UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[mirror_edk2.git] / MdePkg / Library / BaseLib / GetPowerOfTwo64.c

/** @file\r
  Math worker functions.\r
\r
  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "BaseLibInternals.h"\r
\r
/**\r
  Returns the value of the highest bit set in a 64-bit value. Equivalent to\r
  1 << log2(x).\r
\r
  This function computes the value of the highest bit set in the 64-bit value\r
  specified by Operand. If Operand is zero, then zero is returned.\r
\r
  @param  Operand The 64-bit operand to evaluate.\r
\r
  @return 1 << HighBitSet64(Operand)\r
  @retval 0 Operand is zero.\r
\r
**/\r
UINT64\r
EFIAPI\r
GetPowerOfTwo64 (\r
  IN      UINT64  Operand\r
  )\r
{\r
  if (Operand == 0) {\r
    return 0;\r
  }\r
\r
  return LShiftU64 (1, (UINTN)HighBitSet64 (Operand));\r
}\r