MdePkg/Library/BaseLib/Ia32/LRotU64.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:
#
# LRotU64.S
#
# Abstract:
#
# 64-bit left rotation for Ia32
#
#------------------------------------------------------------------------------
ASM_GLOBAL
ASM_PFX(InternalMathLRotU64)
#------------------------------------------------------------------------------
# UINT64
# EFIAPI
# InternalMathLRotU64 (
# IN UINT64 Operand,
# IN UINTN Count
# );
#------------------------------------------------------------------------------
ASM_PFX(InternalMathLRotU64):
push ebx
movb 16(esp), cl
movl 12(esp), edx
movl 8(esp), eax
shldl cl, edx, ebx
shldl cl, eax, edx
rorl cl, ebx
shldl cl, ebx, eax
testb $32, cl # Count >= 32?
jz L0
movl eax, ecx
movl edx, eax
movl ecx, edx
L0:
pop ebx
ret