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(subst_constants): Use proper mode when getting equivalent constant for paradoxical SUBREG in SET_DEST.

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(subst_constants): Use proper mode when getting equivalent constant for
paradoxical SUBREG in SET_DEST.
(mark_stores): Clean up and tighten to properly handle hard regs.

From-SVN: r3574
This commit is contained in:
Richard Kenner 1993-03-01 07:31:19 -05:00
parent 5e2a751adc
commit e2eb57b721
1 changed files with 23 additions and 4 deletions
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27
gcc/integrate.c
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@ -2411,7 +2411,8 @@ subst_constants (loc, insn, map)
&& GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest))) <= UNITS_PER_WORD
&& (GET_MODE_SIZE (GET_MODE (SUBREG_REG (dest)))
<= GET_MODE_SIZE (GET_MODE (dest)))
&& (tem = gen_lowpart_if_possible (GET_MODE (dest), src)))
&& (tem = gen_lowpart_if_possible (GET_MODE (SUBREG_REG (dest)),
src)))
src = tem, dest = SUBREG_REG (dest);
/* If storing a recognizable value save it for later recording. */
@ -2537,11 +2538,29 @@ mark_stores (dest, x)
rtx dest;
rtx x;
{
if (GET_CODE (dest) == SUBREG)
dest = SUBREG_REG (dest);
int regno = -1;
enum machine_mode mode;
/* DEST is always the innermost thing set, except in the case of
SUBREGs of hard registers. */
if (GET_CODE (dest) == REG)
global_const_equiv_map[REGNO (dest)] = 0;
regno = REGNO (dest), mode = GET_MODE (dest);
else if (GET_CODE (dest) == SUBREG && GET_CODE (SUBREG_REG (dest)) == REG)
{
regno = REGNO (SUBREG_REG (dest)) + SUBREG_WORD (dest);
mode = GET_MODE (SUBREG_REG (dest));
}
if (regno >= 0)
{
int last_reg = (regno >= FIRST_PSEUDO_REGISTER ? regno
: regno + HARD_REGNO_NREGS (regno, mode) - 1);
int i;
for (i = regno; i <= last_reg; i++)
global_const_equiv_map[i] = 0;
}
}
/* If any CONST expressions with RTX_INTEGRATED_P are present in the rtx