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: 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
