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expr.c (store_expr): Don't generate load-store pair if TEMP is identical (according to ==) with TARGET. 

* expr.c (store_expr): Don't generate load-store pair
	if TEMP is identical (according to ==) with TARGET.

From-SVN: r23696
This commit is contained in:
J"orn Rennecke 1998-11-18 14:15:03 +00:00 committed by Joern Rennecke
parent 59e76fc6ba
commit f3f2255a8c
2 changed files with 18 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Nov 18 22:13:00 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* expr.c (store_expr): Don't generate load-store pair
if TEMP is identical (according to ==) with TARGET.
Tue Nov 17 22:25:16 1998 J"orn Rennecke <amylaar@cygnus.co.uk>
* reload1.c (reload_reg_free_for_value_p): When considered reload

15
gcc/expr.c
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@ -3676,10 +3676,21 @@ store_expr (exp, target, want_value)
/* If value was not generated in the target, store it there.
Convert the value to TARGET's type first if nec. */
/* If TEMP and TARGET compare equal according to rtx_equal_p, but
one or both of them are volatile memory refs, we have to distinguish
two cases:
- expand_expr has used TARGET. In this case, we must not generate
another copy. This can be detected by TARGET being equal according
to == .
- expand_expr has not used TARGET - that means that the source just
happens to have the same RTX form. Since temp will have been created
by expand_expr, it will compare unequal according to == .
We must generate a copy in this case, to reach the correct number
of volatile memory references. */
if ((! rtx_equal_p (temp, target)
|| side_effects_p (temp)
|| side_effects_p (target))
|| (temp != target && (side_effects_p (temp)
|| side_effects_p (target))))
&& TREE_CODE (exp) != ERROR_MARK)
{
target = protect_from_queue (target, 1);