MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.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 ;   SetMem.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 InternalMemSetMem   PROC    USES    rdi
  27     mov     rax, r8
  28     mov     ah, al
  29     DB      48h, 0fh, 6eh, 0c0h        ;  movq    mm0, rax
  30     mov     r8, rcx
  31     mov     rdi, r8
  32     mov     rcx, rdx
  33     shr     rcx, 3
  34     jz      @SetBytes
  35     DB      0fh, 70h, 0C0h, 00h        ;  pshufw  mm0, mm0, 0h
  36 @@:
  37     DB      48h, 0fh, 0e7h, 07h        ;  movntq  [rdi], mm0
  38     add     rdi, 8
  39     loop    @B
  40     mfence
  41 @SetBytes:
  42     and     rdx, 7
  43     mov     rcx, rdx
  44     rep     stosb
  45     mov     rax, r8
  46     ret
  47 InternalMemSetMem   ENDP
  48
  49     END