--- a/gcc/config/rs6000/rs6000-modes.def	Thu Oct 25 07:37:49 2018 +0900
+++ b/gcc/config/rs6000/rs6000-modes.def	Thu Feb 13 11:34:05 2020 +0900
@@ -1,5 +1,5 @@
 /* Definitions of target machine for GNU compiler, for IBM RS/6000.
-   Copyright (C) 2002-2018 Free Software Foundation, Inc.
+   Copyright (C) 2002-2020 Free Software Foundation, Inc.
    Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
 
    This file is part of GCC.
@@ -74,6 +74,10 @@
 VECTOR_MODES (INT, 32);       /* V32QI V16HI V8SI V4DI */
 VECTOR_MODES (FLOAT, 32);     /*       V16HF V8SF V4DF */
 
+/* Half VMX/VSX vector (for internal use)  */
+VECTOR_MODE (FLOAT, SF, 2);   /*                 V2SF  */
+VECTOR_MODE (INT, SI, 2);     /*                 V2SI  */
+
 /* Replacement for TImode that only is allowed in GPRs.  We also use PTImode
    for quad memory atomic operations to force getting an even/odd register
    combination.  */