/* Save and restore call-clobbered registers which are live across a call.
- Copyright (C) 1989-2015 Free Software Foundation, Inc.
+ Copyright (C) 1989-2019 Free Software Foundation, Inc.
This file is part of GCC.
#include "config.h"
#include "system.h"
#include "coretypes.h"
-#include "tm.h"
+#include "backend.h"
#include "rtl.h"
-#include "regs.h"
-#include "insn-config.h"
-#include "flags.h"
-#include "hard-reg-set.h"
-#include "recog.h"
+#include "tree.h"
#include "predict.h"
-#include "vec.h"
-#include "hashtab.h"
-#include "hash-set.h"
-#include "machmode.h"
-#include "input.h"
-#include "function.h"
-#include "dominance.h"
-#include "cfg.h"
-#include "basic-block.h"
#include "df.h"
+#include "memmodel.h"
+#include "tm_p.h"
+#include "insn-config.h"
+#include "regs.h"
+#include "emit-rtl.h"
+#include "recog.h"
#include "reload.h"
-#include "symtab.h"
-#include "statistics.h"
-#include "double-int.h"
-#include "real.h"
-#include "fixed-value.h"
#include "alias.h"
-#include "wide-int.h"
-#include "inchash.h"
-#include "tree.h"
-#include "expmed.h"
-#include "dojump.h"
-#include "explow.h"
-#include "calls.h"
-#include "emit-rtl.h"
-#include "varasm.h"
-#include "stmt.h"
-#include "expr.h"
-#include "diagnostic-core.h"
-#include "tm_p.h"
#include "addresses.h"
-#include "ggc.h"
#include "dumpfile.h"
#include "rtl-iter.h"
+#include "target.h"
+#include "function-abi.h"
#define MOVE_MAX_WORDS (MOVE_MAX / UNITS_PER_WORD)
static void mark_referenced_regs (rtx *, refmarker_fn *mark, void *mark_arg);
static refmarker_fn mark_reg_as_referenced;
static refmarker_fn replace_reg_with_saved_mem;
-static int insert_save (struct insn_chain *, int, int, HARD_REG_SET *,
+static int insert_save (class insn_chain *, int, HARD_REG_SET *,
machine_mode *);
-static int insert_restore (struct insn_chain *, int, int, int,
+static int insert_restore (class insn_chain *, int, int, int,
machine_mode *);
-static struct insn_chain *insert_one_insn (struct insn_chain *, int, int,
+static class insn_chain *insert_one_insn (class insn_chain *, int, int,
rtx);
static void add_stored_regs (rtx, const_rtx, void *);
bool ok;
if (cached_reg_save_code[reg][mode])
return cached_reg_save_code[reg][mode];
- if (!HARD_REGNO_MODE_OK (reg, mode))
+ if (!targetm.hard_regno_mode_ok (reg, mode))
{
- /* Depending on how HARD_REGNO_MODE_OK is defined, range propagation
- might deduce here that reg >= FIRST_PSEUDO_REGISTER. So the assert
- below silences a warning. */
+ /* Depending on how targetm.hard_regno_mode_ok is defined, range
+ propagation might deduce here that reg >= FIRST_PSEUDO_REGISTER.
+ So the assert below silences a warning. */
gcc_assert (reg < FIRST_PSEUDO_REGISTER);
cached_reg_save_code[reg][mode] = -1;
cached_reg_restore_code[reg][mode] = -1;
/* Update the register number and modes of the register
and memory operand. */
- SET_REGNO_RAW (test_reg, reg);
- PUT_MODE (test_reg, mode);
+ set_mode_and_regno (test_reg, mode, reg);
PUT_MODE (test_mem, mode);
/* Force re-recognition of the modified insns. */
caller_save_initialized_p = true;
- 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 (call_used_regs[i]
- && !TEST_HARD_REG_BIT (call_fixed_reg_set, i))
- {
- for (j = 1; j <= MOVE_MAX_WORDS; j++)
- {
- regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j,
- VOIDmode);
- if (regno_save_mode[i][j] == VOIDmode && j == 1)
- {
- SET_HARD_REG_BIT (call_fixed_reg_set, i);
- }
- }
- }
- else
- regno_save_mode[i][1] = VOIDmode;
- }
+ for (j = 1; j <= MOVE_MAX_WORDS; j++)
+ {
+ regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j, VOIDmode);
+ if (regno_save_mode[i][j] == VOIDmode && j == 1)
+ CLEAR_HARD_REG_BIT (savable_regs, i);
+ }
/* The following code tries to approximate the conditions under which
we can easily save and restore a register without scratch registers or
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);
+ test_reg = gen_rtx_REG (word_mode, LAST_VIRTUAL_REGISTER + 1);
+ test_mem = gen_rtx_MEM (word_mode, address);
+ savepat = gen_rtx_SET (test_mem, test_reg);
+ restpat = gen_rtx_SET (test_reg, test_mem);
saveinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, savepat, 0, -1, 0);
restinsn = gen_rtx_INSN (VOIDmode, 0, 0, 0, restpat, 0, -1, 0);
{
regno_save_mode[i][j] = VOIDmode;
if (j == 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);
- }
+ CLEAR_HARD_REG_BIT (savable_regs, i);
}
}
HARD_REG_SET hard_regs_used;
struct saved_hard_reg *saved_reg;
rtx_insn *insn;
- struct insn_chain *chain, *next;
+ class insn_chain *chain, *next;
unsigned int regno;
HARD_REG_SET hard_regs_to_save, used_regs, this_insn_sets;
reg_set_iterator rsi;
freq = REG_FREQ_FROM_BB (BLOCK_FOR_INSN (insn));
REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
&chain->live_throughout);
- get_call_reg_set_usage (insn, &used_regs, call_used_reg_set);
+ used_regs = insn_callee_abi (insn).full_reg_clobbers ();
+ /* ??? This preserves traditional behavior; it might not be needed. */
+ used_regs |= fixed_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
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);
+ note_stores (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);
+ used_regs &= ~(fixed_reg_set | this_insn_sets);
+ hard_regs_to_save &= used_regs & savable_regs;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
{
if (r < 0 || regno_reg_rtx[regno] == cheap)
continue;
- bound = r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+ bound = r + hard_regno_nregs (r, PSEUDO_REGNO_MODE (regno));
for (; r < bound; r++)
if (TEST_HARD_REG_BIT (used_regs, r))
{
REG_SET_TO_HARD_REG_SET (hard_regs_to_save,
&chain->live_throughout);
- get_call_reg_set_usage (insn, &used_regs, call_used_reg_set);
+ used_regs = insn_callee_abi (insn).full_reg_clobbers ();
+ /* ??? This preserves traditional behavior; it might not
+ be needed. */
+ used_regs |= fixed_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
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);
+ note_stores (insn, mark_set_regs, &this_insn_sets);
/* Sibcalls are considered to set the return value,
compare df-scan.c:df_get_call_refs. */
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);
+ used_regs &= ~(fixed_reg_set | this_insn_sets);
+ hard_regs_to_save &= used_regs & savable_regs;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
{
if (r < 0 || regno_reg_rtx[regno] == cheap)
continue;
- bound = r + hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+ 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];
break;
}
if (k < 0
- && (GET_MODE_SIZE (regno_save_mode[regno][1])
- <= GET_MODE_SIZE (regno_save_mode
- [saved_reg2->hard_regno][1])))
+ && known_le (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 = prev_save_slots[j];
if (slot == NULL_RTX)
continue;
- if (GET_MODE_SIZE (regno_save_mode[regno][1])
- <= GET_MODE_SIZE (GET_MODE (slot))
+ if (known_le (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])
void
save_call_clobbered_regs (void)
{
- struct insn_chain *chain, *next, *last = NULL;
+ class insn_chain *chain, *next, *last = NULL;
machine_mode save_mode [FIRST_PSEUDO_REGISTER];
/* Computed in mark_set_regs, holds all registers set by the current
if (code == JUMP_INSN)
/* Restore all registers if this is a JUMP_INSN. */
- COPY_HARD_REG_SET (referenced_regs, hard_regs_saved);
+ referenced_regs = hard_regs_saved;
else
{
CLEAR_HARD_REG_SET (referenced_regs);
mark_referenced_regs (&PATTERN (insn),
mark_reg_as_referenced, NULL);
- AND_HARD_REG_SET (referenced_regs, hard_regs_saved);
+ referenced_regs &= hard_regs_saved;
}
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
be live across the call, while the other is set
afterwards. */
CLEAR_HARD_REG_SET (this_insn_sets);
- note_stores (PATTERN (insn), mark_set_regs, &this_insn_sets);
- AND_COMPL_HARD_REG_SET (hard_regs_saved, this_insn_sets);
+ note_stores (insn, mark_set_regs, &this_insn_sets);
+ hard_regs_saved &= ~this_insn_sets;
}
if (code == CALL_INSN
if (r < 0 || regno_reg_rtx[regno] == cheap)
continue;
- nregs = hard_regno_nregs[r][PSEUDO_REGNO_MODE (regno)];
+ 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]))
+ if (partial_subreg_p (save_mode[r], mode))
save_mode[r] = mode;
while (nregs-- > 0)
SET_HARD_REG_BIT (hard_regs_to_save, r + nregs);
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);
+ note_stores (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);
- AND_COMPL_HARD_REG_SET (hard_regs_to_save, this_insn_sets);
- AND_COMPL_HARD_REG_SET (hard_regs_to_save, hard_regs_saved);
- get_call_reg_set_usage (insn, &call_def_reg_set,
- call_used_reg_set);
- AND_HARD_REG_SET (hard_regs_to_save, call_def_reg_set);
+ hard_regs_to_save &= ~(fixed_reg_set
+ | this_insn_sets
+ | hard_regs_saved);
+ hard_regs_to_save &= savable_regs;
+ call_def_reg_set = insn_callee_abi (insn).full_reg_clobbers ();
+ /* ??? This preserves traditional behavior; it might not
+ be needed. */
+ call_def_reg_set |= fixed_reg_set;
+ hard_regs_to_save &= call_def_reg_set;
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, save_mode);
+ regno += insert_save (chain, regno,
+ &hard_regs_to_save, save_mode);
/* Must recompute n_regs_saved. */
n_regs_saved = 0;
if (cheap
&& HARD_REGISTER_P (cheap)
- && TEST_HARD_REG_BIT (call_used_reg_set, REGNO (cheap)))
+ && TEST_HARD_REG_BIT (call_used_or_fixed_regs,
+ REGNO (cheap)))
{
rtx dest, newpat;
rtx pat = PATTERN (insn);
Currently we handle only single return value case. */
if (REG_P (dest))
{
- newpat = gen_rtx_SET (VOIDmode, cheap, copy_rtx (dest));
+ newpat = gen_rtx_SET (cheap, copy_rtx (dest));
chain = insert_one_insn (chain, 0, -1, newpat);
}
}
&& REGNO (reg) < FIRST_PSEUDO_REGISTER)
{
regno = REGNO (reg);
- endregno = END_HARD_REGNO (reg);
+ endregno = END_REGNO (reg);
}
else
return;
/* 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 (*loc))
- >= GET_MODE_SIZE (GET_MODE (SUBREG_REG (*loc))))
- || (GET_MODE_SIZE (GET_MODE (SUBREG_REG (*loc)))
- <= UNITS_PER_WORD))))
+ && !read_modify_subreg_p (*loc)))
return;
}
if (code == MEM || code == SUBREG)
int regno,
void *arg)
{
- unsigned int i, nregs = hard_regno_nregs [regno][mode];
+ unsigned int i, nregs = hard_regno_nregs (regno, mode);
rtx mem;
machine_mode *save_mode = (machine_mode *)arg;
{
mem = copy_rtx (regno_save_mem[regno][nregs]);
- if (nregs == (unsigned int) hard_regno_nregs[regno][save_mode[regno]])
+ if (nregs == hard_regno_nregs (regno, save_mode[regno]))
mem = adjust_address_nv (mem, save_mode[regno], 0);
if (GET_MODE (mem) != mode)
{
/* This is gen_lowpart_if_possible(), but without validating
the newly-formed address. */
- int offset = 0;
-
- if (WORDS_BIG_ENDIAN)
- offset = (MAX (GET_MODE_SIZE (GET_MODE (mem)), UNITS_PER_WORD)
- - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
- if (BYTES_BIG_ENDIAN)
- /* Adjust the address so that the address-after-the-data is
- unchanged. */
- offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
- - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (mem))));
-
+ poly_int64 offset = byte_lowpart_offset (mode, GET_MODE (mem));
mem = adjust_address_nv (mem, mode, offset);
}
}
{
machine_mode smode = save_mode[regno];
gcc_assert (smode != VOIDmode);
- if (hard_regno_nregs [regno][smode] > 1)
- smode = mode_for_size (GET_MODE_SIZE (mode) / nregs,
- GET_MODE_CLASS (mode), 0);
+ if (hard_regno_nregs (regno, smode) > 1)
+ smode = mode_for_size (exact_div (GET_MODE_BITSIZE (mode),
+ nregs),
+ GET_MODE_CLASS (mode), 0).require ();
XVECEXP (mem, 0, i) = gen_rtx_REG (smode, regno + i);
}
}
Return the extra number of registers saved. */
static int
-insert_restore (struct insn_chain *chain, int before_p, int regno,
+insert_restore (class insn_chain *chain, int before_p, int regno,
int maxrestore, machine_mode *save_mode)
{
int i, k;
rtx pat = NULL_RTX;
int code;
unsigned int numregs = 0;
- struct insn_chain *new_chain;
+ class insn_chain *new_chain;
rtx mem;
/* A common failure mode if register status is not correct in the
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 == 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)
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);
+ pat = gen_rtx_SET (gen_rtx_REG (GET_MODE (mem), regno), mem);
code = reg_restore_code (regno, GET_MODE (mem));
new_chain = insert_one_insn (chain, before_p, code, pat);
/* Like insert_restore above, but save registers instead. */
static int
-insert_save (struct insn_chain *chain, int before_p, int regno,
- HARD_REG_SET (*to_save), machine_mode *save_mode)
+insert_save (class insn_chain *chain, int regno,
+ HARD_REG_SET *to_save, machine_mode *save_mode)
{
int i;
unsigned int k;
rtx pat = NULL_RTX;
int code;
unsigned int numregs = 0;
- struct insn_chain *new_chain;
+ class insn_chain *new_chain;
rtx mem;
/* A common failure mode if register status is not correct in the
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 == 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)
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));
+ pat = gen_rtx_SET (mem, gen_rtx_REG (GET_MODE (mem), regno));
code = reg_save_code (regno, GET_MODE (mem));
- new_chain = insert_one_insn (chain, before_p, code, pat);
+ new_chain = insert_one_insn (chain, 1, code, pat);
/* Set hard_regs_saved and dead_or_set for all the registers we saved. */
for (k = 0; k < numregs; k++)
{
unsigned int regno = REGNO (x);
if (HARD_REGISTER_NUM_P (regno))
- bitmap_set_range ((regset) data, regno,
- hard_regno_nregs[regno][GET_MODE (x)]);
+ bitmap_set_range ((regset) data, regno, REG_NREGS (x));
else
gcc_checking_assert (reg_renumber[regno] < 0);
}
}
/* 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)
+static class insn_chain *
+insert_one_insn (class insn_chain *chain, int before_p, int code, rtx pat)
{
rtx_insn *insn = chain->insn;
- struct insn_chain *new_chain;
+ class insn_chain *new_chain;
-#ifdef HAVE_cc0
/* If INSN references CC0, put our insns in front of the insn that sets
CC0. This is always safe, since the only way we could be passed an
insn that references CC0 is for a restore, and doing a restore earlier
isn't a problem. We do, however, assume here that CALL_INSNs don't
reference CC0. Guard against non-INSN's like CODE_LABEL. */
- if ((NONJUMP_INSN_P (insn) || JUMP_P (insn))
+ if (HAVE_cc0 && (NONJUMP_INSN_P (insn) || JUMP_P (insn))
&& before_p
&& reg_referenced_p (cc0_rtx, PATTERN (insn)))
chain = chain->prev, insn = chain->insn;
-#endif
new_chain = new_insn_chain ();
if (before_p)
/* 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_chain->live_throughout);
+ note_stores (chain->insn, add_stored_regs, &new_chain->live_throughout);
CLEAR_REG_SET (&new_chain->dead_or_set);
if (chain->insn == BB_END (BASIC_BLOCK_FOR_FN (cfun, chain->block)))
BB_END (BASIC_BLOCK_FOR_FN (cfun, chain->block)) = new_chain->insn;