Maintainers.txt: Remove EdkCompatibilityPkg information

[mirror_edk2.git] / EdkCompatibilityPkg / Foundation / Library / EfiCommonLib / Ia32 / GetPowerOfTwo.c

/*++\r
\r
Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials                          \r
are licensed and made available under the terms and conditions of the BSD License         \r
which accompanies this distribution.  The full text of the license may be found at        \r
http://opensource.org/licenses/bsd-license.php                                            \r
                                                                                          \r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
\r
Module Name:\r
\r
  GetPowerOfTwo.c\r
\r
Abstract:\r
\r
  Calculates the largest integer that is both \r
  a power of two and less than Input\r
\r
--*/\r
\r
#include "Tiano.h"\r
\r
UINT64\r
GetPowerOfTwo (\r
  IN UINT64   Input\r
  )\r
/*++\r
\r
Routine Description:\r
\r
  Calculates the largest integer that is both \r
  a power of two and less than Input\r
\r
Arguments:\r
\r
  Input  - value to calculate power of two\r
\r
Returns:\r
\r
  the largest integer that is both  a power of \r
  two and less than Input\r
\r
--*/\r
{\r
  __asm {\r
    xor     eax, eax\r
    mov     edx, eax\r
    mov     ecx, dword ptr Input[4]\r
    jecxz   _F\r
    bsr     ecx, ecx\r
    bts     edx, ecx\r
    jmp     _Exit\r
_F:\r
    mov     ecx, dword ptr Input[0]\r
    jecxz   _Exit\r
    bsr     ecx, ecx\r
    bts     eax, ecx\r
_Exit:\r
  }\r
}\r