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re PR bootstrap/41241 (bootstrap comparison failure)

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PR bootstrap/41241
	* combine-stack-adj.c (try_apply_stack_adjustment): Handle stores.
	(combine_stack_adjustments_for_block): Allow insns between stack
	adjustments and stores with corresponding with pre-(dec|inc)rement
	or pre-modify.

From-SVN: r151463
This commit is contained in:
Eric Botcazou 2009-09-06 21:15:45 +00:00 committed by Eric Botcazou
parent 90588a106e
commit 1362aa3131
2 changed files with 38 additions and 20 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2009-09-06 Eric Botcazou <ebotcazou@adacore.com>
PR bootstrap/41241
* combine-stack-adj.c (try_apply_stack_adjustment): Handle stores.
(combine_stack_adjustments_for_block): Allow insns between stack
adjustments and stores with corresponding with pre-(dec|inc)rement
or pre-modify.
2009-09-06 Jakub Jelinek <jakub@redhat.com>
PR bootstrap/41241

50
gcc/combine-stack-adj.c
View File

@ -206,7 +206,12 @@ try_apply_stack_adjustment (rtx insn, struct csa_reflist *reflist,
rtx set;
set = single_set_for_csa (insn);
validate_change (insn, &XEXP (SET_SRC (set), 1), GEN_INT (new_adjust), 1);
if (MEM_P (SET_DEST (set)))
validate_change (insn, &SET_DEST (set),
replace_equiv_address (SET_DEST (set), stack_pointer_rtx),
1);
else
validate_change (insn, &XEXP (SET_SRC (set), 1), GEN_INT (new_adjust), 1);
for (ml = reflist; ml ; ml = ml->next)
{
@ -468,28 +473,33 @@ combine_stack_adjustments_for_block (basic_block bb)
continue;
}
/* Find a predecrement of exactly the previous adjustment and
turn it into a direct store. Obviously we can't do this if
there were any intervening uses of the stack pointer. */
if (reflist == NULL
&& MEM_P (dest)
&& ((GET_CODE (XEXP (dest, 0)) == PRE_DEC
&& (last_sp_adjust
== (HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (dest))))
|| (GET_CODE (XEXP (dest, 0)) == PRE_MODIFY
/* Find a store with pre-(dec|inc)rement or pre-modify of exactly
the previous adjustment and turn it into a simple store. This
is equivalent to anticipating the stack adjustment so this must
be an allocation. */
if (MEM_P (dest)
&& ((STACK_GROWS_DOWNWARD
? (GET_CODE (XEXP (dest, 0)) == PRE_DEC
&& last_sp_adjust
== (HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (dest)))
: (GET_CODE (XEXP (dest, 0)) == PRE_INC
&& last_sp_adjust
== -(HOST_WIDE_INT) GET_MODE_SIZE (GET_MODE (dest))))
|| ((STACK_GROWS_DOWNWARD
? last_sp_adjust >= 0 : last_sp_adjust <= 0)
&& GET_CODE (XEXP (dest, 0)) == PRE_MODIFY
&& GET_CODE (XEXP (XEXP (dest, 0), 1)) == PLUS
&& XEXP (XEXP (XEXP (dest, 0), 1), 0) == stack_pointer_rtx
&& (GET_CODE (XEXP (XEXP (XEXP (dest, 0), 1), 1))
== CONST_INT)
&& (INTVAL (XEXP (XEXP (XEXP (dest, 0), 1), 1))
== -last_sp_adjust)))
&& XEXP (XEXP (XEXP (dest, 0), 1), 0)
== stack_pointer_rtx
&& GET_CODE (XEXP (XEXP (XEXP (dest, 0), 1), 1))
== CONST_INT
&& INTVAL (XEXP (XEXP (XEXP (dest, 0), 1), 1))
== -last_sp_adjust))
&& XEXP (XEXP (dest, 0), 0) == stack_pointer_rtx
&& ! reg_mentioned_p (stack_pointer_rtx, src)
&& !reg_mentioned_p (stack_pointer_rtx, src)
&& memory_address_p (GET_MODE (dest), stack_pointer_rtx)
&& validate_change (insn, &SET_DEST (set),
replace_equiv_address (dest,
stack_pointer_rtx),
0))
&& try_apply_stack_adjustment (insn, reflist, 0,
-last_sp_adjust))
{
delete_insn (last_sp_set);
free_csa_reflist (reflist);