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Fix x86 memset bug, reported by Karl Guenter Wuensch.

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* expr.c (expand_builtin, case BUILT_IN_MEMSET): Break if either
	val or len has TREE_SIDE_EFFECTS set.

From-SVN: r19471
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Jim Wilson 1998-04-28 19:12:47 +00:00 committed by Jim Wilson
parent 2cea586a7e
commit bf931ec829
2 changed files with 12 additions and 0 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Tue Apr 28 17:53:33 1998 Jim Wilson <wilson@cygnus.com>
* expr.c (expand_builtin, case BUILT_IN_MEMSET): Break if either
val or len has TREE_SIDE_EFFECTS set.
* sparc.md (mulsidi3): Call const v8plus and v8plus routines.
(mulsidi3_v8plus, const_mulsidi3_v8plus): Delete asterisk from name.
(smuldi3_highpart): Call const v8plus routine.

9
gcc/expr.c
View File

@ -8609,6 +8609,15 @@ expand_builtin (exp, target, subtarget, mode, ignore)
if (dest_align == 0)
break;
/* If the arguments have side-effects, then we can only evaluate
them at most once. The following code evaluates them twice if
they are not constants because we break out to expand_call
in that case. They can't be constants if they have side-effects
so we can check for that first. Alternatively, we could call
save_expr to make multiple evaluation safe. */
if (TREE_SIDE_EFFECTS (val) || TREE_SIDE_EFFECTS (len))
break;
/* If VAL is not 0, don't do this operation in-line. */
if (expand_expr (val, NULL_RTX, VOIDmode, 0) != const0_rtx)
break;