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expr.c (store_expr): Add dont_store_target.

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* expr.c (store_expr): Add dont_store_target.  If temp is already in
	target before copying to reg, don't store it into target again.

From-SVN: r40437
This commit is contained in:
Jakub Jelinek 2001-03-13 13:09:31 +01:00 committed by Jakub Jelinek
parent f76a40c8dc
commit e5408e5240
2 changed files with 17 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-03-13 Jakub Jelinek <jakub@redhat.com>
* expr.c (store_expr): Add dont_store_target. If temp is already in
target before copying to reg, don't store it into target again.
2001-03-12 Neil Booth <neil@daikokuya.demon.co.uk>
* cppinternals.texi: Update for file handling.

14
gcc/expr.c
View File

@ -3905,6 +3905,7 @@ store_expr (exp, target, want_value)
{
register rtx temp;
int dont_return_target = 0;
int dont_store_target = 0;
if (TREE_CODE (exp) == COMPOUND_EXPR)
{
@ -3975,7 +3976,15 @@ store_expr (exp, target, want_value)
{
temp = expand_expr (exp, target, GET_MODE (target), 0);
if (GET_MODE (temp) != BLKmode && GET_MODE (temp) != VOIDmode)
temp = copy_to_reg (temp);
{
/* If TEMP is already in the desired TARGET, only copy it from
memory and don't store it there again. */
if (temp == target
|| (rtx_equal_p (temp, target)
&& ! side_effects_p (temp) && ! side_effects_p (target)))
dont_store_target = 1;
temp = copy_to_reg (temp);
}
dont_return_target = 1;
}
else if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
@ -4105,7 +4114,8 @@ store_expr (exp, target, want_value)
if ((! rtx_equal_p (temp, target)
|| (temp != target && (side_effects_p (temp)
|| side_effects_p (target))))
&& TREE_CODE (exp) != ERROR_MARK)
&& TREE_CODE (exp) != ERROR_MARK
&& ! dont_store_target)
{
target = protect_from_queue (target, 1);
if (GET_MODE (temp) != GET_MODE (target)