#include "config.h"
#include "system.h"
#include "rtl.h"
#include "insn-config.h"
#include "flags.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "recog.h"
#include "basic-block.h"
#include "reload.h"
#include "expr.h"
#include "toplev.h"
#ifndef MAX_MOVE_MAX
#define MAX_MOVE_MAX MOVE_MAX
#endif
#ifndef MIN_UNITS_PER_WORD
#define MIN_UNITS_PER_WORD UNITS_PER_WORD
#endif
#define MOVE_MAX_WORDS (MOVE_MAX / UNITS_PER_WORD)
static enum machine_mode
regno_save_mode[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
static rtx
regno_save_mem[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
static enum insn_code
reg_save_code[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
static enum insn_code
reg_restore_code[FIRST_PSEUDO_REGISTER][MAX_MOVE_MAX / MIN_UNITS_PER_WORD + 1];
static HARD_REG_SET hard_regs_saved;
static int n_regs_saved;
static HARD_REG_SET referenced_regs;
static HARD_REG_SET this_insn_sets;
static void mark_set_regs PROTO((rtx, rtx));
static void mark_referenced_regs PROTO((rtx));
static int insert_save PROTO((struct insn_chain *, int, int,
HARD_REG_SET *));
static int insert_restore PROTO((struct insn_chain *, int, int,
int));
static void insert_one_insn PROTO((struct insn_chain *, int,
enum insn_code, rtx));
void
init_caller_save ()
{
char *first_obj = (char *) oballoc (0);
rtx addr_reg;
int offset;
rtx address;
int i, j;
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
{
if (call_used_regs[i] && ! call_fixed_regs[i])
{
for (j = 1; j <= MOVE_MAX_WORDS; j++)
{
regno_save_mode[i][j] = HARD_REGNO_CALLER_SAVE_MODE (i, j);
if (regno_save_mode[i][j] == VOIDmode && j == 1)
{
call_fixed_regs[i] = 1;
SET_HARD_REG_BIT (call_fixed_reg_set, i);
}
}
}
else
regno_save_mode[i][1] = VOIDmode;
}
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (TEST_HARD_REG_BIT (reg_class_contents[(int) BASE_REG_CLASS], i))
break;
if (i == FIRST_PSEUDO_REGISTER)
abort ();
addr_reg = gen_rtx_REG (Pmode, i);
for (offset = 1 << (HOST_BITS_PER_INT / 2); offset; offset >>= 1)
{
address = gen_rtx_PLUS (Pmode, addr_reg, GEN_INT (offset));
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
if (regno_save_mode[i][1] != VOIDmode
&& ! strict_memory_address_p (regno_save_mode[i][1], address))
break;
if (i == FIRST_PSEUDO_REGISTER)
break;
}
if (offset == 0)
address = addr_reg;
start_sequence ();
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
for (j = 1; j <= MOVE_MAX_WORDS; j++)
if (regno_save_mode[i][j] != VOIDmode)
{
rtx mem = gen_rtx_MEM (regno_save_mode[i][j], address);
rtx reg = gen_rtx_REG (regno_save_mode[i][j], i);
rtx savepat = gen_rtx_SET (VOIDmode, mem, reg);
rtx restpat = gen_rtx_SET (VOIDmode, reg, mem);
rtx saveinsn = emit_insn (savepat);
rtx restinsn = emit_insn (restpat);
int ok;
reg_save_code[i][j] = recog_memoized (saveinsn);
reg_restore_code[i][j] = recog_memoized (restinsn);
ok = (reg_save_code[i][j] != (enum insn_code)-1
&& reg_restore_code[i][j] != (enum insn_code)-1);
if (ok)
{
extract_insn (saveinsn);
ok = constrain_operands (1);
extract_insn (restinsn);
ok &= constrain_operands (1);
}
if (! ok)
{
regno_save_mode[i][j] = VOIDmode;
if (j == 1)
{
call_fixed_regs[i] = 1;
SET_HARD_REG_BIT (call_fixed_reg_set, i);
}
}
}
end_sequence ();
obfree (first_obj);
}
void
init_save_areas ()
{
int i, j;
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
for (j = 1; j <= MOVE_MAX_WORDS; j++)
regno_save_mem[i][j] = 0;
}
void
setup_save_areas ()
{
int i, j, k;
HARD_REG_SET hard_regs_used;
CLEAR_HARD_REG_SET (hard_regs_used);
for (i = FIRST_PSEUDO_REGISTER; i < max_regno; i++)
if (reg_renumber[i] >= 0 && REG_N_CALLS_CROSSED (i) > 0)
{
int regno = reg_renumber[i];
int endregno
= regno + HARD_REGNO_NREGS (regno, GET_MODE (regno_reg_rtx[i]));
int nregs = endregno - regno;
for (j = 0; j < nregs; j++)
{
if (call_used_regs[regno+j])
SET_HARD_REG_BIT (hard_regs_used, regno+j);
}
}
for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
for (j = MOVE_MAX_WORDS; j > 0; j--)
{
int do_save = 1;
if (regno_save_mode[i][j] == VOIDmode || regno_save_mem[i][1] != 0)
continue;
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;
regno_save_mem[i][j]
= assign_stack_local (regno_save_mode[i][j],
GET_MODE_SIZE (regno_save_mode[i][j]), 0);
for (k = 0; k < j; k++)
{
rtx temp = gen_rtx_MEM (regno_save_mode[i+k][1],
XEXP (regno_save_mem[i][j], 0));
regno_save_mem[i+k][1]
= adj_offsettable_operand (temp, k * UNITS_PER_WORD);
}
}
}
void
save_call_clobbered_regs ()
{
struct insn_chain *chain, *next;
CLEAR_HARD_REG_SET (hard_regs_saved);
n_regs_saved = 0;
for (chain = reload_insn_chain; chain != 0; chain = next)
{
rtx insn = chain->insn;
enum rtx_code code = GET_CODE (insn);
next = chain->next;
if (chain->is_caller_save_insn)
abort ();
if (GET_RTX_CLASS (code) == 'i')
{
if (n_regs_saved)
{
int regno;
if (code == JUMP_INSN)
COPY_HARD_REG_SET (referenced_regs, hard_regs_saved);
else
{
CLEAR_HARD_REG_SET (referenced_regs);
mark_referenced_regs (PATTERN (insn));
AND_HARD_REG_SET (referenced_regs, hard_regs_saved);
}
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (referenced_regs, regno))
regno += insert_restore (chain, 1, regno, MOVE_MAX_WORDS);
}
if (code == CALL_INSN)
{
rtx x;
int regno, nregs;
HARD_REG_SET hard_regs_to_save;
REG_SET_TO_HARD_REG_SET (hard_regs_to_save, chain->live_before);
compute_use_by_pseudos (&hard_regs_to_save, chain->live_before);
CLEAR_HARD_REG_SET (this_insn_sets);
note_stores (PATTERN (insn), mark_set_regs);
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);
AND_HARD_REG_SET (hard_regs_to_save, call_used_reg_set);
for (x = CALL_INSN_FUNCTION_USAGE (insn); x != 0;
x = XEXP (x, 1))
{
rtx y;
if (GET_CODE (XEXP (x, 0)) != USE)
continue;
y = XEXP (XEXP (x, 0), 0);
if (GET_CODE (y) != REG)
abort ();
regno = REGNO (y);
if (REGNO (y) >= FIRST_PSEUDO_REGISTER)
abort ();
nregs = HARD_REGNO_NREGS (regno, GET_MODE (y));
while (nregs-- > 0)
CLEAR_HARD_REG_BIT (hard_regs_to_save, regno + nregs);
}
for (x = REG_NOTES (insn); x != 0; x = XEXP (x, 1))
{
rtx y = XEXP (x, 0);
if (REG_NOTE_KIND (x) != REG_DEAD)
continue;
if (GET_CODE (y) != REG)
abort ();
regno = REGNO (y);
if (regno >= FIRST_PSEUDO_REGISTER)
regno = reg_renumber[regno];
if (regno < 0)
continue;
nregs = HARD_REGNO_NREGS (regno, GET_MODE (y));
while (nregs-- > 0)
CLEAR_HARD_REG_BIT (hard_regs_to_save, regno + nregs);
}
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_to_save, regno))
regno += insert_save (chain, 1, regno, &hard_regs_to_save);
n_regs_saved = 0;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
n_regs_saved++;
}
}
if (chain->next == 0 || chain->next->block > chain->block)
{
int regno;
if (n_regs_saved)
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (TEST_HARD_REG_BIT (hard_regs_saved, regno))
regno += insert_restore (chain, GET_CODE (insn) == JUMP_INSN,
regno, MOVE_MAX_WORDS);
}
}
}
static void
mark_set_regs (reg, setter)
rtx reg;
rtx setter ATTRIBUTE_UNUSED;
{
register int regno, endregno, i;
enum machine_mode mode = GET_MODE (reg);
int word = 0;
if (GET_CODE (reg) == SUBREG)
{
word = SUBREG_WORD (reg);
reg = SUBREG_REG (reg);
}
if (GET_CODE (reg) != REG || REGNO (reg) >= FIRST_PSEUDO_REGISTER)
return;
regno = REGNO (reg) + word;
endregno = regno + HARD_REGNO_NREGS (regno, mode);
for (i = regno; i < endregno; i++)
SET_HARD_REG_BIT (this_insn_sets, i);
}
static void
mark_referenced_regs (x)
rtx x;
{
enum rtx_code code = GET_CODE (x);
char *fmt;
int i, j;
if (code == SET)
mark_referenced_regs (SET_SRC (x));
if (code == SET || code == CLOBBER)
{
x = SET_DEST (x);
code = GET_CODE (x);
if (code == REG || code == PC || code == CC0
|| (code == SUBREG && GET_CODE (SUBREG_REG (x)) == REG))
return;
}
if (code == MEM || code == SUBREG)
{
x = XEXP (x, 0);
code = GET_CODE (x);
}
if (code == REG)
{
int regno = REGNO (x);
int hardregno = (regno < FIRST_PSEUDO_REGISTER ? regno
: 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);
}
else if (reg_equiv_mem[regno] != 0)
mark_referenced_regs (XEXP (reg_equiv_mem[regno], 0));
else if (reg_equiv_address[regno] != 0)
mark_referenced_regs (reg_equiv_address[regno]);
return;
}
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
{
if (fmt[i] == 'e')
mark_referenced_regs (XEXP (x, i));
else if (fmt[i] == 'E')
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
mark_referenced_regs (XVECEXP (x, i, j));
}
}
static int
insert_restore (chain, before_p, regno, maxrestore)
struct insn_chain *chain;
int before_p;
int regno;
int maxrestore;
{
int i;
rtx pat = NULL_RTX;
enum insn_code code = CODE_FOR_nothing;
int numregs = 0;
if (regno_save_mem[regno][1] == 0)
abort ();
for (i = maxrestore; i > 0; i--)
{
int j, k;
int ok = 1;
if (regno_save_mem[regno][i] == 0)
continue;
for (j = 0; j < i; j++)
if (! TEST_HARD_REG_BIT (hard_regs_saved, regno + j))
{
ok = 0;
break;
}
if (! ok)
continue;
pat = gen_rtx_SET (VOIDmode,
gen_rtx_REG (GET_MODE (regno_save_mem[regno][i]),
regno),
regno_save_mem[regno][i]);
code = reg_restore_code[regno][i];
for (k = 0; k < i; k++)
{
CLEAR_HARD_REG_BIT (hard_regs_saved, regno + k);
n_regs_saved--;
}
numregs = i;
break;
}
insert_one_insn (chain, before_p, code, pat);
return numregs - 1;
}
static int
insert_save (chain, before_p, regno, to_save)
struct insn_chain *chain;
int before_p;
int regno;
HARD_REG_SET *to_save;
{
int i;
rtx pat = NULL_RTX;
enum insn_code code = CODE_FOR_nothing;
int numregs = 0;
if (regno_save_mem[regno][1] == 0)
abort ();
for (i = MOVE_MAX_WORDS; i > 0; i--)
{
int j, k;
int ok = 1;
if (regno_save_mem[regno][i] == 0)
continue;
for (j = 0; j < i; j++)
if (! TEST_HARD_REG_BIT (*to_save, regno + j))
{
ok = 0;
break;
}
if (! ok)
continue;
pat = gen_rtx_SET (VOIDmode, regno_save_mem[regno][i],
gen_rtx_REG (GET_MODE (regno_save_mem[regno][i]),
regno));
code = reg_save_code[regno][i];
for (k = 0; k < i; k++)
{
SET_HARD_REG_BIT (hard_regs_saved, regno + k);
n_regs_saved++;
}
numregs = i;
break;
}
insert_one_insn (chain, before_p, code, pat);
return numregs - 1;
}
static void
insert_one_insn (chain, before_p, code, pat)
struct insn_chain *chain;
int before_p;
enum insn_code code;
rtx pat;
{
rtx insn = chain->insn;
struct insn_chain *new;
#ifdef HAVE_cc0
if ((GET_CODE (insn) == INSN || GET_CODE (insn) == JUMP_INSN)
&& before_p
&& reg_referenced_p (cc0_rtx, PATTERN (insn)))
chain = chain->prev, insn = chain->insn;
#endif
new = new_insn_chain ();
if (before_p)
{
new->prev = chain->prev;
if (new->prev != 0)
new->prev->next = new;
else
reload_insn_chain = new;
chain->prev = new;
new->next = chain;
new->insn = emit_insn_before (pat, insn);
COPY_REG_SET (new->live_before, chain->live_before);
COPY_REG_SET (new->live_after, chain->live_before);
if (chain->insn == BLOCK_HEAD (chain->block))
BLOCK_HEAD (chain->block) = new->insn;
}
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);
COPY_REG_SET (new->live_before, chain->live_after);
COPY_REG_SET (new->live_after, chain->live_after);
if (chain->insn == BLOCK_END (chain->block))
BLOCK_END (chain->block) = new->insn;
}
new->block = chain->block;
new->is_caller_save_insn = 1;
INSN_CODE (new->insn) = code;
}