MdePkg/Library/BaseMemoryLibRepStr/x64/ScanMem64.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation
   4 ; All rights reserved. This program and the accompanying materials
   5 ; are licensed and made available under the terms and conditions of the BSD License
   6 ; which accompanies this distribution.  The full text of the license may be found at
   7 ; http://opensource.org/licenses/bsd-license.php
   8 ;
   9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 ;
  12 ; Module Name:
  13 ;
  14 ;   ScanMem64.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   ScanMem64 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;   The following BaseMemoryLib instances share the same version of this file:
  23 ;
  24 ;       BaseMemoryLibRepStr
  25 ;       BaseMemoryLibMmx
  26 ;       BaseMemoryLibSse2
  27 ;
  28 ;------------------------------------------------------------------------------
  29
  30     .code
  31
  32 InternalMemScanMem64    PROC    USES    rdi
  33     mov     rdi, rcx
  34     mov     rax, r8
  35     mov     rcx, rdx
  36     repne   scasq
  37     lea     rax, [rdi - 8]
  38     cmovnz  rax, rcx
  39     ret
  40 InternalMemScanMem64    ENDP
  41
  42     END