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reorg.c (emit_delay_sequence): Remove death notes, not merely nop them out.

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* reorg.c (emit_delay_sequence): Remove death notes, not merely
        nop them out.  Increment label reference count for REG_LABEL.
        (fill_slots_from_thread): Frob label reference count around
        delete_related_insns.

From-SVN: r48580
This commit is contained in:
Richard Henderson 2002-01-06 02:25:07 -08:00 committed by Richard Henderson
parent 9efc7479a2
commit e41c78316b
2 changed files with 41 additions and 6 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2002-01-06 Richard Henderson <rth@redhat.com>
* reorg.c (emit_delay_sequence): Remove death notes, not merely
nop them out. Increment label reference count for REG_LABEL.
(fill_slots_from_thread): Frob label reference count around
delete_related_insns.
2002-01-05 Richard Henderson <rth@redhat.com>
* cfgcleanup.c (try_forward_edges): Detect infinite loops while

40
gcc/reorg.c
View File

@ -489,7 +489,7 @@ emit_delay_sequence (insn, list, length)
for (li = list; li; li = XEXP (li, 1), i++)
{
rtx tem = XEXP (li, 0);
rtx note;
rtx note, next;
/* Show that this copy of the insn isn't deleted. */
INSN_DELETED_P (tem) = 0;
@ -498,11 +498,26 @@ emit_delay_sequence (insn, list, length)
PREV_INSN (tem) = XVECEXP (seq, 0, i - 1);
NEXT_INSN (XVECEXP (seq, 0, i - 1)) = tem;
/* Remove any REG_DEAD notes because we can't rely on them now
that the insn has been moved. */
for (note = REG_NOTES (tem); note; note = XEXP (note, 1))
if (REG_NOTE_KIND (note) == REG_DEAD)
XEXP (note, 0) = const0_rtx;
for (note = REG_NOTES (tem); note; note = next)
{
next = XEXP (note, 1);
switch (REG_NOTE_KIND (note))
{
case REG_DEAD:
/* Remove any REG_DEAD notes because we can't rely on them now
that the insn has been moved. */
remove_note (tem, note);
break;
case REG_LABEL:
/* Keep the label reference count up to date. */
LABEL_NUSES (XEXP (note, 0)) ++;
break;
default:
break;
}
}
}
NEXT_INSN (XVECEXP (seq, 0, length)) = NEXT_INSN (seq_insn);
@ -2703,6 +2718,8 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
starting point of this thread. */
if (own_thread)
{
rtx note;
update_block (trial, thread);
if (trial == thread)
{
@ -2710,7 +2727,18 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
if (new_thread == trial)
new_thread = thread;
}
/* We are moving this insn, not deleting it. We must
temporarily increment the use count on any referenced
label lest it be deleted by delete_related_insns. */
note = find_reg_note (trial, REG_LABEL, 0);
if (note)
LABEL_NUSES (XEXP (note, 0))++;
delete_related_insns (trial);
if (note)
LABEL_NUSES (XEXP (note, 0))--;
}
else
new_thread = next_active_insn (trial);