diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S | 168 |
1 files changed, 84 insertions, 84 deletions
diff --git a/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S b/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S index 35db797677..553f53957e 100644 --- a/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S +++ b/MdePkg/Library/BaseMemoryLibSse2/X64/CopyMem.S @@ -1,84 +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 L0 # Copy forward if Source > Destination - cmp r9, rdi # Overlapped? - jae L_CopyBackward # Copy backward if overlapped -L0: - xor rcx, rcx - sub rcx, rdi # rcx <- -rdi - and rcx, 15 # rcx + rsi should be 16 bytes aligned - jz L1 # skip if rcx == 0 - cmp rcx, r8 - cmova rcx, r8 - sub r8, rcx - rep movsb -L1: - mov rcx, r8 - and r8, 15 - shr rcx, 4 # rcx <- # of DQwords to copy - jz L_CopyBytes - movdqa [rsp + 0x18], xmm0 # save xmm0 on stack -L2: - 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 L2 - mfence - movdqa xmm0, [rsp + 0x18] # restore xmm0 - jmp L_CopyBytes # copy remaining bytes -L_CopyBackward: - mov rsi, r9 # rsi <- Last byte of Source - lea rdi, [rdi + r8 - 1] # rdi <- Last byte of Destination - std -L_CopyBytes: - mov rcx, r8 - rep movsb - cld - pop rdi - pop rsi - ret +#
+# 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 L0 # Copy forward if Source > Destination
+ cmp r9, rdi # Overlapped?
+ jae L_CopyBackward # Copy backward if overlapped
+L0:
+ xor rcx, rcx
+ sub rcx, rdi # rcx <- -rdi
+ and rcx, 15 # rcx + rsi should be 16 bytes aligned
+ jz L1 # skip if rcx == 0
+ cmp rcx, r8
+ cmova rcx, r8
+ sub r8, rcx
+ rep movsb
+L1:
+ mov rcx, r8
+ and r8, 15
+ shr rcx, 4 # rcx <- # of DQwords to copy
+ jz L_CopyBytes
+ movdqa [rsp + 0x18], xmm0 # save xmm0 on stack
+L2:
+ 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 L2
+ mfence
+ movdqa xmm0, [rsp + 0x18] # restore xmm0
+ jmp L_CopyBytes # copy remaining bytes
+L_CopyBackward:
+ mov rsi, r9 # rsi <- Last byte of Source
+ lea rdi, [rdi + r8 - 1] # rdi <- Last byte of Destination
+ std
+L_CopyBytes:
+ mov rcx, r8
+ rep movsb
+ cld
+ pop rdi
+ pop rsi
+ ret
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