llvm-6502/include/Support/MathExtras.h
2002-09-17 23:56:50 +00:00

30 lines
647 B
C++

//===-- Support/MathExtras.h - Useful math functions -------------*- C++ -*--=//
//
// This file contains some functions that are useful for math stuff.
//
//===----------------------------------------------------------------------===//
#ifndef SUPPORT_MATH_EXTRAS_H
#define SUPPORT_MATH_EXTRAS_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