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| author | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-04-21 22:54:32 +0000 |
|---|---|---|
| committer | bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524> | 2006-04-21 22:54:32 +0000 |
| commit | 878ddf1fc3540a715f63594ed22b6929e881afb4 (patch) | |
| tree | c56c44dac138137b510e1fba7c3efe5e4d84bea2 /MdePkg/Library/BaseLib/GetPowerOfTwo64.c | |
| download | edk2-platforms-878ddf1fc3540a715f63594ed22b6929e881afb4.tar.xz | |
Initial import.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdePkg/Library/BaseLib/GetPowerOfTwo64.c')
| -rw-r--r-- | MdePkg/Library/BaseLib/GetPowerOfTwo64.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/GetPowerOfTwo64.c b/MdePkg/Library/BaseLib/GetPowerOfTwo64.c new file mode 100644 index 0000000000..9994fb8f12 --- /dev/null +++ b/MdePkg/Library/BaseLib/GetPowerOfTwo64.c @@ -0,0 +1,39 @@ +/** @file
+ Math worker functions.
+
+ Copyright (c) 2006, Intel Corporation<BR>
+ 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.
+
+**/
+
+#include "BaseLibInternals.h"
+
+/**
+ Returns the value of the highest bit set in a 64-bit value. Equivalent to
+ 1 << HighBitSet64(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
+ )
+{
+ INTN BitPos;
+
+ return (BitPos = HighBitSet64 (Operand)) > 0 ? LShiftU64 (1, BitPos) : 0;
+}
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