| //===-- Bit patterns of common floating point numbers -----------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIBC_UTILS_FPUTIL_BIT_PATTERNS_H |
| #define LLVM_LIBC_UTILS_FPUTIL_BIT_PATTERNS_H |
| |
| #include "FloatProperties.h" |
| |
| #include <float.h> |
| |
| static_assert( |
| FLT_RADIX == 2, |
| "LLVM libc only supports radix 2 IEEE 754 floating point formats."); |
| |
| namespace __llvm_libc { |
| namespace fputil { |
| |
| template <typename T> struct BitPatterns {}; |
| |
| template <> struct BitPatterns<float> { |
| using BitsType = FloatProperties<float>::BitsType; |
| |
| static constexpr BitsType inf = 0x7f800000U; |
| static constexpr BitsType negInf = 0xff800000U; |
| |
| static constexpr BitsType zero = 0x0; |
| static constexpr BitsType negZero = 0x80000000U; |
| |
| static constexpr BitsType one = 0x3f800000U; |
| |
| // Examples of quiet NAN. |
| static constexpr BitsType aQuietNaN = 0x7fc00000U; |
| static constexpr BitsType aNegativeQuietNaN = 0xffc00000U; |
| |
| // Examples of signalling NAN. |
| static constexpr BitsType aSignallingNaN = 0x7f800001U; |
| static constexpr BitsType aNegativeSignallingNaN = 0xff800001U; |
| }; |
| |
| template <> struct BitPatterns<double> { |
| using BitsType = FloatProperties<double>::BitsType; |
| |
| static constexpr BitsType inf = 0x7ff0000000000000ULL; |
| static constexpr BitsType negInf = 0xfff0000000000000ULL; |
| |
| static constexpr BitsType zero = 0x0ULL; |
| static constexpr BitsType negZero = 0x8000000000000000ULL; |
| |
| static constexpr BitsType one = 0x3FF0000000000000ULL; |
| |
| // Examples of quiet NAN. |
| static constexpr BitsType aQuietNaN = 0x7ff8000000000000ULL; |
| static constexpr BitsType aNegativeQuietNaN = 0xfff8000000000000ULL; |
| |
| // Examples of signalling NAN. |
| static constexpr BitsType aSignallingNaN = 0x7ff0000000000001ULL; |
| static constexpr BitsType aNegativeSignallingNaN = 0xfff0000000000001ULL; |
| }; |
| |
| } // namespace fputil |
| } // namespace __llvm_libc |
| |
| #endif // LLVM_LIBC_UTILS_FPUTIL_BIT_PATTERNS_H |