/** @file | |
Math worker functions. | |
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include "BaseLibInternals.h" | |
/** | |
Returns the bit position of the lowest bit set in a 32-bit value. | |
This function computes the bit position of the lowest bit set in the 32-bit | |
value specified by Operand. If Operand is zero, then -1 is returned. | |
Otherwise, a value between 0 and 31 is returned. | |
@param Operand The 32-bit operand to evaluate. | |
@retval 0..31 The lowest bit set in Operand was found. | |
@retval -1 Operand is zero. | |
**/ | |
INTN | |
EFIAPI | |
LowBitSet32 ( | |
IN UINT32 Operand | |
) | |
{ | |
INTN BitIndex; | |
if (Operand == 0) { | |
return -1; | |
} | |
for (BitIndex = 0; 0 == (Operand & 1); BitIndex++, Operand >>= 1) { | |
} | |
return BitIndex; | |
} |