diff options
Diffstat (limited to 'gcc-4.8.1/gcc/regcprop.c')
| -rw-r--r-- | gcc-4.8.1/gcc/regcprop.c | 1258 |
1 files changed, 0 insertions, 1258 deletions
diff --git a/gcc-4.8.1/gcc/regcprop.c b/gcc-4.8.1/gcc/regcprop.c deleted file mode 100644 index 896902f30..000000000 --- a/gcc-4.8.1/gcc/regcprop.c +++ /dev/null @@ -1,1258 +0,0 @@ -/* Copy propagation on hard registers for the GNU compiler. - Copyright (C) 2000-2013 Free Software Foundation, Inc. - - This file is part of GCC. - - GCC is free software; you can redistribute it and/or modify it - under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3, or (at your option) - any later version. - - GCC is distributed in the hope that it will be useful, but WITHOUT - ANY WARRANTY; without even the implied warranty of MERCHANTABILITY - or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public - License for more details. - - You should have received a copy of the GNU General Public License - along with GCC; see the file COPYING3. If not see - <http://www.gnu.org/licenses/>. */ - -#include "config.h" -#include "system.h" -#include "coretypes.h" -#include "tm.h" -#include "rtl.h" -#include "tm_p.h" -#include "insn-config.h" -#include "regs.h" -#include "addresses.h" -#include "hard-reg-set.h" -#include "basic-block.h" -#include "reload.h" -#include "function.h" -#include "recog.h" -#include "flags.h" -#include "diagnostic-core.h" -#include "obstack.h" -#include "tree-pass.h" -#include "df.h" - -/* The following code does forward propagation of hard register copies. - The object is to eliminate as many dependencies as possible, so that - we have the most scheduling freedom. As a side effect, we also clean - up some silly register allocation decisions made by reload. This - code may be obsoleted by a new register allocator. */ - -/* DEBUG_INSNs aren't changed right away, as doing so might extend the - lifetime of a register and get the DEBUG_INSN subsequently reset. - So they are queued instead, and updated only when the register is - used in some subsequent real insn before it is set. */ -struct queued_debug_insn_change -{ - struct queued_debug_insn_change *next; - rtx insn; - rtx *loc; - rtx new_rtx; -}; - -/* For each register, we have a list of registers that contain the same - value. The OLDEST_REGNO field points to the head of the list, and - the NEXT_REGNO field runs through the list. The MODE field indicates - what mode the data is known to be in; this field is VOIDmode when the - register is not known to contain valid data. */ - -struct value_data_entry -{ - enum machine_mode mode; - unsigned int oldest_regno; - unsigned int next_regno; - struct queued_debug_insn_change *debug_insn_changes; -}; - -struct value_data -{ - struct value_data_entry e[FIRST_PSEUDO_REGISTER]; - unsigned int max_value_regs; - unsigned int n_debug_insn_changes; -}; - -static alloc_pool debug_insn_changes_pool; - -static void kill_value_one_regno (unsigned, struct value_data *); -static void kill_value_regno (unsigned, unsigned, struct value_data *); -static void kill_value (rtx, struct value_data *); -static void set_value_regno (unsigned, enum machine_mode, struct value_data *); -static void init_value_data (struct value_data *); -static void kill_clobbered_value (rtx, const_rtx, void *); -static void kill_set_value (rtx, const_rtx, void *); -static int kill_autoinc_value (rtx *, void *); -static void copy_value (rtx, rtx, struct value_data *); -static bool mode_change_ok (enum machine_mode, enum machine_mode, - unsigned int); -static rtx maybe_mode_change (enum machine_mode, enum machine_mode, - enum machine_mode, unsigned int, unsigned int); -static rtx find_oldest_value_reg (enum reg_class, rtx, struct value_data *); -static bool replace_oldest_value_reg (rtx *, enum reg_class, rtx, - struct value_data *); -static bool replace_oldest_value_addr (rtx *, enum reg_class, - enum machine_mode, addr_space_t, rtx, - struct value_data *); -static bool replace_oldest_value_mem (rtx, rtx, struct value_data *); -static bool copyprop_hardreg_forward_1 (basic_block, struct value_data *); -extern void debug_value_data (struct value_data *); -#ifdef ENABLE_CHECKING -static void validate_value_data (struct value_data *); -#endif - -/* Free all queued updates for DEBUG_INSNs that change some reg to - register REGNO. */ - -static void -free_debug_insn_changes (struct value_data *vd, unsigned int regno) -{ - struct queued_debug_insn_change *cur, *next; - for (cur = vd->e[regno].debug_insn_changes; cur; cur = next) - { - next = cur->next; - --vd->n_debug_insn_changes; - pool_free (debug_insn_changes_pool, cur); - } - vd->e[regno].debug_insn_changes = NULL; -} - -/* Kill register REGNO. This involves removing it from any value - lists, and resetting the value mode to VOIDmode. This is only a - helper function; it does not handle any hard registers overlapping - with REGNO. */ - -static void -kill_value_one_regno (unsigned int regno, struct value_data *vd) -{ - unsigned int i, next; - - if (vd->e[regno].oldest_regno != regno) - { - for (i = vd->e[regno].oldest_regno; - vd->e[i].next_regno != regno; - i = vd->e[i].next_regno) - continue; - vd->e[i].next_regno = vd->e[regno].next_regno; - } - else if ((next = vd->e[regno].next_regno) != INVALID_REGNUM) - { - for (i = next; i != INVALID_REGNUM; i = vd->e[i].next_regno) - vd->e[i].oldest_regno = next; - } - - vd->e[regno].mode = VOIDmode; - vd->e[regno].oldest_regno = regno; - vd->e[regno].next_regno = INVALID_REGNUM; - if (vd->e[regno].debug_insn_changes) - free_debug_insn_changes (vd, regno); - -#ifdef ENABLE_CHECKING - validate_value_data (vd); -#endif -} - -/* Kill the value in register REGNO for NREGS, and any other registers - whose values overlap. */ - -static void -kill_value_regno (unsigned int regno, unsigned int nregs, - struct value_data *vd) -{ - unsigned int j; - - /* Kill the value we're told to kill. */ - for (j = 0; j < nregs; ++j) - kill_value_one_regno (regno + j, vd); - - /* Kill everything that overlapped what we're told to kill. */ - if (regno < vd->max_value_regs) - j = 0; - else - j = regno - vd->max_value_regs; - for (; j < regno; ++j) - { - unsigned int i, n; - if (vd->e[j].mode == VOIDmode) - continue; - n = hard_regno_nregs[j][vd->e[j].mode]; - if (j + n > regno) - for (i = 0; i < n; ++i) - kill_value_one_regno (j + i, vd); - } -} - -/* Kill X. This is a convenience function wrapping kill_value_regno - so that we mind the mode the register is in. */ - -static void -kill_value (rtx x, struct value_data *vd) -{ - rtx orig_rtx = x; - - if (GET_CODE (x) == SUBREG) - { - x = simplify_subreg (GET_MODE (x), SUBREG_REG (x), - GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x)); - if (x == NULL_RTX) - x = SUBREG_REG (orig_rtx); - } - if (REG_P (x)) - { - unsigned int regno = REGNO (x); - unsigned int n = hard_regno_nregs[regno][GET_MODE (x)]; - - kill_value_regno (regno, n, vd); - } -} - -/* Remember that REGNO is valid in MODE. */ - -static void -set_value_regno (unsigned int regno, enum machine_mode mode, - struct value_data *vd) -{ - unsigned int nregs; - - vd->e[regno].mode = mode; - - nregs = hard_regno_nregs[regno][mode]; - if (nregs > vd->max_value_regs) - vd->max_value_regs = nregs; -} - -/* Initialize VD such that there are no known relationships between regs. */ - -static void -init_value_data (struct value_data *vd) -{ - int i; - for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) - { - vd->e[i].mode = VOIDmode; - vd->e[i].oldest_regno = i; - vd->e[i].next_regno = INVALID_REGNUM; - vd->e[i].debug_insn_changes = NULL; - } - vd->max_value_regs = 0; - vd->n_debug_insn_changes = 0; -} - -/* Called through note_stores. If X is clobbered, kill its value. */ - -static void -kill_clobbered_value (rtx x, const_rtx set, void *data) -{ - struct value_data *const vd = (struct value_data *) data; - if (GET_CODE (set) == CLOBBER) - kill_value (x, vd); -} - -/* A structure passed as data to kill_set_value through note_stores. */ -struct kill_set_value_data -{ - struct value_data *vd; - rtx ignore_set_reg; -}; - -/* Called through note_stores. If X is set, not clobbered, kill its - current value and install it as the root of its own value list. */ - -static void -kill_set_value (rtx x, const_rtx set, void *data) -{ - struct kill_set_value_data *ksvd = (struct kill_set_value_data *) data; - if (rtx_equal_p (x, ksvd->ignore_set_reg)) - return; - if (GET_CODE (set) != CLOBBER) - { - kill_value (x, ksvd->vd); - if (REG_P (x)) - set_value_regno (REGNO (x), GET_MODE (x), ksvd->vd); - } -} - -/* Called through for_each_rtx. Kill any register used as the base of an - auto-increment expression, and install that register as the root of its - own value list. */ - -static int -kill_autoinc_value (rtx *px, void *data) -{ - rtx x = *px; - struct value_data *const vd = (struct value_data *) data; - - if (GET_RTX_CLASS (GET_CODE (x)) == RTX_AUTOINC) - { - x = XEXP (x, 0); - kill_value (x, vd); - set_value_regno (REGNO (x), GET_MODE (x), vd); - return -1; - } - - return 0; -} - -/* Assert that SRC has been copied to DEST. Adjust the data structures - to reflect that SRC contains an older copy of the shared value. */ - -static void -copy_value (rtx dest, rtx src, struct value_data *vd) -{ - unsigned int dr = REGNO (dest); - unsigned int sr = REGNO (src); - unsigned int dn, sn; - unsigned int i; - - /* ??? At present, it's possible to see noop sets. It'd be nice if - this were cleaned up beforehand... */ - if (sr == dr) - return; - - /* Do not propagate copies to the stack pointer, as that can leave - memory accesses with no scheduling dependency on the stack update. */ - if (dr == STACK_POINTER_REGNUM) - return; - - /* Likewise with the frame pointer, if we're using one. */ - if (frame_pointer_needed && dr == HARD_FRAME_POINTER_REGNUM) - return; - - /* Do not propagate copies to fixed or global registers, patterns - can be relying to see particular fixed register or users can - expect the chosen global register in asm. */ - if (fixed_regs[dr] || global_regs[dr]) - return; - - /* If SRC and DEST overlap, don't record anything. */ - dn = hard_regno_nregs[dr][GET_MODE (dest)]; - sn = hard_regno_nregs[sr][GET_MODE (dest)]; - if ((dr > sr && dr < sr + sn) - || (sr > dr && sr < dr + dn)) - return; - - /* If SRC had no assigned mode (i.e. we didn't know it was live) - assign it now and assume the value came from an input argument - or somesuch. */ - if (vd->e[sr].mode == VOIDmode) - set_value_regno (sr, vd->e[dr].mode, vd); - - /* If we are narrowing the input to a smaller number of hard regs, - and it is in big endian, we are really extracting a high part. - Since we generally associate a low part of a value with the value itself, - we must not do the same for the high part. - Note we can still get low parts for the same mode combination through - a two-step copy involving differently sized hard regs. - Assume hard regs fr* are 32 bits bits each, while r* are 64 bits each: - (set (reg:DI r0) (reg:DI fr0)) - (set (reg:SI fr2) (reg:SI r0)) - loads the low part of (reg:DI fr0) - i.e. fr1 - into fr2, while: - (set (reg:SI fr2) (reg:SI fr0)) - loads the high part of (reg:DI fr0) into fr2. - - We can't properly represent the latter case in our tables, so don't - record anything then. */ - else if (sn < (unsigned int) hard_regno_nregs[sr][vd->e[sr].mode] - && (GET_MODE_SIZE (vd->e[sr].mode) > UNITS_PER_WORD - ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) - return; - - /* If SRC had been assigned a mode narrower than the copy, we can't - link DEST into the chain, because not all of the pieces of the - copy came from oldest_regno. */ - else if (sn > (unsigned int) hard_regno_nregs[sr][vd->e[sr].mode]) - return; - - /* Link DR at the end of the value chain used by SR. */ - - vd->e[dr].oldest_regno = vd->e[sr].oldest_regno; - - for (i = sr; vd->e[i].next_regno != INVALID_REGNUM; i = vd->e[i].next_regno) - continue; - vd->e[i].next_regno = dr; - -#ifdef ENABLE_CHECKING - validate_value_data (vd); -#endif -} - -/* Return true if a mode change from ORIG to NEW is allowed for REGNO. */ - -static bool -mode_change_ok (enum machine_mode orig_mode, enum machine_mode new_mode, - unsigned int regno ATTRIBUTE_UNUSED) -{ - if (GET_MODE_SIZE (orig_mode) < GET_MODE_SIZE (new_mode)) - return false; - -#ifdef CANNOT_CHANGE_MODE_CLASS - return !REG_CANNOT_CHANGE_MODE_P (regno, orig_mode, new_mode); -#endif - - return true; -} - -/* Register REGNO was originally set in ORIG_MODE. It - or a copy of it - - was copied in COPY_MODE to COPY_REGNO, and then COPY_REGNO was accessed - in NEW_MODE. - Return a NEW_MODE rtx for REGNO if that's OK, otherwise return NULL_RTX. */ - -static rtx -maybe_mode_change (enum machine_mode orig_mode, enum machine_mode copy_mode, - enum machine_mode new_mode, unsigned int regno, - unsigned int copy_regno ATTRIBUTE_UNUSED) -{ - if (GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (orig_mode) - && GET_MODE_SIZE (copy_mode) < GET_MODE_SIZE (new_mode)) - return NULL_RTX; - - if (orig_mode == new_mode) - return gen_rtx_raw_REG (new_mode, regno); - else if (mode_change_ok (orig_mode, new_mode, regno)) - { - int copy_nregs = hard_regno_nregs[copy_regno][copy_mode]; - int use_nregs = hard_regno_nregs[copy_regno][new_mode]; - int copy_offset - = GET_MODE_SIZE (copy_mode) / copy_nregs * (copy_nregs - use_nregs); - int offset - = GET_MODE_SIZE (orig_mode) - GET_MODE_SIZE (new_mode) - copy_offset; - int byteoffset = offset % UNITS_PER_WORD; - int wordoffset = offset - byteoffset; - - offset = ((WORDS_BIG_ENDIAN ? wordoffset : 0) - + (BYTES_BIG_ENDIAN ? byteoffset : 0)); - regno += subreg_regno_offset (regno, orig_mode, offset, new_mode); - if (HARD_REGNO_MODE_OK (regno, new_mode)) - return gen_rtx_raw_REG (new_mode, regno); - } - return NULL_RTX; -} - -/* Find the oldest copy of the value contained in REGNO that is in - register class CL and has mode MODE. If found, return an rtx - of that oldest register, otherwise return NULL. */ - -static rtx -find_oldest_value_reg (enum reg_class cl, rtx reg, struct value_data *vd) -{ - unsigned int regno = REGNO (reg); - enum machine_mode mode = GET_MODE (reg); - unsigned int i; - - /* If we are accessing REG in some mode other that what we set it in, - make sure that the replacement is valid. In particular, consider - (set (reg:DI r11) (...)) - (set (reg:SI r9) (reg:SI r11)) - (set (reg:SI r10) (...)) - (set (...) (reg:DI r9)) - Replacing r9 with r11 is invalid. */ - if (mode != vd->e[regno].mode) - { - if (hard_regno_nregs[regno][mode] - > hard_regno_nregs[regno][vd->e[regno].mode]) - return NULL_RTX; - } - - for (i = vd->e[regno].oldest_regno; i != regno; i = vd->e[i].next_regno) - { - enum machine_mode oldmode = vd->e[i].mode; - rtx new_rtx; - - if (!in_hard_reg_set_p (reg_class_contents[cl], mode, i)) - continue; - - new_rtx = maybe_mode_change (oldmode, vd->e[regno].mode, mode, i, regno); - if (new_rtx) - { - ORIGINAL_REGNO (new_rtx) = ORIGINAL_REGNO (reg); - REG_ATTRS (new_rtx) = REG_ATTRS (reg); - REG_POINTER (new_rtx) = REG_POINTER (reg); - return new_rtx; - } - } - - return NULL_RTX; -} - -/* If possible, replace the register at *LOC with the oldest register - in register class CL. Return true if successfully replaced. */ - -static bool -replace_oldest_value_reg (rtx *loc, enum reg_class cl, rtx insn, - struct value_data *vd) -{ - rtx new_rtx = find_oldest_value_reg (cl, *loc, vd); - if (new_rtx) - { - if (DEBUG_INSN_P (insn)) - { - struct queued_debug_insn_change *change; - - if (dump_file) - fprintf (dump_file, "debug_insn %u: queued replacing reg %u with %u\n", - INSN_UID (insn), REGNO (*loc), REGNO (new_rtx)); - - change = (struct queued_debug_insn_change *) - pool_alloc (debug_insn_changes_pool); - change->next = vd->e[REGNO (new_rtx)].debug_insn_changes; - change->insn = insn; - change->loc = loc; - change->new_rtx = new_rtx; - vd->e[REGNO (new_rtx)].debug_insn_changes = change; - ++vd->n_debug_insn_changes; - return true; - } - if (dump_file) - fprintf (dump_file, "insn %u: replaced reg %u with %u\n", - INSN_UID (insn), REGNO (*loc), REGNO (new_rtx)); - - validate_change (insn, loc, new_rtx, 1); - return true; - } - return false; -} - -/* Similar to replace_oldest_value_reg, but *LOC contains an address. - Adapted from find_reloads_address_1. CL is INDEX_REG_CLASS or - BASE_REG_CLASS depending on how the register is being considered. */ - -static bool -replace_oldest_value_addr (rtx *loc, enum reg_class cl, - enum machine_mode mode, addr_space_t as, - rtx insn, struct value_data *vd) -{ - rtx x = *loc; - RTX_CODE code = GET_CODE (x); - const char *fmt; - int i, j; - bool changed = false; - - switch (code) - { - case PLUS: - if (DEBUG_INSN_P (insn)) - break; - - { - rtx orig_op0 = XEXP (x, 0); - rtx orig_op1 = XEXP (x, 1); - RTX_CODE code0 = GET_CODE (orig_op0); - RTX_CODE code1 = GET_CODE (orig_op1); - rtx op0 = orig_op0; - rtx op1 = orig_op1; - rtx *locI = NULL; - rtx *locB = NULL; - enum rtx_code index_code = SCRATCH; - - if (GET_CODE (op0) == SUBREG) - { - op0 = SUBREG_REG (op0); - code0 = GET_CODE (op0); - } - - if (GET_CODE (op1) == SUBREG) - { - op1 = SUBREG_REG (op1); - code1 = GET_CODE (op1); - } - - if (code0 == MULT || code0 == SIGN_EXTEND || code0 == TRUNCATE - || code0 == ZERO_EXTEND || code1 == MEM) - { - locI = &XEXP (x, 0); - locB = &XEXP (x, 1); - index_code = GET_CODE (*locI); - } - else if (code1 == MULT || code1 == SIGN_EXTEND || code1 == TRUNCATE - || code1 == ZERO_EXTEND || code0 == MEM) - { - locI = &XEXP (x, 1); - locB = &XEXP (x, 0); - index_code = GET_CODE (*locI); - } - else if (code0 == CONST_INT || code0 == CONST - || code0 == SYMBOL_REF || code0 == LABEL_REF) - { - locB = &XEXP (x, 1); - index_code = GET_CODE (XEXP (x, 0)); - } - else if (code1 == CONST_INT || code1 == CONST - || code1 == SYMBOL_REF || code1 == LABEL_REF) - { - locB = &XEXP (x, 0); - index_code = GET_CODE (XEXP (x, 1)); - } - else if (code0 == REG && code1 == REG) - { - int index_op; - unsigned regno0 = REGNO (op0), regno1 = REGNO (op1); - - if (REGNO_OK_FOR_INDEX_P (regno1) - && regno_ok_for_base_p (regno0, mode, as, PLUS, REG)) - index_op = 1; - else if (REGNO_OK_FOR_INDEX_P (regno0) - && regno_ok_for_base_p (regno1, mode, as, PLUS, REG)) - index_op = 0; - else if (regno_ok_for_base_p (regno0, mode, as, PLUS, REG) - || REGNO_OK_FOR_INDEX_P (regno1)) - index_op = 1; - else if (regno_ok_for_base_p (regno1, mode, as, PLUS, REG)) - index_op = 0; - else - index_op = 1; - - locI = &XEXP (x, index_op); - locB = &XEXP (x, !index_op); - index_code = GET_CODE (*locI); - } - else if (code0 == REG) - { - locI = &XEXP (x, 0); - locB = &XEXP (x, 1); - index_code = GET_CODE (*locI); - } - else if (code1 == REG) - { - locI = &XEXP (x, 1); - locB = &XEXP (x, 0); - index_code = GET_CODE (*locI); - } - - if (locI) - changed |= replace_oldest_value_addr (locI, INDEX_REG_CLASS, - mode, as, insn, vd); - if (locB) - changed |= replace_oldest_value_addr (locB, - base_reg_class (mode, as, PLUS, - index_code), - mode, as, insn, vd); - return changed; - } - - case POST_INC: - case POST_DEC: - case POST_MODIFY: - case PRE_INC: - case PRE_DEC: - case PRE_MODIFY: - return false; - - case MEM: - return replace_oldest_value_mem (x, insn, vd); - - case REG: - return replace_oldest_value_reg (loc, cl, insn, vd); - - default: - break; - } - - fmt = GET_RTX_FORMAT (code); - for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) - { - if (fmt[i] == 'e') - changed |= replace_oldest_value_addr (&XEXP (x, i), cl, mode, as, - insn, vd); - else if (fmt[i] == 'E') - for (j = XVECLEN (x, i) - 1; j >= 0; j--) - changed |= replace_oldest_value_addr (&XVECEXP (x, i, j), cl, - mode, as, insn, vd); - } - - return changed; -} - -/* Similar to replace_oldest_value_reg, but X contains a memory. */ - -static bool -replace_oldest_value_mem (rtx x, rtx insn, struct value_data *vd) -{ - enum reg_class cl; - - if (DEBUG_INSN_P (insn)) - cl = ALL_REGS; - else - cl = base_reg_class (GET_MODE (x), MEM_ADDR_SPACE (x), MEM, SCRATCH); - - return replace_oldest_value_addr (&XEXP (x, 0), cl, - GET_MODE (x), MEM_ADDR_SPACE (x), - insn, vd); -} - -/* Apply all queued updates for DEBUG_INSNs that change some reg to - register REGNO. */ - -static void -apply_debug_insn_changes (struct value_data *vd, unsigned int regno) -{ - struct queued_debug_insn_change *change; - rtx last_insn = vd->e[regno].debug_insn_changes->insn; - - for (change = vd->e[regno].debug_insn_changes; - change; - change = change->next) - { - if (last_insn != change->insn) - { - apply_change_group (); - last_insn = change->insn; - } - validate_change (change->insn, change->loc, change->new_rtx, 1); - } - apply_change_group (); -} - -/* Called via for_each_rtx, for all used registers in a real - insn apply DEBUG_INSN changes that change registers to the - used register. */ - -static int -cprop_find_used_regs_1 (rtx *loc, void *data) -{ - if (REG_P (*loc)) - { - struct value_data *vd = (struct value_data *) data; - if (vd->e[REGNO (*loc)].debug_insn_changes) - { - apply_debug_insn_changes (vd, REGNO (*loc)); - free_debug_insn_changes (vd, REGNO (*loc)); - } - } - return 0; -} - -/* Called via note_uses, for all used registers in a real insn - apply DEBUG_INSN changes that change registers to the used - registers. */ - -static void -cprop_find_used_regs (rtx *loc, void *vd) -{ - for_each_rtx (loc, cprop_find_used_regs_1, vd); -} - -/* Perform the forward copy propagation on basic block BB. */ - -static bool -copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd) -{ - bool anything_changed = false; - rtx insn; - - for (insn = BB_HEAD (bb); ; insn = NEXT_INSN (insn)) - { - int n_ops, i, alt, predicated; - bool is_asm, any_replacements; - rtx set; - bool replaced[MAX_RECOG_OPERANDS]; - bool changed = false; - struct kill_set_value_data ksvd; - - if (!NONDEBUG_INSN_P (insn)) - { - if (DEBUG_INSN_P (insn)) - { - rtx loc = INSN_VAR_LOCATION_LOC (insn); - if (!VAR_LOC_UNKNOWN_P (loc)) - replace_oldest_value_addr (&INSN_VAR_LOCATION_LOC (insn), - ALL_REGS, GET_MODE (loc), - ADDR_SPACE_GENERIC, insn, vd); - } - - if (insn == BB_END (bb)) - break; - else - continue; - } - - set = single_set (insn); - extract_insn (insn); - if (! constrain_operands (1)) - fatal_insn_not_found (insn); - preprocess_constraints (); - alt = which_alternative; - n_ops = recog_data.n_operands; - is_asm = asm_noperands (PATTERN (insn)) >= 0; - - /* Simplify the code below by rewriting things to reflect - matching constraints. Also promote OP_OUT to OP_INOUT - in predicated instructions. */ - - predicated = GET_CODE (PATTERN (insn)) == COND_EXEC; - for (i = 0; i < n_ops; ++i) - { - int matches = recog_op_alt[i][alt].matches; - if (matches >= 0) - recog_op_alt[i][alt].cl = recog_op_alt[matches][alt].cl; - if (matches >= 0 || recog_op_alt[i][alt].matched >= 0 - || (predicated && recog_data.operand_type[i] == OP_OUT)) - recog_data.operand_type[i] = OP_INOUT; - } - - /* Apply changes to earlier DEBUG_INSNs if possible. */ - if (vd->n_debug_insn_changes) - note_uses (&PATTERN (insn), cprop_find_used_regs, vd); - - /* For each earlyclobber operand, zap the value data. */ - for (i = 0; i < n_ops; i++) - if (recog_op_alt[i][alt].earlyclobber) - kill_value (recog_data.operand[i], vd); - - /* Within asms, a clobber cannot overlap inputs or outputs. - I wouldn't think this were true for regular insns, but - scan_rtx treats them like that... */ - note_stores (PATTERN (insn), kill_clobbered_value, vd); - - /* Kill all auto-incremented values. */ - /* ??? REG_INC is useless, since stack pushes aren't done that way. */ - for_each_rtx (&PATTERN (insn), kill_autoinc_value, vd); - - /* Kill all early-clobbered operands. */ - for (i = 0; i < n_ops; i++) - if (recog_op_alt[i][alt].earlyclobber) - kill_value (recog_data.operand[i], vd); - - /* Special-case plain move instructions, since we may well - be able to do the move from a different register class. */ - if (set && REG_P (SET_SRC (set))) - { - rtx src = SET_SRC (set); - unsigned int regno = REGNO (src); - enum machine_mode mode = GET_MODE (src); - unsigned int i; - rtx new_rtx; - - /* If we are accessing SRC in some mode other that what we - set it in, make sure that the replacement is valid. */ - if (mode != vd->e[regno].mode) - { - if (hard_regno_nregs[regno][mode] - > hard_regno_nregs[regno][vd->e[regno].mode]) - goto no_move_special_case; - - /* And likewise, if we are narrowing on big endian the transformation - is also invalid. */ - if (hard_regno_nregs[regno][mode] - < hard_regno_nregs[regno][vd->e[regno].mode] - && (GET_MODE_SIZE (vd->e[regno].mode) > UNITS_PER_WORD - ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) - goto no_move_special_case; - } - - /* If the destination is also a register, try to find a source - register in the same class. */ - if (REG_P (SET_DEST (set))) - { - new_rtx = find_oldest_value_reg (REGNO_REG_CLASS (regno), src, vd); - if (new_rtx && validate_change (insn, &SET_SRC (set), new_rtx, 0)) - { - if (dump_file) - fprintf (dump_file, - "insn %u: replaced reg %u with %u\n", - INSN_UID (insn), regno, REGNO (new_rtx)); - changed = true; - goto did_replacement; - } - /* We need to re-extract as validate_change clobbers - recog_data. */ - extract_insn (insn); - if (! constrain_operands (1)) - fatal_insn_not_found (insn); - preprocess_constraints (); - } - - /* Otherwise, try all valid registers and see if its valid. */ - for (i = vd->e[regno].oldest_regno; i != regno; - i = vd->e[i].next_regno) - { - new_rtx = maybe_mode_change (vd->e[i].mode, vd->e[regno].mode, - mode, i, regno); - if (new_rtx != NULL_RTX) - { - if (validate_change (insn, &SET_SRC (set), new_rtx, 0)) - { - ORIGINAL_REGNO (new_rtx) = ORIGINAL_REGNO (src); - REG_ATTRS (new_rtx) = REG_ATTRS (src); - REG_POINTER (new_rtx) = REG_POINTER (src); - if (dump_file) - fprintf (dump_file, - "insn %u: replaced reg %u with %u\n", - INSN_UID (insn), regno, REGNO (new_rtx)); - changed = true; - goto did_replacement; - } - /* We need to re-extract as validate_change clobbers - recog_data. */ - extract_insn (insn); - if (! constrain_operands (1)) - fatal_insn_not_found (insn); - preprocess_constraints (); - } - } - } - no_move_special_case: - - any_replacements = false; - - /* For each input operand, replace a hard register with the - eldest live copy that's in an appropriate register class. */ - for (i = 0; i < n_ops; i++) - { - replaced[i] = false; - - /* Don't scan match_operand here, since we've no reg class - information to pass down. Any operands that we could - substitute in will be represented elsewhere. */ - if (recog_data.constraints[i][0] == '\0') - continue; - - /* Don't replace in asms intentionally referencing hard regs. */ - if (is_asm && REG_P (recog_data.operand[i]) - && (REGNO (recog_data.operand[i]) - == ORIGINAL_REGNO (recog_data.operand[i]))) - continue; - - if (recog_data.operand_type[i] == OP_IN) - { - if (recog_op_alt[i][alt].is_address) - replaced[i] - = replace_oldest_value_addr (recog_data.operand_loc[i], - recog_op_alt[i][alt].cl, - VOIDmode, ADDR_SPACE_GENERIC, - insn, vd); - else if (REG_P (recog_data.operand[i])) - replaced[i] - = replace_oldest_value_reg (recog_data.operand_loc[i], - recog_op_alt[i][alt].cl, - insn, vd); - else if (MEM_P (recog_data.operand[i])) - replaced[i] = replace_oldest_value_mem (recog_data.operand[i], - insn, vd); - } - else if (MEM_P (recog_data.operand[i])) - replaced[i] = replace_oldest_value_mem (recog_data.operand[i], - insn, vd); - - /* If we performed any replacement, update match_dups. */ - if (replaced[i]) - { - int j; - rtx new_rtx; - - new_rtx = *recog_data.operand_loc[i]; - recog_data.operand[i] = new_rtx; - for (j = 0; j < recog_data.n_dups; j++) - if (recog_data.dup_num[j] == i) - validate_unshare_change (insn, recog_data.dup_loc[j], new_rtx, 1); - - any_replacements = true; - } - } - - if (any_replacements) - { - if (! apply_change_group ()) - { - for (i = 0; i < n_ops; i++) - if (replaced[i]) - { - rtx old = *recog_data.operand_loc[i]; - recog_data.operand[i] = old; - } - - if (dump_file) - fprintf (dump_file, - "insn %u: reg replacements not verified\n", - INSN_UID (insn)); - } - else - changed = true; - } - - did_replacement: - if (changed) - { - anything_changed = true; - - /* If something changed, perhaps further changes to earlier - DEBUG_INSNs can be applied. */ - if (vd->n_debug_insn_changes) - note_uses (&PATTERN (insn), cprop_find_used_regs, vd); - } - - ksvd.vd = vd; - ksvd.ignore_set_reg = NULL_RTX; - - /* Clobber call-clobbered registers. */ - if (CALL_P (insn)) - { - unsigned int set_regno = INVALID_REGNUM; - unsigned int set_nregs = 0; - unsigned int regno; - rtx exp; - hard_reg_set_iterator hrsi; - - for (exp = CALL_INSN_FUNCTION_USAGE (insn); exp; exp = XEXP (exp, 1)) - { - rtx x = XEXP (exp, 0); - if (GET_CODE (x) == SET) - { - rtx dest = SET_DEST (x); - kill_value (dest, vd); - set_value_regno (REGNO (dest), GET_MODE (dest), vd); - copy_value (dest, SET_SRC (x), vd); - ksvd.ignore_set_reg = dest; - set_regno = REGNO (dest); - set_nregs - = hard_regno_nregs[set_regno][GET_MODE (dest)]; - break; - } - } - - EXECUTE_IF_SET_IN_HARD_REG_SET (regs_invalidated_by_call, 0, regno, hrsi) - if (regno < set_regno || regno >= set_regno + set_nregs) - kill_value_regno (regno, 1, vd); - - /* If SET was seen in CALL_INSN_FUNCTION_USAGE, and SET_SRC - of the SET isn't in regs_invalidated_by_call hard reg set, - but instead among CLOBBERs on the CALL_INSN, we could wrongly - assume the value in it is still live. */ - if (ksvd.ignore_set_reg) - note_stores (PATTERN (insn), kill_clobbered_value, vd); - } - - /* Notice stores. */ - note_stores (PATTERN (insn), kill_set_value, &ksvd); - - /* Notice copies. */ - if (set && REG_P (SET_DEST (set)) && REG_P (SET_SRC (set))) - copy_value (SET_DEST (set), SET_SRC (set), vd); - - if (insn == BB_END (bb)) - break; - } - - return anything_changed; -} - -/* Main entry point for the forward copy propagation optimization. */ - -static unsigned int -copyprop_hardreg_forward (void) -{ - struct value_data *all_vd; - basic_block bb; - sbitmap visited; - bool analyze_called = false; - - all_vd = XNEWVEC (struct value_data, last_basic_block); - - visited = sbitmap_alloc (last_basic_block); - bitmap_clear (visited); - - if (MAY_HAVE_DEBUG_INSNS) - debug_insn_changes_pool - = create_alloc_pool ("debug insn changes pool", - sizeof (struct queued_debug_insn_change), 256); - - FOR_EACH_BB (bb) - { - bitmap_set_bit (visited, bb->index); - - /* If a block has a single predecessor, that we've already - processed, begin with the value data that was live at - the end of the predecessor block. */ - /* ??? Ought to use more intelligent queuing of blocks. */ - if (single_pred_p (bb) - && bitmap_bit_p (visited, single_pred (bb)->index) - && ! (single_pred_edge (bb)->flags & (EDGE_ABNORMAL_CALL | EDGE_EH))) - { - all_vd[bb->index] = all_vd[single_pred (bb)->index]; - if (all_vd[bb->index].n_debug_insn_changes) - { - unsigned int regno; - - for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) - { - if (all_vd[bb->index].e[regno].debug_insn_changes) - { - all_vd[bb->index].e[regno].debug_insn_changes = NULL; - if (--all_vd[bb->index].n_debug_insn_changes == 0) - break; - } - } - } - } - else - init_value_data (all_vd + bb->index); - - copyprop_hardreg_forward_1 (bb, all_vd + bb->index); - } - - if (MAY_HAVE_DEBUG_INSNS) - { - FOR_EACH_BB (bb) - if (bitmap_bit_p (visited, bb->index) - && all_vd[bb->index].n_debug_insn_changes) - { - unsigned int regno; - bitmap live; - - if (!analyze_called) - { - df_analyze (); - analyze_called = true; - } - live = df_get_live_out (bb); - for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) - if (all_vd[bb->index].e[regno].debug_insn_changes) - { - if (REGNO_REG_SET_P (live, regno)) - apply_debug_insn_changes (all_vd + bb->index, regno); - if (all_vd[bb->index].n_debug_insn_changes == 0) - break; - } - } - - free_alloc_pool (debug_insn_changes_pool); - } - - sbitmap_free (visited); - free (all_vd); - return 0; -} - -/* Dump the value chain data to stderr. */ - -DEBUG_FUNCTION void -debug_value_data (struct value_data *vd) -{ - HARD_REG_SET set; - unsigned int i, j; - - CLEAR_HARD_REG_SET (set); - - for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) - if (vd->e[i].oldest_regno == i) - { - if (vd->e[i].mode == VOIDmode) - { - if (vd->e[i].next_regno != INVALID_REGNUM) - fprintf (stderr, "[%u] Bad next_regno for empty chain (%u)\n", - i, vd->e[i].next_regno); - continue; - } - - SET_HARD_REG_BIT (set, i); - fprintf (stderr, "[%u %s] ", i, GET_MODE_NAME (vd->e[i].mode)); - - for (j = vd->e[i].next_regno; - j != INVALID_REGNUM; - j = vd->e[j].next_regno) - { - if (TEST_HARD_REG_BIT (set, j)) - { - fprintf (stderr, "[%u] Loop in regno chain\n", j); - return; - } - - if (vd->e[j].oldest_regno != i) - { - fprintf (stderr, "[%u] Bad oldest_regno (%u)\n", - j, vd->e[j].oldest_regno); - return; - } - SET_HARD_REG_BIT (set, j); - fprintf (stderr, "[%u %s] ", j, GET_MODE_NAME (vd->e[j].mode)); - } - fputc ('\n', stderr); - } - - for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) - if (! TEST_HARD_REG_BIT (set, i) - && (vd->e[i].mode != VOIDmode - || vd->e[i].oldest_regno != i - || vd->e[i].next_regno != INVALID_REGNUM)) - fprintf (stderr, "[%u] Non-empty reg in chain (%s %u %i)\n", - i, GET_MODE_NAME (vd->e[i].mode), vd->e[i].oldest_regno, - vd->e[i].next_regno); -} - -#ifdef ENABLE_CHECKING -static void -validate_value_data (struct value_data *vd) -{ - HARD_REG_SET set; - unsigned int i, j; - - CLEAR_HARD_REG_SET (set); - - for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) - if (vd->e[i].oldest_regno == i) - { - if (vd->e[i].mode == VOIDmode) - { - if (vd->e[i].next_regno != INVALID_REGNUM) - internal_error ("validate_value_data: [%u] Bad next_regno for empty chain (%u)", - i, vd->e[i].next_regno); - continue; - } - - SET_HARD_REG_BIT (set, i); - - for (j = vd->e[i].next_regno; - j != INVALID_REGNUM; - j = vd->e[j].next_regno) - { - if (TEST_HARD_REG_BIT (set, j)) - internal_error ("validate_value_data: Loop in regno chain (%u)", - j); - if (vd->e[j].oldest_regno != i) - internal_error ("validate_value_data: [%u] Bad oldest_regno (%u)", - j, vd->e[j].oldest_regno); - - SET_HARD_REG_BIT (set, j); - } - } - - for (i = 0; i < FIRST_PSEUDO_REGISTER; ++i) - if (! TEST_HARD_REG_BIT (set, i) - && (vd->e[i].mode != VOIDmode - || vd->e[i].oldest_regno != i - || vd->e[i].next_regno != INVALID_REGNUM)) - internal_error ("validate_value_data: [%u] Non-empty reg in chain (%s %u %i)", - i, GET_MODE_NAME (vd->e[i].mode), vd->e[i].oldest_regno, - vd->e[i].next_regno); -} -#endif - -static bool -gate_handle_cprop (void) -{ - return (optimize > 0 && (flag_cprop_registers)); -} - - -struct rtl_opt_pass pass_cprop_hardreg = -{ - { - RTL_PASS, - "cprop_hardreg", /* name */ - OPTGROUP_NONE, /* optinfo_flags */ - gate_handle_cprop, /* gate */ - copyprop_hardreg_forward, /* execute */ - NULL, /* sub */ - NULL, /* next */ - 0, /* static_pass_number */ - TV_CPROP_REGISTERS, /* tv_id */ - 0, /* properties_required */ - 0, /* properties_provided */ - 0, /* properties_destroyed */ - 0, /* todo_flags_start */ - TODO_df_finish - | TODO_verify_rtl_sharing /* todo_flags_finish */ - } -}; |