MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.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 ;   SetMem32.asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem32 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     .code
  25
  26 InternalMemSetMem32 PROC    USES    rdi
  27     DB      49h, 0fh, 6eh, 0c0h        ;  movq    mm0, r8       ; mm0 <- Value
  28     mov     rax, rcx                                            ; rax <- Buffer
  29     mov     rdi, rax
  30     mov     rcx, rdx
  31     shr     rcx, 1
  32     jz      @SetDwords
  33     DB      0fh, 70h, 0C0h, 44h        ;  pshufw  mm0, mm0, 44h
  34 @@:
  35     DB      48h, 0fh, 0e7h, 07h        ;  movntq  [rdi], mm0
  36     add     rdi, 8
  37     loop    @B
  38     mfence
  39 @SetDwords:
  40     test    dl, 1
  41     jz      @F
  42     DB      0fh, 7eh, 07h              ;  movd    [rdi], mm0
  43 @@:
  44     ret
  45 InternalMemSetMem32 ENDP
  46
  47     END