MdePkg/Library/BaseMemoryLibSse2/X64/ZeroMem.S

   1 #
   2 # ConvertAsm.py: Automatically generated from ZeroMem.asm
   3 #
   4 #------------------------------------------------------------------------------
   5 #
   6 # Copyright (c) 2006 - 2008, Intel Corporation
   7 # All rights reserved. This program and the accompanying materials
   8 # are licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 # Module Name:
  16 #
  17 #   ZeroMem.S
  18 #
  19 # Abstract:
  20 #
  21 #   ZeroMem function
  22 #
  23 # Notes:
  24 #
  25 #------------------------------------------------------------------------------
  26
  27
  28 #------------------------------------------------------------------------------
  29 #  VOID *
  30 #  InternalMemZeroMem (
  31 #    IN VOID   *Buffer,
  32 #    IN UINTN  Count
  33 #    );
  34 #------------------------------------------------------------------------------
  35 .intel_syntax noprefix
  36 .globl ASM_PFX(InternalMemZeroMem)
  37 ASM_PFX(InternalMemZeroMem):
  38     push    rdi
  39     mov     rdi, rcx
  40     xor     rcx, rcx
  41     xor     eax, eax
  42     sub     rcx, rdi
  43     and     rcx, 15
  44     mov     r8, rdi
  45     jz      L0
  46     cmp     rcx, rdx
  47     cmova   rcx, rdx
  48     sub     rdx, rcx
  49     rep     stosb
  50 L0:
  51     mov     rcx, rdx
  52     and     edx, 15
  53     shr     rcx, 4
  54     jz      L_ZeroBytes
  55     pxor    xmm0, xmm0
  56 L1:
  57     movntdq [rdi], xmm0                 # rdi should be 16-byte aligned
  58     add     rdi, 16
  59     loop    L1
  60     mfence
  61 L_ZeroBytes:
  62     mov     ecx, edx
  63     rep     stosb
  64     mov     rax, r8
  65     pop     rdi
  66     ret