/* 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 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
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
+<http://www.gnu.org/licenses/>. */
#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 "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
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
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). */
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 *);
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 *);
+
+\f
+
+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];
+}
\f
/* Initialize for caller-save.
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. */
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);
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);
}
}
}
+
\f
+
/* Initialize save areas by showing that we haven't allocated any yet. */
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.
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
{
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 (flag_ira && 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 (GET_CODE (insn) != CALL_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 (GET_CODE (insn) != CALL_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. */
if (regno_save_mem[i][j] != 0)
set_mem_alias_set (regno_save_mem[i][j], get_frame_alias_set ());
}
+
\f
+
/* Find the places where hard regs are live across calls and save them. */
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;
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. */
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. */
/* 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);
}
}
- 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
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.
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);
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);
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
: 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. */
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.
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--;
}
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.
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++;
}
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
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. */
+ COPY_REG_SET (&new_chain->live_throughout, &chain->live_throughout);
+ /* Registers that die in CHAIN->INSN still live in the new insn.
+ Likewise for those which are autoincremented or autodecremented. */
for (link = REG_NOTES (chain->insn); link; link = XEXP (link, 1))
{
- if (REG_NOTE_KIND (link) == REG_DEAD)
+ enum reg_note kind = REG_NOTE_KIND (link);
+ if (kind == REG_DEAD || kind == REG_INC)
{
rtx reg = XEXP (link, 0);
int regno, i;
- if (GET_CODE (reg) != REG)
- abort ();
-
+ gcc_assert (REG_P (reg));
regno = REGNO (reg);
if (regno >= FIRST_PSEUDO_REGISTER)
regno = reg_renumber[regno];
continue;
for (i = hard_regno_nregs[regno][GET_MODE (reg)] - 1;
i >= 0; i--)
- SET_REGNO_REG_SET (&new->live_throughout, regno + i);
+ SET_REGNO_REG_SET (&new_chain->live_throughout, regno + i);
+ }
+ }
+
+ /* 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))
+ {
+ rtx arg = XEXP (link, 0);
+
+ if (GET_CODE (arg) == USE)
+ {
+ rtx reg = XEXP (arg, 0);
+
+ if (REG_P (reg))
+ {
+ int i, regno = REGNO (reg);
+
+ /* Registers in CALL_INSN_FUNCTION_USAGE are always
+ hard registers. */
+ gcc_assert (regno < FIRST_PSEUDO_REGISTER);
+
+ for (i = hard_regno_nregs[regno][GET_MODE (reg)] - 1;
+ i >= 0; i--)
+ SET_REGNO_REG_SET (&new_chain->live_throughout, regno + i);
+ }
+ }
}
+
}
- CLEAR_REG_SET (&new->dead_or_set);
+
+ 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"
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