MdePkg/Library/BaseMemoryLibSse2/ia32/SetMem32.s

   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     .686:
  25     #.MODEL flat,C
  26     .xmm:
  27     .code:
  28
  29 #------------------------------------------------------------------------------
  30 #  VOID *
  31 #  _mem_SetMem32 (
  32 #    IN VOID   *Buffer,
  33 #    IN UINTN  Count,
  34 #    IN UINT32 Value
  35 #    )
  36 #------------------------------------------------------------------------------
  37 .global _InternalMemSetMem32
  38 _InternalMemSetMem32:
  39     push    %edi
  40     movl    12(%esp), %edx
  41     movl    8(%esp), %edi
  42     xorl    %ecx, %ecx
  43     subl    %edi, %ecx
  44     andl    $15, %ecx                   # ecx + edi aligns on 16-byte boundary
  45     movl    16(%esp), %eax
  46     jz      L0
  47     shrl    $2, %ecx
  48     cmpl    %edx, %ecx
  49     cmova   %edx, %ecx
  50     subl    %ecx, %edx
  51     rep
  52     stosl
  53 L0:
  54     movl    %edx, %ecx
  55     andl    $3, %edx
  56     shrl    $2, %ecx
  57     jz      @SetDwords
  58     movd    %eax, %xmm0
  59     pshufd  $0, %xmm0, %xmm0
  60 L1:
  61     movntdq %xmm0, (%edi)
  62     addl    $16, %edi
  63     loop    L1
  64     mfence
  65 @SetDwords:
  66     movl    %edx, %ecx
  67     rep
  68     stosl
  69     movl    8(%esp), %eax
  70     pop     %edi
  71     ret