Index: gcc/config/rs6000/rs6000.c
===================================================================
--- gcc/config/rs6000/rs6000.c	(revision 195825)
+++ gcc/config/rs6000/rs6000.c	(working copy)
@@ -3699,7 +3699,8 @@ rs6000_builtin_vectorized_libmass (tree 
 	  bdecl = builtin_decl_implicit (fn);
 	  suffix = "d2";				/* pow -> powd2 */
 	  if (el_mode != DFmode
-	      || n != 2)
+	      || n != 2
+	      || !bdecl)
 	    return NULL_TREE;
 	  break;
 
@@ -3736,7 +3737,8 @@ rs6000_builtin_vectorized_libmass (tree 
 	  bdecl = builtin_decl_implicit (fn);
 	  suffix = "4";					/* powf -> powf4 */
 	  if (el_mode != SFmode
-	      || n != 4)
+	      || n != 4
+	      || !bdecl)
 	    return NULL_TREE;
 	  break;
 
@@ -3749,6 +3751,9 @@ rs6000_builtin_vectorized_libmass (tree 
 
   gcc_assert (suffix != NULL);
   bname = IDENTIFIER_POINTER (DECL_NAME (bdecl));
+  if (!bname)
+    return NULL_TREE;
+
   strcpy (name, bname + sizeof ("__builtin_") - 1);
   strcat (name, suffix);
 
Index: gcc/testsuite/gcc.target/powerpc/vsx-mass-1.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/vsx-mass-1.c	(revision 195825)
+++ gcc/testsuite/gcc.target/powerpc/vsx-mass-1.c	(working copy)
@@ -1,4 +1,4 @@
-/* { dg-do compile { target { powerpc*-*-* } } } */
+/* { dg-do compile { target { powerpc*-*-linux* } } } */
 /* { dg-skip-if "" { powerpc*-*-darwin* } { "*" } { "" } } */
 /* { dg-require-effective-target powerpc_vsx_ok } */
 /* { dg-options "-O3 -ftree-vectorize -mcpu=power7 -ffast-math -mveclibabi=mass" } */