diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S b/MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S new file mode 100644 index 0000000000..fb1dccee0b --- /dev/null +++ b/MdePkg/Library/BaseMemoryLibMmx/X64/CompareMem.S @@ -0,0 +1,52 @@ +#------------------------------------------------------------------------------ +# +# 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: +# +# CompareMem.Asm +# +# Abstract: +# +# CompareMem function +# +# Notes: +# +# The following BaseMemoryLib instances share the same version of this file: +# +# BaseMemoryLibRepStr +# BaseMemoryLibMmx +# BaseMemoryLibSse2 +# +#------------------------------------------------------------------------------ + +#------------------------------------------------------------------------------ +# INTN +# EFIAPI +# InternalMemCompareMem ( +# IN CONST VOID *DestinationBuffer, +# IN CONST VOID *SourceBuffer, +# IN UINTN Length +# ); +#------------------------------------------------------------------------------ +.global _InternalMemCompareMem; +_InternalMemCompareMem: + push %rsi + push %rdi + mov %rcx, %rsi + mov %rdx, %rdi + mov %r8, %rcx + repe cmpsb + movzbq -1(%rsi), %rax + movzbq -1(%rdi), %rdx + sub %rdx, %rax + pop %rdi + pop %rsi + ret |