lib/int_math.h

   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 */