lrotu32.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言 代码 · 共 51 行

/*++

Copyright (c) 2004 - 2006, 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:

  LRotU32.c
  
Abstract: 

  Math worker functions.

--*/

#include "BaseLibInternal.h"

/**
  Rotates a 32-bit integer left between 0 and 31 bits, filling the low bits
  with the high bits that were rotated.

  This function rotates the 32-bit value Operand to the left by Count bits. The
  low Count bits are fill with the high Count bits of Operand. The rotated
  value is returned.

  If Count is greater than 31, then ASSERT().

  @param  Operand The 32-bit operand to rotate left.
  @param  Count   The number of bits to rotate left.

  @return Operand <<< Count

**/
UINT32
EFIAPI
LRotU32 (
  IN      UINT32                    Operand,
  IN      UINTN                     Count
  )
{
  ASSERT (Count < sizeof (Operand) * 8);
  return (Operand << Count) | (Operand >> (32 - Count));
}