1 files changed, 11 insertions, 12 deletions
diff --git a/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.S b/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.S
index c207db7dda..bdae174140 100644
--- a/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.S
+++ b/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.S
@@ -3,7 +3,7 @@
 #
 #------------------------------------------------------------------------------
 #
-# Copyright (c) 2006 - 2008, Intel Corporation
+# Copyright (c) 2006 - 2009, Intel Corporation
 # All rights reserved. This program and the accompanying materials
 # are licensed and made available under the terms and conditions of the BSD License
 # which accompanies this distribution.  The full text of the license may be found at
@@ -42,19 +42,18 @@
 #   IN      UINTN                     Length
 #   );
 #------------------------------------------------------------------------------
-.intel_syntax noprefix
 ASM_GLOBAL ASM_PFX(InternalMemCompareMem)
 ASM_PFX(InternalMemCompareMem):
-    push    rsi
-    push    rdi
-    mov     rsi, rcx
-    mov     rdi, rdx
-    mov     rcx, r8
+    pushq   %rsi
+    pushq   %rdi
+    movq    %rcx, %rsi
+    movq    %rdx, %rdi
+    movq    %r8, %rcx
     repe    cmpsb
-    movzx   rax, byte ptr [rsi - 1]
-    movzx   rdx, byte ptr [rdi - 1]
-    sub     rax, rdx
-    pop     rdi
-    pop     rsi
+    movzbq  -1(%rsi) , %rax
+    movzbq  -1(%rdi) , %rdx
+    subq    %rdx, %rax
+    popq    %rdi
+    popq    %rsi
     ret