(copy_rtx): A MEM with constant address is not sharable.

Undo Dec 27 change.

From-SVN: r3231

diff --git a/gcc/rtl.c b/gcc/rtl.c
index a47ebd536315cba95820812d79a863a354b5f3ba..aca057d6f97afbc7a651ca62959794da0b290c64 100644 (file)
--- a/gcc/rtl.c
+++ b/gcc/rtl.c
@@ -284,10 +284,10 @@ copy_rtx (orig)
        return orig;
       break;
 
-    case MEM:
-      if (CONSTANT_ADDRESS_P (XEXP (orig, 0)))
-       return orig;
-      break;
+      /* A MEM with a constant address is not sharable.  The problem is that
+        the constant address may need to be reloaded.  If the mem is shared,
+        then reloading one copy of this mem will cause all copies to appear
+        to have been reloaded.  */
     }
 
   copy = rtx_alloc (code);