MdePkg/Library/BaseMemoryLibSse2/Ia32/SetMem16.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, 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     SECTION .text
  19
  20 ;------------------------------------------------------------------------------
  21 ;  VOID *
  22 ;  EFIAPI
  23 ;  InternalMemSetMem16 (
  24 ;    IN VOID   *Buffer,
  25 ;    IN UINTN  Count,
  26 ;    IN UINT16 Value
  27 ;    );
  28 ;------------------------------------------------------------------------------
  29 global ASM_PFX(InternalMemSetMem16)
  30 ASM_PFX(InternalMemSetMem16):
  31     push    edi
  32     mov     edx, [esp + 12]
  33     mov     edi, [esp + 8]
  34     xor     ecx, ecx
  35     sub     ecx, edi
  36     and     ecx, 15                     ; ecx + edi aligns on 16-byte boundary
  37     mov     eax, [esp + 16]
  38     jz      .0
  39     shr     ecx, 1
  40     cmp     ecx, edx
  41     cmova   ecx, edx
  42     sub     edx, ecx
  43     rep     stosw
  44 .0:
  45     mov     ecx, edx
  46     and     edx, 7
  47     shr     ecx, 3
  48     jz      @SetWords
  49     movd    xmm0, eax
  50     pshuflw xmm0, xmm0, 0
  51     movlhps xmm0, xmm0
  52 .1:
  53     movntdq [edi], xmm0                 ; edi should be 16-byte aligned
  54     add     edi, 16
  55     loop    .1
  56     mfence
  57 @SetWords:
  58     mov     ecx, edx
  59     rep     stosw
  60     mov     eax, [esp + 8]
  61     pop     edi
  62     ret
  63