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#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, 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
#
#------------------------------------------------------------------------------
.686:
.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?
cmovz %eax, %edx
cmovz 0x4(%esp), %eax
shrdl %cl, %edx, %eax
shr %cl, %edx
ret
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