diff options
Diffstat (limited to 'MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.S')
| -rw-r--r-- | MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.S | 43 |
1 files changed, 21 insertions, 22 deletions
diff --git a/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.S b/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.S index c7c07ad309..fc8efdeaec 100644 --- a/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.S +++ b/MdePkg/Library/BaseMemoryLibOptDxe/X64/SetMem.S @@ -1,6 +1,6 @@ #------------------------------------------------------------------------------
#
-# Copyright (c) 2006 - 2008, Intel Corporation
+# Copyright (c) 2006 - 2009, 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
@@ -29,30 +29,29 @@ # IN UINT8 Value
# )
#------------------------------------------------------------------------------
-.intel_syntax noprefix
ASM_GLOBAL ASM_PFX(InternalMemSetMem)
ASM_PFX(InternalMemSetMem):
- push rdi
- push rbx
- push rcx # push Buffer
- mov rax, r8 # rax = Value
- and rax, 0xff # rax = lower 8 bits of r8, upper 56 bits are 0
- mov ah, al # ah = al
- mov bx, ax # bx = ax
- shl rax, 0x10 # rax = ax << 16
- mov ax, bx # ax = bx
- mov rbx, rax # ebx = eax
- shl rax, 0x20 # rax = rax << 32
- or rax, rbx # eax = ebx
- mov rdi, rcx # rdi = Buffer
- mov rcx, rdx # rcx = Count
- shr rcx, 3 # rcx = rcx / 8
+ pushq %rdi
+ pushq %rbx
+ pushq %rcx # push Buffer
+ movq %r8, %rax # rax = Value
+ andq $0xff, %rax # rax = lower 8 bits of r8, upper 56 bits are 0
+ movb %al, %ah # ah = al
+ movw %ax, %bx # bx = ax
+ shlq $0x10, %rax # rax = ax << 16
+ movw %bx, %ax # ax = bx
+ movq %rax, %rbx # ebx = eax
+ shlq $0x20, %rax # rax = rax << 32
+ orq %rbx, %rax # eax = ebx
+ movq %rcx, %rdi # rdi = Buffer
+ movq %rdx, %rcx # rcx = Count
+ shrq $3, %rcx # rcx = rcx / 8
cld
rep stosq
- mov rcx, rdx # rcx = rdx
- and rcx, 7 # rcx = rcx & 7
+ movq %rdx, %rcx # rcx = rdx
+ andq $7, %rcx # rcx = rcx & 7
rep stosb
- pop rax # rax = Buffer
- pop rbx
- pop rdi
+ popq %rax # rax = Buffer
+ popq %rbx
+ popq %rdi
ret
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