1//===----------------------------------------------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// Define a hexfloat literal emulator since we can't depend on being able to
11//   for hexfloat literals
12
13// 0x10.F5p-10 == hexfloat<double>(0x10, 0xF5, -10)
14
15#ifndef HEXFLOAT_H
16#define HEXFLOAT_H
17
18#include <algorithm>
19#include <cmath>
20#include <climits>
21
22template <class T>
23class hexfloat
24{
25    T value_;
26public:
27    hexfloat(long long m1, unsigned long long m0, int exp)
28    {
29        const std::size_t n = sizeof(unsigned long long) * CHAR_BIT;
30        int s = m1 < 0 ? -1 : 1;
31        value_ = std::ldexp(m1 + s * std::ldexp(T(m0), -static_cast<int>(n -
32                                                     std::__clz(m0)/4*4)), exp);
33    }
34
35    operator T() const {return value_;}
36};
37
38#endif
39