PR libmudflap/36397

	* tree-mudflap.c (mf_xform_derefs_1): Handle VIEW_CONVERT_EXPR.

	* testsuite/libmudflap.c/pass64-frag.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@140374 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 43 insertions, 0 deletions

diff --git a/libmudflap/ChangeLog b/libmudflap/ChangeLog
index e9eec1050f4..6a879243c9c 100644
--- a/libmudflap/ChangeLog
+++ b/libmudflap/ChangeLog
@@ -1,3 +1,8 @@
+2008-09-15  Jakub Jelinek  <jakub@redhat.com>
+
+	PR libmudflap/36397
+	* testsuite/libmudflap.c/pass64-frag.c: New test.
+
 2008-06-17  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	* Makefile.in: Regenerate.
diff --git a/libmudflap/testsuite/libmudflap.c/pass64-frag.c b/libmudflap/testsuite/libmudflap.c/pass64-frag.c
new file mode 100644
index 00000000000..856eec0fa7e
--- /dev/null
+++ b/libmudflap/testsuite/libmudflap.c/pass64-frag.c
@@ -0,0 +1,38 @@
+/* PR libmudflap/36397 */
+/* { dg-do run } */
+/* { dg-options "-O -fmudflap -fno-strict-aliasing -lmudflap" } */
+
+struct A
+{
+  int a[2];
+};
+
+long long int x;
+
+int __attribute__ ((noinline))
+baz (long long int *x)
+{
+  return *x;
+}
+
+int __attribute__ ((noinline))
+foo (int i)
+{
+  if (i > 10)
+    return baz (&x);
+  return ((struct A *) &x)->a[i];
+}
+
+int
+main (void)
+{
+  if (sizeof (long long) == 2 * sizeof (int)
+      && sizeof (long long) == sizeof (struct A))
+    {
+      struct A a = { .a[0] = 10, .a[1] = 20 };
+      __builtin_memcpy (&x, &a, sizeof (x));
+      if (foo (0) != 10 || foo (1) != 20)
+        __builtin_abort ();
+    }
+  return 0;
+}