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path: root/MdePkg/Library/BaseMemoryLibOptPei/X64/ScanMem64.nasm
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;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
; 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
; http://opensource.org/licenses/bsd-license.php.
;
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;
; Module Name:
;
;   ScanMem64.Asm
;
; Abstract:
;
;   ScanMem64 function
;
; Notes:
;
;   The following BaseMemoryLib instances contain the same copy of this file:
;
;       BaseMemoryLibRepStr
;       BaseMemoryLibMmx
;       BaseMemoryLibSse2
;       BaseMemoryLibOptDxe
;       BaseMemoryLibOptPei
;
;------------------------------------------------------------------------------

    DEFAULT REL
    SECTION .text

;------------------------------------------------------------------------------
; CONST VOID *
; EFIAPI
; InternalMemScanMem64 (
;   IN      CONST VOID                *Buffer,
;   IN      UINTN                     Length,
;   IN      UINT64                    Value
;   );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemScanMem64)
ASM_PFX(InternalMemScanMem64):
    push    rdi
    mov     rdi, rcx
    mov     rax, r8
    mov     rcx, rdx
    repne   scasq
    lea     rax, [rdi - 8]
    cmovnz  rax, rcx
    pop     rdi
    ret