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-#
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-# ConvertAsm.py: Automatically generated from CopyMem.asm
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-#
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-#------------------------------------------------------------------------------
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-#
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-# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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-# This program and the accompanying materials
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-# are licensed and made available under the terms and conditions of the BSD License
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-# which accompanies this distribution. The full text of the license may be found at
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-# http://opensource.org/licenses/bsd-license.php.
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-#
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-# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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-# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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-#
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-# Module Name:
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-#
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-# CopyMem.S
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-#
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-# Abstract:
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-#
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-# CopyMem function
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-#
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-# Notes:
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-#
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-#------------------------------------------------------------------------------
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-
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-
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-#------------------------------------------------------------------------------
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-# VOID *
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-# EFIAPI
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-# InternalMemCopyMem (
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-# IN VOID *Destination,
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-# IN VOID *Source,
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-# IN UINTN Count
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-# )
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-#------------------------------------------------------------------------------
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-ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
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-ASM_PFX(InternalMemCopyMem):
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- pushq %rsi
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- pushq %rdi
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- movq %rdx, %rsi # rsi <- Source
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- movq %rcx, %rdi # rdi <- Destination
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- leaq -1(%rsi, %r8,), %r9 # r9 <- Last byte of Source
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- cmpq %rdi, %rsi
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- movq %rdi, %rax # rax <- Destination as return value
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- jae L0 # Copy forward if Source > Destination
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- cmpq %rdi, %r9 # Overlapped?
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- jae L_CopyBackward # Copy backward if overlapped
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-L0:
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- xorq %rcx, %rcx
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- subq %rdi, %rcx # rcx <- -rdi
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- andq $15, %rcx # rcx + rsi should be 16 bytes aligned
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- jz L1 # skip if rcx == 0
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- cmpq %r8, %rcx
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- cmova %r8, %rcx
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- subq %rcx, %r8
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- rep movsb
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-L1:
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- movq %r8, %rcx
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- andq $15, %r8
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- shrq $4, %rcx # rcx <- # of DQwords to copy
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- jz L_CopyBytes
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- movdqa %xmm0, 0x18(%rsp) # save xmm0 on stack
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-L2:
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- movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned
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- movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned
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- addq $16, %rsi
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- addq $16, %rdi
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- loop L2
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- mfence
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- movdqa 0x18(%rsp), %xmm0 # restore xmm0
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- jmp L_CopyBytes # copy remaining bytes
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-L_CopyBackward:
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- movq %r9, %rsi # rsi <- Last byte of Source
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- leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination
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- std
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-L_CopyBytes:
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- movq %r8, %rcx
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- rep movsb
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- cld
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- popq %rdi
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- popq %rsi
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- ret
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