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3eb9473e | 1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2004 - 2006, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | \r | |
13 | Module Name:\r | |
14 | \r | |
15 | LowBitSet32.c\r | |
16 | \r | |
17 | Abstract: \r | |
18 | \r | |
19 | Math worker functions.\r | |
20 | \r | |
21 | --*/\r | |
22 | \r | |
c7f33ca4 | 23 | #include "BaseLibInternals.h"\r |
3eb9473e | 24 | \r |
25 | /**\r | |
26 | Returns the bit position of the lowest bit set in a 32-bit value.\r | |
27 | \r | |
28 | This function computes the bit position of the lowest bit set in the 32-bit\r | |
29 | value specified by Operand. If Operand is zero, then -1 is returned.\r | |
30 | Otherwise, a value between 0 and 31 is returned.\r | |
31 | \r | |
32 | @param Operand The 32-bit operand to evaluate.\r | |
33 | \r | |
34 | @return Position of the lowest bit set in Operand if found.\r | |
35 | @retval -1 Operand is zero.\r | |
36 | \r | |
37 | **/\r | |
38 | INTN\r | |
39 | EFIAPI\r | |
40 | LowBitSet32 (\r | |
41 | IN UINT32 Operand\r | |
42 | )\r | |
43 | {\r | |
44 | INTN BitIndex;\r | |
45 | \r | |
46 | if (Operand == 0) {\r | |
47 | return -1;\r | |
48 | }\r | |
49 | \r | |
50 | for (BitIndex = 0; (Operand & 1) == 0; BitIndex++, Operand >>= 1);\r | |
51 | return BitIndex;\r | |
52 | }\r |