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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@233656 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dc87f1b..03f7a32 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+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

diff --git a/gcc/expr.c b/gcc/expr.c
index 1b89a63..29d22b0 100644 (file)
--- a/gcc/expr.c
+++ b/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));

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d716932..f09672b 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+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

diff --git a/gcc/testsuite/gcc.dg/torture/pr69909.c b/gcc/testsuite/gcc.dg/torture/pr69909.c
new file mode 100644 (file)
index 0000000..fb36c80
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr69909.c
@@ -0,0 +1,35 @@
+/* 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;
+}