--- a/hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Fri Sep 11 16:11:07 2015 +0300
+++ b/hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp	Fri Sep 11 17:02:44 2015 -0700
@@ -795,6 +795,12 @@
   void xmm_copy_forward(Register from, Register to_from, Register qword_count) {
     assert( UseSSE >= 2, "supported cpu only" );
     Label L_copy_64_bytes_loop, L_copy_64_bytes, L_copy_8_bytes, L_exit;
+    if (UseAVX > 2) {
+      __ push(rbx);
+      __ movl(rbx, 0xffff);
+      __ kmovdl(k1, rbx);
+      __ pop(rbx);
+    }
     // Copy 64-byte chunks
     __ jmpb(L_copy_64_bytes);
     __ align(OptoLoopAlignment);
@@ -802,8 +808,8 @@
 
     if (UseUnalignedLoadStores) {
       if (UseAVX > 2) {
-        __ evmovdqu(xmm0, Address(from, 0), Assembler::AVX_512bit);
-        __ evmovdqu(Address(from, to_from, Address::times_1, 0), xmm0, Assembler::AVX_512bit);
+        __ evmovdqul(xmm0, Address(from, 0), Assembler::AVX_512bit);
+        __ evmovdqul(Address(from, to_from, Address::times_1, 0), xmm0, Assembler::AVX_512bit);
       } else if (UseAVX == 2) {
         __ vmovdqu(xmm0, Address(from,  0));
         __ vmovdqu(Address(from, to_from, Address::times_1,  0), xmm0);
@@ -2217,6 +2223,15 @@
     const XMMRegister xmm_temp4  = xmm5;
 
     __ enter();   // required for proper stackwalking of RuntimeStub frame
+
+    // For EVEX with VL and BW, provide a standard mask, VL = 128 will guide the merge
+    // context for the registers used, where all instructions below are using 128-bit mode
+    // On EVEX without VL and BW, these instructions will all be AVX.
+    if (VM_Version::supports_avx512vlbw()) {
+      __ movl(rdx, 0xffff);
+      __ kmovdl(k1, rdx);
+    }
+
     __ movptr(from, from_param);
     __ movptr(key, key_param);
 
@@ -2315,6 +2330,15 @@
     const XMMRegister xmm_temp4  = xmm5;
 
     __ enter(); // required for proper stackwalking of RuntimeStub frame
+
+    // For EVEX with VL and BW, provide a standard mask, VL = 128 will guide the merge
+    // context for the registers used, where all instructions below are using 128-bit mode
+    // On EVEX without VL and BW, these instructions will all be AVX.
+    if (VM_Version::supports_avx512vlbw()) {
+      __ movl(rdx, 0xffff);
+      __ kmovdl(k1, rdx);
+    }
+
     __ movptr(from, from_param);
     __ movptr(key, key_param);
 
@@ -2441,6 +2465,14 @@
     __ enter(); // required for proper stackwalking of RuntimeStub frame
     handleSOERegisters(true /*saving*/);
 
+    // For EVEX with VL and BW, provide a standard mask, VL = 128 will guide the merge
+    // context for the registers used, where all instructions below are using 128-bit mode
+    // On EVEX without VL and BW, these instructions will all be AVX.
+    if (VM_Version::supports_avx512vlbw()) {
+      __ movl(rdx, 0xffff);
+      __ kmovdl(k1, rdx);
+    }
+
     // load registers from incoming parameters
     const Address  from_param(rbp, 8+0);
     const Address  to_param  (rbp, 8+4);
@@ -2602,6 +2634,14 @@
     __ enter(); // required for proper stackwalking of RuntimeStub frame
     handleSOERegisters(true /*saving*/);
 
+    // For EVEX with VL and BW, provide a standard mask, VL = 128 will guide the merge
+    // context for the registers used, where all instructions below are using 128-bit mode
+    // On EVEX without VL and BW, these instructions will all be AVX.
+    if (VM_Version::supports_avx512vlbw()) {
+      __ movl(rdx, 0xffff);
+      __ kmovdl(k1, rdx);
+    }
+
     // load registers from incoming parameters
     const Address  from_param(rbp, 8+0);
     const Address  to_param  (rbp, 8+4);
@@ -2782,6 +2822,14 @@
     __ enter();
     handleSOERegisters(true);  // Save registers
 
+    // For EVEX with VL and BW, provide a standard mask, VL = 128 will guide the merge
+    // context for the registers used, where all instructions below are using 128-bit mode
+    // On EVEX without VL and BW, these instructions will all be AVX.
+    if (VM_Version::supports_avx512vlbw()) {
+      __ movl(rdx, 0xffff);
+      __ kmovdl(k1, rdx);
+    }
+
     __ movptr(state, state_param);
     __ movptr(subkeyH, subkeyH_param);
     __ movptr(data, data_param);