ArmPkg/ArmDisassemblerLib: fix check for MSR instruction

[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibOptPei / X64 / CompareMem.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
; This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php.\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;\r
; Module Name:\r
;\r
;   CompareMem.Asm\r
;\r
; Abstract:\r
;\r
;   CompareMem function\r
;\r
; Notes:\r
;\r
;   The following BaseMemoryLib instances contain the same copy of this file:\r
;\r
;       BaseMemoryLibRepStr\r
;       BaseMemoryLibMmx\r
;       BaseMemoryLibSse2\r
;       BaseMemoryLibOptDxe\r
;       BaseMemoryLibOptPei\r
;\r
;------------------------------------------------------------------------------\r
\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; INTN\r
; EFIAPI\r
; InternalMemCompareMem (\r
;   IN      CONST VOID                *DestinationBuffer,\r
;   IN      CONST VOID                *SourceBuffer,\r
;   IN      UINTN                     Length\r
;   );\r
;------------------------------------------------------------------------------\r
InternalMemCompareMem   PROC    USES    rsi rdi\r
    mov     rsi, rcx\r
    mov     rdi, rdx\r
    mov     rcx, r8\r
    repe    cmpsb\r
    movzx   rax, byte ptr [rsi - 1]\r
    movzx   rdx, byte ptr [rdi - 1]\r
    sub     rax, rdx\r
    ret\r
InternalMemCompareMem   ENDP\r
\r
    END\r