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reorg.c (fill_simple_delay_slots): Always try to fill empty delay slots with insns from beyond the delay insn...

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* reorg.c (fill_simple_delay_slots): Always try to fill empty
	delay slots with insns from beyond the delay insn, even if
	optimize_skip was attempted.
	(fill_simple_delay_slots): When filling with insns from after the
	delay insn, make sure to always account for sets and references
	in the delay insn.

From-SVN: r1931
This commit is contained in:
Jeff Law 1992-08-21 16:33:02 -06:00
parent 415f583ec9
commit 2f9ba5a9a3
1 changed files with 18 additions and 13 deletions
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31
gcc/reorg.c
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@ -2342,15 +2342,13 @@ fill_simple_delay_slots (first, non_jumps_p)
mark_referenced_resources (trial, &needed, 1);
}
if (slots_filled == slots_to_fill)
/* happy. */ ;
/* If all needed slots haven't been filled, we come here. */
/* Try to optimize case of jumping around a single insn. */
#if defined(ANNUL_IFFALSE_SLOTS) || defined(ANNUL_IFTRUE_SLOTS)
else if (delay_list == 0
&& GET_CODE (insn) == JUMP_INSN && condjump_p (insn))
if (slots_filled != slots_to_fill
&& delay_list == 0
&& GET_CODE (insn) == JUMP_INSN && condjump_p (insn))
{
delay_list = optimize_skip (insn);
if (delay_list)
@ -2382,9 +2380,10 @@ fill_simple_delay_slots (first, non_jumps_p)
later unconditional jump branches to. In that case, we don't
care about the number of uses of our label. */
else if (GET_CODE (insn) != JUMP_INSN
|| (condjump_p (insn) && ! simplejump_p (insn)
&& JUMP_LABEL (insn) != 0))
if (slots_filled != slots_to_fill
&& (GET_CODE (insn) != JUMP_INSN
|| (condjump_p (insn) && ! simplejump_p (insn)
&& JUMP_LABEL (insn) != 0)))
{
rtx target = 0;
int maybe_never = 0;
@ -2401,12 +2400,18 @@ fill_simple_delay_slots (first, non_jumps_p)
mark_referenced_resources (insn, &needed, 1);
maybe_never = 1;
}
else if (GET_CODE (insn) == JUMP_INSN)
else
{
/* Get our target and show how many more uses we want to
see before we hit the label. */
target = JUMP_LABEL (insn);
target_uses = LABEL_NUSES (target) - 1;
mark_set_resources (insn, &set, 0, 0);
mark_referenced_resources (insn, &needed, 0);
if (GET_CODE (insn) == JUMP_INSN)
{
/* Get our target and show how many more uses we want to
see before we hit the label. */
target = JUMP_LABEL (insn);
target_uses = LABEL_NUSES (target) - 1;
}
}
for (trial = next_nonnote_insn (insn); trial; trial = next_trial)