diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S | 170 |
1 files changed, 85 insertions, 85 deletions
diff --git a/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S b/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S index ddbcbaf1b1..99dd7a5099 100644 --- a/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S +++ b/MdePkg/Library/BaseMemoryLibSse2/Ia32/CopyMem.S @@ -1,85 +1,85 @@ -#------------------------------------------------------------------------------ -# -# 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.asm -# -# Abstract: -# -# CopyMem function -# -# Notes: -# -#------------------------------------------------------------------------------ - -.globl _InternalMemCopyMem - -#------------------------------------------------------------------------------ -# VOID * -# EFIAPI -# InternalMemCopyMem ( -# IN VOID *Destination, -# IN VOID *Source, -# IN UINTN Count -# ); -#------------------------------------------------------------------------------ -_InternalMemCopyMem: - push %esi - push %edi - movl 16(%esp), %esi # esi <- Source - movl 12(%esp), %edi # edi <- Destination - movl 20(%esp), %edx # edx <- Count - leal -1(%esi,%edx,), %eax # eax <- End of Source - cmpl %edi, %esi - jae L0 - cmpl %edi, %eax # Overlapped? - jae L_CopyBackward # Copy backward if overlapped -L0: - xorl %ecx, %ecx - subl %edi, %ecx - andl $15, %ecx # ecx + edi aligns on 16-byte boundary - jz L1 - cmpl %edx, %ecx - cmova %edx, %ecx - subl %ecx, %edx # edx <- remaining bytes to copy - rep - movsb -L1: - movl %edx, %ecx - andl $15, %edx - shrl $4, %ecx # ecx <- # of DQwords to copy - jz L_CopyBytes - addl $-16, %esp - movdqu %xmm0, (%esp) -L2: - movdqu (%esi), %xmm0 - movntdq %xmm0, (%edi) - addl $16, %esi - addl $16, %edi - loop L2 - mfence - movdqu (%esp),%xmm0 - addl $16, %esp # stack cleanup - jmp L_CopyBytes -L_CopyBackward: - movl %eax, %esi # esi <- Last byte in Source - leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination - std -L_CopyBytes: - movl %edx, %ecx - rep - movsb - cld - movl 12(%esp), %eax # eax <- Destination as return value - pop %edi - pop %esi - ret +#------------------------------------------------------------------------------
+#
+# 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.asm
+#
+# Abstract:
+#
+# CopyMem function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+.globl _InternalMemCopyMem
+
+#------------------------------------------------------------------------------
+# VOID *
+# EFIAPI
+# InternalMemCopyMem (
+# IN VOID *Destination,
+# IN VOID *Source,
+# IN UINTN Count
+# );
+#------------------------------------------------------------------------------
+_InternalMemCopyMem:
+ push %esi
+ push %edi
+ movl 16(%esp), %esi # esi <- Source
+ movl 12(%esp), %edi # edi <- Destination
+ movl 20(%esp), %edx # edx <- Count
+ leal -1(%esi,%edx,), %eax # eax <- End of Source
+ cmpl %edi, %esi
+ jae L0
+ cmpl %edi, %eax # Overlapped?
+ jae L_CopyBackward # Copy backward if overlapped
+L0:
+ xorl %ecx, %ecx
+ subl %edi, %ecx
+ andl $15, %ecx # ecx + edi aligns on 16-byte boundary
+ jz L1
+ cmpl %edx, %ecx
+ cmova %edx, %ecx
+ subl %ecx, %edx # edx <- remaining bytes to copy
+ rep
+ movsb
+L1:
+ movl %edx, %ecx
+ andl $15, %edx
+ shrl $4, %ecx # ecx <- # of DQwords to copy
+ jz L_CopyBytes
+ addl $-16, %esp
+ movdqu %xmm0, (%esp)
+L2:
+ movdqu (%esi), %xmm0
+ movntdq %xmm0, (%edi)
+ addl $16, %esi
+ addl $16, %edi
+ loop L2
+ mfence
+ movdqu (%esp),%xmm0
+ addl $16, %esp # stack cleanup
+ jmp L_CopyBytes
+L_CopyBackward:
+ movl %eax, %esi # esi <- Last byte in Source
+ leal -1(%edi,%edx,), %edi # edi <- Last byte in Destination
+ std
+L_CopyBytes:
+ movl %edx, %ecx
+ rep
+ movsb
+ cld
+ movl 12(%esp), %eax # eax <- Destination as return value
+ pop %edi
+ pop %esi
+ ret
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