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flow.c (try_redirect_by_replacing_jump): Correctly compute which insns to delete in the presence of cc0 in a jump insn.

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* flow.c (try_redirect_by_replacing_jump): Correctly compute which
	insns to delete in the presence of cc0 in a jump insn.

From-SVN: r44217
This commit is contained in:
Richard Henderson 2001-07-20 20:05:09 -07:00 committed by Kazu Hirata
parent 3461fba7ad
commit e9644cfea1
2 changed files with 18 additions and 23 deletions
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3
gcc/ChangeLog
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@ -2,6 +2,9 @@
* doc/rtl.texi (REG_DEAD): Update for current semantics.
* flow.c (try_redirect_by_replacing_jump): Correctly compute which
insns to delete in the presence of cc0 in a jump insn.
Fri Jul 20 22:14:49 CEST 2001 Roman Zippel <zippel@linux-m68k.org>
Jan Hubicka <jh@suse.cz>

38
gcc/flow.c
View File

@ -1654,7 +1654,7 @@ try_redirect_by_replacing_jump (e, target)
basic_block target;
{
basic_block src = e->src;
rtx insn = src->end;
rtx insn = src->end, kill_from;
edge tmp;
rtx set;
int fallthru = 0;
@ -1671,19 +1671,24 @@ try_redirect_by_replacing_jump (e, target)
if (!set || side_effects_p (set))
return false;
/* In case we zap a conditional jump, we'll need to kill
the cc0 setter too. */
kill_from = insn;
#ifdef HAVE_cc0
if (reg_mentioned_p (cc0_rtx, PATTERN (insn)))
kill_from = PREV_INSN (insn);
#endif
/* See if we can create the fallthru edge. */
if (can_fallthru (src, target))
{
src->end = PREV_INSN (insn);
src->end = PREV_INSN (kill_from);
if (rtl_dump_file)
fprintf (rtl_dump_file, "Removing jump %i.\n", INSN_UID (insn));
flow_delete_insn (insn);
fallthru = 1;
/* Selectivly unlink whole insn chain. */
if (src->end != PREV_INSN (target->head))
flow_delete_insn_chain (NEXT_INSN (src->end),
PREV_INSN (target->head));
flow_delete_insn_chain (kill_from, PREV_INSN (target->head));
}
/* If this already is simplejump, redirect it. */
else if (simplejump_p (insn))
@ -1701,8 +1706,7 @@ try_redirect_by_replacing_jump (e, target)
rtx target_label = block_label (target);
rtx barrier;
src->end = PREV_INSN (insn);
src->end = emit_jump_insn_after (gen_jump (target_label), src->end);
src->end = emit_jump_insn_before (gen_jump (target_label), kill_from);
JUMP_LABEL (src->end) = target_label;
LABEL_NUSES (target_label)++;
if (basic_block_for_insn)
@ -1710,7 +1714,9 @@ try_redirect_by_replacing_jump (e, target)
if (rtl_dump_file)
fprintf (rtl_dump_file, "Replacing insn %i by jump %i\n",
INSN_UID (insn), INSN_UID (src->end));
flow_delete_insn (insn);
flow_delete_insn_chain (kill_from, insn);
barrier = next_nonnote_insn (src->end);
if (!barrier || GET_CODE (barrier) != BARRIER)
emit_barrier_after (src->end);
@ -1727,20 +1733,6 @@ try_redirect_by_replacing_jump (e, target)
e->probability = REG_BR_PROB_BASE;
e->count = src->count;
/* In case we've zapped an conditional jump, we need to kill the cc0
setter too if available. */
#ifdef HAVE_cc0
insn = src->end;
if (GET_CODE (insn) == JUMP_INSN)
insn = prev_nonnote_insn (insn);
if (sets_cc0_p (insn))
{
if (insn == src->end)
src->end = PREV_INSN (insn);
flow_delete_insn (insn);
}
#endif
/* We don't want a block to end on a line-number note since that has
the potential of changing the code between -g and not -g. */
while (GET_CODE (e->src->end) == NOTE