#------------------------------------------------------------------------------ | |
# | |
# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR> | |
# 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: | |
# | |
# RShiftU64.S | |
# | |
# Abstract: | |
# | |
# 64-bit logical right shift function for IA-32 | |
# | |
#------------------------------------------------------------------------------ | |
.code: | |
ASM_GLOBAL ASM_PFX(InternalMathRShiftU64) | |
#------------------------------------------------------------------------------ | |
# UINT64 | |
# EFIAPI | |
# InternalMathRShiftU64 ( | |
# IN UINT64 Operand, | |
# IN UINTN Count | |
# ); | |
#------------------------------------------------------------------------------ | |
ASM_PFX(InternalMathRShiftU64): | |
movb 12(%esp), %cl # cl <- Count | |
xorl %edx, %edx | |
movl 8(%esp), %eax | |
testb $32, %cl # Count >= 32? | |
jnz L0 | |
movl %eax, %edx | |
movl 0x4(%esp), %eax | |
L0: | |
shrdl %cl, %edx, %eax | |
shr %cl, %edx | |
ret |