1 files changed, 33 insertions, 0 deletions
diff --git a/gcc-4.8/gcc/testsuite/gcc.target/i386/pr51987.c b/gcc-4.8/gcc/testsuite/gcc.target/i386/pr51987.c
new file mode 100644
index 000000000..6ac2e6395
--- /dev/null
+++ b/gcc-4.8/gcc/testsuite/gcc.target/i386/pr51987.c
@@ -0,0 +1,33 @@
+/* PR tree-optimization/51987 */
+/* { dg-do run { target { ! { ia32 } } } } */
+/* { dg-options "-O3" } */
+
+extern void abort (void);
+union U { unsigned long long l; struct { unsigned int l, h; } i; };
+
+__attribute__((noinline, noclone)) void
+foo (char *x, char *y)
+{
+  int i;
+  for (i = 0; i < 64; i++)
+    {
+      union U u;
+      asm ("movl %1, %k0; salq $32, %0" : "=r" (u.l) : "r" (i));
+      x[i] = u.i.h;
+      union U v;
+      asm ("movl %1, %k0; salq $32, %0" : "=r" (v.l) : "r" (i));
+      y[i] = v.i.h;
+    }
+}
+
+int
+main ()
+{
+  char a[64], b[64];
+  int i;
+  foo (a, b);
+  for (i = 0; i < 64; i++)
+    if (a[i] != i || b[i] != i)
+      abort ();
+  return 0;
+}