1 files changed, 93 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr27959.c b/gcc/testsuite/gcc.dg/pr27959.c
new file mode 100644
index 00000000000..7118aec73c6
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr27959.c
@@ -0,0 +1,93 @@
+/* PR middle-end/27959 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-options "-O2 -mtune=z990" { target s390*-*-* } } */
+
+extern void abort (void);
+
+struct B
+{
+  unsigned int b1, b2, b3;
+  char b4;
+};
+
+struct C
+{
+  char c1;
+};
+
+struct D
+{
+  char *d1;
+  struct C **d2;
+  unsigned int d3;
+};
+
+void
+__attribute__((noinline))
+foo (void *x, struct B *y, unsigned int *z)
+{
+  if (x)
+    abort ();
+  if (y->b1 != 7 || y->b2 != 5 || y->b3 != 3 || y->b4)
+    abort ();
+  if (*z != 2)
+    abort ();
+}
+
+int
+__attribute__((noinline))
+baz (unsigned int *x, unsigned int y)
+{
+  asm volatile ("" : : "r" (&x), "r" (&y) : "memory");
+  return *x + y;
+}
+
+inline int bar (unsigned int *x, unsigned int y)
+{
+  if (y < *x)
+    return 0;
+  return baz (x, y);
+}
+
+unsigned int *
+__attribute__((noinline))
+test (struct D *x, unsigned int *y)
+{
+  struct B b;
+  unsigned int c;
+
+  bar (y, x->d3);
+  if ((*(x->d2))->c1)
+    c = ((unsigned char) x->d1[0]
+	 + ((unsigned char) x->d1[1] << 8)
+	 + ((unsigned char) x->d1[2] << 16)
+	 + ((short) x->d1[3] << 24));
+  else
+    {
+      int d;
+      ((char *) &d)[0] = x->d1[0];
+      ((char *) &d)[1] = x->d1[1];
+      ((char *) &d)[2] = x->d1[2];
+      ((char *) &d)[3] = x->d1[3];
+      c = d;
+    }
+  b.b4 = 0;
+  b.b1 = c / 10000L % 10000;
+  b.b2 = c / 100 % 100;
+  b.b3 = c % 100;
+  foo (0, &b, y);
+  return y;
+}
+
+int
+main (void)
+{
+  unsigned int x = 900070503;
+  unsigned int y = 2;
+  struct C c = { 0 }, *cptr = &c;
+  struct D d = { (char *) &x, &cptr, 0 };
+  if (test (&d, &y) != &y)
+    abort ();
+  return 0;
+}