1 //===-- int_math.h - internal math inlines --------------------------------===// 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 // This file is not part of the interface of this library. 10 // 11 // This file defines substitutes for the libm functions used in some of the 12 // compiler-rt implementations, defined in such a way that there is not a direct 13 // dependency on libm or math.h. Instead, we use the compiler builtin versions 14 // where available. This reduces our dependencies on the system SDK by foisting 15 // the responsibility onto the compiler. 16 // 17 //===----------------------------------------------------------------------===// 18 19 #ifndef INT_MATH_H 20 #define INT_MATH_H 21 22 #ifndef __has_builtin 23 #define __has_builtin(x) 0 24 #endif 25 26 #if defined(_MSC_VER) && !defined(__clang__) 27 #include <math.h> 28 #include <stdlib.h> 29 #endif 30 31 #if defined(_MSC_VER) && !defined(__clang__) 32 #define CRT_INFINITY INFINITY 33 #else 34 #define CRT_INFINITY __builtin_huge_valf() 35 #endif 36 37 #if defined(_MSC_VER) && !defined(__clang__) 38 #define crt_isfinite(x) _finite((x)) 39 #define crt_isinf(x) !_finite((x)) 40 #define crt_isnan(x) _isnan((x)) 41 #else 42 // Define crt_isfinite in terms of the builtin if available, otherwise provide 43 // an alternate version in terms of our other functions. This supports some 44 // versions of GCC which didn't have __builtin_isfinite. 45 #if __has_builtin(__builtin_isfinite) 46 #define crt_isfinite(x) __builtin_isfinite((x)) 47 #elif defined(__GNUC__) 48 #define crt_isfinite(x) \ 49 __extension__(({ \ 50 __typeof((x)) x_ = (x); \ 51 !crt_isinf(x_) && !crt_isnan(x_); \ 52 })) 53 #else 54 #error "Do not know how to check for infinity" 55 #endif // __has_builtin(__builtin_isfinite) 56 #define crt_isinf(x) __builtin_isinf((x)) 57 #define crt_isnan(x) __builtin_isnan((x)) 58 #endif // _MSC_VER 59 60 #if defined(_MSC_VER) && !defined(__clang__) 61 #define crt_copysign(x, y) copysign((x), (y)) 62 #define crt_copysignf(x, y) copysignf((x), (y)) 63 #define crt_copysignl(x, y) copysignl((x), (y)) 64 #else 65 #define crt_copysign(x, y) __builtin_copysign((x), (y)) 66 #define crt_copysignf(x, y) __builtin_copysignf((x), (y)) 67 #define crt_copysignl(x, y) __builtin_copysignl((x), (y)) 68 #endif 69 70 #if defined(_MSC_VER) && !defined(__clang__) 71 #define crt_fabs(x) fabs((x)) 72 #define crt_fabsf(x) fabsf((x)) 73 #define crt_fabsl(x) fabs((x)) 74 #else 75 #define crt_fabs(x) __builtin_fabs((x)) 76 #define crt_fabsf(x) __builtin_fabsf((x)) 77 #define crt_fabsl(x) __builtin_fabsl((x)) 78 #endif 79 80 #if defined(_MSC_VER) && !defined(__clang__) 81 #define crt_fmaxl(x, y) __max((x), (y)) 82 #else 83 #define crt_fmaxl(x, y) __builtin_fmaxl((x), (y)) 84 #endif 85 86 #if defined(_MSC_VER) && !defined(__clang__) 87 #define crt_logbl(x) logbl((x)) 88 #else 89 #define crt_logbl(x) __builtin_logbl((x)) 90 #endif 91 92 #if defined(_MSC_VER) && !defined(__clang__) 93 #define crt_scalbnl(x, y) scalbnl((x), (y)) 94 #else 95 #define crt_scalbnl(x, y) __builtin_scalbnl((x), (y)) 96 #endif 97 98 #endif // INT_MATH_H 99