re PR middle-end/69909 (wrong code with -Os and vectors @ x86_64)

	PR middle-end/69909
	* expr.c (expand_expr_real_1) <normal_inner_ref>: Avoid
	set_mem_attributes if tem is SSA_NAME which got expanded
	as a MEM.

	* gcc.dg/torture/pr69909.c: New test.

Co-Authored-By: Richard Biener <rguenther@suse.de>

From-SVN: r233656

gcc/ChangeLog

+2016-02-24  Jakub Jelinek  <jakub@redhat.com>
+	    Richard Biener  <rguenth@suse.de>
+
+	PR middle-end/69909
+	* expr.c (expand_expr_real_1) <normal_inner_ref>: Avoid
+	set_mem_attributes if tem is SSA_NAME which got expanded
+	as a MEM.
+
 2016-02-24  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/69907

gcc/expr.c

@@ -10521,7 +10521,11 @@ expand_expr_real_1 (tree exp, rtx target, machine_mode tmode,
 	if (op0 == orig_op0)
 	  op0 = copy_rtx (op0);
 
-	set_mem_attributes (op0, exp, 0);
+	/* Don't set memory attributes if the base expression is
+	   SSA_NAME that got expanded as a MEM.  In that case, we should
+	   just honor its original memory attributes.  */
+	if (TREE_CODE (tem) != SSA_NAME || !MEM_P (orig_op0))
+	  set_mem_attributes (op0, exp, 0);
 
 	if (REG_P (XEXP (op0, 0)))
 	  mark_reg_pointer (XEXP (op0, 0), MEM_ALIGN (op0));

gcc/testsuite/ChangeLog

+2016-02-24  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/69909
+	* gcc.dg/torture/pr69909.c: New test.
+
 2016-02-24  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/69907

gcc/testsuite/gcc.dg/torture/pr69909.c

+/* PR middle-end/69909 */
+/* { dg-do run { target int128 } } */
+/* { dg-additional-options "-w" } */
+
+typedef unsigned V __attribute__ ((vector_size (32)));
+typedef __int128 T;
+typedef __int128 U __attribute__ ((vector_size (32)));
+
+__attribute__((noinline, noclone)) T
+foo (T a, V b, V c, V d, V e, U f)
+{
+  d[6] ^= 0x10;
+  f -= (U) d;
+  f[1] |= f[1] << (a & 127);
+  c ^= d;
+  return b[7] + c[2] + c[2] + d[6] + e[2] + f[1];
+}
+
+int
+main ()
+{
+  if (__CHAR_BIT__ != 8 || sizeof (unsigned) != 4 || sizeof (T) != 16)
+    return 0;
+
+  T x = foo (1, (V) { 9, 2, 5, 8, 1, 2, 9, 3 },
+		(V) { 1, 2, 3, 4, 5, 6, 7, 8 },
+		(V) { 4, 1, 2, 9, 8, 3, 5, 2 },
+		(V) { 3, 6, 1, 3, 2, 9, 4, 8 }, (U) { 3, 5 });
+  if (((unsigned long long) (x >> 64) != 0xffffffffffffffffULL
+       || (unsigned long long) x != 0xfffffffe0000001aULL)
+      && ((unsigned long long) (x >> 64) != 0xfffffffffffffffdULL
+	  || (unsigned long long) x != 0xffffffff00000022ULL))
+    __builtin_abort ();
+  return 0;
+}