[PATCH][PR63661]Add a test case for trunk.

[Renlin Li]

Hi all,

PR63661 is effectively fixed by my previous patch here: 
https://gcc.gnu.org/ml/gcc-patches/2014-11/msg02253.html

This patch add a test case for it.

Okay for trunk?

gcc/testsuite/ChangeLog:

2014-11-27  Renlin Li  <renlin...@arm.com>

     PR target/63661
    * gcc.target/i386/pr63661.c: New.diff --git a/gcc/testsuite/gcc.target/i386/pr63661.c b/gcc/testsuite/gcc.target/i386/pr63661.c
new file mode 100644
index 0000000..8b55146
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr63661.c
@@ -0,0 +1,77 @@
+/* PR target/63661 */
+/* { dg-do run } */
+/* { dg-require-effective-target fpic } */
+/* { dg-options "-mtune=nehalem -fPIC -O2" } */
+
+static void __attribute__((noinline,noclone,hot))
+foo (double a, double q, double *ff, double *gx, int e, int ni)
+{
+  union
+    {
+      double n;
+      unsigned long long o;
+    } punner;
+
+  punner.n = q;
+   __builtin_printf("B: 0x%016llx ---- %g\n", punner.o, q);
+
+  if(q != 5)
+    __builtin_abort();
+}
+
+static int __attribute__((noinline,noclone,hot))
+bar (int order, double q, double c[])
+{
+  int ni, nn, i, e;
+  double g2, x2, de, s, ratio, ff;
+
+  nn = 0;
+  e = order & 1;
+  s = 0;
+  ratio = 0;
+  x2 = 0;
+  g2 = 0;
+
+  if(q == 0.0)
+    return 0;
+
+  if (order < 5)
+    {
+      ratio = 1.0 / q;
+      nn = order;
+    }
+
+  ni = -nn;
+
+  while(1)
+    {
+      de = ratio - g2 - x2;
+
+      foo (0, q, &ff, &g2, e, ni);
+
+      if((int)de == 0)
+        break;
+    }
+
+  s += 2 * nn * c[nn];
+
+  for (i = 0; i < 1; i++)
+    {
+      c[0] = nn;
+      for (; i < 10; i++)
+        c[i] = 0.0;
+      c[0] /= s;
+    }
+
+  return 0;
+}
+
+int
+main ()
+{
+  double c[1000];
+
+  __builtin_printf("A: 0x%016llx\n", (unsigned long long)c);
+  bar (1, 5.0, c);
+  return 0;
+}