diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b23481f457e..7f9dd0e2ed2 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2016-12-01  Kelvin Nilsen  <kelvin@gcc.gnu.org>
+
+	PR target/78577
+	* config/rs6000/vsx.md (vextuhlx): Revise mode of operand 2.
+	(vextuhrx): Likewise.
+	(vextuwlx): Likewise.
+	(vextuwrx): Likewise.
+
 2016-12-01  David Malcolm  <dmalcolm@redhat.com>
 
 	* dwarf2out.c (dwarf2out_c_finalize): Reset early_dwarf and
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index 01d275d168e..1801bc05906 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -3648,7 +3648,7 @@
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(unspec:SI
 	 [(match_operand:SI 1 "register_operand" "r")
-	  (match_operand:V16QI 2 "altivec_register_operand" "v")]
+	  (match_operand:V8HI 2 "altivec_register_operand" "v")]
 	 UNSPEC_VEXTUHLX))]
   "TARGET_P9_VECTOR"
   "vextuhlx %0,%1,%2"
@@ -3659,7 +3659,7 @@
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(unspec:SI
 	 [(match_operand:SI 1 "register_operand" "r")
-	  (match_operand:V16QI 2 "altivec_register_operand" "v")]
+	  (match_operand:V8HI 2 "altivec_register_operand" "v")]
 	 UNSPEC_VEXTUHRX))]
   "TARGET_P9_VECTOR"
   "vextuhrx %0,%1,%2"
@@ -3670,7 +3670,7 @@
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(unspec:SI
 	 [(match_operand:SI 1 "register_operand" "r")
-	  (match_operand:V16QI 2 "altivec_register_operand" "v")]
+	  (match_operand:V4SI 2 "altivec_register_operand" "v")]
 	 UNSPEC_VEXTUWLX))]
   "TARGET_P9_VECTOR"
   "vextuwlx %0,%1,%2"
@@ -3681,7 +3681,7 @@
   [(set (match_operand:SI 0 "register_operand" "=r")
 	(unspec:SI
 	 [(match_operand:SI 1 "register_operand" "r")
-	  (match_operand:V16QI 2 "altivec_register_operand" "v")]
+	  (match_operand:V4SI 2 "altivec_register_operand" "v")]
 	 UNSPEC_VEXTUWRX))]
   "TARGET_P9_VECTOR"
   "vextuwrx %0,%1,%2"