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git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/BaseLib/Ia32/LShiftU64.c
2 64-bit left shift function for IA-32.
4 Copyright (c) 2006 - 2007, Intel Corporation<BR>
5 All rights reserved. This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 Shifts a 64-bit integer left between 0 and 63 bits. The low bits
20 are filled with zeros. The shifted value is returned.
22 This function shifts the 64-bit value Operand to the left by Count bits. The
23 low Count bits are set to zero. The shifted value is returned.
25 @param Operand The 64-bit operand to shift left.
26 @param Count The number of bits to shift left.
28 @return Operand << Count
33 InternalMathLShiftU64 (
39 mov cl
, byte ptr
[Count
]
41 mov edx
, dword ptr
[Operand
+ 0]
42 test cl
, 32 // Count >= 32?
44 cmovz edx
, dword ptr
[Operand
+ 4]