(safe_from_p): Only safe if EXP is variable-size and X is BLKmode.

From-SVN: r10243

diff --git a/gcc/expr.c b/gcc/expr.c
index 421f9423663e697633467c44a68469956594eb23..5e5b3b31c4cb3a301a3a6539025fd67f4ece7b18 100644 (file)
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -3814,9 +3814,11 @@ safe_from_p (x, exp)
       /* If EXP has varying size, we MUST use a target since we currently
         have no way of allocating temporaries of variable size.  So we
         assume here that something at a higher level has prevented a
-        clash.  This is somewhat bogus, but the best we can do.  */
+        clash.  This is somewhat bogus, but the best we can do.  Only
+        do this when X is BLKmode.  */
       || (TREE_TYPE (exp) != 0 && TYPE_SIZE (TREE_TYPE (exp)) != 0
-         && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST))
+         && TREE_CODE (TYPE_SIZE (TREE_TYPE (exp))) != INTEGER_CST
+         && GET_MODE (x) == BLKmode))
     return 1;
 
   /* If this is a subreg of a hard register, declare it unsafe, otherwise,