[committed] Add testcases for 2 fixed PRs (PR rtl-optimization/8336[34])

[Jakub Jelinek]

Hi!

These 2 PRs were fixed with r255506, I've tested these testcases
on x86_64-linux {-m32,-m64} with current trunk as well as trunk before that
change (where it FAILed) and committed to trunk as obvious.

2017-12-12  Jakub Jelinek  <ja...@redhat.com>

        PR rtl-optimization/83363
        PR rtl-optimization/83364
        * gcc.dg/pr83363.c: New test.
        * gcc.dg/pr83364.c: New test.

--- gcc/testsuite/gcc.dg/pr83363.c.jj   2017-12-12 10:46:08.639485075 +0100
+++ gcc/testsuite/gcc.dg/pr83363.c      2017-12-12 10:43:03.253793460 +0100
@@ -0,0 +1,26 @@
+/* PR rtl-optimization/83363 */
+/* { dg-do run } */
+/* { dg-options "-O2 -fno-forward-propagate" } */
+
+unsigned char a;
+unsigned int b;
+
+static unsigned short __attribute__ ((noinline, noclone))
+foo (unsigned short x)
+{
+  x -= b;
+  x <<= x == 0;
+  a = ~0;
+  a >>= (unsigned char) x == 0;
+  x *= a -= ~a;
+  return x;
+}
+
+int
+main ()
+{
+  asm volatile ("" : : : "memory");
+  if (foo (3) != (unsigned short) (3 * (unsigned char) ~0))
+    __builtin_abort ();
+  return 0;
+}
--- gcc/testsuite/gcc.dg/pr83364.c.jj   2017-12-12 10:46:11.422450423 +0100
+++ gcc/testsuite/gcc.dg/pr83364.c      2017-12-12 10:46:02.486561690 +0100
@@ -0,0 +1,22 @@
+/* PR rtl-optimization/83364 */
+/* { dg-do run } */
+/* { dg-options "-O -fno-forward-propagate -fno-tree-coalesce-vars 
-fno-tree-ter" } */
+
+int a;
+
+static int __attribute__ ((noinline, noclone))
+foo (unsigned char c)
+{
+  c <<= (long long) c != a;
+  c = c << 7 | c >> 1;
+  return c;
+}
+
+int
+main ()
+{
+  asm volatile ("" : : : "memory");
+  if (foo (0) != 0)
+    __builtin_abort ();
+  return 0;
+}

        Jakub