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sched.c (update_flow_info): Handle death notes made invalid by instruction splitting.

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�
        * sched.c (update_flow_info): Handle death notes made invalid by
        instruction splitting.  Partially reverts Oct 15, 1998 patch.
        * haifa-sched.c (update_flow_info): Likewise.

From-SVN: r23171
This commit is contained in:
Jeff Law 1998-10-19 03:44:36 -06:00
parent 5f5702e21c
commit 02bc973394
1 changed files with 15 additions and 1 deletions
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14
gcc/sched.c
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@ -3829,6 +3829,20 @@ update_flow_info (notes, first, last, orig_insn)
pattern, so we can safely ignore it. */
if (insn == first)
{
/* We have accurate death notes after reload now, but this
code is still necessary. Consider splitting a store into
(subreg:DF (reg:DC) 0). The death notes will claim the
entire DCmode value is dead. But after splitting we know
that only part of it is dead. Ie, the splitting action
actually eliminated the death of one or more hard
registers. */
if (reload_completed && REG_NOTE_KIND (note) == REG_DEAD)
{
XEXP (note, 1) = REG_NOTES (insn);
REG_NOTES (insn) = note;
break;
}
if (REG_NOTE_KIND (note) != REG_UNUSED)
abort ();