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(find_dead_or_set_registers): Only kill spill regs after label made

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before jump2.

From-SVN: r11778
This commit is contained in:
Richard Kenner 1996-04-15 07:46:28 -04:00
parent bf8b4985ab
commit b55f96db06
1 changed files with 12 additions and 5 deletions
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17
gcc/reorg.c
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@ -133,6 +133,10 @@ Boston, MA 02111-1307, USA. */
/* Import list of registers used as spill regs from reload. */
extern HARD_REG_SET used_spill_regs;
/* Import highest label used in function at end of reload. */
extern int max_label_num_after_reload;
#ifdef DELAY_SLOTS
#define obstack_chunk_alloc xmalloc
@ -2468,11 +2472,14 @@ find_dead_or_set_registers (target, res, jump_target, jump_count, set, needed)
AND_COMPL_HARD_REG_SET (res->regs, pending_dead_regs);
CLEAR_HARD_REG_SET (pending_dead_regs);
/* All spill registers are dead at a label, so kill all of the
ones that aren't needed also. */
COPY_HARD_REG_SET (scratch, used_spill_regs);
AND_COMPL_HARD_REG_SET (scratch, needed.regs);
AND_COMPL_HARD_REG_SET (res->regs, scratch);
if (CODE_LABEL_NUMBER (insn) < max_label_num_after_reload)
{
/* All spill registers are dead at a label, so kill all of the
ones that aren't needed also. */
COPY_HARD_REG_SET (scratch, used_spill_regs);
AND_COMPL_HARD_REG_SET (scratch, needed.regs);
AND_COMPL_HARD_REG_SET (res->regs, scratch);
}
continue;
case BARRIER: