1 files changed, 12 insertions, 13 deletions
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.S b/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.S
index c207db7dda..4f73686f30 100644
--- a/MdePkg/Library/BaseMemoryLibOptDxe/X64/CompareMem.S
+++ b/MdePkg/Library/BaseMemoryLibOptDxe/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
@@ -41,20 +41,19 @@
 #   IN      CONST VOID                *SourceBuffer,
 #   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
+    sub     %dl, %al
+    popq    %rdi
+    popq    %rsi
     ret