[patch]: [Bug tree-optimization/61917] [4.9/5 Regression] ICE on valid code at -O3 on x86_64-linux-gnu in vectorizable_reduction, at tree-vect-loop.c:4913

[Kai Tietz <ktietz70 at googlemail dot com>]

Hello,

ChangeLog

2015-02-25  Kai Tietz  <ktietz@redhat.com>

    PR tree-optimization/61917
    * tree-vect-loop.c (vectorizable_reduction): Allow
    vect_internal_def without reduction to exit graceful.

ChagneLog testsuite/

2015-02-25  Kai Tietz  <ktietz@redhat.com>

    PR tree-optimization/61917
    * gcc.dg/vect/vect-pr61917.c: New file.

Tested for x86_64-unkown-linux.  Ok for apply?
Regards,
Kai

Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c    (Revision 220958)
+++ tree-vect-loop.c    (Arbeitskopie)
@@ -4990,7 +4990,7 @@ vectorizable_reduction (gimple stmt, gimple_stmt_i
       /* For pattern recognized stmts, orig_stmt might be a reduction,
      but some helper statements for the pattern might not, or
      might be COND_EXPRs with reduction uses in the condition.  */
-      gcc_assert (orig_stmt);
+      gcc_assert (orig_stmt || dt == vect_internal_def);
       return false;
     }
   if (!found_nested_cycle_def)
Index: gcc/gcc/testsuite/gcc.dg/vect/vect-pr61917.c
===================================================================
--- /dev/null
+++ gcc/gcc/testsuite/gcc.dg/vect/vect-pr61917.c
@@ -0,0 +1,13 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3" } */
+
+int a, b, c, d;
+
+int
+fn1 ()
+{
+  for (; c; c++)
+    for (b = 0; b < 2; b++)
+      d = a - d;
+  return d;
+}