re PR tree-optimization/61917 (ICE on valid code at -O3 on x86_64-linux-gnu in…

re PR tree-optimization/61917 (ICE on valid code at -O3 on x86_64-linux-gnu in vectorizable_reduction, at tree-vect-loop.c:4913)

	PR tree-optimization/61917
	* tree-vect-loop.c (vectorizable_reduction): Handle obvious case
	that reduc_def_stmt is null.

From-SVN: r220987

gcc/ChangeLog

+2015-02-25  Kai Tietz  <ktietz@redhat.com>
+
+	PR tree-optimization/61917
+	* tree-vect-loop.c (vectorizable_reduction): Handle obvious case
+	that reduc_def_stmt is null.
+
 2015-02-25  Martin Liska  <mliska@suse.cz>
 
 	* ipa-icf-gimple.c (func_checker::compare_variable_decl): Compare

gcc/tree-vect-loop.c

@@ -4984,7 +4984,7 @@ vectorizable_reduction (gimple stmt, gimple_stmt_iterator *gsi,
   if (!found_nested_cycle_def)
     reduc_def_stmt = def_stmt;
 
-  if (gimple_code (reduc_def_stmt) != GIMPLE_PHI)
+  if (reduc_def_stmt && gimple_code (reduc_def_stmt) != GIMPLE_PHI)
     return false;
 
   if (!(dt == vect_reduction_def