X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=OldMdePkg%2FLibrary%2FBaseLib%2FGetPowerOfTwo64.c;fp=OldMdePkg%2FLibrary%2FBaseLib%2FGetPowerOfTwo64.c;h=52d148c9244ea0b0ed3cfec73e4e0e68a556a043;hp=0000000000000000000000000000000000000000;hb=586cd1f1f4129ab7ec24543d4968801e17cc870b;hpb=144d783d40c8a02113350feabd1b9a55b692313f

diff --git a/OldMdePkg/Library/BaseLib/GetPowerOfTwo64.c b/OldMdePkg/Library/BaseLib/GetPowerOfTwo64.c
new file mode 100644
index 0000000000..52d148c924
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+++ b/OldMdePkg/Library/BaseLib/GetPowerOfTwo64.c
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+/** @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
+  )
+{
+  if (Operand == 0) {
+    return 0;
+  }
+
+  return LShiftU64 (1, HighBitSet64 (Operand));
+}