X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fcaller-save.c;h=e610329fba92942e09f81e6fc275c9e15e9de1a6;hb=d3832055fda2ca4c70c534b5638eb8f018ea3225;hp=028705b43898eeaa478ec3cc2ad0ee6efe1ecc96;hpb=6f5b55f8df605d1bc15f2f0266ecb3e5957297de;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/caller-save.c b/gcc/caller-save.c index 028705b4389..e610329fba9 100644 --- a/gcc/caller-save.c +++ b/gcc/caller-save.c @@ -1,12 +1,13 @@ /* Save and restore call-clobbered registers which are live across a call. - Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, - 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. + Copyright (C) 1989, 1992, 1994, 1995, 1997, 1998, 1999, 2000, + 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 + 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 2, or (at your option) any later +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 @@ -15,18 +16,17 @@ 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 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 COPYING3. If not see +. */ #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" @@ -35,6 +35,14 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "expr.h" #include "toplev.h" #include "tm_p.h" +#include "addresses.h" +#include "output.h" +#include "df.h" +#include "ggc.h" + +/* Call used hard registers which can not be saved because there is no + insn for this. */ +HARD_REG_SET no_caller_save_reg_set; #ifndef MAX_MOVE_MAX #define MAX_MOVE_MAX MOVE_MAX @@ -60,6 +68,12 @@ static enum machine_mode static rtx regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1]; +/* The number of elements in the subsequent array. */ +static int save_slots_num; + +/* Allocated slots so far. */ +static rtx save_slots[FIRST_PSEUDO_REGISTER]; + /* 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 @@ -67,9 +81,9 @@ static rtx be recognized. */ static int - reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; + cached_reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; static int - reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; + cached_reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MACHINE_MODE]; /* Set of hard regs currently residing in save area (during insn scan). */ @@ -83,12 +97,18 @@ static int n_regs_saved; insn. */ static HARD_REG_SET referenced_regs; -/* Computed in mark_set_regs, holds all registers set by the current - instruction. */ -static HARD_REG_SET this_insn_sets; +static int reg_save_code (int, enum machine_mode); +static int reg_restore_code (int, enum machine_mode); -static void mark_set_regs (rtx, rtx, void *); +struct saved_hard_reg; +static void initiate_saved_hard_regs (void); +static struct saved_hard_reg *new_saved_hard_reg (int, int); +static void finish_saved_hard_regs (void); +static int saved_hard_reg_compare_func (const void *, const void *); + +static void mark_set_regs (rtx, const_rtx, void *); +static void add_stored_regs (rtx, const_rtx, void *); static void mark_referenced_regs (rtx); static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *, enum machine_mode *); @@ -96,12 +116,80 @@ 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 *); +static void add_stored_regs (rtx, const_rtx, void *); + + + +static GTY(()) rtx savepat; +static GTY(()) rtx restpat; +static GTY(()) rtx test_reg; +static GTY(()) rtx test_mem; +static GTY(()) rtx saveinsn; +static GTY(()) rtx restinsn; + +/* Return the INSN_CODE used to save register REG in mode MODE. */ +static int +reg_save_code (int reg, enum machine_mode mode) +{ + bool ok; + if (cached_reg_save_code[reg][mode]) + return cached_reg_save_code[reg][mode]; + if (!HARD_REGNO_MODE_OK (reg, mode)) + { + cached_reg_save_code[reg][mode] = -1; + cached_reg_restore_code[reg][mode] = -1; + return -1; + } + + /* Update the register number and modes of the register + and memory operand. */ + SET_REGNO (test_reg, reg); + 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; + + cached_reg_save_code[reg][mode] = recog_memoized (saveinsn); + cached_reg_restore_code[reg][mode] = recog_memoized (restinsn); + + /* Now extract both insns and see if we can meet their + constraints. */ + ok = (cached_reg_save_code[reg][mode] != -1 + && cached_reg_restore_code[reg][mode] != -1); + if (ok) + { + extract_insn (saveinsn); + ok = constrain_operands (1); + extract_insn (restinsn); + ok &= constrain_operands (1); + } + + if (! ok) + { + cached_reg_save_code[reg][mode] = -1; + cached_reg_restore_code[reg][mode] = -1; + } + gcc_assert (cached_reg_save_code[reg][mode]); + return cached_reg_save_code[reg][mode]; +} + +/* Return the INSN_CODE used to restore register REG in mode MODE. */ +static int +reg_restore_code (int reg, enum machine_mode mode) +{ + if (cached_reg_restore_code[reg][mode]) + return cached_reg_restore_code[reg][mode]; + /* Populate our cache. */ + reg_save_code (reg, mode); + return cached_reg_restore_code[reg][mode]; +} /* 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. + reginfo.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 @@ -115,11 +203,8 @@ init_caller_save (void) int offset; rtx address; int i, j; - enum machine_mode mode; - rtx savepat, restpat; - rtx test_reg, test_mem; - rtx saveinsn, restinsn; + CLEAR_HARD_REG_SET (no_caller_save_reg_set); /* 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. */ @@ -157,11 +242,10 @@ init_caller_save (void) for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) if (TEST_HARD_REG_BIT (reg_class_contents - [(int) MODE_BASE_REG_CLASS (regno_save_mode [i][1])], i)) + [(int) base_reg_class (regno_save_mode[i][1], PLUS, CONST_INT)], i)) break; - if (i == FIRST_PSEUDO_REGISTER) - abort (); + gcc_assert (i < FIRST_PSEUDO_REGISTER); addr_reg = gen_rtx_REG (Pmode, i); @@ -193,65 +277,26 @@ init_caller_save (void) savepat = gen_rtx_SET (VOIDmode, test_mem, test_reg); restpat = gen_rtx_SET (VOIDmode, test_reg, test_mem); - 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 (mode = 0 ; mode < MAX_MACHINE_MODE; mode++) - if (HARD_REGNO_MODE_OK (i, mode)) - { - int ok; - - /* 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][mode] != -1 - && reg_restore_code[i][mode] != -1); - if (ok) - { - extract_insn (saveinsn); - ok = constrain_operands (1); - extract_insn (restinsn); - ok &= constrain_operands (1); - } - - if (! ok) - { - reg_save_code[i][mode] = -1; - reg_restore_code[i][mode] = -1; - } - } - else - { - reg_save_code[i][mode] = -1; - reg_restore_code[i][mode] = -1; - } + saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, savepat, -1, 0); + restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, 0, 0, restpat, -1, 0); 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) + 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); + if (call_used_regs[i]) + SET_HARD_REG_BIT (no_caller_save_reg_set, i); } } } + + /* Initialize save areas by showing that we haven't allocated any yet. */ void @@ -262,6 +307,100 @@ init_save_areas (void) for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) for (j = 1; j <= MOVE_MAX_WORDS; j++) regno_save_mem[i][j] = 0; + save_slots_num = 0; + +} + +/* The structure represents a hard register which should be saved + through the call. It is used when the integrated register + allocator (IRA) is used and sharing save slots is on. */ +struct saved_hard_reg +{ + /* Order number starting with 0. */ + int num; + /* The hard regno. */ + int hard_regno; + /* Execution frequency of all calls through which given hard + register should be saved. */ + int call_freq; + /* Stack slot reserved to save the hard register through calls. */ + rtx slot; + /* True if it is first hard register in the chain of hard registers + sharing the same stack slot. */ + int first_p; + /* Order number of the next hard register structure with the same + slot in the chain. -1 represents end of the chain. */ + int next; +}; + +/* Map: hard register number to the corresponding structure. */ +static struct saved_hard_reg *hard_reg_map[FIRST_PSEUDO_REGISTER]; + +/* The number of all structures representing hard registers should be + saved, in order words, the number of used elements in the following + array. */ +static int saved_regs_num; + +/* Pointers to all the structures. Index is the order number of the + corresponding structure. */ +static struct saved_hard_reg *all_saved_regs[FIRST_PSEUDO_REGISTER]; + +/* First called function for work with saved hard registers. */ +static void +initiate_saved_hard_regs (void) +{ + int i; + + saved_regs_num = 0; + for (i = 0; i < FIRST_PSEUDO_REGISTER; i++) + hard_reg_map[i] = NULL; +} + +/* Allocate and return new saved hard register with given REGNO and + CALL_FREQ. */ +static struct saved_hard_reg * +new_saved_hard_reg (int regno, int call_freq) +{ + struct saved_hard_reg *saved_reg; + + saved_reg + = (struct saved_hard_reg *) xmalloc (sizeof (struct saved_hard_reg)); + hard_reg_map[regno] = all_saved_regs[saved_regs_num] = saved_reg; + saved_reg->num = saved_regs_num++; + saved_reg->hard_regno = regno; + saved_reg->call_freq = call_freq; + saved_reg->first_p = FALSE; + saved_reg->next = -1; + return saved_reg; +} + +/* Free memory allocated for the saved hard registers. */ +static void +finish_saved_hard_regs (void) +{ + int i; + + for (i = 0; i < saved_regs_num; i++) + free (all_saved_regs[i]); +} + +/* The function is used to sort the saved hard register structures + according their frequency. */ +static int +saved_hard_reg_compare_func (const void *v1p, const void *v2p) +{ + const struct saved_hard_reg *p1 = *(struct saved_hard_reg * const *) v1p; + const struct saved_hard_reg *p2 = *(struct saved_hard_reg * const *) v2p; + + if (flag_omit_frame_pointer) + { + if (p1->call_freq - p2->call_freq != 0) + return p1->call_freq - p2->call_freq; + } + else if (p2->call_freq - p1->call_freq != 0) + return p2->call_freq - p1->call_freq; + + return p1->num - p2->num; } /* Allocate save areas for any hard registers that might need saving. @@ -270,6 +409,10 @@ init_save_areas (void) overestimate slightly (especially if some of these registers are later used as spill registers), but it should not be significant. + For IRA we use priority coloring to decrease stack slots needed for + saving hard registers through calls. We build conflicts for them + to do coloring. + Future work: In the fallback case we should iterate backwards across all possible @@ -300,60 +443,298 @@ setup_save_areas (void) { unsigned int regno = reg_renumber[i]; unsigned int endregno - = regno + hard_regno_nregs[regno][GET_MODE (regno_reg_rtx[i])]; - + = end_hard_regno (GET_MODE (regno_reg_rtx[i]), regno); 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 - 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_WORDS; j > 0; j--) - { - int do_save = 1; - - /* 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. */ - for (k = 0; k < j; k++) - if (regno_save_mem[i + k][1]) + if (optimize && flag_ira_share_save_slots) + { + rtx insn, slot; + struct insn_chain *chain, *next; + char *saved_reg_conflicts; + unsigned int regno; + int next_k, freq; + struct saved_hard_reg *saved_reg, *saved_reg2, *saved_reg3; + int call_saved_regs_num; + struct saved_hard_reg *call_saved_regs[FIRST_PSEUDO_REGISTER]; + HARD_REG_SET hard_regs_to_save, used_regs, this_insn_sets; + reg_set_iterator rsi; + int best_slot_num; + int prev_save_slots_num; + rtx prev_save_slots[FIRST_PSEUDO_REGISTER]; + + initiate_saved_hard_regs (); + /* Create hard reg saved regs. */ + for (chain = reload_insn_chain; chain != 0; chain = next) + { + insn = chain->insn; + next = chain->next; + if (!CALL_P (insn) + || find_reg_note (insn, REG_NORETURN, NULL)) + continue; + freq = REG_FREQ_FROM_BB (BLOCK_FOR_INSN (insn)); + REG_SET_TO_HARD_REG_SET (hard_regs_to_save, + &chain->live_throughout); + COPY_HARD_REG_SET (used_regs, call_used_reg_set); + + /* Record all registers set in this call insn. These don't + need 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, &this_insn_sets); + /* Sibcalls are considered to set the return value. */ + if (SIBLING_CALL_P (insn) && crtl->return_rtx) + mark_set_regs (crtl->return_rtx, NULL_RTX, &this_insn_sets); + + AND_COMPL_HARD_REG_SET (used_regs, call_fixed_reg_set); + AND_COMPL_HARD_REG_SET (used_regs, this_insn_sets); + AND_HARD_REG_SET (hard_regs_to_save, used_regs); + for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) + if (TEST_HARD_REG_BIT (hard_regs_to_save, regno)) + { + if (hard_reg_map[regno] != NULL) + hard_reg_map[regno]->call_freq += freq; + else + saved_reg = new_saved_hard_reg (regno, freq); + } + /* Look through all live pseudos, mark their hard registers. */ + EXECUTE_IF_SET_IN_REG_SET + (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi) { - do_save = 0; - break; + int r = reg_renumber[regno]; + int bound; + + if (r < 0) + continue; + + bound = r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)]; + for (; r < bound; r++) + if (TEST_HARD_REG_BIT (used_regs, r)) + { + if (hard_reg_map[r] != NULL) + hard_reg_map[r]->call_freq += freq; + else + saved_reg = new_saved_hard_reg (r, freq); + SET_HARD_REG_BIT (hard_regs_to_save, r); + } } - if (! do_save) - continue; + } + /* Find saved hard register conflicts. */ + saved_reg_conflicts = (char *) xmalloc (saved_regs_num * saved_regs_num); + memset (saved_reg_conflicts, 0, saved_regs_num * saved_regs_num); + for (chain = reload_insn_chain; chain != 0; chain = next) + { + call_saved_regs_num = 0; + insn = chain->insn; + next = chain->next; + if (!CALL_P (insn) + || find_reg_note (insn, REG_NORETURN, NULL)) + continue; + REG_SET_TO_HARD_REG_SET (hard_regs_to_save, + &chain->live_throughout); + COPY_HARD_REG_SET (used_regs, call_used_reg_set); + + /* Record all registers set in this call insn. These don't + need 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, &this_insn_sets); + /* Sibcalls are considered to set the return value, + compare flow.c:propagate_one_insn. */ + if (SIBLING_CALL_P (insn) && crtl->return_rtx) + mark_set_regs (crtl->return_rtx, NULL_RTX, &this_insn_sets); + + AND_COMPL_HARD_REG_SET (used_regs, call_fixed_reg_set); + AND_COMPL_HARD_REG_SET (used_regs, this_insn_sets); + AND_HARD_REG_SET (hard_regs_to_save, used_regs); + for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) + if (TEST_HARD_REG_BIT (hard_regs_to_save, regno)) + { + gcc_assert (hard_reg_map[regno] != NULL); + call_saved_regs[call_saved_regs_num++] = hard_reg_map[regno]; + } + /* Look through all live pseudos, mark their hard registers. */ + EXECUTE_IF_SET_IN_REG_SET + (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi) + { + int r = reg_renumber[regno]; + int bound; + + if (r < 0) + continue; - for (k = 0; k < j; k++) - if (! TEST_HARD_REG_BIT (hard_regs_used, i + k)) + bound = r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)]; + for (; r < bound; r++) + if (TEST_HARD_REG_BIT (used_regs, r)) + call_saved_regs[call_saved_regs_num++] = hard_reg_map[r]; + } + for (i = 0; i < call_saved_regs_num; i++) { - do_save = 0; - break; + saved_reg = call_saved_regs[i]; + for (j = 0; j < call_saved_regs_num; j++) + if (i != j) + { + saved_reg2 = call_saved_regs[j]; + saved_reg_conflicts[saved_reg->num * saved_regs_num + + saved_reg2->num] + = saved_reg_conflicts[saved_reg2->num * saved_regs_num + + saved_reg->num] + = TRUE; + } } - if (! do_save) - continue; - - /* We have found an acceptable mode to store in. */ - 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. */ - regno_save_mem[i + k][1] - = adjust_address_nv (regno_save_mem[i][j], - regno_save_mode[i + k][1], - k * UNITS_PER_WORD); - } + } + /* Sort saved hard regs. */ + qsort (all_saved_regs, saved_regs_num, sizeof (struct saved_hard_reg *), + saved_hard_reg_compare_func); + /* Initiate slots available from the previous reload + iteration. */ + prev_save_slots_num = save_slots_num; + memcpy (prev_save_slots, save_slots, save_slots_num * sizeof (rtx)); + save_slots_num = 0; + /* Allocate stack slots for the saved hard registers. */ + for (i = 0; i < saved_regs_num; i++) + { + saved_reg = all_saved_regs[i]; + regno = saved_reg->hard_regno; + for (j = 0; j < i; j++) + { + saved_reg2 = all_saved_regs[j]; + if (! saved_reg2->first_p) + continue; + slot = saved_reg2->slot; + for (k = j; k >= 0; k = next_k) + { + saved_reg3 = all_saved_regs[k]; + next_k = saved_reg3->next; + if (saved_reg_conflicts[saved_reg->num * saved_regs_num + + saved_reg3->num]) + break; + } + if (k < 0 + && (GET_MODE_SIZE (regno_save_mode[regno][1]) + <= GET_MODE_SIZE (regno_save_mode + [saved_reg2->hard_regno][1]))) + { + saved_reg->slot + = adjust_address_nv + (slot, regno_save_mode[saved_reg->hard_regno][1], 0); + regno_save_mem[regno][1] = saved_reg->slot; + saved_reg->next = saved_reg2->next; + saved_reg2->next = i; + if (dump_file != NULL) + fprintf (dump_file, "%d uses slot of %d\n", + regno, saved_reg2->hard_regno); + break; + } + } + if (j == i) + { + saved_reg->first_p = TRUE; + for (best_slot_num = -1, j = 0; j < prev_save_slots_num; j++) + { + slot = prev_save_slots[j]; + if (slot == NULL_RTX) + continue; + if (GET_MODE_SIZE (regno_save_mode[regno][1]) + <= GET_MODE_SIZE (GET_MODE (slot)) + && best_slot_num < 0) + best_slot_num = j; + if (GET_MODE (slot) == regno_save_mode[regno][1]) + break; + } + if (best_slot_num >= 0) + { + saved_reg->slot = prev_save_slots[best_slot_num]; + saved_reg->slot + = adjust_address_nv + (saved_reg->slot, + regno_save_mode[saved_reg->hard_regno][1], 0); + if (dump_file != NULL) + fprintf (dump_file, + "%d uses a slot from prev iteration\n", regno); + prev_save_slots[best_slot_num] = NULL_RTX; + if (best_slot_num + 1 == prev_save_slots_num) + prev_save_slots_num--; + } + else + { + saved_reg->slot + = assign_stack_local_1 + (regno_save_mode[regno][1], + GET_MODE_SIZE (regno_save_mode[regno][1]), 0, true); + if (dump_file != NULL) + fprintf (dump_file, "%d uses a new slot\n", regno); + } + regno_save_mem[regno][1] = saved_reg->slot; + save_slots[save_slots_num++] = saved_reg->slot; + } + } + free (saved_reg_conflicts); + finish_saved_hard_regs (); + } + else + { + /* 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_WORDS; j > 0; j--) + { + int do_save = 1; + + /* 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. */ + 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++) + if (! TEST_HARD_REG_BIT (hard_regs_used, i + k)) + { + do_save = 0; + break; + } + if (! do_save) + continue; + + /* We have found an acceptable mode to store in. Since + hard register is always saved in the widest mode + available, the mode may be wider than necessary, it is + OK to reduce the alignment of spill space. We will + verify that it is equal to or greater than required + when we restore and save the hard register in + insert_restore and insert_save. */ + regno_save_mem[i][j] + = assign_stack_local_1 (regno_save_mode[i][j], + GET_MODE_SIZE (regno_save_mode[i][j]), + 0, true); + + /* 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. */ + 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. */ @@ -362,7 +743,9 @@ setup_save_areas (void) 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 @@ -371,6 +754,10 @@ save_call_clobbered_regs (void) struct insn_chain *chain, *next; enum machine_mode save_mode [FIRST_PSEUDO_REGISTER]; + /* Computed in mark_set_regs, holds all registers set by the current + instruction. */ + HARD_REG_SET this_insn_sets; + CLEAR_HARD_REG_SET (hard_regs_saved); n_regs_saved = 0; @@ -381,10 +768,9 @@ save_call_clobbered_regs (void) 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. */ @@ -408,10 +794,13 @@ save_call_clobbered_regs (void) regno += insert_restore (chain, 1, regno, MOVE_MAX_WORDS, save_mode); } - if (code == CALL_INSN && ! find_reg_note (insn, REG_NORETURN, NULL)) + if (code == CALL_INSN + && ! SIBLING_CALL_P (insn) + && ! find_reg_note (insn, REG_NORETURN, NULL)) { - int regno; + 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 during the call. */ @@ -427,34 +816,30 @@ save_call_clobbered_regs (void) /* 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, - { - int r = reg_renumber[regno]; - int nregs; - - if (r >= 0) - { - enum machine_mode mode; - - 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); - } - else - abort (); - }); + (&chain->live_throughout, FIRST_PSEUDO_REGISTER, regno, rsi) + { + int r = reg_renumber[regno]; + int nregs; + enum machine_mode mode; + + if (r < 0) + continue; + 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. 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, NULL); + note_stores (PATTERN (insn), mark_set_regs, &this_insn_sets); /* Compute which hard regs must be saved before this call. */ AND_COMPL_HARD_REG_SET (hard_regs_to_save, call_fixed_reg_set); @@ -474,7 +859,7 @@ save_call_clobbered_regs (void) } } - if (chain->next == 0 || chain->next->block > chain->block) + if (chain->next == 0 || chain->next->block != chain->block) { int regno; /* At the end of the basic block, we must restore any registers that @@ -484,41 +869,42 @@ save_call_clobbered_regs (void) 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 += 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. +/* Here from note_stores, or directly from save_call_clobbered_regs, when + an insn stores a value in a register. Set the proper bit or bits in this_insn_sets. All pseudos that have been assigned hard regs have had their register number changed already, so we can ignore pseudos. */ static void -mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, - void *data ATTRIBUTE_UNUSED) +mark_set_regs (rtx reg, const_rtx setter ATTRIBUTE_UNUSED, void *data) { int regno, endregno, i; - enum machine_mode mode = GET_MODE (reg); + HARD_REG_SET *this_insn_sets = (HARD_REG_SET *) data; if (GET_CODE (reg) == SUBREG) { rtx inner = SUBREG_REG (reg); - if (GET_CODE (inner) != REG || REGNO (inner) >= FIRST_PSEUDO_REGISTER) + if (!REG_P (inner) || REGNO (inner) >= FIRST_PSEUDO_REGISTER) return; - - regno = subreg_hard_regno (reg, 1); + regno = subreg_regno (reg); + endregno = regno + subreg_nregs (reg); } - else if (GET_CODE (reg) == REG + else if (REG_P (reg) && REGNO (reg) < FIRST_PSEUDO_REGISTER) - regno = REGNO (reg); + { + regno = REGNO (reg); + endregno = END_HARD_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); + SET_HARD_REG_BIT (*this_insn_sets, i); } /* Here from note_stores when an insn stores a value in a register. @@ -526,7 +912,7 @@ mark_set_regs (rtx reg, rtx setter ATTRIBUTE_UNUSED, 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) +add_stored_regs (rtx reg, const_rtx setter, void *data) { int regno, endregno, i; enum machine_mode mode = GET_MODE (reg); @@ -535,20 +921,25 @@ add_stored_regs (rtx reg, rtx setter, void *data) if (GET_CODE (setter) == CLOBBER) return; - if (GET_CODE (reg) == SUBREG && GET_CODE (SUBREG_REG (reg)) == REG) + if (GET_CODE (reg) == SUBREG + && REG_P (SUBREG_REG (reg)) + && REGNO (SUBREG_REG (reg)) < FIRST_PSEUDO_REGISTER) { offset = subreg_regno_offset (REGNO (SUBREG_REG (reg)), GET_MODE (SUBREG_REG (reg)), SUBREG_BYTE (reg), GET_MODE (reg)); - reg = SUBREG_REG (reg); + regno = REGNO (SUBREG_REG (reg)) + offset; + endregno = regno + subreg_nregs (reg); } + else + { + if (!REG_P (reg) || REGNO (reg) >= FIRST_PSEUDO_REGISTER) + return; - if (GET_CODE (reg) != REG || REGNO (reg) >= FIRST_PSEUDO_REGISTER) - return; - - regno = REGNO (reg) + offset; - endregno = regno + hard_regno_nregs[regno][mode]; + regno = REGNO (reg) + offset; + endregno = end_hard_regno (mode, regno); + } for (i = regno; i < endregno; i++) SET_REGNO_REG_SET ((regset) data, i); @@ -570,7 +961,7 @@ mark_referenced_regs (rtx x) code = GET_CODE (x); if ((code == REG && REGNO (x) < FIRST_PSEUDO_REGISTER) || code == PC || code == CC0 - || (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG + || (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 @@ -594,11 +985,7 @@ mark_referenced_regs (rtx x) : reg_renumber[regno]); if (hardregno >= 0) - { - int nregs = hard_regno_nregs[hardregno][GET_MODE (x)]; - while (nregs-- > 0) - SET_HARD_REG_BIT (referenced_regs, hardregno + nregs); - } + add_to_hard_reg_set (&referenced_regs, GET_MODE (x), hardregno); /* If this is a pseudo that did not get a hard register, scan its memory location, since it might involve the use of another register, which might be saved. */ @@ -641,18 +1028,16 @@ insert_restore (struct insn_chain *chain, int before_p, int regno, rtx pat = NULL_RTX; int code; unsigned int numregs = 0; - struct insn_chain *new; + struct insn_chain *new_chain; rtx mem; - /* 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 (); + /* 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. @@ -683,21 +1068,30 @@ insert_restore (struct insn_chain *chain, int before_p, int regno, 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]]) + && numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]] + /* Check that insn to restore REGNO in save_mode[regno] is + correct. */ + && reg_save_code (regno, save_mode[regno]) >= 0) mem = adjust_address (mem, save_mode[regno], 0); else mem = copy_rtx (mem); + + /* Verify that the alignment of spill space is equal to or greater + than required. */ + gcc_assert (MIN (MAX_SUPPORTED_STACK_ALIGNMENT, + GET_MODE_ALIGNMENT (GET_MODE (mem))) <= MEM_ALIGN (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); + code = reg_restore_code (regno, GET_MODE (mem)); + new_chain = 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); + SET_REGNO_REG_SET (&new_chain->dead_or_set, regno + k); n_regs_saved--; } @@ -716,18 +1110,16 @@ insert_save (struct insn_chain *chain, int before_p, int regno, rtx pat = NULL_RTX; int code; unsigned int numregs = 0; - struct insn_chain *new; + struct insn_chain *new_chain; rtx mem; - /* 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 + /* 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. */ - - if (regno_save_mem[regno][1] == 0) - abort (); + gcc_assert (regno_save_mem[regno][1]); /* Get the pattern to emit and update our status. @@ -757,21 +1149,30 @@ insert_save (struct insn_chain *chain, int before_p, int regno, 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]]) + && numregs == (unsigned int) hard_regno_nregs[regno][save_mode [regno]] + /* Check that insn to save REGNO in save_mode[regno] is + correct. */ + && reg_save_code (regno, save_mode[regno]) >= 0) mem = adjust_address (mem, save_mode[regno], 0); else mem = copy_rtx (mem); + + /* Verify that the alignment of spill space is equal to or greater + than required. */ + gcc_assert (MIN (MAX_SUPPORTED_STACK_ALIGNMENT, + GET_MODE_ALIGNMENT (GET_MODE (mem))) <= MEM_ALIGN (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); + code = reg_save_code (regno, GET_MODE (mem)); + new_chain = 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); + SET_REGNO_REG_SET (&new_chain->dead_or_set, regno + k); n_regs_saved++; } @@ -779,12 +1180,45 @@ insert_save (struct insn_chain *chain, int before_p, int regno, return numregs - 1; } +/* A for_each_rtx callback used by add_used_regs. Add the hard-register + equivalent of each REG to regset DATA. */ + +static int +add_used_regs_1 (rtx *loc, void *data) +{ + int regno, i; + regset live; + rtx x; + + x = *loc; + live = (regset) data; + if (REG_P (x)) + { + regno = REGNO (x); + if (!HARD_REGISTER_NUM_P (regno)) + regno = reg_renumber[regno]; + if (regno >= 0) + for (i = hard_regno_nregs[regno][GET_MODE (x)] - 1; i >= 0; i--) + SET_REGNO_REG_SET (live, regno + i); + } + return 0; +} + +/* A note_uses callback used by insert_one_insn. Add the hard-register + equivalent of each REG to regset DATA. */ + +static void +add_used_regs (rtx *loc, void *data) +{ + for_each_rtx (loc, add_used_regs_1, data); +} + /* Emit a new caller-save insn and set the code. */ 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; + struct insn_chain *new_chain; #ifdef HAVE_cc0 /* If INSN references CC0, put our insns in front of the insn that sets @@ -793,77 +1227,68 @@ insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx 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; #endif - new = new_insn_chain (); + new_chain = new_insn_chain (); if (before_p) { rtx link; - new->prev = chain->prev; - if (new->prev != 0) - new->prev->next = new; + new_chain->prev = chain->prev; + if (new_chain->prev != 0) + new_chain->prev->next = new_chain; else - reload_insn_chain = new; + reload_insn_chain = new_chain; - chain->prev = new; - new->next = chain; - new->insn = emit_insn_before (pat, insn); + chain->prev = new_chain; + new_chain->next = chain; + new_chain->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_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; - - if (GET_CODE (reg) != REG) - abort (); - - 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); + COPY_REG_SET (&new_chain->live_throughout, &chain->live_throughout); + note_uses (&PATTERN (chain->insn), add_used_regs, + &new_chain->live_throughout); + /* If CHAIN->INSN is a call, then the registers which contain + the arguments to the function are live in the new insn. */ + if (CALL_P (chain->insn)) + for (link = CALL_INSN_FUNCTION_USAGE (chain->insn); + link != NULL_RTX; + link = XEXP (link, 1)) + note_uses (&XEXP (link, 0), add_used_regs, + &new_chain->live_throughout); + + CLEAR_REG_SET (&new_chain->dead_or_set); if (chain->insn == BB_HEAD (BASIC_BLOCK (chain->block))) - BB_HEAD (BASIC_BLOCK (chain->block)) = new->insn; + BB_HEAD (BASIC_BLOCK (chain->block)) = new_chain->insn; } else { - new->next = chain->next; - if (new->next != 0) - new->next->prev = new; - chain->next = new; - new->prev = chain; - new->insn = emit_insn_after (pat, insn); + new_chain->next = chain->next; + if (new_chain->next != 0) + new_chain->next->prev = new_chain; + chain->next = new_chain; + new_chain->prev = chain; + new_chain->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_throughout, &chain->live_throughout); + COPY_REG_SET (&new_chain->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 + (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); + &new_chain->live_throughout); + CLEAR_REG_SET (&new_chain->dead_or_set); if (chain->insn == BB_END (BASIC_BLOCK (chain->block))) - BB_END (BASIC_BLOCK (chain->block)) = new->insn; + BB_END (BASIC_BLOCK (chain->block)) = new_chain->insn; } - new->block = chain->block; - new->is_caller_save_insn = 1; + new_chain->block = chain->block; + new_chain->is_caller_save_insn = 1; - INSN_CODE (new->insn) = code; - return new; + INSN_CODE (new_chain->insn) = code; + return new_chain; } +#include "gt-caller-save.h"