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author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
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committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseLib/GetPowerOfTwo64.c | |
parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseLib/GetPowerOfTwo64.c')
-rw-r--r-- | Core/MdePkg/Library/BaseLib/GetPowerOfTwo64.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseLib/GetPowerOfTwo64.c b/Core/MdePkg/Library/BaseLib/GetPowerOfTwo64.c new file mode 100644 index 0000000000..3574bc4d3c --- /dev/null +++ b/Core/MdePkg/Library/BaseLib/GetPowerOfTwo64.c @@ -0,0 +1,44 @@ +/** @file
+ Math worker functions.
+
+ Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+ 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.
+
+**/
+
+
+
+
+#include "BaseLibInternals.h"
+
+/**
+ Returns the value of the highest bit set in a 64-bit value. Equivalent to
+ 1 << log2(x).
+
+ This function computes the value of the highest bit set in the 64-bit value
+ specified by Operand. If Operand is zero, then zero is returned.
+
+ @param Operand The 64-bit operand to evaluate.
+
+ @return 1 << HighBitSet64(Operand)
+ @retval 0 Operand is zero.
+
+**/
+UINT64
+EFIAPI
+GetPowerOfTwo64 (
+ IN UINT64 Operand
+ )
+{
+ if (Operand == 0) {
+ return 0;
+ }
+
+ return LShiftU64 (1, (UINTN) HighBitSet64 (Operand));
+}
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