diff options
Diffstat (limited to 'Core/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.nasm')
-rw-r--r-- | Core/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.nasm | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.nasm b/Core/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.nasm new file mode 100644 index 0000000000..293a39b256 --- /dev/null +++ b/Core/MdePkg/Library/BaseMemoryLibSse2/X64/CompareMem.nasm @@ -0,0 +1,58 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2008, 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:
+;
+; CompareMem.Asm
+;
+; Abstract:
+;
+; CompareMem function
+;
+; Notes:
+;
+; The following BaseMemoryLib instances contain the same copy of this file:
+;
+; BaseMemoryLibRepStr
+; BaseMemoryLibMmx
+; BaseMemoryLibSse2
+; BaseMemoryLibOptDxe
+; BaseMemoryLibOptPei
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; INTN
+; EFIAPI
+; InternalMemCompareMem (
+; IN CONST VOID *DestinationBuffer,
+; IN CONST VOID *SourceBuffer,
+; IN UINTN Length
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemCompareMem)
+ASM_PFX(InternalMemCompareMem):
+ push rsi
+ push rdi
+ mov rsi, rcx
+ mov rdi, rdx
+ mov rcx, r8
+ repe cmpsb
+ movzx rax, byte [rsi - 1]
+ movzx rdx, byte [rdi - 1]
+ sub rax, rdx
+ pop rdi
+ pop rsi
+ ret
+
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