[PATCH] Test cases for PR77937

[Bill Schmidt]

Here are torture test cases for
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77937.  Markus Trippelsdorf
kindly provided the source for the tests and verified the correct
dejagnu options on x86_64-pc-linux-gnu.  Committed.

Thanks,
Bill


2016-10-13  Bill Schmidt  <wschm...@linux.vnet.ibm.com>

        PR tree-optimization/77937
        * gcc.dg/torture/pr77937-1.c: New.
        * gcc.dg/torture/pr77937-2.c: New.


Index: gcc/testsuite/gcc.dg/torture/pr77937-1.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr77937-1.c    (revision 0)
+++ gcc/testsuite/gcc.dg/torture/pr77937-1.c    (working copy)
@@ -0,0 +1,14 @@
+/* { dg-do compile } */
+/* { dg-do options "-O3 -march=amdfam10" { target { x86_64-*-* } } } */
+
+int *a;
+int b, c, d;
+void fn1(char *p1, int p2) {
+  int x;
+  while (1) {
+    x = 0;
+    for (; x < 8; x++)
+      p1[0] = -a[0] * d + p1[0] * c + 1 >> b >> 1;
+    p1 += p2;
+  }
+}
Index: gcc/testsuite/gcc.dg/torture/pr77937-2.c
===================================================================
--- gcc/testsuite/gcc.dg/torture/pr77937-2.c    (revision 0)
+++ gcc/testsuite/gcc.dg/torture/pr77937-2.c    (working copy)
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-do options "-O3 -march=amdfam10" { target { x86_64-*-* } } } */
+
+extern int fn2(int);
+extern int fn3(int);
+int a, b, c;
+void fn1(long p1) {
+  char *d;
+  for (;; d += p1) {
+    d[0] = fn2(1 >> a);
+    fn3(0);
+    fn3(c >> a);
+    d[1] = fn3(d[1] * b + c >> a);
+    d[4] = fn3(d[4] * b + c >> a);
+    d[5] = fn3(d[5] * b + c >> a);
+  }
+}