MdePkg/Library/BaseLib/Ia32/RRotU64.S File Reference


Detailed Description

#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2015, 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.S
#
# Abstract:
#
# 64-bit right rotation for Ia32
#
#------------------------------------------------------------------------------

ASM_GLOBAL ASM_PFX(InternalMathRRotU64)

#------------------------------------------------------------------------------
# UINT64
# EFIAPI
# InternalMathRRotU64 (
# IN UINT64 Operand,
# IN UINTN Count
# );
#------------------------------------------------------------------------------
ASM_PFX(InternalMathRRotU64):
push ebx
movb 16(esp), cl
movl 8(esp), eax
movl 12(esp), edx
shrdl cl, eax, ebx
shrdl cl, edx, eax
roll cl, ebx
shrdl cl, ebx, edx
testb $32, cl # Count >= 32?
jz L0
movl eax, ecx # switch eax & edx if Count >= 32
movl edx, eax
movl ecx, edx
L0:
pop ebx
ret


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