diff -r 43d0179ee9de -r 964d24a82077 hotspot/src/cpu/aarch64/vm/assembler_aarch64.hpp
--- a/hotspot/src/cpu/aarch64/vm/assembler_aarch64.hpp	Wed Jul 05 20:38:50 2017 +0200
+++ b/hotspot/src/cpu/aarch64/vm/assembler_aarch64.hpp	Tue Jun 23 18:56:17 2015 +0000
@@ -491,6 +491,11 @@
         i->rf(_index, 16);
         i->f(_ext.option(), 15, 13);
         unsigned size = i->get(31, 30);
+        if (i->get(26, 26) && i->get(23, 23)) {
+          // SIMD Q Type - Size = 128 bits
+          assert(size == 0, "bad size");
+          size = 0b100;
+        }
         if (size == 0) // It's a byte
           i->f(_ext.shift() >= 0, 12);
         else {