From b9666a04899b8427ad99256361691ad4f08d17b2 Mon Sep 17 00:00:00 2001 From: Marc Espie Date: Wed, 26 May 1999 16:30:51 +0000 Subject: So long, and thanks for all the bugs. --- gnu/usr.bin/gcc/caller-save.c | 760 ------------------------------------------ 1 file changed, 760 deletions(-) delete mode 100644 gnu/usr.bin/gcc/caller-save.c (limited to 'gnu/usr.bin/gcc/caller-save.c') diff --git a/gnu/usr.bin/gcc/caller-save.c b/gnu/usr.bin/gcc/caller-save.c deleted file mode 100644 index a6d45ac4c11..00000000000 --- a/gnu/usr.bin/gcc/caller-save.c +++ /dev/null @@ -1,760 +0,0 @@ -/* Save and restore call-clobbered registers which are live across a call. - Copyright (C) 1989, 1992, 1994, 1995, 1997 Free Software Foundation, Inc. - -This file is part of GNU CC. - -GNU CC 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 2, or (at your option) -any later version. - -GNU CC 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 GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ - -#include "config.h" -#include -#include "rtl.h" -#include "insn-config.h" -#include "flags.h" -#include "regs.h" -#include "hard-reg-set.h" -#include "recog.h" -#include "basic-block.h" -#include "reload.h" -#include "expr.h" - -#ifndef MAX_MOVE_MAX -#define MAX_MOVE_MAX MOVE_MAX -#endif - -#ifndef MIN_UNITS_PER_WORD -#define MIN_UNITS_PER_WORD UNITS_PER_WORD -#endif - -/* Modes for each hard register that we can save. The smallest mode is wide - enough to save the entire contents of the register. When saving the - register because it is live we first try to save in multi-register modes. - If that is not possible the save is done one register at a time. */ - -static enum machine_mode - regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1]; - -/* For each hard register, a place on the stack where it can be saved, - if needed. */ - -static rtx - regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1]; - -/* We will only make a register eligible for caller-save if it can be - saved in its widest mode with a simple SET insn as long as the memory - address is valid. We record the INSN_CODE is those insns here since - when we emit them, the addresses might not be valid, so they might not - be recognized. */ - -static enum insn_code - reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1]; -static enum insn_code - reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1]; - -/* Set of hard regs currently live (during scan of all insns). */ - -static HARD_REG_SET hard_regs_live; - -/* Set of hard regs currently residing in save area (during insn scan). */ - -static HARD_REG_SET hard_regs_saved; - -/* Set of hard regs which need to be restored before referenced. */ - -static HARD_REG_SET hard_regs_need_restore; - -/* Number of registers currently in hard_regs_saved. */ - -int n_regs_saved; - -static void set_reg_live PROTO((rtx, rtx)); -static void clear_reg_live PROTO((rtx)); -static void restore_referenced_regs PROTO((rtx, rtx, enum machine_mode)); -static int insert_save_restore PROTO((rtx, int, int, - enum machine_mode, int)); - -/* Initialize for caller-save. - - Look at all the hard registers that are used by a call and for which - regclass.c has not already excluded from being used across a call. - - Ensure that we can find a mode to save the register and that there is a - simple insn to save and restore the register. This latter check avoids - problems that would occur if we tried to save the MQ register of some - machines directly into memory. */ - -void -init_caller_save () -{ - char *first_obj = (char *) oballoc (0); - rtx addr_reg; - int offset; - rtx address; - int i, j; - - /* First find all the registers that we need to deal with and all - the modes that they can have. If we can't find a mode to use, - we can't have the register live over calls. */ - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - { - if (call_used_regs[i] && ! call_fixed_regs[i]) - { - for (j = 1; j <= MOVE_MAX / UNITS_PER_WORD; j++) - { - regno_save_mode[i][j] = choose_hard_reg_mode (i, j); - if (regno_save_mode[i][j] == VOIDmode && j == 1) - { - call_fixed_regs[i] = 1; - SET_HARD_REG_BIT (call_fixed_reg_set, i); - } - } - } - else - regno_save_mode[i][1] = VOIDmode; - } - - /* The following code tries to approximate the conditions under which - we can easily save and restore a register without scratch registers or - other complexities. It will usually work, except under conditions where - the validity of an insn operand is dependent on the address offset. - No such cases are currently known. - - We first find a typical offset from some BASE_REG_CLASS register. - This address is chosen by finding the first register in the class - and by finding the smallest power of two that is a valid offset from - that register in every mode we will use to save registers. */ - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - if (TEST_HARD_REG_BIT (reg_class_contents[(int) BASE_REG_CLASS], i)) - break; - - if (i == FIRST_PSEUDO_REGISTER) - abort (); - - addr_reg = gen_rtx (REG, Pmode, i); - - for (offset = 1 << (HOST_BITS_PER_INT / 2); offset; offset >>= 1) - { - address = gen_rtx (PLUS, Pmode, addr_reg, GEN_INT (offset)); - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - if (regno_save_mode[i][1] != VOIDmode - && ! strict_memory_address_p (regno_save_mode[i][1], address)) - break; - - if (i == FIRST_PSEUDO_REGISTER) - break; - } - - /* If we didn't find a valid address, we must use register indirect. */ - if (offset == 0) - address = addr_reg; - - /* Next we try to form an insn to save and restore the register. We - see if such an insn is recognized and meets its constraints. */ - - start_sequence (); - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - for (j = 1; j <= MOVE_MAX / UNITS_PER_WORD; j++) - if (regno_save_mode[i][j] != VOIDmode) - { - rtx mem = gen_rtx (MEM, regno_save_mode[i][j], address); - rtx reg = gen_rtx (REG, regno_save_mode[i][j], i); - rtx savepat = gen_rtx (SET, VOIDmode, mem, reg); - rtx restpat = gen_rtx (SET, VOIDmode, reg, mem); - rtx saveinsn = emit_insn (savepat); - rtx restinsn = emit_insn (restpat); - int ok; - - reg_save_code[i][j] = recog_memoized (saveinsn); - reg_restore_code[i][j] = recog_memoized (restinsn); - - /* Now extract both insns and see if we can meet their - constraints. */ - ok = (reg_save_code[i][j] != -1 && reg_restore_code[i][j] != -1); - if (ok) - { - insn_extract (saveinsn); - ok = constrain_operands (reg_save_code[i][j], 1); - insn_extract (restinsn); - ok &= constrain_operands (reg_restore_code[i][j], 1); - } - - if (! ok) - { - regno_save_mode[i][j] = VOIDmode; - if (j == 1) - { - call_fixed_regs[i] = 1; - SET_HARD_REG_BIT (call_fixed_reg_set, i); - } - } - } - - end_sequence (); - - obfree (first_obj); -} - -/* Initialize save areas by showing that we haven't allocated any yet. */ - -void -init_save_areas () -{ - int i, j; - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - for (j = 1; j <= MOVE_MAX / UNITS_PER_WORD; j++) - regno_save_mem[i][j] = 0; -} - -/* Allocate save areas for any hard registers that might need saving. - We take a conservative approach here and look for call-clobbered hard - registers that are assigned to pseudos that cross calls. This may - overestimate slightly (especially if some of these registers are later - used as spill registers), but it should not be significant. - - Then perform register elimination in the addresses of the save area - locations; return 1 if all eliminated addresses are strictly valid. - We assume that our caller has set up the elimination table to the - worst (largest) possible offsets. - - Set *PCHANGED to 1 if we had to allocate some memory for the save area. - - Future work: - - In the fallback case we should iterate backwards across all possible - modes for the save, choosing the largest available one instead of - falling back to the smallest mode immediately. (eg TF -> DF -> SF). - - We do not try to use "move multiple" instructions that exist - on some machines (such as the 68k moveml). It could be a win to try - and use them when possible. The hard part is doing it in a way that is - machine independent since they might be saving non-consecutive - registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */ - -int -setup_save_areas (pchanged) - int *pchanged; -{ - int i, j, k; - HARD_REG_SET hard_regs_used; - int ok = 1; - - - /* Allocate space in the save area for the largest multi-register - pseudos first, then work backwards to single register - pseudos. */ - - /* Find and record all call-used hard-registers in this function. */ - CLEAR_HARD_REG_SET (hard_regs_used); - for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++) - if (reg_renumber[i] >= 0 && REG_N_CALLS_CROSSED (i) > 0) - { - int regno = reg_renumber[i]; - int endregno - = regno + HARD_REGNO_NREGS (regno, GET_MODE (regno_reg_rtx[i])); - int nregs = endregno - regno; - - for (j = 0; j < nregs; j++) - { - if (call_used_regs[regno+j]) - SET_HARD_REG_BIT (hard_regs_used, regno+j); - } - } - - /* Now run through all the call-used hard-registers and allocate - space for them in the caller-save area. Try to allocate space - in a manner which allows multi-register saves/restores to be done. */ - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - for (j = MOVE_MAX / UNITS_PER_WORD; j > 0; j--) - { - int ok = 1; - int do_save; - - /* If no mode exists for this size, try another. Also break out - if we have already saved this hard register. */ - if (regno_save_mode[i][j] == VOIDmode || regno_save_mem[i][1] != 0) - continue; - - /* See if any register in this group has been saved. */ - do_save = 1; - for (k = 0; k < j; k++) - if (regno_save_mem[i + k][1]) - { - do_save = 0; - break; - } - if (! do_save) - continue; - - for (k = 0; k < j; k++) - { - int regno = i + k; - ok &= (TEST_HARD_REG_BIT (hard_regs_used, regno) != 0); - } - - /* We have found an acceptable mode to store in. */ - if (ok) - { - - regno_save_mem[i][j] - = assign_stack_local (regno_save_mode[i][j], - GET_MODE_SIZE (regno_save_mode[i][j]), 0); - - /* Setup single word save area just in case... */ - for (k = 0; k < j; k++) - { - /* This should not depend on WORDS_BIG_ENDIAN. - The order of words in regs is the same as in memory. */ - rtx temp = gen_rtx (MEM, regno_save_mode[i+k][1], - XEXP (regno_save_mem[i][j], 0)); - - regno_save_mem[i+k][1] - = adj_offsettable_operand (temp, k * UNITS_PER_WORD); - } - *pchanged = 1; - } - } - - for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - for (j = 1; j <= MOVE_MAX / UNITS_PER_WORD; j++) - if (regno_save_mem[i][j] != 0) - ok &= strict_memory_address_p (GET_MODE (regno_save_mem[i][j]), - XEXP (eliminate_regs (regno_save_mem[i][j], 0, NULL_RTX, 1), 0)); - - return ok; -} - -/* Find the places where hard regs are live across calls and save them. - - INSN_MODE is the mode to assign to any insns that we add. This is used - by reload to determine whether or not reloads or register eliminations - need be done on these insns. */ - -void -save_call_clobbered_regs (insn_mode) - enum machine_mode insn_mode; -{ - rtx insn; - int b; - - for (b = 0; b < n_basic_blocks; b++) - { - regset regs_live = basic_block_live_at_start[b]; - rtx prev_block_last = PREV_INSN (basic_block_head[b]); - int i, j; - int regno; - - /* Compute hard regs live at start of block -- this is the - real hard regs marked live, plus live pseudo regs that - have been renumbered to hard regs. No registers have yet been - saved because we restore all of them before the end of the basic - block. */ - - REG_SET_TO_HARD_REG_SET (hard_regs_live, regs_live); - CLEAR_HARD_REG_SET (hard_regs_saved); - CLEAR_HARD_REG_SET (hard_regs_need_restore); - n_regs_saved = 0; - - EXECUTE_IF_SET_IN_REG_SET (regs_live, 0, i, - { - if ((regno = reg_renumber[i]) >= 0) - for (j = regno; - j < regno + HARD_REGNO_NREGS (regno, - PSEUDO_REGNO_MODE (i)); - j++) - SET_HARD_REG_BIT (hard_regs_live, j); - }); - - /* Now scan the insns in the block, keeping track of what hard - regs are live as we go. When we see a call, save the live - call-clobbered hard regs. */ - - for (insn = basic_block_head[b]; ; insn = NEXT_INSN (insn)) - { - RTX_CODE code = GET_CODE (insn); - - if (GET_RTX_CLASS (code) == 'i') - { - rtx link; - - /* If some registers have been saved, see if INSN references - any of them. We must restore them before the insn if so. */ - - if (n_regs_saved) - restore_referenced_regs (PATTERN (insn), insn, insn_mode); - - /* NB: the normal procedure is to first enliven any - registers set by insn, then deaden any registers that - had their last use at insn. This is incorrect now, - since multiple pseudos may have been mapped to the - same hard reg, and the death notes are ambiguous. So - it must be done in the other, safe, order. */ - - for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) - if (REG_NOTE_KIND (link) == REG_DEAD) - clear_reg_live (XEXP (link, 0)); - - /* When we reach a call, we need to save all registers that are - live, call-used, not fixed, and not already saved. We must - test at this point because registers that die in a CALL_INSN - are not live across the call and likewise for registers that - are born in the CALL_INSN. - - If registers are filled with parameters for this function, - and some of these are also being set by this function, then - they will not appear to die (no REG_DEAD note for them), - to check if in fact they do, collect the set registers in - hard_regs_live first. */ - - if (code == CALL_INSN) - { - HARD_REG_SET this_call_sets; - { - HARD_REG_SET old_hard_regs_live; - - /* Save the hard_regs_live information. */ - COPY_HARD_REG_SET (old_hard_regs_live, hard_regs_live); - - /* Now calculate hard_regs_live for this CALL_INSN - only. */ - CLEAR_HARD_REG_SET (hard_regs_live); - note_stores (PATTERN (insn), set_reg_live); - COPY_HARD_REG_SET (this_call_sets, hard_regs_live); - - /* Restore the hard_regs_live information. */ - COPY_HARD_REG_SET (hard_regs_live, old_hard_regs_live); - } - - for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) - if (call_used_regs[regno] && ! call_fixed_regs[regno] - && TEST_HARD_REG_BIT (hard_regs_live, regno) - /* It must not be set by this instruction. */ - && ! TEST_HARD_REG_BIT (this_call_sets, regno) - && ! TEST_HARD_REG_BIT (hard_regs_saved, regno)) - regno += insert_save_restore (insn, 1, regno, - insn_mode, 0); - - /* Put the information for this CALL_INSN on top of what - we already had. */ - IOR_HARD_REG_SET (hard_regs_live, this_call_sets); - COPY_HARD_REG_SET (hard_regs_need_restore, hard_regs_saved); - - /* Must recompute n_regs_saved. */ - n_regs_saved = 0; - for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) - if (TEST_HARD_REG_BIT (hard_regs_saved, regno)) - n_regs_saved++; - } - else - { - note_stores (PATTERN (insn), set_reg_live); -#ifdef AUTO_INC_DEC - for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) - if (REG_NOTE_KIND (link) == REG_INC) - set_reg_live (XEXP (link, 0), NULL_RTX); -#endif - } - - for (link = REG_NOTES (insn); link; link = XEXP (link, 1)) - if (REG_NOTE_KIND (link) == REG_UNUSED) - clear_reg_live (XEXP (link, 0)); - } - - if (insn == basic_block_end[b]) - break; - } - - /* At the end of the basic block, we must restore any registers that - remain saved. If the last insn in the block is a JUMP_INSN, put - the restore before the insn, otherwise, put it after the insn. */ - - if (n_regs_saved) - for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) - if (TEST_HARD_REG_BIT (hard_regs_need_restore, regno)) - regno += insert_save_restore ((GET_CODE (insn) == JUMP_INSN - ? insn : NEXT_INSN (insn)), 0, - regno, insn_mode, MOVE_MAX / UNITS_PER_WORD); - - /* If we added any insns at the start of the block, update the start - of the block to point at those insns. */ - basic_block_head[b] = NEXT_INSN (prev_block_last); - } -} - -/* Here from note_stores when an insn stores a value in a register. - Set the proper bit or bits in hard_regs_live. All pseudos that have - been assigned hard regs have had their register number changed already, - so we can ignore pseudos. */ - -static void -set_reg_live (reg, setter) - rtx reg, setter; -{ - register int regno, endregno, i; - enum machine_mode mode = GET_MODE (reg); - int word = 0; - - if (GET_CODE (reg) == SUBREG) - { - word = SUBREG_WORD (reg); - reg = SUBREG_REG (reg); - } - - if (GET_CODE (reg) != REG || REGNO (reg) >= FIRST_PSEUDO_REGISTER) - return; - - regno = REGNO (reg) + word; - endregno = regno + HARD_REGNO_NREGS (regno, mode); - - for (i = regno; i < endregno; i++) - { - SET_HARD_REG_BIT (hard_regs_live, i); - CLEAR_HARD_REG_BIT (hard_regs_saved, i); - CLEAR_HARD_REG_BIT (hard_regs_need_restore, i); - } -} - -/* Here when a REG_DEAD note records the last use of a reg. Clear - the appropriate bit or bits in hard_regs_live. Again we can ignore - pseudos. */ - -static void -clear_reg_live (reg) - rtx reg; -{ - register int regno, endregno, i; - - if (GET_CODE (reg) != REG || REGNO (reg) >= FIRST_PSEUDO_REGISTER) - return; - - regno = REGNO (reg); - endregno= regno + HARD_REGNO_NREGS (regno, GET_MODE (reg)); - - for (i = regno; i < endregno; i++) - { - CLEAR_HARD_REG_BIT (hard_regs_live, i); - CLEAR_HARD_REG_BIT (hard_regs_need_restore, i); - CLEAR_HARD_REG_BIT (hard_regs_saved, i); - } -} - -/* If any register currently residing in the save area is referenced in X, - which is part of INSN, emit code to restore the register in front of INSN. - INSN_MODE is the mode to assign to any insns that we add. */ - -static void -restore_referenced_regs (x, insn, insn_mode) - rtx x; - rtx insn; - enum machine_mode insn_mode; -{ - enum rtx_code code = GET_CODE (x); - char *fmt; - int i, j; - - if (code == CLOBBER) - return; - - if (code == REG) - { - int regno = REGNO (x); - - /* If this is a pseudo, scan its memory location, since it might - involve the use of another register, which might be saved. */ - - if (regno >= FIRST_PSEUDO_REGISTER - && reg_equiv_mem[regno] != 0) - restore_referenced_regs (XEXP (reg_equiv_mem[regno], 0), - insn, insn_mode); - else if (regno >= FIRST_PSEUDO_REGISTER - && reg_equiv_address[regno] != 0) - restore_referenced_regs (reg_equiv_address[regno], - insn, insn_mode); - - /* Otherwise if this is a hard register, restore any piece of it that - is currently saved. */ - - else if (regno < FIRST_PSEUDO_REGISTER) - { - int numregs = HARD_REGNO_NREGS (regno, GET_MODE (x)); - /* Save at most SAVEREGS at a time. This can not be larger than - MOVE_MAX, because that causes insert_save_restore to fail. */ - int saveregs = MIN (numregs, MOVE_MAX / UNITS_PER_WORD); - int endregno = regno + numregs; - - for (i = regno; i < endregno; i++) - if (TEST_HARD_REG_BIT (hard_regs_need_restore, i)) - i += insert_save_restore (insn, 0, i, insn_mode, saveregs); - } - - return; - } - - fmt = GET_RTX_FORMAT (code); - for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--) - { - if (fmt[i] == 'e') - restore_referenced_regs (XEXP (x, i), insn, insn_mode); - else if (fmt[i] == 'E') - for (j = XVECLEN (x, i) - 1; j >= 0; j--) - restore_referenced_regs (XVECEXP (x, i, j), insn, insn_mode); - } -} - -/* Insert a sequence of insns to save or restore, SAVE_P says which, - REGNO. Place these insns in front of INSN. INSN_MODE is the mode - to assign to these insns. MAXRESTORE is the maximum number of registers - which should be restored during this call (when SAVE_P == 0). It should - never be less than 1 since we only work with entire registers. - - Note that we have verified in init_caller_save that we can do this - with a simple SET, so use it. Set INSN_CODE to what we save there - since the address might not be valid so the insn might not be recognized. - These insns will be reloaded and have register elimination done by - find_reload, so we need not worry about that here. - - Return the extra number of registers saved. */ - -static int -insert_save_restore (insn, save_p, regno, insn_mode, maxrestore) - rtx insn; - int save_p; - int regno; - enum machine_mode insn_mode; - int maxrestore; -{ - rtx pat; - enum insn_code code; - int i, numregs; - - /* A common failure mode if register status is not correct in the RTL - is for this routine to be called with a REGNO we didn't expect to - save. That will cause us to write an insn with a (nil) SET_DEST - or SET_SRC. Instead of doing so and causing a crash later, check - for this common case and abort here instead. This will remove one - step in debugging such problems. */ - - if (regno_save_mem[regno][1] == 0) - abort (); - -#ifdef HAVE_cc0 - /* If INSN references CC0, put our insns in front of the insn that sets - CC0. This is always safe, since the only way we could be passed an - insn that references CC0 is for a restore, and doing a restore earlier - isn't a problem. We do, however, assume here that CALL_INSNs don't - reference CC0. Guard against non-INSN's like CODE_LABEL. */ - - if ((GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN) - && reg_referenced_p (cc0_rtx, PATTERN (insn))) - insn = prev_nonnote_insn (insn); -#endif - - /* Get the pattern to emit and update our status. */ - if (save_p) - { - int i, j, k; - int ok; - - /* See if we can save several registers with a single instruction. - Work backwards to the single register case. */ - for (i = MOVE_MAX / UNITS_PER_WORD; i > 0; i--) - { - ok = 1; - if (regno_save_mem[regno][i] != 0) - for (j = 0; j < i; j++) - { - if (! call_used_regs[regno + j] || call_fixed_regs[regno + j] - || ! TEST_HARD_REG_BIT (hard_regs_live, regno + j) - || TEST_HARD_REG_BIT (hard_regs_saved, regno + j)) - ok = 0; - } - else - continue; - - /* Must do this one save at a time */ - if (! ok) - continue; - - pat = gen_rtx (SET, VOIDmode, regno_save_mem[regno][i], - gen_rtx (REG, GET_MODE (regno_save_mem[regno][i]), regno)); - code = reg_save_code[regno][i]; - - /* Set hard_regs_saved for all the registers we saved. */ - for (k = 0; k < i; k++) - { - SET_HARD_REG_BIT (hard_regs_saved, regno + k); - SET_HARD_REG_BIT (hard_regs_need_restore, regno + k); - n_regs_saved++; - } - - numregs = i; - break; - } - } - else - { - int i, j, k; - int ok; - - /* See if we can restore `maxrestore' registers at once. Work - backwards to the single register case. */ - for (i = maxrestore; i > 0; i--) - { - ok = 1; - if (regno_save_mem[regno][i]) - for (j = 0; j < i; j++) - { - if (! TEST_HARD_REG_BIT (hard_regs_need_restore, regno + j)) - ok = 0; - } - else - continue; - - /* Must do this one restore at a time */ - if (! ok) - continue; - - pat = gen_rtx (SET, VOIDmode, - gen_rtx (REG, GET_MODE (regno_save_mem[regno][i]), - regno), - regno_save_mem[regno][i]); - code = reg_restore_code[regno][i]; - - - /* Clear status for all registers we restored. */ - for (k = 0; k < i; k++) - { - CLEAR_HARD_REG_BIT (hard_regs_need_restore, regno + k); - n_regs_saved--; - } - - numregs = i; - break; - } - } - /* Emit the insn and set the code and mode. */ - - insn = emit_insn_before (pat, insn); - PUT_MODE (insn, insn_mode); - INSN_CODE (insn) = code; - - /* Tell our callers how many extra registers we saved/restored */ - return numregs - 1; -} -- cgit v1.2.3