llvm-6502/include/llvm/Support/MathExtras.h
John Criswell b2109ce978 Added LLVM notice.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9300 91177308-0d34-0410-b5e6-96231b3b80d8
2003-10-20 19:46:57 +00:00

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952 B
C++

//===-- Support/MathExtras.h - Useful math functions ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains some functions that are useful for math stuff.
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_MATHEXTRAS_H
#define SUPPORT_MATHEXTRAS_H
#include "Support/DataTypes.h"
inline unsigned log2(uint64_t C) {
unsigned getPow;
for (getPow = 0; C > 1; ++getPow)
C >>= 1;
return getPow;
}
inline bool isPowerOf2(int64_t C, unsigned &getPow) {
if (C < 0) C = -C;
if (C > 0 && C == (C & ~(C - 1))) {
getPow = log2((uint64_t)C);
return true;
}
return false;
}
#endif