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From-SVN: r7091
This commit is contained in:
Steve Chamberlain 1994-04-20 05:55:28 +00:00
parent dcfb710401
commit a0fbc3a981
1 changed files with 16 additions and 13 deletions
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29
gcc/flow.c
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@ -2148,16 +2148,16 @@ find_auto_inc (needed, x, insn)
reg_n_calls_crossed[regno]++;
}
if (win)
if (win
/* If we have found a suitable auto-increment, do
POST_INC around the register here, and patch out the
increment instruction that follows. */
&& validate_change (insn, &XEXP (x, 0),
gen_rtx ((INTVAL (XEXP (y, 1)) == size
? (offset ? PRE_INC : POST_INC)
: (offset ? PRE_DEC : POST_DEC)),
Pmode, addr), 0))
{
/* We have found a suitable auto-increment: do POST_INC around
the register here, and patch out the increment instruction
that follows. */
XEXP (x, 0) = gen_rtx ((INTVAL (XEXP (y, 1)) == size
? (offset ? PRE_INC : POST_INC)
: (offset ? PRE_DEC : POST_DEC)),
Pmode, addr);
/* Record that this insn has an implicit side effect. */
REG_NOTES (insn)
= gen_rtx (EXPR_LIST, REG_INC, addr, REG_NOTES (insn));
@ -2617,10 +2617,13 @@ try_pre_increment (insn, reg, amount)
if (GET_MODE_SIZE (GET_MODE (use)) != (amount > 0 ? amount : - amount))
return 0;
XEXP (use, 0) = gen_rtx (amount > 0
? (do_post ? POST_INC : PRE_INC)
: (do_post ? POST_DEC : PRE_DEC),
Pmode, reg);
/* See if this combination of instruction and addressing mode exists. */
if (! validate_change (insn, &XEXP (use, 0),
gen_rtx (amount > 0
? (do_post ? POST_INC : PRE_INC)
: (do_post ? POST_DEC : PRE_DEC),
Pmode, reg), 0))
return 0;
/* Record that this insn now has an implicit side effect on X. */
REG_NOTES (insn) = gen_rtx (EXPR_LIST, REG_INC, reg, REG_NOTES (insn));