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 
22 template <class T>
23 class hexfloat
24 {
25     T value_;
26 public:
hexfloat(long long m1,unsigned long long m0,int exp)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 
T()35     operator T() const {return value_;}
36 };
37 
38 #endif
39