From 9e5bbff51d5f2c305a3bac04d4daf3a9ed319d32 Mon Sep 17 00:00:00 2001
From: Aleksey Shipilev <shade@openjdk.org>
Date: Thu, 29 Oct 2020 14:19:56 +0000
Subject: [PATCH] 8255550: x86: Assembler::cmpq(Address dst, Register src)
 encoding is incorrect

Reviewed-by: kvn, eosterlund
---
 src/hotspot/cpu/x86/assembler_x86.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hotspot/cpu/x86/assembler_x86.cpp b/src/hotspot/cpu/x86/assembler_x86.cpp
index 1f6b196d3ce..3933bac000f 100644
--- a/src/hotspot/cpu/x86/assembler_x86.cpp
+++ b/src/hotspot/cpu/x86/assembler_x86.cpp
@@ -9803,7 +9803,7 @@ void Assembler::cmpq(Register dst, int32_t imm32) {
 
 void Assembler::cmpq(Address dst, Register src) {
   InstructionMark im(this);
-  emit_int16(get_prefixq(dst, src), 0x3B);
+  emit_int16(get_prefixq(dst, src), 0x39);
   emit_operand(src, dst);
 }