expmed.c (emit_store_flag): Don't test BITS_PER_WORD * 2 wide volatile memory by parts.

	* expmed.c (emit_store_flag): Don't test BITS_PER_WORD * 2
	wide volatile memory by parts.

	* gcc.c-torture/compile/20020304-2.c: New test.

From-SVN: r50314

gcc/ChangeLog

 2002-03-05  Jakub Jelinek  <jakub@redhat.com>
 
+	* expmed.c (emit_store_flag): Don't test BITS_PER_WORD * 2
+	wide volatile memory by parts.
+
+2002-03-05  Jakub Jelinek  <jakub@redhat.com>
+
 	* ssa-ccp.c (ssa_ccp_substitute_constants): Don't crash if def
 	is NULL.
 

gcc/expmed.c

@@ -4278,7 +4278,8 @@ emit_store_flag (target, code, op0, op1, mode, unsignedp, normalizep)
      the comparison into one involving a single word.  */
   if (GET_MODE_BITSIZE (mode) == BITS_PER_WORD * 2
       && GET_MODE_CLASS (mode) == MODE_INT
-      && op1 == const0_rtx)
+      && op1 == const0_rtx
+      && (GET_CODE (op0) != MEM || ! MEM_VOLATILE_P (op0)))
     {
       if (code == EQ || code == NE)
 	{

gcc/testsuite/ChangeLog

@@ -2,6 +2,8 @@
 
 	* gcc.dg/20020304-1.c: New test.
 
+	* gcc.c-torture/compile/20020304-2.c: New test.
+
 2002-03-04  Zack Weinberg  <zack@codesourcery.com>
 
 	* gcc.c-torture/compile/20020304-1.c: New test case

gcc/testsuite/gcc.c-torture/compile/20020304-2.c

+/* This testcase ICEd because a SUBREG of MEM/v was never
+   simplified.  */
+volatile unsigned long long *a;
+
+unsigned char
+foo (void)
+{
+  unsigned char b = (*a != 0);
+  return b;
+}