diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S')
-rw-r--r-- | MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S b/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S new file mode 100644 index 0000000000..dc47510874 --- /dev/null +++ b/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S @@ -0,0 +1,84 @@ +# +# ConvertAsm.py: Automatically generated from CopyMem.asm +# +#------------------------------------------------------------------------------ +# +# Copyright (c) 2006, Intel Corporation +# All rights reserved. This program and the accompanying materials +# are licensed and made available under the terms and conditions of the BSD License +# which accompanies this distribution. The full text of the license may be found at +# http://opensource.org/licenses/bsd-license.php +# +# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, +# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. +# +# Module Name: +# +# CopyMem.S +# +# Abstract: +# +# CopyMem function +# +# Notes: +# +#------------------------------------------------------------------------------ + + +#------------------------------------------------------------------------------ +# VOID * +# EFIAPI +# InternalMemCopyMem ( +# IN VOID *Destination, +# IN VOID *Source, +# IN UINTN Count +# ) +#------------------------------------------------------------------------------ +.intel_syntax noprefix +.globl ASM_PFX(InternalMemCopyMem) +ASM_PFX(InternalMemCopyMem): + push rsi + push rdi + mov rsi, rdx # rsi <- Source + mov rdi, rcx # rdi <- Destination + lea r9, [rsi + r8 - 1] # r9 <- Last byte of Source + cmp rsi, rdi + mov rax, rdi # rax <- Destination as return value + jae _InternalMemCopyMem_al_0000 # Copy forward if Source > Destination + cmp r9, rdi # Overlapped? + jae _atSym_CopyBackward # Copy backward if overlapped +_InternalMemCopyMem_al_0000: + xor rcx, rcx + sub rcx, rdi # rcx <- -rdi + and rcx, 15 # rcx + rsi should be 16 bytes aligned + jz _InternalMemCopyMem_al_0001 # skip if rcx == 0 + cmp rcx, r8 + cmova rcx, r8 + sub r8, rcx + rep movsb +_InternalMemCopyMem_al_0001: + mov rcx, r8 + and r8, 15 + shr rcx, 4 # rcx <- # of DQwords to copy + jz _atSym_CopyBytes + movdqa [rsp + 0x18], xmm0 # save xmm0 on stack +_InternalMemCopyMem_al_0002: + movdqu xmm0, [rsi] # rsi may not be 16-byte aligned + movntdq [rdi], xmm0 # rdi should be 16-byte aligned + add rsi, 16 + add rdi, 16 + loop _InternalMemCopyMem_al_0002 + mfence + movdqa xmm0, [rsp + 0x18] # restore xmm0 + jmp _atSym_CopyBytes # copy remaining bytes +_atSym_CopyBackward: + mov rsi, r9 # rsi <- Last byte of Source + lea rdi, [rdi + r8 - 1] # rdi <- Last byte of Destination + std +_atSym_CopyBytes: + mov rcx, r8 + rep movsb + cld + pop rdi + pop rsi + ret |