MdePkg/Library/BaseMemoryLibSse2/X64/SetMem.S

   1 #
   2 # ConvertAsm.py: Automatically generated from SetMem.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 #   SetMem.S
  18 #
  19 # Abstract:
  20 #
  21 #   SetMem function
  22 #
  23 # Notes:
  24 #
  25 #------------------------------------------------------------------------------
  26
  27
  28 #------------------------------------------------------------------------------
  29 #  VOID *
  30 #  EFIAPI
  31 #  InternalMemSetMem (
  32 #    IN VOID   *Buffer,
  33 #    IN UINTN  Count,
  34 #    IN UINT8  Value
  35 #    )
  36 #------------------------------------------------------------------------------
  37 .intel_syntax noprefix
  38 .globl ASM_PFX(InternalMemSetMem)
  39 ASM_PFX(InternalMemSetMem):
  40     push    rdi
  41     mov     rdi, rcx                    # rdi <- Buffer
  42     mov     al, r8b                     # al <- Value
  43     mov     r9, rdi                     # r9 <- Buffer as return value
  44     xor     rcx, rcx
  45     sub     rcx, rdi
  46     and     rcx, 15                     # rcx + rdi aligns on 16-byte boundary
  47     jz      L0
  48     cmp     rcx, rdx
  49     cmova   rcx, rdx
  50     sub     rdx, rcx
  51     rep     stosb
  52 L0:
  53     mov     rcx, rdx
  54     and     rdx, 15
  55     shr     rcx, 4
  56     jz      L_SetBytes
  57     mov     ah, al                      # ax <- Value repeats twice
  58     movdqa  [rsp + 0x10], xmm0          # save xmm0
  59     movd    xmm0, eax                   # xmm0[0..16] <- Value repeats twice
  60     pshuflw xmm0, xmm0, 0               # xmm0[0..63] <- Value repeats 8 times
  61     movlhps xmm0, xmm0                  # xmm0 <- Value repeats 16 times
  62 L1:
  63     movntdq [rdi], xmm0                 # rdi should be 16-byte aligned
  64     add     rdi, 16
  65     loop    L1
  66     mfence
  67     movdqa  xmm0, [rsp + 0x10]          # restore xmm0
  68 L_SetBytes:
  69     mov     ecx, edx                    # high 32 bits of rcx are always zero
  70     rep     stosb
  71     mov     rax, r9                     # rax <- Return value
  72     pop     rdi
  73     ret