINTER (reg) = 1; |
| |
| if (align) |
| REGNO_POINTER_ALIGN (REGNO (reg)) = align; |
| } |
| else if (align && align < REGNO_POINTER_ALIGN (REGNO (reg))) |
| /* We can no-longer be sure just how aligned this pointer is. */ |
| REGNO_POINTER_ALIGN (REGNO (reg)) = align; |
| } |
| |
| /* Return 1 plus largest pseudo reg number used in the current function. */ |
| |
| int |
| max_reg_num (void) |
| { |
| return reg_rtx_no; |
| } |
| |
| /* Return 1 + the largest label number used so far in the current function. */ |
| |
| int |
| max_label_num (void) |
| { |
| return label_num; |
| } |
| |
| /* Return first label number used in this function (if any were used). */ |
| |
| int |
| get_first_label_num (void) |
| { |
| return first_label_num; |
| } |
| |
| /* If the rtx for label was created during the expansion of a nested |
| function, then first_label_num won't include this label number. |
| Fix this now so that array indices work later. */ |
| |
| void |
| maybe_set_first_label_num (rtx_code_label *x) |
| { |
| if (CODE_LABEL_NUMBER (x) < first_label_num) |
| first_label_num = CODE_LABEL_NUMBER (x); |
| } |
| |
| /* For use by the RTL function loader, when mingling with normal |
| functions. |
| Ensure that label_num is greater than the label num of X, to avoid |
| duplicate labels in the generated assembler. */ |
| |
| void |
| maybe_set_max_label_num (rtx_code_label *x) |
| { |
| if (CODE_LABEL_NUMBER (x) >= label_num) |
| label_num = CODE_LABEL_NUMBER (x) + 1; |
| } |
| |
| |
| /* Return a value representing some low-order bits of X, where the number |
| of low-order bits is given by MODE. Note that no conversion is done |
| between floating-point and fixed-point values, rather, the bit |
| representation is returned. |
| |
| This function handles the cases in common between gen_lowpart, below, |
| and two variants in cse.c and combine.c. These are the cases that can |
| be safely handled at all points in the compilation. |
| |
| If this is not a case we can handle, return 0. */ |
| |
| rtx |
| gen_lowpart_common (machine_mode mode, rtx x) |
| { |
| int msize = GET_MODE_SIZE (mode); |
| int xsize; |
| machine_mode innermode; |
| |
| /* Unfortunately, this routine doesn't take a parameter for the mode of X, |
| so we have to make one up. Yuk. */ |
| innermode = GET_MODE (x); |
| if (CONST_INT_P (x) |
| && msize * BITS_PER_UNIT <= HOST_BITS_PER_WIDE_INT) |
| innermode = mode_for_size (HOST_BITS_PER_WIDE_INT, MODE_INT, 0); |
| else if (innermode == VOIDmode) |
| innermode = mode_for_size (HOST_BITS_PER_DOUBLE_INT, MODE_INT, 0); |
| |
| xsize = GET_MODE_SIZE (innermode); |
| |
| gcc_assert (innermode != VOIDmode && innermode != BLKmode); |
| |
| if (innermode == mode) |
| return x; |
| |
| /* MODE must occupy no more words than the mode of X. */ |
| if ((msize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD |
| > ((xsize + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)) |
| return 0; |
| |
| /* Don't allow generating paradoxical FLOAT_MODE subregs. */ |
| if (SCALAR_FLOAT_MODE_P (mode) && msize > xsize) |
| return 0; |
| |
| if ((GET_CODE (x) == ZERO_EXTEND || GET_CODE (x) == SIGN_EXTEND) |
| && (GET_MODE_CLASS (mode) == MODE_INT |
| || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)) |
| { |
| /* If we are getting the low-order part of something that has been |
| sign- or zero-extended, we can either just use the object being |
| extended or make a narrower extension. If we want an even smaller |
| piece than the size of the object being extended, call ourselves |
| recursively. |
| |
| This case is used mostly by combine and cse. */ |
| |
| if (GET_MODE (XEXP (x, 0)) == mode) |
| return XEXP (x, 0); |
| else if (msize < GET_MODE_SIZE (GET_MODE (XEXP (x, 0)))) |
| return gen_lowpart_common (mode, XEXP (x, 0)); |
| else if (msize < xsize) |
| return gen_rtx_fmt_e (GET_CODE (x), mode, XEXP (x, 0)); |
| } |
| else if (GET_CODE (x) == SUBREG || REG_P (x) |
| || GET_CODE (x) == CONCAT || GET_CODE (x) == CONST_VECTOR |
| || CONST_DOUBLE_AS_FLOAT_P (x) || CONST_SCALAR_INT_P (x)) |
| return lowpart_subreg (mode, x, innermode); |
| |
| /* Otherwise, we can't do this. */ |
| return 0; |
| } |
| |
| rtx |
| gen_highpart (machine_mode mode, rtx x) |
| { |
| unsigned int msize = GET_MODE_SIZE (mode); |
| rtx result; |
| |
| /* This case loses if X is a subreg. To catch bugs early, |
| complain if an invalid MODE is used even in other cases. */ |
| gcc_assert (msize <= UNITS_PER_WORD |
| || msize == (unsigned int) GET_MODE_UNIT_SIZE (GET_MODE (x))); |
| |
| result = simplify_gen_subreg (mode, x, GET_MODE (x), |
| subreg_highpart_offset (mode, GET_MODE (x))); |
| gcc_assert (result); |
| |
| /* simplify_gen_subreg is not guaranteed to return a valid operand for |
| the target if we have a MEM. gen_highpart must return a valid operand, |
| emitting code if necessary to do so. */ |
| if (MEM_P (result)) |
| { |
| result = validize_mem (result); |
| gcc_assert (result); |
| } |
| |
| return result; |
| } |
| |
| /* Like gen_highpart, but accept mode of EXP operand in case EXP can |
| be VOIDmode constant. */ |
| rtx |
| gen_highpart_mode (machine_mode outermode, machine_mode innermode, rtx exp) |
| { |
| if (GET_MODE (exp) != VOIDmode) |
| { |
| gcc_assert (GET_MODE (exp) == innermode); |
| return gen_highpart (outermode, exp); |
| } |
| return simplify_gen_subreg (outermode, exp, innermode, |
| subreg_highpart_offset (outermode, innermode)); |
| } |
| |
| /* Return the SUBREG_BYTE for a lowpart subreg whose outer mode has |
| OUTER_BYTES bytes and whose inner mode has INNER_BYTES bytes. */ |
| |
| unsigned int |
| subreg_size_lowpart_offset (unsigned int outer_bytes, unsigned int inner_bytes) |
| { |
| if (outer_bytes > inner_bytes) |
| /* Paradoxical subregs always have a SUBREG_BYTE of 0. */ |
| return 0; |
| |
| if (BYTES_BIG_ENDIAN && WORDS_BIG_ENDIAN) |
| return inner_bytes - outer_bytes; |
| else if (!BYTES_BIG_ENDIAN && !WORDS_BIG_ENDIAN) |
| return 0; |
| else |
| return subreg_size_offset_from_lsb (outer_bytes, inner_bytes, 0); |
| } |
| |
| /* Return the SUBREG_BYTE for a highpart subreg whose outer mode has |
| OUTER_BYTES bytes and whose inner mode has INNER_BYTES bytes. */ |
| |
| unsigned int |
| subreg_size_highpart_offset (unsigned int outer_bytes, |
| unsigned int inner_bytes) |
| { |
| gcc_assert (inner_bytes >= outer_bytes); |
| |
| if (BYTES_BIG_ENDIAN && WORDS_BIG_ENDIAN) |
| return 0; |
| else if (!BYTES_BIG_ENDIAN && !WORDS_BIG_ENDIAN) |
| return inner_bytes - outer_bytes; |
| else |
| return subreg_size_offset_from_lsb (outer_bytes, inner_bytes, |
| (inner_bytes - outer_bytes) |
| * BITS_PER_UNIT); |
| } |
| |
| /* Return 1 iff X, assumed to be a SUBREG, |
| refers to the least significant part of its containing reg. |
| If X is not a SUBREG, always return 1 (it is its own low part!). */ |
| |
| int |
| subreg_lowpart_p (const_rtx x) |
| { |
| if (GET_CODE (x) != SUBREG) |
| return 1; |
| else if (GET_MODE (SUBREG_REG (x)) == VOIDmode) |
| return 0; |
| |
| return (subreg_lowpart_offset (GET_MODE (x), GET_MODE (SUBREG_REG (x))) |
| == SUBREG_BYTE (x)); |
| } |
| |
| /* Return true if X is a paradoxical subreg, false otherwise. */ |
| bool |
| paradoxical_subreg_p (const_rtx x) |
| { |
| if (GET_CODE (x) != SUBREG) |
| return false; |
| return (GET_MODE_PRECISION (GET_MODE (x)) |
| > GET_MODE_PRECISION (GET_MODE (SUBREG_REG (x)))); |
| } |
| |
| /* Return subword OFFSET of operand OP. |
| The word number, OFFSET, is interpreted as the word number starting |
| at the low-order address. OFFSET 0 is the low-order word if not |
| WORDS_BIG_ENDIAN, otherwise it is the high-order word. |
| |
| If we cannot extract the required word, we return zero. Otherwise, |
| an rtx corresponding to the requested word will be returned. |
| |
| VALIDATE_ADDRESS is nonzero if the address should be validated. Before |
| reload has completed, a valid address will always be returned. After |
| reload, if a valid address cannot be returned, we return zero. |
| |
| If VALIDATE_ADDRESS is zero, we simply form the required address; validating |
| it is the responsibility of the caller. |
| |
| MODE is the mode of OP in case it is a CONST_INT. |
| |
| ??? This is still rather broken for some cases. The problem for the |
| moment is that all callers of this thing provide no 'goal mode' to |
| tell us to work with. This exists because all callers were written |
| in a word based SUBREG world. |
| Now use of this function can be deprecated by simplify_subreg in most |
| cases. |
| */ |
| |
| rtx |
| operand_subword (rtx op, unsigned int offset, int validate_address, machine_mode mode) |
| { |
| if (mode == VOIDmode) |
| mode = GET_MODE (op); |
| |
| gcc_assert (mode != VOIDmode); |
| |
| /* If OP is narrower than a word, fail. */ |
| if (mode != BLKmode |
| && (GET_MODE_SIZE (mode) < UNITS_PER_WORD)) |
| return 0; |
| |
| /* If we want a word outside OP, return zero. */ |
| if (mode != BLKmode |
| && (offset + 1) * UNITS_PER_WORD > GET_MODE_SIZE (mode)) |
| return const0_rtx; |
| |
| /* Form a new MEM at the requested address. */ |
| if (MEM_P (op)) |
| { |
| rtx new_rtx = adjust_address_nv (op, word_mode, offset * UNITS_PER_WORD); |
| |
| if (! validate_address) |
| return new_rtx; |
| |
| else if (reload_completed) |
| { |
| if (! strict_memory_address_addr_space_p (word_mode, |
| XEXP (new_rtx, 0), |
| MEM_ADDR_SPACE (op))) |
| return 0; |
| } |
| else |
| return replace_equiv_address (new_rtx, XEXP (new_rtx, 0)); |
| } |
| |
| /* Rest can be handled by simplify_subreg. */ |
| return simplify_gen_subreg (word_mode, op, mode, (offset * UNITS_PER_WORD)); |
| } |
| |
| /* Similar to `operand_subword', but never return 0. If we can't |
| extract the required subword, put OP into a register and try again. |
| The second attempt must succeed. We always validate the address in |
| this case. |
| |
| MODE is the mode of OP, in case it is CONST_INT. */ |
| |
| rtx |
| operand_subword_force (rtx op, unsigned int offset, machine_mode mode) |
| { |
| rtx result = operand_subword (op, offset, 1, mode); |
| |
| if (result) |
| return result; |
| |
| if (mode != BLKmode && mode != VOIDmode) |
| { |
| /* If this is a register which can not be accessed by words, copy it |
| to a pseudo register. */ |
| if (REG_P (op)) |
| op = copy_to_reg (op); |
| else |
| op = force_reg (mode, op); |
| } |
| |
| result = operand_subword (op, offset, 1, mode); |
| gcc_assert (result); |
| |
| return result; |
| } |
| |
| /* Returns 1 if both MEM_EXPR can be considered equal |
| and 0 otherwise. */ |
| |
| int |
| mem_expr_equal_p (const_tree expr1, const_tree expr2) |
| { |
| if (expr1 == expr2) |
| return 1; |
| |
| if (! expr1 || ! expr2) |
| return 0; |
| |
| if (TREE_CODE (expr1) != TREE_CODE (expr2)) |
| return 0; |
| |
| return operand_equal_p (expr1, expr2, 0); |
| } |
| |
| /* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN |
| bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or |
| -1 if not known. */ |
| |
| int |
| get_mem_align_offset (rtx mem, unsigned int align) |
| { |
| tree expr; |
| unsigned HOST_WIDE_INT offset; |
| |
| /* This function can't use |
| if (!MEM_EXPR (mem) || !MEM_OFFSET_KNOWN_P (mem) |
| || (MAX (MEM_ALIGN (mem), |
| MAX (align, get_object_alignment (MEM_EXPR (mem)))) |
| < align)) |
| return -1; |
| else |
| return (- MEM_OFFSET (mem)) & (align / BITS_PER_UNIT - 1); |
| for two reasons: |
| - COMPONENT_REFs in MEM_EXPR can have NULL first operand, |
| for <variable>. get_inner_reference doesn't handle it and |
| even if it did, the alignment in that case needs to be determined |
| from DECL_FIELD_CONTEXT's TYPE_ALIGN. |
| - it would do suboptimal job for COMPONENT_REFs, even if MEM_EXPR |
| isn't sufficiently aligned, the object it is in might be. */ |
| gcc_assert (MEM_P (mem)); |
| expr = MEM_EXPR (mem); |
| if (expr == NULL_TREE || !MEM_OFFSET_KNOWN_P (mem)) |
| return -1; |
| |
| offset = MEM_OFFSET (mem); |
| if (DECL_P (expr)) |
| { |
| if (DECL_ALIGN (expr) < align) |
| return -1; |
| } |
| else if (INDIRECT_REF_P (expr)) |
| { |
| if (TYPE_ALIGN (TREE_TYPE (expr)) < (unsigned int) align) |
| return -1; |
| } |
| else if (TREE_CODE (expr) == COMPONENT_REF) |
| { |
| while (1) |
| { |
| tree inner = TREE_OPERAND (expr, 0); |
| tree field = TREE_OPERAND (expr, 1); |
| tree byte_offset = component_ref_field_offset (expr); |
| tree bit_offset = DECL_FIELD_BIT_OFFSET (field); |
| |
| if (!byte_offset |
| || !tree_fits_uhwi_p (byte_offset) |
| || !tree_fits_uhwi_p (bit_offset)) |
| return -1; |
| |
| offset += tree_to_uhwi (byte_offset); |
| offset += tree_to_uhwi (bit_offset) / BITS_PER_UNIT; |
| |
| if (inner == NULL_TREE) |
| { |
| if (TYPE_ALIGN (DECL_FIELD_CONTEXT (field)) |
| < (unsigned int) align) |
| return -1; |
| break; |
| } |
| else if (DECL_P (inner)) |
| { |
| if (DECL_ALIGN (inner) < align) |
| return -1; |
| break; |
| } |
| else if (TREE_CODE (inner) != COMPONENT_REF) |
| return -1; |
| expr = inner; |
| } |
| } |
| else |
| return -1; |
| |
| return offset & ((align / BITS_PER_UNIT) - 1); |
| } |
| |
| /* Given REF (a MEM) and T, either the type of X or the expression |
| corresponding to REF, set the memory attributes. OBJECTP is nonzero |
| if we are making a new object of this type. BITPOS is nonzero if |
| there is an offset outstanding on T that will be applied later. */ |
| |
| void |
| set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp, |
| HOST_WIDE_INT bitpos) |
| { |
| HOST_WIDE_INT apply_bitpos = 0; |
| tree type; |
| struct mem_attrs attrs, *defattrs, *refattrs; |
| addr_space_t as; |
| |
| /* It can happen that type_for_mode was given a mode for which there |
| is no language-level type. In which case it returns NULL, which |
| we can see here. */ |
| if (t == NULL_TREE) |
| return; |
| |
| type = TYPE_P (t) ? t : TREE_TYPE (t); |
| if (type == error_mark_node) |
| return; |
| |
| /* If we have already set DECL_RTL = ref, get_alias_set will get the |
| wrong answer, as it assumes that DECL_RTL already has the right alias |
| info. Callers should not set DECL_RTL until after the call to |
| set_mem_attributes. */ |
| gcc_assert (!DECL_P (t) || ref != DECL_RTL_IF_SET (t)); |
| |
| memset (&attrs, 0, sizeof (attrs)); |
| |
| /* Get the alias set from the expression or type (perhaps using a |
| front-end routine) and use it. */ |
| attrs.alias = get_alias_set (t); |
| |
| MEM_VOLATILE_P (ref) |= TYPE_VOLATILE (type); |
| MEM_POINTER (ref) = POINTER_TYPE_P (type); |
| |
| /* Default values from pre-existing memory attributes if present. */ |
| refattrs = MEM_ATTRS (ref); |
| if (refattrs) |
| { |
| /* ??? Can this ever happen? Calling this routine on a MEM that |
| already carries memory attributes should probably be invalid. */ |
| attrs.expr = refattrs->expr; |
| attrs.offset_known_p = refattrs->offset_known_p; |
| attrs.offset = refattrs->offset; |
| attrs.size_known_p = refattrs->size_known_p; |
| attrs.size = refattrs->size; |
| attrs.align = refattrs->align; |
| } |
| |
| /* Otherwise, default values from the mode of the MEM reference. */ |
| else |
| { |
| defattrs = mode_mem_attrs[(int) GET_MODE (ref)]; |
| gcc_assert (!defattrs->expr); |
| gcc_assert (!defattrs->offset_known_p); |
| |
| /* Respect mode size. */ |
| attrs.size_known_p = defattrs->size_known_p; |
| attrs.size = defattrs->size; |
| /* ??? Is this really necessary? We probably should always get |
| the size from the type below. */ |
| |
| /* Respect mode alignment for STRICT_ALIGNMENT targets if T is a type; |
| if T is an object, always compute the object alignment below. */ |
| if (TYPE_P (t)) |
| attrs.align = defattrs->align; |
| else |
| attrs.align = BITS_PER_UNIT; |
| /* ??? If T is a type, respecting mode alignment may *also* be wrong |
| e.g. if the type carries an alignment attribute. Should we be |
| able to simply always use TYPE_ALIGN? */ |
| } |
| |
| /* We can set the alignment from the type if we are making an object or if |
| this is an INDIRECT_REF. */ |
| if (objectp || TREE_CODE (t) == INDIRECT_REF) |
| attrs.align = MAX (attrs.align, TYPE_ALIGN (type)); |
| |
| /* If the size is known, we can set that. */ |
| tree new_size = TYPE_SIZE_UNIT (type); |
| |
| /* The address-space is that of the type. */ |
| as = TYPE_ADDR_SPACE (type); |
| |
| /* If T is not a type, we may be able to deduce some more information about |
| the expression. */ |
| if (! TYPE_P (t)) |
| { |
| tree base; |
| |
| if (TREE_THIS_VOLATILE (t)) |
| MEM_VOLATILE_P (ref) = 1; |
| |
| /* Now remove any conversions: they don't change what the underlying |
| object is. Likewise for SAVE_EXPR. */ |
| while (CONVERT_EXPR_P (t) |
| || TREE_CODE (t) == VIEW_CONVERT_EXPR |
| || TREE_CODE (t) == SAVE_EXPR) |
| t = TREE_OPERAND (t, 0); |
| |
| /* Note whether this expression can trap. */ |
| MEM_NOTRAP_P (ref) = !tree_could_trap_p (t); |
| |
| base = get_base_address (t); |
| if (base) |
| { |
| if (DECL_P (base) |
| && TREE_READONLY (base) |
| && (TREE_STATIC (base) || DECL_EXTERNAL (base)) |
| && !TREE_THIS_VOLATILE (base)) |
| MEM_READONLY_P (ref) = 1; |
| |
| /* Mark static const strings readonly as well. */ |
| if (TREE_CODE (base) == STRING_CST |
| && TREE_READONLY (base) |
| && TREE_STATIC (base)) |
| MEM_READONLY_P (ref) = 1; |
| |
| /* Address-space information is on the base object. */ |
| if (TREE_CODE (base) == MEM_REF |
| || TREE_CODE (base) == TARGET_MEM_REF) |
| as = TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (TREE_OPERAND (base, |
| 0)))); |
| else |
| as = TYPE_ADDR_SPACE (TREE_TYPE (base)); |
| } |
| |
| /* If this expression uses it's parent's alias set, mark it such |
| that we won't change it. */ |
| if (component_uses_parent_alias_set_from (t) != NULL_TREE) |
| MEM_KEEP_ALIAS_SET_P (ref) = 1; |
| |
| /* If this is a decl, set the attributes of the MEM from it. */ |
| if (DECL_P (t)) |
| { |
| attrs.expr = t; |
| attrs.offset_known_p = true; |
| attrs.offset = 0; |
| apply_bitpos = bitpos; |
| new_size = DECL_SIZE_UNIT (t); |
| } |
| |
| /* ??? If we end up with a constant here do record a MEM_EXPR. */ |
| else if (CONSTANT_CLASS_P (t)) |
| ; |
| |
| /* If this is a field reference, record it. */ |
| else if (TREE_CODE (t) == COMPONENT_REF) |
| { |
| attrs.expr = t; |
| attrs.offset_known_p = true; |
| attrs.offset = 0; |
| apply_bitpos = bitpos; |
| if (DECL_BIT_FIELD (TREE_OPERAND (t, 1))) |
| new_size = DECL_SIZE_UNIT (TREE_OPERAND (t, 1)); |
| } |
| |
| /* If this is an array reference, look for an outer field reference. */ |
| else if (TREE_CODE (t) == ARRAY_REF) |
| { |
| tree off_tree = size_zero_node; |
| /* We can't modify t, because we use it at the end of the |
| function. */ |
| tree t2 = t; |
| |
| do |
| { |
| tree index = TREE_OPERAND (t2, 1); |
| tree low_bound = array_ref_low_bound (t2); |
| tree unit_size = array_ref_element_size (t2); |
| |
| /* We assume all arrays have sizes that are a multiple of a byte. |
| First subtract the lower bound, if any, in the type of the |
| index, then convert to sizetype and multiply by the size of |
| the array element. */ |
| if (! integer_zerop (low_bound)) |
| index = fold_build2 (MINUS_EXPR, TREE_TYPE (index), |
| index, low_bound); |
| |
| off_tree = size_binop (PLUS_EXPR, |
| size_binop (MULT_EXPR, |
| fold_convert (sizetype, |
| index), |
| unit_size), |
| off_tree); |
| t2 = TREE_OPERAND (t2, 0); |
| } |
| while (TREE_CODE (t2) == ARRAY_REF); |
| |
| if (DECL_P (t2) |
| || TREE_CODE (t2) == COMPONENT_REF) |
| { |
| attrs.expr = t2; |
| attrs.offset_known_p = false; |
| if (tree_fits_uhwi_p (off_tree)) |
| { |
| attrs.offset_known_p = true; |
| attrs.offset = tree_to_uhwi (off_tree); |
| apply_bitpos = bitpos; |
| } |
| } |
| /* Else do not record a MEM_EXPR. */ |
| } |
| |
| /* If this is an indirect reference, record it. */ |
| else if (TREE_CODE (t) == MEM_REF |
| || TREE_CODE (t) == TARGET_MEM_REF) |
| { |
| attrs.expr = t; |
| attrs.offset_known_p = true; |
| attrs.offset = 0; |
| apply_bitpos = bitpos; |
| } |
| |
| /* Compute the alignment. */ |
| unsigned int obj_align; |
| unsigned HOST_WIDE_INT obj_bitpos; |
| get_object_alignment_1 (t, &obj_align, &obj_bitpos); |
| obj_bitpos = (obj_bitpos - bitpos) & (obj_align - 1); |
| if (obj_bitpos != 0) |
| obj_align = least_bit_hwi (obj_bitpos); |
| attrs.align = MAX (attrs.align, obj_align); |
| } |
| |
| if (tree_fits_uhwi_p (new_size)) |
| { |
| attrs.size_known_p = true; |
| attrs.size = tree_to_uhwi (new_size); |
| } |
| |
| /* If we modified OFFSET based on T, then subtract the outstanding |
| bit position offset. Similarly, increase the size of the accessed |
| object to contain the negative offset. */ |
| if (apply_bitpos) |
| { |
| gcc_assert (attrs.offset_known_p); |
| attrs.offset -= apply_bitpos / BITS_PER_UNIT; |
| if (attrs.size_known_p) |
| attrs.size += apply_bitpos / BITS_PER_UNIT; |
| } |
| |
| /* Now set the attributes we computed above. */ |
| attrs.addrspace = as; |
| set_mem_attrs (ref, &attrs); |
| } |
| |
| void |
| set_mem_attributes (rtx ref, tree t, int objectp) |
| { |
| set_mem_attributes_minus_bitpos (ref, t, objectp, 0); |
| } |
| |
| /* Set the alias set of MEM to SET. */ |
| |
| void |
| set_mem_alias_set (rtx mem, alias_set_type set) |
| { |
| struct mem_attrs attrs; |
| |
| /* If the new and old alias sets don't conflict, something is wrong. */ |
| gcc_checking_assert (alias_sets_conflict_p (set, MEM_ALIAS_SET (mem))); |
| attrs = *get_mem_attrs (mem); |
| attrs.alias = set; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Set the address space of MEM to ADDRSPACE (target-defined). */ |
| |
| void |
| set_mem_addr_space (rtx mem, addr_space_t addrspace) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.addrspace = addrspace; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Set the alignment of MEM to ALIGN bits. */ |
| |
| void |
| set_mem_align (rtx mem, unsigned int align) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.align = align; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Set the expr for MEM to EXPR. */ |
| |
| void |
| set_mem_expr (rtx mem, tree expr) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.expr = expr; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Set the offset of MEM to OFFSET. */ |
| |
| void |
| set_mem_offset (rtx mem, HOST_WIDE_INT offset) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.offset_known_p = true; |
| attrs.offset = offset; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Clear the offset of MEM. */ |
| |
| void |
| clear_mem_offset (rtx mem) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.offset_known_p = false; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Set the size of MEM to SIZE. */ |
| |
| void |
| set_mem_size (rtx mem, HOST_WIDE_INT size) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.size_known_p = true; |
| attrs.size = size; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Clear the size of MEM. */ |
| |
| void |
| clear_mem_size (rtx mem) |
| { |
| struct mem_attrs attrs; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.size_known_p = false; |
| set_mem_attrs (mem, &attrs); |
| } |
| |
| /* Return a memory reference like MEMREF, but with its mode changed to MODE |
| and its address changed to ADDR. (VOIDmode means don't change the mode. |
| NULL for ADDR means don't change the address.) VALIDATE is nonzero if the |
| returned memory location is required to be valid. INPLACE is true if any |
| changes can be made directly to MEMREF or false if MEMREF must be treated |
| as immutable. |
| |
| The memory attributes are not changed. */ |
| |
| static rtx |
| change_address_1 (rtx memref, machine_mode mode, rtx addr, int validate, |
| bool inplace) |
| { |
| addr_space_t as; |
| rtx new_rtx; |
| |
| gcc_assert (MEM_P (memref)); |
| as = MEM_ADDR_SPACE (memref); |
| if (mode == VOIDmode) |
| mode = GET_MODE (memref); |
| if (addr == 0) |
| addr = XEXP (memref, 0); |
| if (mode == GET_MODE (memref) && addr == XEXP (memref, 0) |
| && (!validate || memory_address_addr_space_p (mode, addr, as))) |
| return memref; |
| |
| /* Don't validate address for LRA. LRA can make the address valid |
| by itself in most efficient way. */ |
| if (validate && !lra_in_progress) |
| { |
| if (reload_in_progress || reload_completed) |
| gcc_assert (memory_address_addr_space_p (mode, addr, as)); |
| else |
| addr = memory_address_addr_space (mode, addr, as); |
| } |
| |
| if (rtx_equal_p (addr, XEXP (memref, 0)) && mode == GET_MODE (memref)) |
| return memref; |
| |
| if (inplace) |
| { |
| XEXP (memref, 0) = addr; |
| return memref; |
| } |
| |
| new_rtx = gen_rtx_MEM (mode, addr); |
| MEM_COPY_ATTRIBUTES (new_rtx, memref); |
| return new_rtx; |
| } |
| |
| /* Like change_address_1 with VALIDATE nonzero, but we are not saying in what |
| way we are changing MEMREF, so we only preserve the alias set. */ |
| |
| rtx |
| change_address (rtx memref, machine_mode mode, rtx addr) |
| { |
| rtx new_rtx = change_address_1 (memref, mode, addr, 1, false); |
| machine_mode mmode = GET_MODE (new_rtx); |
| struct mem_attrs attrs, *defattrs; |
| |
| attrs = *get_mem_attrs (memref); |
| defattrs = mode_mem_attrs[(int) mmode]; |
| attrs.expr = NULL_TREE; |
| attrs.offset_known_p = false; |
| attrs.size_known_p = defattrs->size_known_p; |
| attrs.size = defattrs->size; |
| attrs.align = defattrs->align; |
| |
| /* If there are no changes, just return the original memory reference. */ |
| if (new_rtx == memref) |
| { |
| if (mem_attrs_eq_p (get_mem_attrs (memref), &attrs)) |
| return new_rtx; |
| |
| new_rtx = gen_rtx_MEM (mmode, XEXP (memref, 0)); |
| MEM_COPY_ATTRIBUTES (new_rtx, memref); |
| } |
| |
| set_mem_attrs (new_rtx, &attrs); |
| return new_rtx; |
| } |
| |
| /* Return a memory reference like MEMREF, but with its mode changed |
| to MODE and its address offset by OFFSET bytes. If VALIDATE is |
| nonzero, the memory address is forced to be valid. |
| If ADJUST_ADDRESS is zero, OFFSET is only used to update MEM_ATTRS |
| and the caller is responsible for adjusting MEMREF base register. |
| If ADJUST_OBJECT is zero, the underlying object associated with the |
| memory reference is left unchanged and the caller is responsible for |
| dealing with it. Otherwise, if the new memory reference is outside |
| the underlying object, even partially, then the object is dropped. |
| SIZE, if nonzero, is the size of an access in cases where MODE |
| has no inherent size. */ |
| |
| rtx |
| adjust_address_1 (rtx memref, machine_mode mode, HOST_WIDE_INT offset, |
| int validate, int adjust_address, int adjust_object, |
| HOST_WIDE_INT size) |
| { |
| rtx addr = XEXP (memref, 0); |
| rtx new_rtx; |
| machine_mode address_mode; |
| int pbits; |
| struct mem_attrs attrs = *get_mem_attrs (memref), *defattrs; |
| unsigned HOST_WIDE_INT max_align; |
| #ifdef POINTERS_EXTEND_UNSIGNED |
| machine_mode pointer_mode |
| = targetm.addr_space.pointer_mode (attrs.addrspace); |
| #endif |
| |
| /* VOIDmode means no mode change for change_address_1. */ |
| if (mode == VOIDmode) |
| mode = GET_MODE (memref); |
| |
| /* Take the size of non-BLKmode accesses from the mode. */ |
| defattrs = mode_mem_attrs[(int) mode]; |
| if (defattrs->size_known_p) |
| size = defattrs->size; |
| |
| /* If there are no changes, just return the original memory reference. */ |
| if (mode == GET_MODE (memref) && !offset |
| && (size == 0 || (attrs.size_known_p && attrs.size == size)) |
| && (!validate || memory_address_addr_space_p (mode, addr, |
| attrs.addrspace))) |
| return memref; |
| |
| /* ??? Prefer to create garbage instead of creating shared rtl. |
| This may happen even if offset is nonzero -- consider |
| (plus (plus reg reg) const_int) -- so do this always. */ |
| addr = copy_rtx (addr); |
| |
| /* Convert a possibly large offset to a signed value within the |
| range of the target address space. */ |
| address_mode = get_address_mode (memref); |
| pbits = GET_MODE_BITSIZE (address_mode); |
| if (HOST_BITS_PER_WIDE_INT > pbits) |
| { |
| int shift = HOST_BITS_PER_WIDE_INT - pbits; |
| offset = (((HOST_WIDE_INT) ((unsigned HOST_WIDE_INT) offset << shift)) |
| >> shift); |
| } |
| |
| if (adjust_address) |
| { |
| /* If MEMREF is a LO_SUM and the offset is within the alignment of the |
| object, we can merge it into the LO_SUM. */ |
| if (GET_MODE (memref) != BLKmode && GET_CODE (addr) == LO_SUM |
| && offset >= 0 |
| && (unsigned HOST_WIDE_INT) offset |
| < GET_MODE_ALIGNMENT (GET_MODE (memref)) / BITS_PER_UNIT) |
| addr = gen_rtx_LO_SUM (address_mode, XEXP (addr, 0), |
| plus_constant (address_mode, |
| XEXP (addr, 1), offset)); |
| #ifdef POINTERS_EXTEND_UNSIGNED |
| /* If MEMREF is a ZERO_EXTEND from pointer_mode and the offset is valid |
| in that mode, we merge it into the ZERO_EXTEND. We take advantage of |
| the fact that pointers are not allowed to overflow. */ |
| else if (POINTERS_EXTEND_UNSIGNED > 0 |
| && GET_CODE (addr) == ZERO_EXTEND |
| && GET_MODE (XEXP (addr, 0)) == pointer_mode |
| && trunc_int_for_mode (offset, pointer_mode) == offset) |
| addr = gen_rtx_ZERO_EXTEND (address_mode, |
| plus_constant (pointer_mode, |
| XEXP (addr, 0), offset)); |
| #endif |
| else |
| addr = plus_constant (address_mode, addr, offset); |
| } |
| |
| new_rtx = change_address_1 (memref, mode, addr, validate, false); |
| |
| /* If the address is a REG, change_address_1 rightfully returns memref, |
| but this would destroy memref's MEM_ATTRS. */ |
| if (new_rtx == memref && offset != 0) |
| new_rtx = copy_rtx (new_rtx); |
| |
| /* Conservatively drop the object if we don't know where we start from. */ |
| if (adjust_object && (!attrs.offset_known_p || !attrs.size_known_p)) |
| { |
| attrs.expr = NULL_TREE; |
| attrs.alias = 0; |
| } |
| |
| /* Compute the new values of the memory attributes due to this adjustment. |
| We add the offsets and update the alignment. */ |
| if (attrs.offset_known_p) |
| { |
| attrs.offset += offset; |
| |
| /* Drop the object if the new left end is not within its bounds. */ |
| if (adjust_object && attrs.offset < 0) |
| { |
| attrs.expr = NULL_TREE; |
| attrs.alias = 0; |
| } |
| } |
| |
| /* Compute the new alignment by taking the MIN of the alignment and the |
| lowest-order set bit in OFFSET, but don't change the alignment if OFFSET |
| if zero. */ |
| if (offset != 0) |
| { |
| max_align = least_bit_hwi (offset) * BITS_PER_UNIT; |
| attrs.align = MIN (attrs.align, max_align); |
| } |
| |
| if (size) |
| { |
| /* Drop the object if the new right end is not within its bounds. */ |
| if (adjust_object && (offset + size) > attrs.size) |
| { |
| attrs.expr = NULL_TREE; |
| attrs.alias = 0; |
| } |
| attrs.size_known_p = true; |
| attrs.size = size; |
| } |
| else if (attrs.size_known_p) |
| { |
| gcc_assert (!adjust_object); |
| attrs.size -= offset; |
| /* ??? The store_by_pieces machinery generates negative sizes, |
| so don't assert for that here. */ |
| } |
| |
| set_mem_attrs (new_rtx, &attrs); |
| |
| return new_rtx; |
| } |
| |
| /* Return a memory reference like MEMREF, but with its mode changed |
| to MODE and its address changed to ADDR, which is assumed to be |
| MEMREF offset by OFFSET bytes. If VALIDATE is |
| nonzero, the memory address is forced to be valid. */ |
| |
| rtx |
| adjust_automodify_address_1 (rtx memref, machine_mode mode, rtx addr, |
| HOST_WIDE_INT offset, int validate) |
| { |
| memref = change_address_1 (memref, VOIDmode, addr, validate, false); |
| return adjust_address_1 (memref, mode, offset, validate, 0, 0, 0); |
| } |
| |
| /* Return a memory reference like MEMREF, but whose address is changed by |
| adding OFFSET, an RTX, to it. POW2 is the highest power of two factor |
| known to be in OFFSET (possibly 1). */ |
| |
| rtx |
| offset_address (rtx memref, rtx offset, unsigned HOST_WIDE_INT pow2) |
| { |
| rtx new_rtx, addr = XEXP (memref, 0); |
| machine_mode address_mode; |
| struct mem_attrs attrs, *defattrs; |
| |
| attrs = *get_mem_attrs (memref); |
| address_mode = get_address_mode (memref); |
| new_rtx = simplify_gen_binary (PLUS, address_mode, addr, offset); |
| |
| /* At this point we don't know _why_ the address is invalid. It |
| could have secondary memory references, multiplies or anything. |
| |
| However, if we did go and rearrange things, we can wind up not |
| being able to recognize the magic around pic_offset_table_rtx. |
| This stuff is fragile, and is yet another example of why it is |
| bad to expose PIC machinery too early. */ |
| if (! memory_address_addr_space_p (GET_MODE (memref), new_rtx, |
| attrs.addrspace) |
| && GET_CODE (addr) == PLUS |
| && XEXP (addr, 0) == pic_offset_table_rtx) |
| { |
| addr = force_reg (GET_MODE (addr), addr); |
| new_rtx = simplify_gen_binary (PLUS, address_mode, addr, offset); |
| } |
| |
| update_temp_slot_address (XEXP (memref, 0), new_rtx); |
| new_rtx = change_address_1 (memref, VOIDmode, new_rtx, 1, false); |
| |
| /* If there are no changes, just return the original memory reference. */ |
| if (new_rtx == memref) |
| return new_rtx; |
| |
| /* Update the alignment to reflect the offset. Reset the offset, which |
| we don't know. */ |
| defattrs = mode_mem_attrs[(int) GET_MODE (new_rtx)]; |
| attrs.offset_known_p = false; |
| attrs.size_known_p = defattrs->size_known_p; |
| attrs.size = defattrs->size; |
| attrs.align = MIN (attrs.align, pow2 * BITS_PER_UNIT); |
| set_mem_attrs (new_rtx, &attrs); |
| return new_rtx; |
| } |
| |
| /* Return a memory reference like MEMREF, but with its address changed to |
| ADDR. The caller is asserting that the actual piece of memory pointed |
| to is the same, just the form of the address is being changed, such as |
| by putting something into a register. INPLACE is true if any changes |
| can be made directly to MEMREF or false if MEMREF must be treated as |
| immutable. */ |
| |
| rtx |
| replace_equiv_address (rtx memref, rtx addr, bool inplace) |
| { |
| /* change_address_1 copies the memory attribute structure without change |
| and that's exactly what we want here. */ |
| update_temp_slot_address (XEXP (memref, 0), addr); |
| return change_address_1 (memref, VOIDmode, addr, 1, inplace); |
| } |
| |
| /* Likewise, but the reference is not required to be valid. */ |
| |
| rtx |
| replace_equiv_address_nv (rtx memref, rtx addr, bool inplace) |
| { |
| return change_address_1 (memref, VOIDmode, addr, 0, inplace); |
| } |
| |
| /* Return a memory reference like MEMREF, but with its mode widened to |
| MODE and offset by OFFSET. This would be used by targets that e.g. |
| cannot issue QImode memory operations and have to use SImode memory |
| operations plus masking logic. */ |
| |
| rtx |
| widen_memory_access (rtx memref, machine_mode mode, HOST_WIDE_INT offset) |
| { |
| rtx new_rtx = adjust_address_1 (memref, mode, offset, 1, 1, 0, 0); |
| struct mem_attrs attrs; |
| unsigned int size = GET_MODE_SIZE (mode); |
| |
| /* If there are no changes, just return the original memory reference. */ |
| if (new_rtx == memref) |
| return new_rtx; |
| |
| attrs = *get_mem_attrs (new_rtx); |
| |
| /* If we don't know what offset we were at within the expression, then |
| we can't know if we've overstepped the bounds. */ |
| if (! attrs.offset_known_p) |
| attrs.expr = NULL_TREE; |
| |
| while (attrs.expr) |
| { |
| if (TREE_CODE (attrs.expr) == COMPONENT_REF) |
| { |
| tree field = TREE_OPERAND (attrs.expr, 1); |
| tree offset = component_ref_field_offset (attrs.expr); |
| |
| if (! DECL_SIZE_UNIT (field)) |
| { |
| attrs.expr = NULL_TREE; |
| break; |
| } |
| |
| /* Is the field at least as large as the access? If so, ok, |
| otherwise strip back to the containing structure. */ |
| if (TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST |
| && compare_tree_int (DECL_SIZE_UNIT (field), size) >= 0 |
| && attrs.offset >= 0) |
| break; |
| |
| if (! tree_fits_uhwi_p (offset)) |
| { |
| attrs.expr = NULL_TREE; |
| break; |
| } |
| |
| attrs.expr = TREE_OPERAND (attrs.expr, 0); |
| attrs.offset += tree_to_uhwi (offset); |
| attrs.offset += (tree_to_uhwi (DECL_FIELD_BIT_OFFSET (field)) |
| / BITS_PER_UNIT); |
| } |
| /* Similarly for the decl. */ |
| else if (DECL_P (attrs.expr) |
| && DECL_SIZE_UNIT (attrs.expr) |
| && TREE_CODE (DECL_SIZE_UNIT (attrs.expr)) == INTEGER_CST |
| && compare_tree_int (DECL_SIZE_UNIT (attrs.expr), size) >= 0 |
| && (! attrs.offset_known_p || attrs.offset >= 0)) |
| break; |
| else |
| { |
| /* The widened memory access overflows the expression, which means |
| that it could alias another expression. Zap it. */ |
| attrs.expr = NULL_TREE; |
| break; |
| } |
| } |
| |
| if (! attrs.expr) |
| attrs.offset_known_p = false; |
| |
| /* The widened memory may alias other stuff, so zap the alias set. */ |
| /* ??? Maybe use get_alias_set on any remaining expression. */ |
| attrs.alias = 0; |
| attrs.size_known_p = true; |
| attrs.size = size; |
| set_mem_attrs (new_rtx, &attrs); |
| return new_rtx; |
| } |
| |
| /* A fake decl that is used as the MEM_EXPR of spill slots. */ |
| static GTY(()) tree spill_slot_decl; |
| |
| tree |
| get_spill_slot_decl (bool force_build_p) |
| { |
| tree d = spill_slot_decl; |
| rtx rd; |
| struct mem_attrs attrs; |
| |
| if (d || !force_build_p) |
| return d; |
| |
| d = build_decl (DECL_SOURCE_LOCATION (current_function_decl), |
| VAR_DECL, get_identifier ("%sfp"), void_type_node); |
| DECL_ARTIFICIAL (d) = 1; |
| DECL_IGNORED_P (d) = 1; |
| TREE_USED (d) = 1; |
| spill_slot_decl = d; |
| |
| rd = gen_rtx_MEM (BLKmode, frame_pointer_rtx); |
| MEM_NOTRAP_P (rd) = 1; |
| attrs = *mode_mem_attrs[(int) BLKmode]; |
| attrs.alias = new_alias_set (); |
| attrs.expr = d; |
| set_mem_attrs (rd, &attrs); |
| SET_DECL_RTL (d, rd); |
| |
| return d; |
| } |
| |
| /* Given MEM, a result from assign_stack_local, fill in the memory |
| attributes as appropriate for a register allocator spill slot. |
| These slots are not aliasable by other memory. We arrange for |
| them all to use a single MEM_EXPR, so that the aliasing code can |
| work properly in the case of shared spill slots. */ |
| |
| void |
| set_mem_attrs_for_spill (rtx mem) |
| { |
| struct mem_attrs attrs; |
| rtx addr; |
| |
| attrs = *get_mem_attrs (mem); |
| attrs.expr = get_spill_slot_decl (true); |
| attrs.alias = MEM_ALIAS_SET (DECL_RTL (attrs.expr)); |
| attrs.addrspace = ADDR_SPACE_GENERIC; |
| |
| /* We expect the incoming memory to be of the form: |
| (mem:MODE (plus (reg sfp) (const_int offset))) |
| with perhaps the plus missing for offset = 0. */ |
| addr = XEXP (mem, 0); |
| attrs.offset_known_p = true; |
| attrs.offset = 0; |
| if (GET_CODE (addr) == PLUS |
| && CONST_INT_P (XEXP (addr, 1))) |
| attrs.offset = INTVAL (XEXP (addr, 1)); |
| |
| set_mem_attrs (mem, &attrs); |
| MEM_NOTRAP_P (mem) = 1; |
| } |
| |
| /* Return a newly created CODE_LABEL rtx with a unique label number. */ |
| |
| rtx_code_label * |
| gen_label_rtx (void) |
| { |
| return as_a <rtx_code_label *> ( |
| gen_rtx_CODE_LABEL (VOIDmode, NULL_RTX, NULL_RTX, |
| NULL, label_num++, NULL)); |
| } |
| |
| /* For procedure integration. */ |
| |
| /* Install new pointers to the first and last insns in the chain. |
| Also, set cur_insn_uid to one higher than the last in use. |
| Used for an inline-procedure after copying the insn chain. */ |
| |
| void |
| set_new_first_and_last_insn (rtx_insn *first, rtx_insn *last) |
| { |
| rtx_insn *insn; |
| |
| set_first_insn (first); |
| set_last_insn (last); |
| cur_insn_uid = 0; |
| |
| if (MIN_NONDEBUG_INSN_UID || MAY_HAVE_DEBUG_INSNS) |
| { |
| int debug_count = 0; |
| |
| cur_insn_uid = MIN_NONDEBUG_INSN_UID - 1; |
| cur_debug_insn_uid = 0; |
| |
| for (insn = first; insn; insn = NEXT_INSN (insn)) |
| if (INSN_UID (insn) < MIN_NONDEBUG_INSN_UID) |
| cur_debug_insn_uid = MAX (cur_debug_insn_uid, INSN_UID (insn)); |
| else |
| { |
| cur_insn_uid = MAX (cur_insn_uid, INSN_UID (insn)); |
| if (DEBUG_INSN_P (insn)) |
| debug_count++; |
| } |
| |
| if (debug_count) |
| cur_debug_insn_uid = MIN_NONDEBUG_INSN_UID + debug_count; |
| else |
| cur_debug_insn_uid++; |
| } |
| else |
| for (insn = first; insn; insn = NEXT_INSN (insn)) |
| cur_insn_uid = MAX (cur_insn_uid, INSN_UID (insn)); |
| |
| cur_insn_uid++; |
| } |
| |
| /* Go through all the RTL insn bodies and copy any invalid shared |
| structure. This routine should only be called once. */ |
| |
| static void |
| unshare_all_rtl_1 (rtx_insn *insn) |
| { |
| /* Unshare just about everything else. */ |
| unshare_all_rtl_in_chain (insn); |
| |
| /* Make sure the addresses of stack slots found outside the insn chain |
| (such as, in DECL_RTL of a variable) are not shared |
| with the insn chain. |
| |
| This special care is necessary when the stack slot MEM does not |
| actually appear in the insn chain. If it does appear, its address |
| is unshared from all else at that point. */ |
| unsigned int i; |
| rtx temp; |
| FOR_EACH_VEC_SAFE_ELT (stack_slot_list, i, temp) |
| (*stack_slot_list)[i] = copy_rtx_if_shared (temp); |
| } |
| |
| /* Go through all the RTL insn bodies and copy any invalid shared |
| structure, again. This is a fairly expensive thing to do so it |
| should be done sparingly. */ |
| |
| void |
| unshare_all_rtl_again (rtx_insn *insn) |
| { |
| rtx_insn *p; |
| tree decl; |
| |
| for (p = insn; p; p = NEXT_INSN (p)) |
| if (INSN_P (p)) |
| { |
| reset_used_flags (PATTERN (p)); |
| reset_used_flags (REG_NOTES (p)); |
| if (CALL_P (p)) |
| reset_used_flags (CALL_INSN_FUNCTION_USAGE (p)); |
| } |
| |
| /* Make sure that virtual stack slots are not shared. */ |
| set_used_decls (DECL_INITIAL (cfun->decl)); |
| |
| /* Make sure that virtual parameters are not shared. */ |
| for (decl = DECL_ARGUMENTS (cfun->decl); decl; decl = DECL_CHAIN (decl)) |
| set_used_flags (DECL_RTL (decl)); |
| |
| rtx temp; |
| unsigned int i; |
| FOR_EACH_VEC_SAFE_ELT (stack_slot_list, i, temp) |
| reset_used_flags (temp); |
| |
| unshare_all_rtl_1 (insn); |
| } |
| |
| unsigned int |
| unshare_all_rtl (void) |
| { |
| unshare_all_rtl_1 (get_insns ()); |
| |
| for (tree decl = DECL_ARGUMENTS (cfun->decl); decl; decl = DECL_CHAIN (decl)) |
| { |
| if (DECL_RTL_SET_P (decl)) |
| SET_DECL_RTL (decl, copy_rtx_if_shared (DECL_RTL (decl))); |
| DECL_INCOMING_RTL (decl) = copy_rtx_if_shared (DECL_INCOMING_RTL (decl)); |
| } |
| |
| return 0; |
| } |
| |
| |
| /* Check that ORIG is not marked when it should not be and mark ORIG as in use, |
| Recursively does the same for subexpressions. */ |
| |
| static void |
| verify_rtx_sharing (rtx orig, rtx insn) |
| { |
| rtx x = orig; |
| int i; |
| enum rtx_code code; |
| const char *format_ptr; |
| |
| if (x == 0) |
| return; |
| |
| code = GET_CODE (x); |
| |
| /* These types may be freely shared. */ |
| |
| switch (code) |
| { |
| case REG: |
| case DEBUG_EXPR: |
| case VALUE: |
| CASE_CONST_ANY: |
| case SYMBOL_REF: |
| case LABEL_REF: |
| case CODE_LABEL: |
| case PC: |
| case CC0: |
| case RETURN: |
| case SIMPLE_RETURN: |
| case SCRATCH: |
| /* SCRATCH must be shared because they represent distinct values. */ |
| return; |
| case CLOBBER: |
| /* Share clobbers of hard registers (like cc0), but do not share pseudo reg |
| clobbers or clobbers of hard registers that originated as pseudos. |
| This is needed to allow safe register renaming. */ |
| if (REG_P (XEXP (x, 0)) |
| && HARD_REGISTER_NUM_P (REGNO (XEXP (x, 0))) |
| && HARD_REGISTER_NUM_P (ORIGINAL_REGNO (XEXP (x, 0)))) |
| return; |
| break; |
| |
| case CONST: |
| if (shared_const_p (orig)) |
| return; |
| break; |
| |
| case MEM: |
| /* A MEM is allowed to be shared if its address is constant. */ |
| if (CONSTANT_ADDRESS_P (XEXP (x, 0)) |
| || reload_completed || reload_in_progress) |
| return; |
| |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* This rtx may not be shared. If it has already been seen, |
| replace it with a copy of itself. */ |
| if (flag_checking && RTX_FLAG (x, used)) |
| { |
| error ("invalid rtl sharing found in the insn"); |
| debug_rtx (insn); |
| error ("shared rtx"); |
| debug_rtx (x); |
| internal_error ("internal consistency failure"); |
| } |
| gcc_assert (!RTX_FLAG (x, used)); |
| |
| RTX_FLAG (x, used) = 1; |
| |
| /* Now scan the subexpressions recursively. */ |
| |
| format_ptr = GET_RTX_FORMAT (code); |
| |
| for (i = 0; i < GET_RTX_LENGTH (code); i++) |
| { |
| switch (*format_ptr++) |
| { |
| case 'e': |
| verify_rtx_sharing (XEXP (x, i), insn); |
| break; |
| |
| case 'E': |
| if (XVEC (x, i) != NULL) |
| { |
| int j; |
| int len = XVECLEN (x, i); |
| |
| for (j = 0; j < len; j++) |
| { |
| /* We allow sharing of ASM_OPERANDS inside single |
| instruction. */ |
| if (j && GET_CODE (XVECEXP (x, i, j)) == SET |
| && (GET_CODE (SET_SRC (XVECEXP (x, i, j))) |
| == ASM_OPERANDS)) |
| verify_rtx_sharing (SET_DEST (XVECEXP (x, i, j)), insn); |
| else |
| verify_rtx_sharing (XVECEXP (x, i, j), insn); |
| } |
| } |
| break; |
| } |
| } |
| return; |
| } |
| |
| /* Reset used-flags for INSN. */ |
| |
| static void |
| reset_insn_used_flags (rtx insn) |
| { |
| gcc_assert (INSN_P (insn)); |
| reset_used_flags (PATTERN (insn)); |
| reset_used_flags (REG_NOTES (insn)); |
| if (CALL_P (insn)) |
| reset_used_flags (CALL_INSN_FUNCTION_USAGE (insn)); |
| } |
| |
| /* Go through all the RTL insn bodies and clear all the USED bits. */ |
| |
| static void |
| reset_all_used_flags (void) |
| { |
| rtx_insn *p; |
| |
| for (p = get_insns (); p; p = NEXT_INSN (p)) |
| if (INSN_P (p)) |
| { |
| rtx pat = PATTERN (p); |
| if (GET_CODE (pat) != SEQUENCE) |
| reset_insn_used_flags (p); |
| else |
| { |
| gcc_assert (REG_NOTES (p) == NULL); |
| for (int i = 0; i < XVECLEN (pat, 0); i++) |
| { |
| rtx insn = XVECEXP (pat, 0, i); |
| if (INSN_P (insn)) |
| reset_insn_used_flags (insn); |
| } |
| } |
| } |
| } |
| |
| /* Verify sharing in INSN. */ |
| |
| static void |
| verify_insn_sharing (rtx insn) |
| { |
| gcc_assert (INSN_P (insn)); |
| verify_rtx_sharing (PATTERN (insn), insn); |
| verify_rtx_sharing (REG_NOTES (insn), insn); |
| if (CALL_P (insn)) |
| verify_rtx_sharing (CALL_INSN_FUNCTION_USAGE (insn), insn); |
| } |
| |
| /* Go through all the RTL insn bodies and check that there is no unexpected |
| sharing in between the subexpressions. */ |
| |
| DEBUG_FUNCTION void |
| verify_rtl_sharing (void) |
| { |
| rtx_insn *p; |
| |
| timevar_push (TV_VERIFY_RTL_SHARING); |
| |
| reset_all_used_flags (); |
| |
| for (p = get_insns (); p; p = NEXT_INSN (p)) |
| if (INSN_P (p)) |
| { |
| rtx pat = PATTERN (p); |
| if (GET_CODE (pat) != SEQUENCE) |
| verify_insn_sharing (p); |
| else |
| for (int i = 0; i < XVECLEN (pat, 0); i++) |
| { |
| rtx insn = XVECEXP (pat, 0, i); |
| if (INSN_P (insn)) |
| verify_insn_sharing (insn); |
| } |
| } |
| |
| reset_all_used_flags (); |
| |
| timevar_pop (TV_VERIFY_RTL_SHARING); |
| } |
| |
| /* Go through all the RTL insn bodies and copy any invalid shared structure. |
| Assumes the mark bits are cleared at entry. */ |
| |
| void |
| unshare_all_rtl_in_chain (rtx_insn *insn) |
| { |
| for (; insn; insn = NEXT_INSN (insn)) |
| if (INSN_P (insn)) |
| { |
| PATTERN (insn) = copy_rtx_if_shared (PATTERN (insn)); |
| REG_NOTES (insn) = copy_rtx_if_shared (REG_NOTES (insn)); |
| if (CALL_P (insn)) |
| CALL_INSN_FUNCTION_USAGE (insn) |
| = copy_rtx_if_shared (CALL_INSN_FUNCTION_USAGE (insn)); |
| } |
| } |
| |
| /* Go through all virtual stack slots of a function and mark them as |
| shared. We never replace the DECL_RTLs themselves with a copy, |
| but expressions mentioned into a DECL_RTL cannot be shared with |
| expressions in the instruction stream. |
| |
| Note that reload may convert pseudo registers into memories in-place. |
| Pseudo registers are always shared, but MEMs never are. Thus if we |
| reset the used flags on MEMs in the instruction stream, we must set |
| them again on MEMs that appear in DECL_RTLs. */ |
| |
| static void |
| set_used_decls (tree blk) |
| { |
| tree t; |
| |
| /* Mark decls. */ |
| for (t = BLOCK_VARS (blk); t; t = DECL_CHAIN (t)) |
| if (DECL_RTL_SET_P (t)) |
| set_used_flags (DECL_RTL (t)); |
| |
| /* Now process sub-blocks. */ |
| for (t = BLOCK_SUBBLOCKS (blk); t; t = BLOCK_CHAIN (t)) |
| set_used_decls (t); |
| } |
| |
| /* Mark ORIG as in use, and return a copy of it if it was already in use. |
| Recursively does the same for subexpressions. Uses |
| copy_rtx_if_shared_1 to reduce stack space. */ |
| |
| rtx |
| copy_rtx_if_shared (rtx orig) |
| { |
| copy_rtx_if_shared_1 (&orig); |
| return orig; |
| } |
| |
| /* Mark *ORIG1 as in use, and set it to a copy of it if it was already in |
| use. Recursively does the same for subexpressions. */ |
| |
| static void |
| copy_rtx_if_shared_1 (rtx *orig1) |
| { |
| rtx x; |
| int i; |
| enum rtx_code code; |
| rtx *last_ptr; |
| const char *format_ptr; |
| int copied = 0; |
| int length; |
| |
| /* Repeat is used to turn tail-recursion into iteration. */ |
| repeat: |
| x = *orig1; |
| |
| if (x == 0) |
| return; |
| |
| code = GET_CODE (x); |
| |
| /* These types may be freely shared. */ |
| |
| switch (code) |
| { |
| case REG: |
| case DEBUG_EXPR: |
| case VALUE: |
| CASE_CONST_ANY: |
| case SYMBOL_REF: |
| case LABEL_REF: |
| case CODE_LABEL: |
| case PC: |
| case CC0: |
| case RETURN: |
| case SIMPLE_RETURN: |
| case SCRATCH: |
| /* SCRATCH must be shared because they represent distinct values. */ |
| return; |
| case CLOBBER: |
| /* Share clobbers of hard registers (like cc0), but do not share pseudo reg |
| clobbers or clobbers of hard registers that originated as pseudos. |
| This is needed to allow safe register renaming. */ |
| if (REG_P (XEXP (x, 0)) |
| && HARD_REGISTER_NUM_P (REGNO (XEXP (x, 0))) |
| && HARD_REGISTER_NUM_P (ORIGINAL_REGNO (XEXP (x, 0)))) |
| return; |
| break; |
| |
| case CONST: |
| if (shared_const_p (x)) |
| return; |
| break; |
| |
| case DEBUG_INSN: |
| case INSN: |
| case JUMP_INSN: |
| case CALL_INSN: |
| case NOTE: |
| case BARRIER: |
| /* The chain of insns is not being copied. */ |
| return; |
| |
| default: |
| break; |
| } |
| |
| /* This rtx may not be shared. If it has already been seen, |
| replace it with a copy of itself. */ |
| |
| if (RTX_FLAG (x, used)) |
| { |
| x = shallow_copy_rtx (x); |
| copied = 1; |
| } |
| RTX_FLAG (x, used) = 1; |
| |
| /* Now scan the subexpressions recursively. |
| We can store any replaced subexpressions directly into X |
| since we know X is not shared! Any vectors in X |
| must be copied if X was copied. */ |
| |
| format_ptr = GET_RTX_FORMAT (code); |
| length = GET_RTX_LENGTH (code); |
| last_ptr = NULL; |
| |
| for (i = 0; i < length; i++) |
| { |
| switch (*format_ptr++) |
| { |
| case 'e': |
| if (last_ptr) |
| copy_rtx_if_shared_1 (last_ptr); |
| last_ptr = &XEXP (x, i); |
| break; |
| |
| case 'E': |
| if (XVEC (x, i) != NULL) |
| { |
| int j; |
| int len = XVECLEN (x, i); |
| |
| /* Copy the vector iff I copied the rtx and the length |
| is nonzero. */ |
| if (copied && len > 0) |
| XVEC (x, i) = gen_rtvec_v (len, XVEC (x, i)->elem); |
| |
| /* Call recursively on all inside the vector. */ |
| for (j = 0; j < len; j++) |
| { |
| if (last_ptr) |
| copy_rtx_if_shared_1 (last_ptr); |
| last_ptr = &XVECEXP (x, i, j); |
| } |
| } |
| break; |
| } |
| } |
| *orig1 = x; |
| if (last_ptr) |
| { |
| orig1 = last_ptr; |
| goto repeat; |
| } |
| return; |
| } |
| |
| /* Set the USED bit in X and its non-shareable subparts to FLAG. */ |
| |
| static void |
| mark_used_flags (rtx x, int flag) |
| { |
| int i, j; |
| enum rtx_code code; |
| const char *format_ptr; |
| int length; |
| |
| /* Repeat is used to turn tail-recursion into iteration. */ |
| repeat: |
| if (x == 0) |
| return; |
| |
| code = GET_CODE (x); |
| |
| /* These types may be freely shared so we needn't do any resetting |
| for them. */ |
| |
| switch (code) |
| { |
| case REG: |
| case DEBUG_EXPR: |
| case VALUE: |
| CASE_CONST_ANY: |
| case SYMBOL_REF: |
| case CODE_LABEL: |
| case PC: |
| case CC0: |
| case RETURN: |
| case SIMPLE_RETURN: |
| return; |
| |
| case DEBUG_INSN: |
| case INSN: |
| case JUMP_INSN: |
| case CALL_INSN: |
| case NOTE: |
| case LABEL_REF: |
| case BARRIER: |
| /* The chain of insns is not being copied. */ |
| return; |
| |
| default: |
| break; |
| } |
| |
| RTX_FLAG (x, used) = flag; |
| |
| format_ptr = GET_RTX_FORMAT (code); |
| length = GET_RTX_LENGTH (code); |
| |
| for (i = 0; i < length; i++) |
| { |
| switch (*format_ptr++) |
| { |
| case 'e': |
| if (i == length-1) |
| { |
| x = XEXP (x, i); |
| goto repeat; |
| } |
| mark_used_flags (XEXP (x, i), flag); |
| break; |
| |
| case 'E': |
| for (j = 0; j < XVECLEN (x, i); j++) |
| mark_used_flags (XVECEXP (x, i, j), flag); |
| break; |
| } |
| } |
| } |
| |
| /* Clear all the USED bits in X to allow copy_rtx_if_shared to be used |
| to look for shared sub-parts. */ |
| |
| void |
| reset_used_flags (rtx x) |
| { |
| mark_used_flags (x, 0); |
| } |
| |
| /* Set all the USED bits in X to allow copy_rtx_if_shared to be used |
| to look for shared sub-parts. */ |
| |
| void |
| set_used_flags (rtx x) |
| { |
| mark_used_flags (x, 1); |
| } |
| |
| /* Copy X if necessary so that it won't be altered by changes in OTHER. |
| Return X or the rtx for the pseudo reg the value of X was copied into. |
| OTHER must be valid as a SET_DEST. */ |
| |
| rtx |
| make_safe_from (rtx x, rtx other) |
| { |
| while (1) |
| switch (GET_CODE (other)) |
| { |
| case SUBREG: |
| other = SUBREG_REG (other); |
| break; |
| case STRICT_LOW_PART: |
| case SIGN_EXTEND: |
| case ZERO_EXTEND: |
| other = XEXP (other, 0); |
| break; |
| default: |
| goto done; |
| } |
| done: |
| if ((MEM_P (other) |
| && ! CONSTANT_P (x) |
| && !REG_P (x) |
| && GET_CODE (x) != SUBREG) |
| || (REG_P (other) |
| && (REGNO (other) < FIRST_PSEUDO_REGISTER |
| || reg_mentioned_p (other, x)))) |
| { |
| rtx temp = gen_reg_rtx (GET_MODE (x)); |
| emit_move_insn (temp, x); |
| return temp; |
| } |
| return x; |
| } |
| |
| /* Emission of insns (adding them to the doubly-linked list). */ |
| |
| /* Return the last insn emitted, even if it is in a sequence now pushed. */ |
| |
| rtx_insn * |
| get_last_insn_anywhere (void) |
| { |
| struct sequence_stack *seq; |
| for (seq = get_current_sequence (); seq; seq = seq->next) |
| if (seq->last != 0) |
| return seq->last; |
| return 0; |
| } |
| |
| /* Return the first nonnote insn emitted in current sequence or current |
| function. This routine looks inside SEQUENCEs. */ |
| |
| rtx_insn * |
| get_first_nonnote_insn (void) |
| { |
| rtx_insn *insn = get_insns (); |
| |
| if (insn) |
| { |
| if (NOTE_P (insn)) |
| for (insn = next_insn (insn); |
| insn && NOTE_P (insn); |
| insn = next_insn (insn)) |
| continue; |
| else |
| { |
| if (NONJUMP_INSN_P (insn) |
| && GET_CODE (PATTERN (insn)) == SEQUENCE) |
| insn = as_a <rtx_sequence *> (PATTERN (insn))->insn (0); |
| } |
| } |
| |
| return insn; |
| } |
| |
| /* Return the last nonnote insn emitted in current sequence or current |
| function. This routine looks inside SEQUENCEs. */ |
| |
| rtx_insn * |
| get_last_nonnote_insn (void) |
| { |
| rtx_insn *insn = get_last_insn (); |
| |
| if (insn) |
| { |
| if (NOTE_P (insn)) |
| for (insn = previous_insn (insn); |
| insn && NOTE_P (insn); |
| insn = previous_insn (insn)) |
| continue; |
| else |
| { |
| if (NONJUMP_INSN_P (insn)) |
| if (rtx_sequence *seq = dyn_cast <rtx_sequence *> (PATTERN (insn))) |
| insn = seq->insn (seq->len () - 1); |
| } |
| } |
| |
| return insn; |
| } |
| |
| /* Return the number of actual (non-debug) insns emitted in this |
| function. */ |
| |
| int |
| get_max_insn_count (void) |
| { |
| int n = cur_insn_uid; |
| |
| /* The table size must be stable across -g, to avoid codegen |
| differences due to debug insns, and not be affected by |
| -fmin-insn-uid, to avoid excessive table size and to simplify |
| debugging of -fcompare-debug failures. */ |
| if (cur_debug_insn_uid > MIN_NONDEBUG_INSN_UID) |
| n -= cur_debug_insn_uid; |
| else |
| n -= MIN_NONDEBUG_INSN_UID; |
| |
| return n; |
| } |
| |
| |
| /* Return the next insn. If it is a SEQUENCE, return the first insn |
| of the sequence. */ |
| |
| rtx_insn * |
| next_insn (rtx_insn *insn) |
| { |
| if (insn) |
| { |
| insn = NEXT_INSN (insn); |
| if (insn && NONJUMP_INSN_P (insn) |
| && GET_CODE (PATTERN (insn)) == SEQUENCE) |
| insn = as_a <rtx_sequence *> (PATTERN (insn))->insn (0); |
| } |
| |
| return insn; |
| } |
|