gcc/d/dmd/root/ctfloat.d

   1 /**
   2  * Collects functions for compile-time floating-point calculations.
   3  *
   4  * Copyright:   Copyright (C) 1999-2024 by The D Language Foundation, All Rights Reserved
   5  * Authors:     $(LINK2 https://www.digitalmars.com, Walter Bright)
   6  * License:     $(LINK2 https://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
   7  * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/root/ctfloat.d, root/_ctfloat.d)
   8  * Documentation: https://dlang.org/phobos/dmd_root_ctfloat.html
   9  * Coverage:    https://codecov.io/gh/dlang/dmd/src/master/src/dmd/root/ctfloat.d
  10  */
  11
  12 module dmd.root.ctfloat;
  13
  14 nothrow:
  15
  16 // Type used by the front-end for compile-time reals
  17 public import dmd.root.longdouble : real_t = longdouble;
  18
  19 // Compile-time floating-point helper
  20 extern (C++) struct CTFloat
  21 {
  22   nothrow:
  23   @nogc:
  24   @safe:
  25
  26     version (GNU)
  27         enum yl2x_supported = false;
  28     else
  29         enum yl2x_supported = __traits(compiles, core.math.yl2x(1.0L, 2.0L));
  30     enum yl2xp1_supported = yl2x_supported;
  31
  32     pure static real_t fabs(real_t x);
  33     pure static real_t ldexp(real_t n, int exp);
  34
  35     pure @trusted
  36     static bool isIdentical(real_t a, real_t b);
  37
  38     pure @trusted
  39     static size_t hash(real_t a);
  40
  41     pure
  42     static bool isNaN(real_t r);
  43
  44     pure @trusted
  45     static bool isSNaN(real_t r);
  46
  47     static bool isInfinity(real_t r) pure;
  48
  49     @system
  50     static real_t parse(const(char)* literal, out bool isOutOfRange);
  51
  52     @system
  53     static int sprint(char* str, size_t size, char fmt, real_t x);
  54
  55     // Constant real values 0, 1, -1 and 0.5.
  56     __gshared real_t zero;
  57     __gshared real_t one;
  58     __gshared real_t minusone;
  59     __gshared real_t half;
  60
  61     @trusted
  62     static void initialize();
  63 }