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57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Define a hexfloat literal emulator since we can't depend on being able to
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// for hexfloat literals
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// 0x10.F5p-10 == hexfloat<double>(0x10, 0xF5, -10)
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#ifndef HEXFLOAT_H
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#define HEXFLOAT_H
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#include <cmath>
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#include <climits>
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template <class T>
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class hexfloat
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{
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T value_;
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static int CountLeadingZeros(unsigned long long n) {
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const std::size_t Digits = sizeof(unsigned long long) * CHAR_BIT;
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const unsigned long long TopBit = 1ull << (Digits - 1);
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if (n == 0) return Digits;
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int LeadingZeros = 0;
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while ((n & TopBit) == 0) {
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++LeadingZeros;
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n <<= 1;
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}
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return LeadingZeros;
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}
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public:
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hexfloat(long long m1, unsigned long long m0, int exp)
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{
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const std::size_t Digits = sizeof(unsigned long long) * CHAR_BIT;
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int s = m1 < 0 ? -1 : 1;
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int exp2 = -static_cast<int>(Digits - CountLeadingZeros(m0)/4*4);
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value_ = std::ldexp(m1 + s * std::ldexp(T(m0), exp2), exp);
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}
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operator T() const {return value_;}
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};
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#endif
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