1 /* ===-- int_math.h - internal math inlines ---------------------------------=== 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 * This file is not part of the interface of this library. 11 * 12 * This file defines substitutes for the libm functions used in some of the 13 * compiler-rt implementations, defined in such a way that there is not a direct 14 * dependency on libm or math.h. Instead, we use the compiler builtin versions 15 * where available. This reduces our dependencies on the system SDK by foisting 16 * the responsibility onto the compiler. 17 * 18 * ===-----------------------------------------------------------------------=== 19 */ 20 21 #ifndef INT_MATH_H 22 #define INT_MATH_H 23 24 #ifndef __has_builtin 25 # define __has_builtin(x) 0 26 #endif 27 28 #if defined(_MSC_VER) && !defined(__clang__) 29 #include <math.h> 30 #include <stdlib.h> 31 #include <ymath.h> 32 #endif 33 34 #if defined(_MSC_VER) && !defined(__clang__) 35 #define CRT_INFINITY INFINITY 36 #else 37 #define CRT_INFINITY __builtin_huge_valf() 38 #endif 39 40 #if defined(_MSC_VER) && !defined(__clang__) 41 #define crt_isfinite(x) _finite((x)) 42 #define crt_isinf(x) !_finite((x)) 43 #define crt_isnan(x) _isnan((x)) 44 #else 45 /* Define crt_isfinite in terms of the builtin if available, otherwise provide 46 * an alternate version in terms of our other functions. This supports some 47 * versions of GCC which didn't have __builtin_isfinite. 48 */ 49 #if __has_builtin(__builtin_isfinite) 50 # define crt_isfinite(x) __builtin_isfinite((x)) 51 #elif defined(__GNUC__) 52 # define crt_isfinite(x) \ 53 __extension__(({ \ 54 __typeof((x)) x_ = (x); \ 55 !crt_isinf(x_) && !crt_isnan(x_); \ 56 })) 57 #elif defined(__lint__) 58 # define crt_isfinite(x) 0 59 #else 60 # error "Do not know how to check for infinity" 61 #endif /* __has_builtin(__builtin_isfinite) */ 62 #define crt_isinf(x) __builtin_isinf((x)) 63 #define crt_isnan(x) __builtin_isnan((x)) 64 #endif /* _MSC_VER */ 65 66 #if defined(_MSC_VER) && !defined(__clang__) 67 #define crt_copysign(x, y) copysign((x), (y)) 68 #define crt_copysignf(x, y) copysignf((x), (y)) 69 #define crt_copysignl(x, y) copysignl((x), (y)) 70 #else 71 #define crt_copysign(x, y) __builtin_copysign((x), (y)) 72 #define crt_copysignf(x, y) __builtin_copysignf((x), (y)) 73 #define crt_copysignl(x, y) __builtin_copysignl((x), (y)) 74 #endif 75 76 #if defined(_MSC_VER) && !defined(__clang__) 77 #define crt_fabs(x) fabs((x)) 78 #define crt_fabsf(x) fabsf((x)) 79 #define crt_fabsl(x) fabs((x)) 80 #else 81 #define crt_fabs(x) __builtin_fabs((x)) 82 #define crt_fabsf(x) __builtin_fabsf((x)) 83 #define crt_fabsl(x) __builtin_fabsl((x)) 84 #endif 85 86 #if defined(_MSC_VER) && !defined(__clang__) 87 #define crt_fmax(x, y) __max((x), (y)) 88 #define crt_fmaxf(x, y) __max((x), (y)) 89 #define crt_fmaxl(x, y) __max((x), (y)) 90 #else 91 #define crt_fmax(x, y) __builtin_fmax((x), (y)) 92 #define crt_fmaxf(x, y) __builtin_fmaxf((x), (y)) 93 #define crt_fmaxl(x, y) __builtin_fmaxl((x), (y)) 94 #endif 95 96 #if defined(_MSC_VER) && !defined(__clang__) 97 #define crt_logb(x) logb((x)) 98 #define crt_logbf(x) logbf((x)) 99 #define crt_logbl(x) logbl((x)) 100 #else 101 #define crt_logb(x) __builtin_logb((x)) 102 #define crt_logbf(x) __builtin_logbf((x)) 103 #define crt_logbl(x) __builtin_logbl((x)) 104 #endif 105 106 #if defined(_MSC_VER) && !defined(__clang__) 107 #define crt_scalbn(x, y) scalbn((x), (y)) 108 #define crt_scalbnf(x, y) scalbnf((x), (y)) 109 #define crt_scalbnl(x, y) scalbnl((x), (y)) 110 #else 111 #define crt_scalbn(x, y) __builtin_scalbn((x), (y)) 112 #define crt_scalbnf(x, y) __builtin_scalbnf((x), (y)) 113 #define crt_scalbnl(x, y) __builtin_scalbnl((x), (y)) 114 #endif 115 116 #endif /* INT_MATH_H */ 117