1 //===-- Bit patterns of common floating point numbers -----------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLVM_LIBC_UTILS_FPUTIL_BIT_PATTERNS_H 10 #define LLVM_LIBC_UTILS_FPUTIL_BIT_PATTERNS_H 11 12 #include "FloatProperties.h" 13 14 #include <float.h> 15 16 static_assert( 17 FLT_RADIX == 2, 18 "LLVM libc only supports radix 2 IEEE 754 floating point formats."); 19 20 namespace __llvm_libc { 21 namespace fputil { 22 23 template <typename T> struct BitPatterns {}; 24 25 template <> struct BitPatterns<float> { 26 using BitsType = FloatProperties<float>::BitsType; 27 28 static constexpr BitsType inf = 0x7f800000U; 29 static constexpr BitsType negInf = 0xff800000U; 30 31 static constexpr BitsType zero = 0x0; 32 static constexpr BitsType negZero = 0x80000000U; 33 34 static constexpr BitsType one = 0x3f800000U; 35 36 // Examples of quiet NAN. 37 static constexpr BitsType aQuietNaN = 0x7fc00000U; 38 static constexpr BitsType aNegativeQuietNaN = 0xffc00000U; 39 40 // Examples of signalling NAN. 41 static constexpr BitsType aSignallingNaN = 0x7f800001U; 42 static constexpr BitsType aNegativeSignallingNaN = 0xff800001U; 43 }; 44 45 template <> struct BitPatterns<double> { 46 using BitsType = FloatProperties<double>::BitsType; 47 48 static constexpr BitsType inf = 0x7ff0000000000000ULL; 49 static constexpr BitsType negInf = 0xfff0000000000000ULL; 50 51 static constexpr BitsType zero = 0x0ULL; 52 static constexpr BitsType negZero = 0x8000000000000000ULL; 53 54 static constexpr BitsType one = 0x3FF0000000000000ULL; 55 56 // Examples of quiet NAN. 57 static constexpr BitsType aQuietNaN = 0x7ff8000000000000ULL; 58 static constexpr BitsType aNegativeQuietNaN = 0xfff8000000000000ULL; 59 60 // Examples of signalling NAN. 61 static constexpr BitsType aSignallingNaN = 0x7ff0000000000001ULL; 62 static constexpr BitsType aNegativeSignallingNaN = 0xfff0000000000001ULL; 63 }; 64 65 } // namespace fputil 66 } // namespace __llvm_libc 67 68 #endif // LLVM_LIBC_UTILS_FPUTIL_BIT_PATTERNS_H 69