mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
30 lines
645 B
C++
30 lines
645 B
C++
//===-- Support/MathExtras.h - Useful math functions -------------*- C++ -*--=//
|
|
//
|
|
// 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
|