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author | raywu <raywu0301@gmail.com> | 2018-06-15 00:00:50 +0800 |
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committer | raywu <raywu0301@gmail.com> | 2018-06-15 00:00:50 +0800 |
commit | b7c51c9cf4864df6aabb99a1ae843becd577237c (patch) | |
tree | eebe9b0d0ca03062955223097e57da84dd618b9a /EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c | |
download | zprj-master.tar.xz |
Diffstat (limited to 'EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c')
-rw-r--r-- | EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c new file mode 100644 index 0000000..2b8c47b --- /dev/null +++ b/EDK/Foundation/Library/EdkIIGlueLib/Library/BaseLib/GetPowerOfTwo32.c @@ -0,0 +1,48 @@ +/*++ + +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: + + GetPowerOfTwo32.c + +Abstract: + + Math worker functions. + +--*/ + +#include "BaseLibInternal.h" + +/** + Returns the value of the highest bit set in a 32-bit value. Equivalent to + 1 << HighBitSet32(x). + + This function computes the value of the highest bit set in the 32-bit value + specified by Operand. If Operand is zero, then zero is returned. + + @param Operand The 32-bit operand to evaluate. + + @return 1 << HighBitSet32(Operand) + @retval 0 Operand is zero. + +**/ +UINT32 +EFIAPI +GetPowerOfTwo32 ( + IN UINT32 Operand + ) +{ + if (Operand == 0) { + return 0; + } + + return 1ul << HighBitSet32 (Operand); +} |