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;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; RShiftU64.nasm
;
; Abstract:
;
; 64-bit logical right shift function for IA-32
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; InternalMathRShiftU64 (
; IN UINT64 Operand,
; IN UINTN Count
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMathRShiftU64)
ASM_PFX(InternalMathRShiftU64):
mov cl, [esp + 12] ; cl <- Count
xor edx, edx
mov eax, [esp + 8]
test cl, 32 ; Count >= 32?
jnz .0
mov edx, eax
mov eax, [esp + 4]
.0:
shrd eax, edx, cl
shr edx, cl
ret
|
