re PR tree-optimization/80844 (OpenMP SIMD doesn't know how to efficiently zero…

re PR tree-optimization/80844 (OpenMP SIMD doesn't know how to efficiently zero a vector (its stores zeros and reloads))

2017-05-26  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/80844
	* tree-vectorizer.c (adjust_simduid_builtins): Propagate
	results.

From-SVN: r248481

gcc/ChangeLog

+2017-05-26  Richard Biener  <rguenther@suse.de>
+
+	PR tree-optimization/80844
+	* tree-vectorizer.c (adjust_simduid_builtins): Propagate
+	results.
+
 2017-05-25  Sebastian Peryt  <sebastian.peryt@intel.com>
 
 	* doc/md.texi (Machine Constraints): Update x86 family

gcc/tree-vectorizer.c

@@ -229,8 +229,11 @@ adjust_simduid_builtins (hash_table<simduid_to_vf> *htab)
 	    default:
 	      gcc_unreachable ();
 	    }
-	  update_call_from_tree (&i, t);
-	  gsi_next (&i);
+	  tree lhs = gimple_call_lhs (stmt);
+	  if (lhs)
+	    replace_uses_by (lhs, t);
+	  release_defs (stmt);
+	  gsi_remove (&i, true);
 	}
     }
 }