MdePkg/Library/BaseMemoryLibMmx/X64/SetMem16.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006 - 2022, Intel Corporation. All rights reserved.<BR>
   4 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   5 ;
   6 ; Module Name:
   7 ;
   8 ;   SetMem16.nasm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   SetMem16 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     DEFAULT REL
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ; VOID *
  23 ; EFIAPI
  24 ; InternalMemSetMem16 (
  25 ;   OUT     VOID                      *Buffer,
  26 ;   IN      UINTN                     Length,
  27 ;   IN      UINT16                    Value
  28 ;   );
  29 ;------------------------------------------------------------------------------
  30 global ASM_PFX(InternalMemSetMem16)
  31 ASM_PFX(InternalMemSetMem16):
  32     push    rdi
  33     mov     rax, r8
  34     movq    mm0, rax
  35     mov     r8, rcx
  36     mov     rdi, r8
  37     mov     rcx, rdx
  38     and     edx, 3
  39     shr     rcx, 2
  40     jz      @SetWords
  41     pshufw  mm0, mm0, 0
  42 .0:
  43     movntq  [rdi], mm0
  44     add     rdi, 8
  45     loop    .0
  46     mfence
  47 @SetWords:
  48     mov     ecx, edx
  49     rep     stosw
  50     mov     rax, r8
  51     pop     rdi
  52     ret
  53