Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 47 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.c-torture/execute/pr15262-1.c b/gcc-4.9/gcc/testsuite/gcc.c-torture/execute/pr15262-1.c
new file mode 100644
index 000000000..f6a6fe40b
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.c-torture/execute/pr15262-1.c
@@ -0,0 +1,47 @@
+/* PR 15262.
+   The alias analyzer only considers relations between pointers and
+   symbols.  If two pointers P and Q point to the same symbol S, then
+   their respective memory tags will either be the same or they will
+   have S in their alias set.
+   
+   However, if there are no common symbols between P and Q, TBAA will
+   currently miss their alias relationship altogether.  */
+struct A
+{
+  int t;
+  int i;
+};
+
+int foo () { return 3; }
+
+main ()
+{
+  struct A loc, *locp;
+  float f, g, *p;
+  int T355, *T356;
+
+  /* Avoid the partial hack in TBAA that would consider memory tags if
+     the program had no addressable symbols.  */
+  f = 3;
+  g = 2;
+  p = foo () ? &g : &f;
+  if (*p > 0.0)
+    g = 1;
+
+  /* Store into *locp and cache its current value.  */
+  locp = malloc (sizeof (*locp));
+  locp->i = 10;
+  T355 = locp->i;
+
+  /* Take the address of one of locp's fields and write to it.  */
+  T356 = &locp->i;
+  *T356 = 1;
+
+  /* Read the recently stored value.  If TBAA fails, this will appear
+     as a redundant load that will be replaced with '10'.  */
+  T355 = locp->i;
+  if (T355 != 1)
+    abort ();
+
+  return 0;
+}