[PATCH] Fix num_imm_uses (PR tree-optimization/70405)

[Jakub Jelinek]

Hi!

The recent change to num_imm_uses (to add support for NULL USE_STMT)
broke it totally, fortunately we have just one user of this function
right now.  I've filed a PR for GCC 7 so that we get a warning on this.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux, ok for
trunk?

2016-03-29  Jakub Jelinek  <ja...@redhat.com>

        PR tree-optimization/70405
        * ssa-iterators.h (num_imm_uses): Add missing braces.

        * gcc.dg/pr70405.c: New test.

--- gcc/ssa-iterators.h.jj      2016-01-04 14:55:53.000000000 +0100
+++ gcc/ssa-iterators.h 2016-03-29 14:31:16.773551024 +0200
@@ -448,9 +448,11 @@ num_imm_uses (const_tree var)
   unsigned int num = 0;
 
   if (!MAY_HAVE_DEBUG_STMTS)
-    for (ptr = start->next; ptr != start; ptr = ptr->next)
-      if (USE_STMT (ptr))
-       num++;
+    {
+      for (ptr = start->next; ptr != start; ptr = ptr->next)
+       if (USE_STMT (ptr))
+         num++;
+    }
   else
     for (ptr = start->next; ptr != start; ptr = ptr->next)
       if (USE_STMT (ptr) && !is_gimple_debug (USE_STMT (ptr)))
--- gcc/testsuite/gcc.dg/pr70405.c.jj   2016-03-29 14:49:18.252808104 +0200
+++ gcc/testsuite/gcc.dg/pr70405.c      2016-03-29 14:33:41.000000000 +0200
@@ -0,0 +1,15 @@
+/* PR tree-optimization/70405 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcompare-debug" } */
+/* { dg-additional-options "-mavx512f" { target i?86-*-* x86_64-*-* } } */
+
+typedef short V __attribute__ ((vector_size (32)));
+
+int
+foo (V *p)
+{
+  V v = *p;
+  v >>= v;
+  v -= v[0];
+  return v[3];
+}

        Jakub