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      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