MdePkg/Library/BaseMemoryLibSse2/X64/SetMem64.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 ;   SetMem64.nasm
   9 ;
  10 ; Abstract:
  11 ;
  12 ;   SetMem64 function
  13 ;
  14 ; Notes:
  15 ;
  16 ;------------------------------------------------------------------------------
  17
  18     DEFAULT REL
  19     SECTION .text
  20
  21 ;------------------------------------------------------------------------------
  22 ;  VOID *
  23 ;  InternalMemSetMem64 (
  24 ;    IN VOID   *Buffer,
  25 ;    IN UINTN  Count,
  26 ;    IN UINT64 Value
  27 ;    )
  28 ;------------------------------------------------------------------------------
  29 global ASM_PFX(InternalMemSetMem64)
  30 ASM_PFX(InternalMemSetMem64):
  31     mov     rax, rcx                    ; rax <- Buffer
  32     xchg    rcx, rdx                    ; rcx <- Count & rdx <- Buffer
  33     test    dl, 8
  34     movq    xmm0, r8
  35     jz      .0
  36     mov     [rdx], r8
  37     add     rdx, 8
  38     dec     rcx
  39 .0:
  40     shr     rcx, 1
  41     jz      @SetQwords
  42     movlhps xmm0, xmm0
  43 .1:
  44     movntdq [rdx], xmm0
  45     lea     rdx, [rdx + 16]
  46     loop    .1
  47     mfence
  48 @SetQwords:
  49     jnc     .2
  50     mov     [rdx], r8
  51 .2:
  52     ret
  53