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git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/BaseLib/Ia32/LRotU64.c
2 64-bit left rotation for Ia32
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 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 Rotates a 64-bit integer left between 0 and 63 bits, filling
20 the low bits with the high bits that were rotated.
22 This function rotates the 64-bit value Operand to the left by Count bits. The
23 low Count bits are fill with the high Count bits of Operand. The rotated
26 @param Operand The 64-bit operand to rotate left.
27 @param Count The number of bits to rotate left.
29 @return Operand <<< Count
40 mov cl
, byte ptr
[Count
]
41 mov edx
, dword ptr
[Operand
+ 4]
42 mov eax
, dword ptr
[Operand
+ 0]
47 test cl
, 32 ; Count
>= 32?