From: Richard Kenner <kenner@gcc.gnu.org>
Date: Tue, 31 May 1994 11:20:06 +0000 (-0400)
Subject: (note_addr_stored): A SET or CLOBBER of a BLKmode MEM means that all
X-Git-Tag: misc/cutover-egcs-0~6548
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ca800983cb2c749676dc33d52c752ecdee1e0e15;p=thirdparty%2Fgcc.git

(note_addr_stored): A SET or CLOBBER of a BLKmode MEM means that all
memory is clobbered.

From-SVN: r7395
---

diff --git a/gcc/loop.c b/gcc/loop.c
index 17ef97a2776f..624329b1afbd 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -2593,6 +2593,10 @@ note_addr_stored (x)
      This affects heuristics in strength_reduce.  */
   num_mem_sets++;
 
+  /* BLKmode MEM means all memory is clobbered.  */
+  if (GET_MODE (x) == BLKmode)
+    unknown_address_altered = 1;
+
   if (unknown_address_altered)
     return;
 
@@ -2601,10 +2605,9 @@ note_addr_stored (x)
 	&& MEM_IN_STRUCT_P (x) == MEM_IN_STRUCT_P (loop_store_mems[i]))
       {
 	/* We are storing at the same address as previously noted.  Save the
-	   wider reference, treating BLKmode as wider.  */
-	if (GET_MODE (x) == BLKmode
-	    || (GET_MODE_SIZE (GET_MODE (x))
-		> GET_MODE_SIZE (GET_MODE (loop_store_mems[i]))))
+	   wider reference.  */
+	if (GET_MODE_SIZE (GET_MODE (x))
+	    > GET_MODE_SIZE (GET_MODE (loop_store_mems[i])))
 	  loop_store_mems[i] = x;
 	break;
       }