;------------------------------------------------------------------------------ | |
; | |
; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
; Module Name: | |
; | |
; RRotU64.nasm | |
; | |
; Abstract: | |
; | |
; 64-bit right rotation for Ia32 | |
; | |
;------------------------------------------------------------------------------ | |
SECTION .text | |
;------------------------------------------------------------------------------ | |
; UINT64 | |
; EFIAPI | |
; InternalMathRRotU64 ( | |
; IN UINT64 Operand, | |
; IN UINTN Count | |
; ); | |
;------------------------------------------------------------------------------ | |
global ASM_PFX(InternalMathRRotU64) | |
ASM_PFX(InternalMathRRotU64): | |
push 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 ; Count >= 32? | |
jz .0 | |
mov ecx, eax ; switch eax & edx if Count >= 32 | |
mov eax, edx | |
mov edx, ecx | |
.0: | |
pop ebx | |
ret | |