mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-28 19:31:58 +00:00
7764f4b2e0
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14339 91177308-0d34-0410-b5e6-96231b3b80d8
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
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"
|
|
|
|
namespace llvm {
|
|
|
|
#if defined(log2)
|
|
# undef log2
|
|
#endif
|
|
|
|
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(static_cast<uint64_t>(C));
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// Platform-independent wrappers for the C99 isnan() function.
|
|
int IsNAN (float f);
|
|
int IsNAN (double d);
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|