audk/MdePkg/Library/BaseLib/Ia32/RRotU64.asm

42 lines
1.1 KiB
NASM

;------------------------------------------------------------------------------
;
; 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:
;
; RRotU64.asm
;
; Abstract:
;
; 64-bit right rotation for Ia32
;
;------------------------------------------------------------------------------
.686
.model flat,C
.code
InternalMathRRotU64 PROC USES ebx
mov cl, [esp + 16]
mov eax, [esp + 8]
mov edx, [esp + 12]
shrd ebx, eax, cl
shrd eax, edx, cl
rol ebx, cl
shrd edx, ebx, cl
test cl, 32
cmovnz ecx, eax
cmovnz eax, edx
cmovnz edx, ecx
ret
InternalMathRRotU64 ENDP
END