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 #define CRT_INFINITY __builtin_huge_valf() 29 30 #define crt_isinf(x) __builtin_isinf((x)) 31 #define crt_isnan(x) __builtin_isnan((x)) 32 33 /* Define crt_isfinite in terms of the builtin if available, otherwise provide 34 * an alternate version in terms of our other functions. This supports some 35 * versions of GCC which didn't have __builtin_isfinite. 36 */ 37 #if __has_builtin(__builtin_isfinite) 38 # define crt_isfinite(x) __builtin_isfinite((x)) 39 #else 40 # define crt_isfinite(x) \ 41 __extension__(({ \ 42 __typeof((x)) x_ = (x); \ 43 !crt_isinf(x_) && !crt_isnan(x_); \ 44 })) 45 #endif 46 47 #define crt_copysign(x, y) __builtin_copysign((x), (y)) 48 #define crt_copysignf(x, y) __builtin_copysignf((x), (y)) 49 #define crt_copysignl(x, y) __builtin_copysignl((x), (y)) 50 51 #define crt_fabs(x) __builtin_fabs((x)) 52 #define crt_fabsf(x) __builtin_fabsf((x)) 53 #define crt_fabsl(x) __builtin_fabsl((x)) 54 55 #define crt_fmax(x, y) __builtin_fmax((x), (y)) 56 #define crt_fmaxf(x, y) __builtin_fmaxf((x), (y)) 57 #define crt_fmaxl(x, y) __builtin_fmaxl((x), (y)) 58 59 #define crt_logb(x) __builtin_logb((x)) 60 #define crt_logbf(x) __builtin_logbf((x)) 61 #define crt_logbl(x) __builtin_logbl((x)) 62 63 #define crt_scalbn(x, y) __builtin_scalbn((x), (y)) 64 #define crt_scalbnf(x, y) __builtin_scalbnf((x), (y)) 65 #define crt_scalbnl(x, y) __builtin_scalbnl((x), (y)) 66 67 #endif /* INT_MATH_H */ 68