From 525b20fce0acd393f31fd37fe1f05f9d32577f77 Mon Sep 17 00:00:00 2001
From: Aleksey Shipilev <shade@openjdk.org>
Date: Wed, 12 Jan 2022 08:32:08 +0000
Subject: [PATCH] 8279676: Dubious YMM register clearing in x86_64 arraycopy
 stubs

Reviewed-by: kvn, vlivanov, neliasso
---
 src/hotspot/cpu/x86/stubGenerator_x86_64.cpp | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp b/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp
index 8e6257cb786..8b7188ca42c 100644
--- a/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp
+++ b/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp
@@ -1221,11 +1221,6 @@ class StubGenerator: public StubCodeGenerator {
       }
       __ addptr(qword_count, 4);
       __ BIND(L_end);
-      if (UseAVX >= 2) {
-        // clean upper bits of YMM registers
-        __ vpxor(xmm0, xmm0);
-        __ vpxor(xmm1, xmm1);
-      }
     } else {
       // Copy 32-bytes per iteration
       __ BIND(L_loop);
@@ -1299,11 +1294,6 @@ class StubGenerator: public StubCodeGenerator {
       }
       __ subptr(qword_count, 4);
       __ BIND(L_end);
-      if (UseAVX >= 2) {
-        // clean upper bits of YMM registers
-        __ vpxor(xmm0, xmm0);
-        __ vpxor(xmm1, xmm1);
-      }
     } else {
       // Copy 32-bytes per iteration
       __ BIND(L_loop);