--- a/hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Fri Sep 11 16:11:07 2015 +0300
+++ b/hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Fri Sep 11 17:02:44 2015 -0700
@@ -269,12 +269,16 @@
       __ kmovql(k1, rbx);
     }
 #ifdef _WIN64
+    int last_reg = 15;
     if (UseAVX > 2) {
-      for (int i = 6; i <= 31; i++) {
-        __ movdqu(xmm_save(i), as_XMMRegister(i));
+      last_reg = 31;
+    }
+    if (VM_Version::supports_avx512novl()) {
+      for (int i = xmm_save_first; i <= last_reg; i++) {
+        __ vextractf32x4h(xmm_save(i), as_XMMRegister(i), 0);
       }
     } else {
-      for (int i = 6; i <= 15; i++) {
+      for (int i = xmm_save_first; i <= last_reg; i++) {
         __ movdqu(xmm_save(i), as_XMMRegister(i));
       }
     }
@@ -386,13 +390,15 @@
 
     // restore regs belonging to calling function
 #ifdef _WIN64
-    int xmm_ub = 15;
-    if (UseAVX > 2) {
-      xmm_ub = 31;
-    }
     // emit the restores for xmm regs
-    for (int i = 6; i <= xmm_ub; i++) {
-      __ movdqu(as_XMMRegister(i), xmm_save(i));
+    if (VM_Version::supports_avx512novl()) {
+      for (int i = xmm_save_first; i <= last_reg; i++) {
+        __ vinsertf32x4h(as_XMMRegister(i), xmm_save(i), 0);
+      }
+    } else {
+      for (int i = xmm_save_first; i <= last_reg; i++) {
+        __ movdqu(as_XMMRegister(i), xmm_save(i));
+      }
     }
 #endif
     __ movptr(r15, r15_save);
@@ -1342,11 +1348,15 @@
     __ align(OptoLoopAlignment);
     if (UseUnalignedLoadStores) {
       Label L_end;
+      if (UseAVX > 2) {
+        __ movl(to, 0xffff);
+        __ kmovql(k1, to);
+      }
       // Copy 64-bytes per iteration
       __ BIND(L_loop);
       if (UseAVX > 2) {
-        __ evmovdqu(xmm0, Address(end_from, qword_count, Address::times_8, -56), Assembler::AVX_512bit);
-        __ evmovdqu(Address(end_to, qword_count, Address::times_8, -56), xmm0, Assembler::AVX_512bit);
+        __ evmovdqul(xmm0, Address(end_from, qword_count, Address::times_8, -56), Assembler::AVX_512bit);
+        __ evmovdqul(Address(end_to, qword_count, Address::times_8, -56), xmm0, Assembler::AVX_512bit);
       } else if (UseAVX == 2) {
         __ vmovdqu(xmm0, Address(end_from, qword_count, Address::times_8, -56));
         __ vmovdqu(Address(end_to, qword_count, Address::times_8, -56), xmm0);
@@ -1422,11 +1432,15 @@
     __ align(OptoLoopAlignment);
     if (UseUnalignedLoadStores) {
       Label L_end;
+      if (UseAVX > 2) {
+        __ movl(to, 0xffff);
+        __ kmovql(k1, to);
+      }
       // Copy 64-bytes per iteration
       __ BIND(L_loop);
       if (UseAVX > 2) {
-        __ evmovdqu(xmm0, Address(from, qword_count, Address::times_8, 32), Assembler::AVX_512bit);
-        __ evmovdqu(Address(dest, qword_count, Address::times_8, 32), xmm0, Assembler::AVX_512bit);
+        __ evmovdqul(xmm0, Address(from, qword_count, Address::times_8, 32), Assembler::AVX_512bit);
+        __ evmovdqul(Address(dest, qword_count, Address::times_8, 32), xmm0, Assembler::AVX_512bit);
       } else if (UseAVX == 2) {
         __ vmovdqu(xmm0, Address(from, qword_count, Address::times_8, 32));
         __ vmovdqu(Address(dest, qword_count, Address::times_8, 32), xmm0);
@@ -3106,6 +3120,14 @@
 
     __ 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(rax, 0xffff);
+      __ kmovql(k1, rax);
+    }
+
     // keylen could be only {11, 13, 15} * 4 = {44, 52, 60}
     __ movl(keylen, Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)));
 
@@ -3200,6 +3222,14 @@
 
     __ 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(rax, 0xffff);
+      __ kmovql(k1, rax);
+    }
+
     // keylen could be only {11, 13, 15} * 4 = {44, 52, 60}
     __ movl(keylen, Address(key, arrayOopDesc::length_offset_in_bytes() - arrayOopDesc::base_offset_in_bytes(T_INT)));
 
@@ -3312,6 +3342,14 @@
 
     __ 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(rax, 0xffff);
+      __ kmovql(k1, rax);
+    }
+
 #ifdef _WIN64
     // on win64, fill len_reg from stack position
     __ movl(len_reg, len_mem);
@@ -3508,6 +3546,14 @@
 
     __ 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(rax, 0xffff);
+      __ kmovql(k1, rax);
+    }
+
 #ifdef _WIN64
     // on win64, fill len_reg from stack position
     __ movl(len_reg, len_mem);
@@ -3746,6 +3792,14 @@
 
     __ enter();
 
+    // 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(rax, 0xffff);
+      __ kmovql(k1, rax);
+    }
+
 #ifdef _WIN64
     // save the xmm registers which must be preserved 6-10
     __ subptr(rsp, -rsp_after_call_off * wordSize);