]>
git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/BaseLib/Ia32/LShiftU64.c
f684e1f29a03f2955456a00ffd59c45513a9aec1
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.
16 // Include common header file for this module.
21 Shifts a 64-bit integer left between 0 and 63 bits. The low bits
22 are filled with zeros. The shifted value is returned.
24 This function shifts the 64-bit value Operand to the left by Count bits. The
25 low Count bits are set to zero. The shifted value is returned.
27 @param Operand The 64-bit operand to shift left.
28 @param Count The number of bits to shift left.
30 @return Operand << Count
35 InternalMathLShiftU64 (
41 mov cl
, byte ptr
[Count
]
43 mov edx
, dword ptr
[Operand
+ 0]
44 test cl
, 32 // Count >= 32?
46 cmovz edx
, dword ptr
[Operand
+ 4]