--- a/hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Wed Apr 15 14:51:56 2015 +0200
+++ b/hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Fri Apr 17 17:39:19 2015 -0700
@@ -835,7 +835,8 @@
 
     if (UseUnalignedLoadStores && (UseAVX >= 2)) {
       // clean upper bits of YMM registers
-      __ vzeroupper();
+      __ vpxor(xmm0, xmm0);
+      __ vpxor(xmm1, xmm1);
     }
     __ addl(qword_count, 8);
     __ jccb(Assembler::zero, L_exit);