diff options
author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
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committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S')
-rw-r--r-- | Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S b/Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S new file mode 100644 index 0000000000..13a47dc1eb --- /dev/null +++ b/Core/MdePkg/Library/BaseMemoryLibOptDxe/X64/CopyMem.S @@ -0,0 +1,82 @@ +#
+# ConvertAsm.py: Automatically generated from CopyMem.asm
+#
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
+# 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
+# )
+#------------------------------------------------------------------------------
+ASM_GLOBAL ASM_PFX(InternalMemCopyMem)
+ASM_PFX(InternalMemCopyMem):
+ pushq %rsi
+ pushq %rdi
+ movq %rdx, %rsi # rsi <- Source
+ movq %rcx, %rdi # rdi <- Destination
+ leaq -1(%rsi,%r8,), %r9 # r9 <- Last byte of Source
+ cmpq %rdi, %rsi
+ movq %rdi, %rax # rax <- Destination as return value
+ jae L0 # Copy forward if Source > Destination
+ cmpq %rdi, %r9 # Overlapped?
+ jae L_CopyBackward # Copy backward if overlapped
+L0:
+ xorq %rcx, %rcx
+ subq %rdi, %rcx # rcx <- -rdi
+ andq $15, %rcx # rcx + rsi should be 16 bytes aligned
+ jz L1 # skip if rcx == 0
+ cmpq %r8, %rcx
+ cmova %r8, %rcx
+ subq %rcx, %r8
+ rep movsb
+L1:
+ movq %r8, %rcx
+ andq $15, %r8
+ shrq $4, %rcx # rcx <- # of DQwords to copy
+ jz L_CopyBytes
+ movdqu %xmm0, 0x18(%rsp) # save xmm0 on stack
+L2:
+ movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned
+ movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned
+ addq $16, %rsi
+ addq $16, %rdi
+ loop L2
+ mfence
+ movdqa 0x18(%rsp), %xmm0 # restore xmm0
+ jmp L_CopyBytes # copy remaining bytes
+L_CopyBackward:
+ movq %r9, %rsi # rsi <- Last byte of Source
+ leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination
+ std
+L_CopyBytes:
+ movq %r8, %rcx
+ rep movsb
+ cld
+ popq %rdi
+ popq %rsi
+ ret
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