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reg-stack.c (subst_stack_regs_pat): Handle correctly USEs of dead registers.

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* reg-stack.c (subst_stack_regs_pat): Handle correctly USEs of
	dead registers.

From-SVN: r31588
This commit is contained in:
Jan Hubicka 2000-01-24 19:58:32 +01:00 • committed by Jan Hubicka
parent 564d80f490
commit eedf2f550c
2 changed files with 8 additions and 15 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Jan 24 19:49:47 MET 2000 Jan Hubicka <jh@suse.cz>
* reg-stack.c (subst_stack_regs_pat): Handle correctly USEs of
dead registers.
Mon Jan 24 17:37:31 MET 2000 Jan Hubicka <jh@suse.cz>
* i386.h (FIRST_PSEUDO_REGISTER): Set to 21.

18
gcc/reg-stack.c
View file

@ -1383,24 +1383,12 @@ subst_stack_regs_pat (insn, regstack, pat)
if (STACK_REG_P (*src)
&& find_regno_note (insn, REG_DEAD, REGNO (*src)))
{
/* In stupid allocation the USE might be used to extend lifetime
of variable to given scope. This may end up as USE of dead
register. */
if (optimize || get_hard_regnum (regstack, *src) != -1)
emit_pop_insn (insn, regstack, *src, EMIT_AFTER);
emit_pop_insn (insn, regstack, *src, EMIT_AFTER);
return;
}
/* ??? Uninitialized USE should not happen. */
else if (get_hard_regnum (regstack, *src) == -1)
{
if (optimize)
abort();
if (GET_CODE (PATTERN (insn)) != USE)
abort();
PATTERN (insn) = gen_rtx_SET (GET_MODE (*src), *src,
CONST0_RTX (GET_MODE (*src)));
subst_stack_regs_pat (insn, regstack, PATTERN (insn));
return;
}
abort();
break;
case CLOBBER: