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(jump_optimize): Delete REG_LABEL note if label no longer in insn.

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From-SVN: r6745
This commit is contained in:
Richard Kenner 1994-03-11 08:29:36 -05:00
parent d18225c493
commit 484c392430
1 changed files with 12 additions and 2 deletions
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14
gcc/jump.c
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@ -143,7 +143,7 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
int noop_moves;
int after_regscan;
{
register rtx insn, next;
register rtx insn, next, note;
int changed;
int first = 1;
int max_uid = 0;
@ -151,7 +151,8 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
cross_jump_death_matters = (cross_jump == 2);
/* Initialize LABEL_NUSES and JUMP_LABEL fields. */
/* Initialize LABEL_NUSES and JUMP_LABEL fields. Delete any REG_LABEL
notes whose labels don't occur in the insn any more. */
for (insn = f; insn; insn = NEXT_INSN (insn))
{
@ -159,6 +160,15 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
LABEL_NUSES (insn) = (LABEL_PRESERVE_P (insn) != 0);
else if (GET_CODE (insn) == JUMP_INSN)
JUMP_LABEL (insn) = 0;
else if (GET_CODE (insn) == INSN || GET_CODE (insn) == CALL_INSN)
for (note = REG_NOTES (insn); note; note = next)
{
next = XEXP (note, 1);
if (REG_NOTE_KIND (note) == REG_LABEL
&& ! reg_mentioned_p (XEXP (note, 0), PATTERN (insn)))
remove_note (insn, note);
}
if (INSN_UID (insn) > max_uid)
max_uid = INSN_UID (insn);
}