X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fcaller-save.c;h=b543874378860cc5a3dbd5a5931699adf95a7cbb;hb=b375f5b7057074735c4a27b5f36ffd7a8738e0cd;hp=7c390a5955eea9a9786bb2ae7cf28f3af2ea43e2;hpb=f4ac4e511a6e9e8c96c3e90c9ff3d04ba749a8a5;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/caller-save.c b/gcc/caller-save.c index 7c390a5955e..b5438743788 100644 --- a/gcc/caller-save.c +++ b/gcc/caller-save.c @@ -1,35 +1,40 @@ /* Save and restore call-clobbered registers which are live across a call. - Copyright (C) 1989, 1992, 94-95, 97, 98, 1999 Free Software Foundation, Inc. + Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, + 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. -This file is part of GNU CC. +This file is part of GCC. -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. +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 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. +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 GNU CC; see the file COPYING. If not, write to -the Free Software Foundation, 59 Temple Place - Suite 330, -Boston, MA 02111-1307, USA. */ +along with GCC; see the file COPYING. If not, write to the Free +Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301, USA. */ #include "config.h" #include "system.h" +#include "coretypes.h" +#include "tm.h" #include "rtl.h" +#include "regs.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 "function.h" #include "expr.h" #include "toplev.h" +#include "tm_p.h" #ifndef MAX_MOVE_MAX #define MAX_MOVE_MAX MOVE_MAX @@ -46,13 +51,13 @@ Boston, MA 02111-1307, USA. */ 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 +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 +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 @@ -61,10 +66,10 @@ static rtx 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]; +static int + reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; +static int + reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; /* Set of hard regs currently residing in save area (during insn scan). */ @@ -83,33 +88,37 @@ static HARD_REG_SET referenced_regs; static HARD_REG_SET this_insn_sets; -static void mark_set_regs PROTO((rtx, rtx)); -static void mark_referenced_regs PROTO((rtx)); -static int insert_save PROTO((struct insn_chain *, int, int, - HARD_REG_SET *)); -static int insert_restore PROTO((struct insn_chain *, int, int, - int)); -static void insert_one_insn PROTO((struct insn_chain *, int, - enum insn_code, rtx)); +static void mark_set_regs (rtx, rtx, void *); +static void mark_referenced_regs (rtx); +static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *, + enum machine_mode *); +static int insert_restore (struct insn_chain *, int, int, int, + enum machine_mode *); +static struct insn_chain *insert_one_insn (struct insn_chain *, int, int, + rtx); +static void add_stored_regs (rtx, rtx, void *); /* 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 + 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 () +init_caller_save (void) { - char *first_obj = (char *) oballoc (0); rtx addr_reg; int offset; rtx address; int i, j; + enum machine_mode mode; + rtx savepat, restpat; + rtx test_reg, test_mem; + rtx saveinsn, restinsn; /* 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, @@ -121,7 +130,8 @@ init_caller_save () { for (j = 1; j <= MOVE_MAX_WORDS; j++) { - regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j); + regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j, + VOIDmode); if (regno_save_mode[i][j] == VOIDmode && j == 1) { call_fixed_regs[i] = 1; @@ -145,11 +155,12 @@ init_caller_save () 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)) + if (TEST_HARD_REG_BIT + (reg_class_contents + [(int) MODE_BASE_REG_CLASS (regno_save_mode [i][1])], i)) break; - if (i == FIRST_PSEUDO_REGISTER) - abort (); + gcc_assert (i < FIRST_PSEUDO_REGISTER); addr_reg = gen_rtx_REG (Pmode, i); @@ -171,29 +182,42 @@ init_caller_save () 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. */ + see if such an insn is recognized and meets its constraints. + + To avoid lots of unnecessary RTL allocation, we construct all the RTL + once, then modify the memory and register operands in-place. */ + + test_reg = gen_rtx_REG (VOIDmode, 0); + test_mem = gen_rtx_MEM (VOIDmode, address); + savepat = gen_rtx_SET (VOIDmode, test_mem, test_reg); + restpat = gen_rtx_SET (VOIDmode, test_reg, test_mem); - start_sequence (); + saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, savepat, -1, 0, 0); + restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, restpat, -1, 0, 0); for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) - for (j = 1; j <= MOVE_MAX_WORDS; j++) - if (regno_save_mode[i][j] != VOIDmode) + for (mode = 0 ; mode < MAX_MACHINE_MODE; mode++) + if (HARD_REGNO_MODE_OK (i, mode)) { - 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); + /* Update the register number and modes of the register + and memory operand. */ + REGNO (test_reg) = i; + PUT_MODE (test_reg, mode); + PUT_MODE (test_mem, mode); + + /* Force re-recognition of the modified insns. */ + INSN_CODE (saveinsn) = -1; + INSN_CODE (restinsn) = -1; + + reg_save_code[i][mode] = recog_memoized (saveinsn); + reg_restore_code[i][mode] = recog_memoized (restinsn); /* Now extract both insns and see if we can meet their constraints. */ - ok = (reg_save_code[i][j] != (enum insn_code)-1 - && reg_restore_code[i][j] != (enum insn_code)-1); + ok = (reg_save_code[i][mode] != -1 + && reg_restore_code[i][mode] != -1); if (ok) { extract_insn (saveinsn); @@ -204,24 +228,33 @@ init_caller_save () 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); - } + reg_save_code[i][mode] = -1; + reg_restore_code[i][mode] = -1; } - } - - end_sequence (); + } + else + { + reg_save_code[i][mode] = -1; + reg_restore_code[i][mode] = -1; + } - obfree (first_obj); + for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + for (j = 1; j <= MOVE_MAX_WORDS; j++) + if (reg_save_code [i][regno_save_mode[i][j]] == -1) + { + regno_save_mode[i][j] = VOIDmode; + if (j == 1) + { + call_fixed_regs[i] = 1; + SET_HARD_REG_BIT (call_fixed_reg_set, i); + } + } } /* Initialize save areas by showing that we haven't allocated any yet. */ void -init_save_areas () +init_save_areas (void) { int i, j; @@ -239,19 +272,20 @@ init_save_areas () Future work: In the fallback case we should iterate backwards across all possible - modes for the save, choosing the largest available one instead of + 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 + 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 + machine independent since they might be saving non-consecutive registers. (imagine caller-saving d0,d1,a0,a1 on the 68k) */ void -setup_save_areas () +setup_save_areas (void) { int i, j, k; + unsigned int r; HARD_REG_SET hard_regs_used; /* Allocate space in the save area for the largest multi-register @@ -263,16 +297,13 @@ setup_save_areas () 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; + unsigned int regno = reg_renumber[i]; + unsigned int endregno + = regno + hard_regno_nregs[regno][GET_MODE (regno_reg_rtx[i])]; - for (j = 0; j < nregs; j++) - { - if (call_used_regs[regno+j]) - SET_HARD_REG_BIT (hard_regs_used, regno+j); - } + for (r = regno; r < endregno; r++) + if (call_used_regs[r]) + SET_HARD_REG_BIT (hard_regs_used, r); } /* Now run through all the call-used hard-registers and allocate @@ -315,23 +346,29 @@ setup_save_areas () /* 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); - } + /* This should not depend on WORDS_BIG_ENDIAN. + The order of words in regs is the same as in memory. */ + regno_save_mem[i + k][1] + = adjust_address_nv (regno_save_mem[i][j], + regno_save_mode[i + k][1], + k * UNITS_PER_WORD); } + + /* Now loop again and set the alias set of any save areas we made to + the alias set used to represent frame objects. */ + for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + for (j = MOVE_MAX_WORDS; j > 0; j--) + if (regno_save_mem[i][j] != 0) + set_mem_alias_set (regno_save_mem[i][j], get_frame_alias_set ()); } /* Find the places where hard regs are live across calls and save them. */ + void -save_call_clobbered_regs () +save_call_clobbered_regs (void) { struct insn_chain *chain, *next; + enum machine_mode save_mode [FIRST_PSEUDO_REGISTER]; CLEAR_HARD_REG_SET (hard_regs_saved); n_regs_saved = 0; @@ -343,10 +380,9 @@ save_call_clobbered_regs () next = chain->next; - if (chain->is_caller_save_insn) - abort (); + gcc_assert (!chain->is_caller_save_insn); - if (GET_RTX_CLASS (code) == 'i') + if (INSN_P (insn)) { /* If some registers have been saved, see if INSN references any of them. We must restore them before the insn if so. */ @@ -367,24 +403,52 @@ save_call_clobbered_regs () for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) if (TEST_HARD_REG_BIT (referenced_regs, regno)) - regno += insert_restore (chain, 1, regno, MOVE_MAX_WORDS); + regno += insert_restore (chain, 1, regno, MOVE_MAX_WORDS, save_mode); } - if (code == CALL_INSN) + if (code == CALL_INSN && ! find_reg_note (insn, REG_NORETURN, NULL)) { - rtx x; - int regno, nregs; + unsigned regno; HARD_REG_SET hard_regs_to_save; + reg_set_iterator rsi; /* Use the register life information in CHAIN to compute which - regs are live before the call. */ - REG_SET_TO_HARD_REG_SET (hard_regs_to_save, chain->live_before); - compute_use_by_pseudos (&hard_regs_to_save, chain->live_before); + regs are live during the call. */ + REG_SET_TO_HARD_REG_SET (hard_regs_to_save, + &chain->live_throughout); + /* Save hard registers always in the widest mode available. */ + for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) + if (TEST_HARD_REG_BIT (hard_regs_to_save, regno)) + save_mode [regno] = regno_save_mode [regno][1]; + else + save_mode [regno] = VOIDmode; + + /* Look through all live pseudos, mark their hard registers + and choose proper mode for saving. */ + EXECUTE_IF_SET_IN_REG_SET + (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi) + { + int r = reg_renumber[regno]; + int nregs; + enum machine_mode mode; + + gcc_assert (r >= 0); + nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)]; + mode = HARD_REGNO_CALLER_SAVE_MODE + (r, nregs, PSEUDO_REGNO_MODE (regno)); + if (GET_MODE_BITSIZE (mode) + > GET_MODE_BITSIZE (save_mode[r])) + save_mode[r] = mode; + while (nregs-- > 0) + SET_HARD_REG_BIT (hard_regs_to_save, r + nregs); + } /* Record all registers set in this call insn. These don't need - to be saved. */ + to be saved. N.B. the call insn might set a subreg of a + multi-hard-reg pseudo; then the pseudo is considered live + during the call, but the subreg that is set isn't. */ CLEAR_HARD_REG_SET (this_insn_sets); - note_stores (PATTERN (insn), mark_set_regs); + note_stores (PATTERN (insn), mark_set_regs, NULL); /* Compute which hard regs must be saved before this call. */ AND_COMPL_HARD_REG_SET (hard_regs_to_save, call_fixed_reg_set); @@ -392,48 +456,9 @@ save_call_clobbered_regs () AND_COMPL_HARD_REG_SET (hard_regs_to_save, hard_regs_saved); AND_HARD_REG_SET (hard_regs_to_save, call_used_reg_set); - /* Registers used for function parameters need not be saved. */ - for (x = CALL_INSN_FUNCTION_USAGE (insn); x != 0; - x = XEXP (x, 1)) - { - rtx y; - - if (GET_CODE (XEXP (x, 0)) != USE) - continue; - y = XEXP (XEXP (x, 0), 0); - if (GET_CODE (y) != REG) - abort (); - regno = REGNO (y); - if (REGNO (y) >= FIRST_PSEUDO_REGISTER) - abort (); - nregs = HARD_REGNO_NREGS (regno, GET_MODE (y)); - while (nregs-- > 0) - CLEAR_HARD_REG_BIT (hard_regs_to_save, regno + nregs); - } - - /* Neither do registers for which we find a death note. */ - for (x = REG_NOTES (insn); x != 0; x = XEXP (x, 1)) - { - rtx y = XEXP (x, 0); - - if (REG_NOTE_KIND (x) != REG_DEAD) - continue; - if (GET_CODE (y) != REG) - abort (); - regno = REGNO (y); - - if (regno >= FIRST_PSEUDO_REGISTER) - regno = reg_renumber[regno]; - if (regno < 0) - continue; - nregs = HARD_REGNO_NREGS (regno, GET_MODE (y)); - while (nregs-- > 0) - CLEAR_HARD_REG_BIT (hard_regs_to_save, regno + nregs); - } - for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) if (TEST_HARD_REG_BIT (hard_regs_to_save, regno)) - regno += insert_save (chain, 1, regno, &hard_regs_to_save); + regno += insert_save (chain, 1, regno, &hard_regs_to_save, save_mode); /* Must recompute n_regs_saved. */ n_regs_saved = 0; @@ -453,10 +478,10 @@ save_call_clobbered_regs () if (n_regs_saved) for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) if (TEST_HARD_REG_BIT (hard_regs_saved, regno)) - regno += insert_restore (chain, GET_CODE (insn) == JUMP_INSN, - regno, MOVE_MAX_WORDS); + regno += insert_restore (chain, JUMP_P (insn), + regno, MOVE_MAX_WORDS, save_mode); } - } + } } /* Here from note_stores when an insn stores a value in a register. @@ -464,37 +489,70 @@ save_call_clobbered_regs () been assigned hard regs have had their register number changed already, so we can ignore pseudos. */ static void -mark_set_regs (reg, setter) - rtx reg; - rtx setter ATTRIBUTE_UNUSED; +mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, + void *data ATTRIBUTE_UNUSED) { - register int regno, endregno, i; + int regno, endregno, i; enum machine_mode mode = GET_MODE (reg); - int word = 0; if (GET_CODE (reg) == SUBREG) { - word = SUBREG_WORD (reg); + rtx inner = SUBREG_REG (reg); + if (!REG_P (inner) || REGNO (inner) >= FIRST_PSEUDO_REGISTER) + return; + regno = subreg_regno (reg); + } + else if (REG_P (reg) + && REGNO (reg) < FIRST_PSEUDO_REGISTER) + regno = REGNO (reg); + else + return; + + endregno = regno + hard_regno_nregs[regno][mode]; + + for (i = regno; i < endregno; i++) + SET_HARD_REG_BIT (this_insn_sets, i); +} + +/* Here from note_stores when an insn stores a value in a register. + Set the proper bit or bits in the passed regset. All pseudos that have + been assigned hard regs have had their register number changed already, + so we can ignore pseudos. */ +static void +add_stored_regs (rtx reg, rtx setter, void *data) +{ + int regno, endregno, i; + enum machine_mode mode = GET_MODE (reg); + int offset = 0; + + if (GET_CODE (setter) == CLOBBER) + return; + + if (GET_CODE (reg) == SUBREG && REG_P (SUBREG_REG (reg))) + { + offset = subreg_regno_offset (REGNO (SUBREG_REG (reg)), + GET_MODE (SUBREG_REG (reg)), + SUBREG_BYTE (reg), + GET_MODE (reg)); reg = SUBREG_REG (reg); } - if (GET_CODE (reg) != REG || REGNO (reg) >= FIRST_PSEUDO_REGISTER) + if (!REG_P (reg) || REGNO (reg) >= FIRST_PSEUDO_REGISTER) return; - regno = REGNO (reg) + word; - endregno = regno + HARD_REGNO_NREGS (regno, mode); + regno = REGNO (reg) + offset; + endregno = regno + hard_regno_nregs[regno][mode]; for (i = regno; i < endregno; i++) - SET_HARD_REG_BIT (this_insn_sets, i); + SET_REGNO_REG_SET ((regset) data, i); } /* Walk X and record all referenced registers in REFERENCED_REGS. */ static void -mark_referenced_regs (x) - rtx x; +mark_referenced_regs (rtx x) { enum rtx_code code = GET_CODE (x); - char *fmt; + const char *fmt; int i, j; if (code == SET) @@ -503,8 +561,17 @@ mark_referenced_regs (x) { x = SET_DEST (x); code = GET_CODE (x); - if (code == REG || code == PC || code == CC0 - || (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG)) + if ((code == REG && REGNO (x) < FIRST_PSEUDO_REGISTER) + || code == PC || code == CC0 + || (code == SUBREG && REG_P (SUBREG_REG (x)) + && REGNO (SUBREG_REG (x)) < FIRST_PSEUDO_REGISTER + /* If we're setting only part of a multi-word register, + we shall mark it as referenced, because the words + that are not being set should be restored. */ + && ((GET_MODE_SIZE (GET_MODE (x)) + >= GET_MODE_SIZE (GET_MODE (SUBREG_REG (x)))) + || (GET_MODE_SIZE (GET_MODE (SUBREG_REG (x))) + <= UNITS_PER_WORD)))) return; } if (code == MEM || code == SUBREG) @@ -521,7 +588,7 @@ mark_referenced_regs (x) if (hardregno >= 0) { - int nregs = HARD_REGNO_NREGS (hardregno, GET_MODE (x)); + int nregs = hard_regno_nregs[hardregno][GET_MODE (x)]; while (nregs-- > 0) SET_HARD_REG_BIT (referenced_regs, hardregno + nregs); } @@ -560,26 +627,23 @@ mark_referenced_regs (x) Return the extra number of registers saved. */ static int -insert_restore (chain, before_p, regno, maxrestore) - struct insn_chain *chain; - int before_p; - int regno; - int maxrestore; +insert_restore (struct insn_chain *chain, int before_p, int regno, + int maxrestore, enum machine_mode *save_mode) { - int i; + int i, k; rtx pat = NULL_RTX; - enum insn_code code = CODE_FOR_nothing; - int numregs = 0; - - /* 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. */ + int code; + unsigned int numregs = 0; + struct insn_chain *new; + rtx mem; - if (regno_save_mem[regno][1] == 0) - abort (); + /* 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 here instead. This will remove + one step in debugging such problems. */ + gcc_assert (regno_save_mem[regno][1]); /* Get the pattern to emit and update our status. @@ -587,7 +651,7 @@ insert_restore (chain, before_p, regno, maxrestore) backwards to the single register case. */ for (i = maxrestore; i > 0; i--) { - int j, k; + int j; int ok = 1; if (regno_save_mem[regno][i] == 0) @@ -599,63 +663,68 @@ insert_restore (chain, before_p, regno, maxrestore) ok = 0; break; } - /* Must do this one restore at a time */ + /* 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_saved, regno + k); - n_regs_saved--; - } - numregs = i; break; } - insert_one_insn (chain, before_p, code, pat); + mem = regno_save_mem [regno][numregs]; + if (save_mode [regno] != VOIDmode + && save_mode [regno] != GET_MODE (mem) + && numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]]) + mem = adjust_address (mem, save_mode[regno], 0); + else + mem = copy_rtx (mem); + pat = gen_rtx_SET (VOIDmode, + gen_rtx_REG (GET_MODE (mem), + regno), mem); + code = reg_restore_code[regno][GET_MODE (mem)]; + new = insert_one_insn (chain, before_p, code, pat); + + /* Clear status for all registers we restored. */ + for (k = 0; k < i; k++) + { + CLEAR_HARD_REG_BIT (hard_regs_saved, regno + k); + SET_REGNO_REG_SET (&new->dead_or_set, regno + k); + n_regs_saved--; + } - /* Tell our callers how many extra registers we saved/restored */ + /* Tell our callers how many extra registers we saved/restored. */ return numregs - 1; } /* Like insert_restore above, but save registers instead. */ + static int -insert_save (chain, before_p, regno, to_save) - struct insn_chain *chain; - int before_p; - int regno; - HARD_REG_SET *to_save; +insert_save (struct insn_chain *chain, int before_p, int regno, + HARD_REG_SET (*to_save), enum machine_mode *save_mode) { int i; + unsigned int k; rtx pat = NULL_RTX; - enum insn_code code = CODE_FOR_nothing; - int numregs = 0; - - /* 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. */ + int code; + unsigned int numregs = 0; + struct insn_chain *new; + rtx mem; - if (regno_save_mem[regno][1] == 0) - abort (); + /* 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 here. This will remove one + step in debugging such problems. */ + gcc_assert (regno_save_mem[regno][1]); /* Get the pattern to emit and update our status. - See if we can save several registers with a single instruction. + See if we can save several registers with a single instruction. Work backwards to the single register case. */ for (i = MOVE_MAX_WORDS; i > 0; i--) { - int j, k; + int j; int ok = 1; if (regno_save_mem[regno][i] == 0) continue; @@ -666,43 +735,46 @@ insert_save (chain, before_p, regno, to_save) ok = 0; break; } - /* Must do this one save at a time */ + /* 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); - n_regs_saved++; - } - numregs = i; break; } - insert_one_insn (chain, before_p, code, pat); + mem = regno_save_mem [regno][numregs]; + if (save_mode [regno] != VOIDmode + && save_mode [regno] != GET_MODE (mem) + && numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]]) + mem = adjust_address (mem, save_mode[regno], 0); + else + mem = copy_rtx (mem); + pat = gen_rtx_SET (VOIDmode, mem, + gen_rtx_REG (GET_MODE (mem), + regno)); + code = reg_save_code[regno][GET_MODE (mem)]; + new = insert_one_insn (chain, before_p, code, pat); + + /* Set hard_regs_saved and dead_or_set for all the registers we saved. */ + for (k = 0; k < numregs; k++) + { + SET_HARD_REG_BIT (hard_regs_saved, regno + k); + SET_REGNO_REG_SET (&new->dead_or_set, regno + k); + n_regs_saved++; + } - /* Tell our callers how many extra registers we saved/restored */ + /* Tell our callers how many extra registers we saved/restored. */ return numregs - 1; } /* Emit a new caller-save insn and set the code. */ -static void -insert_one_insn (chain, before_p, code, pat) - struct insn_chain *chain; - int before_p; - enum insn_code code; - rtx pat; +static struct insn_chain * +insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx pat) { rtx insn = chain->insn; struct insn_chain *new; - + #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 @@ -710,7 +782,7 @@ insert_one_insn (chain, before_p, code, pat) 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) + if ((NONJUMP_INSN_P (insn) || JUMP_P (insn)) && before_p && reg_referenced_p (cc0_rtx, PATTERN (insn))) chain = chain->prev, insn = chain->insn; @@ -719,6 +791,8 @@ insert_one_insn (chain, before_p, code, pat) new = new_insn_chain (); if (before_p) { + rtx link; + new->prev = chain->prev; if (new->prev != 0) new->prev->next = new; @@ -730,10 +804,29 @@ insert_one_insn (chain, before_p, code, pat) new->insn = emit_insn_before (pat, insn); /* ??? It would be nice if we could exclude the already / still saved registers from the live sets. */ - COPY_REG_SET (new->live_before, chain->live_before); - COPY_REG_SET (new->live_after, chain->live_before); - if (chain->insn == BLOCK_HEAD (chain->block)) - BLOCK_HEAD (chain->block) = new->insn; + COPY_REG_SET (&new->live_throughout, &chain->live_throughout); + /* Registers that die in CHAIN->INSN still live in the new insn. */ + for (link = REG_NOTES (chain->insn); link; link = XEXP (link, 1)) + { + if (REG_NOTE_KIND (link) == REG_DEAD) + { + rtx reg = XEXP (link, 0); + int regno, i; + + gcc_assert (REG_P (reg)); + regno = REGNO (reg); + if (regno >= FIRST_PSEUDO_REGISTER) + regno = reg_renumber[regno]; + if (regno < 0) + continue; + for (i = hard_regno_nregs[regno][GET_MODE (reg)] - 1; + i >= 0; i--) + SET_REGNO_REG_SET (&new->live_throughout, regno + i); + } + } + CLEAR_REG_SET (&new->dead_or_set); + if (chain->insn == BB_HEAD (BASIC_BLOCK (chain->block))) + BB_HEAD (BASIC_BLOCK (chain->block)) = new->insn; } else { @@ -745,13 +838,19 @@ insert_one_insn (chain, before_p, code, pat) new->insn = emit_insn_after (pat, insn); /* ??? It would be nice if we could exclude the already / still saved registers from the live sets, and observe REG_UNUSED notes. */ - COPY_REG_SET (new->live_before, chain->live_after); - COPY_REG_SET (new->live_after, chain->live_after); - if (chain->insn == BLOCK_END (chain->block)) - BLOCK_END (chain->block) = new->insn; + COPY_REG_SET (&new->live_throughout, &chain->live_throughout); + /* Registers that are set in CHAIN->INSN live in the new insn. + (Unless there is a REG_UNUSED note for them, but we don't + look for them here.) */ + note_stores (PATTERN (chain->insn), add_stored_regs, + &new->live_throughout); + CLEAR_REG_SET (&new->dead_or_set); + if (chain->insn == BB_END (BASIC_BLOCK (chain->block))) + BB_END (BASIC_BLOCK (chain->block)) = new->insn; } new->block = chain->block; new->is_caller_save_insn = 1; INSN_CODE (new->insn) = code; + return new; }