[PATCH, PR68286] Fix vector comparison expand

[Ilya Enkovich]

Hi,

My vector comparison patches broken expand of vector comparison on targets 
which don't have new comparison patterns but support VEC_COND_EXPR.  This 
happens because it's not checked vector comparison may be expanded as a 
comparison.  This patch fixes it.  Bootstrapped and regtested on 
powerpc64le-unknown-linux-gnu.  OK for trunk?

Thanks,
Ilya
--
gcc/

2015-11-12  Ilya Enkovich  <enkovich....@gmail.com>

        * expr.c (do_store_flag): Expand vector comparison as
        VEC_COND_EXPR if vector comparison is not supported
        by target.

gcc/testsuite/

2015-11-12  Ilya Enkovich  <enkovich....@gmail.com>

        * gcc.dg/pr68286.c: New test.


diff --git a/gcc/expr.c b/gcc/expr.c
index 03936ee..bd43dc4 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -11128,7 +11128,8 @@ do_store_flag (sepops ops, rtx target, machine_mode 
mode)
   if (TREE_CODE (ops->type) == VECTOR_TYPE)
     {
       tree ifexp = build2 (ops->code, ops->type, arg0, arg1);
-      if (VECTOR_BOOLEAN_TYPE_P (ops->type))
+      if (VECTOR_BOOLEAN_TYPE_P (ops->type)
+         && expand_vec_cmp_expr_p (TREE_TYPE (arg0), ops->type))
        return expand_vec_cmp_expr (ops->type, ifexp, target);
       else
        {
diff --git a/gcc/testsuite/gcc.dg/pr68286.c b/gcc/testsuite/gcc.dg/pr68286.c
new file mode 100644
index 0000000..d0392e8
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr68286.c
@@ -0,0 +1,17 @@
+/* PR target/68286 */
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+int a, b, c;
+int fn1 ()
+{
+  int d[] = {0};
+  for (; c; c++)
+    {
+      float e = c;
+      if (e)
+        d[0]++;
+    }
+  b = d[0];
+  return a;
+}