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[mirror_edk2.git] / MdePkg / Library / BaseMemoryLibSse2 / X64 / CopyMem.S

#\r
# ConvertAsm.py: Automatically generated from CopyMem.asm\r
#\r
#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2008, Intel Corporation\r
# All rights reserved. This program and the accompanying materials\r
# are licensed and made available under the terms and conditions of the BSD License\r
# which accompanies this distribution.  The full text of the license may be found at\r
# http://opensource.org/licenses/bsd-license.php\r
#\r
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#\r
# Module Name:\r
#\r
#   CopyMem.S\r
#\r
# Abstract:\r
#\r
#   CopyMem function\r
#\r
# Notes:\r
#\r
#------------------------------------------------------------------------------\r
\r
\r
#------------------------------------------------------------------------------\r
#  VOID *\r
#  EFIAPI\r
#  InternalMemCopyMem (\r
#    IN VOID   *Destination,\r
#    IN VOID   *Source,\r
#    IN UINTN  Count\r
#    )\r
#------------------------------------------------------------------------------\r
.intel_syntax noprefix\r
.globl ASM_PFX(InternalMemCopyMem)\r
ASM_PFX(InternalMemCopyMem):\r
    push    rsi\r
    push    rdi\r
    mov     rsi, rdx                    # rsi <- Source\r
    mov     rdi, rcx                    # rdi <- Destination\r
    lea     r9, [rsi + r8 - 1]          # r9 <- Last byte of Source\r
    cmp     rsi, rdi                    \r
    mov     rax, rdi                    # rax <- Destination as return value\r
    jae     L0                          # Copy forward if Source > Destination\r
    cmp     r9, rdi                     # Overlapped?\r
    jae     L_CopyBackward              # Copy backward if overlapped\r
L0:            \r
    xor     rcx, rcx                    \r
    sub     rcx, rdi                    # rcx <- -rdi\r
    and     rcx, 15                     # rcx + rsi should be 16 bytes aligned\r
    jz      L1                          # skip if rcx == 0\r
    cmp     rcx, r8\r
    cmova   rcx, r8\r
    sub     r8, rcx\r
    rep     movsb\r
L1:\r
    mov     rcx, r8\r
    and     r8, 15\r
    shr     rcx, 4                      # rcx <- # of DQwords to copy\r
    jz      L_CopyBytes\r
    movdqa  [rsp + 0x18], xmm0          # save xmm0 on stack\r
L2:\r
    movdqu  xmm0, [rsi]                 # rsi may not be 16-byte aligned\r
    movntdq [rdi], xmm0                 # rdi should be 16-byte aligned\r
    add     rsi, 16\r
    add     rdi, 16\r
    loop    L2\r
    mfence\r
    movdqa  xmm0, [rsp + 0x18]          # restore xmm0\r
    jmp     L_CopyBytes                 # copy remaining bytes\r
L_CopyBackward:\r
    mov     rsi, r9                     # rsi <- Last byte of Source\r
    lea     rdi, [rdi + r8 - 1]         # rdi <- Last byte of Destination\r
    std\r
L_CopyBytes:\r
    mov     rcx, r8\r
    rep     movsb\r
    cld\r
    pop     rdi\r
    pop     rsi\r
    ret\r