MdePkg/Library/BaseMemoryLibSse2/X64/SetMem64.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
   4 ; 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 ;   SetMem64.nasm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   SetMem64 function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     DEFAULT REL
  25     SECTION .text
  26
  27 ;------------------------------------------------------------------------------
  28 ;  VOID *
  29 ;  InternalMemSetMem64 (
  30 ;    IN VOID   *Buffer,
  31 ;    IN UINTN  Count,
  32 ;    IN UINT64 Value
  33 ;    )
  34 ;------------------------------------------------------------------------------
  35 global ASM_PFX(InternalMemSetMem64)
  36 ASM_PFX(InternalMemSetMem64):
  37     mov     rax, rcx                    ; rax <- Buffer
  38     xchg    rcx, rdx                    ; rcx <- Count & rdx <- Buffer
  39     test    dl, 8
  40     movq    xmm0, r8
  41     jz      .0
  42     mov     [rdx], r8
  43     add     rdx, 8
  44     dec     rcx
  45 .0:
  46     shr     rcx, 1
  47     jz      @SetQwords
  48     movlhps xmm0, xmm0
  49 .1:
  50     movntdq [rdx], xmm0
  51     lea     rdx, [rdx + 16]
  52     loop    .1
  53     mfence
  54 @SetQwords:
  55     jnc     .2
  56     mov     [rdx], r8
  57 .2:
  58     ret
  59