Implement selected functions from the C23 math library

[fwyzard]

See ISO/IEC 9899:2024 N3220 working draft, Section 7.12 Mathematics.

Appendix B.11

• int fpclassify(real-floating x)
• int iscanonical(real-floating x)
• int isfinite(real-floating x)
• int isinf(real-floating x)
• int isnan(real-floating x)
• int isnormal(real-floating x)
• int signbit(real-floating x)
• int issignaling(real-floating x)
• int issubnormal(real-floating x)
• int iszero(real-floating x)
• double acos(double x)
• double asin(double x)
• double atan(double x)
• double atan2(double y, double x)
• double cos(double x)
• double sin(double x)
• double tan(double x)
• double acospi(double x)
• double asinpi(double x)
• double atanpi(double x)
• double atan2pi(double y, double x)
• double cospi(double x)
• double sinpi(double x)
• double tanpi(double x)
• double acosh(double x)
• double asinh(double x)
• double atanh(double x)
• double cosh(double x)
• double sinh(double x)
• double tanh(double x)
• double exp(double x)
• double exp10(double x)
• double exp10m1(double x)
• double exp2(double x)
• double exp2m1(double x)
• double expm1(double x)
• double frexp(double value, int *p)
• int ilogb(double x)
• double ldexp(double x, int p)
• long int llogb(double x)
• double log(double x)
• double log10(double x)
• double log10p1(double x)
• double log1p(double x), double logp1(double x)
• double log2(double x)
• double log2p1(double x)
• double logb(double x)
• double modf(double value, double *iptr)
• double scalbn(double x, int n)
• double scalbln(double x, long int n)
• double cbrt(double x)
• double compoundn(double x, long long int n)
• double fabs(double x)
• double hypot(double x, double y)
• double pow(double x, double y)
• double pown(double x, long long int n)
• double powr(double y, double x)
• double rootn(double x, long long int n)
• double rsqrt(double x) (see Add support for rsqrt() and rcp() #44)
• double sqrt(double x)
• double erf(double x)
• double erfc(double x)
• double lgamma(double x)
• double tgamma(double x)
• double ceil(double x)
• double floor(double x)
• double nearbyint(double x)
• double rint(double x)
• long int lrint(double x)
• long long int llrint(double x)
• double round(double x)
• long int lround(double x)
• long long int llround(double x)
• double roundeven(double x)
• double trunc(double x)
• double fromfp(double x, int rnd, unsigned int width)
• double ufromfp(double x, int rnd, unsigned int width)
• double fromfpx(double x, int rnd, unsigned int width)
• double ufromfpx(double x, int rnd, unsigned int width)
• double fmod(double x, double y)
• double remainder(double x, double y)
• double remquo(double x, double y, int *quo)
• double copysign(double x, double y)
• double nan(const char *tagp)
• double nextafter(double x, double y)
• double nextup(double x)
• double nextdown(double x)
• int canonicalize(double *cx, const double *x)
• double fdim(double x, double y)
• double fmax(double x, double y)
• double fmin(double x, double y)
• double fmaximum(double x, double y)
• double fminimum(double x, double y)
• double fmaximum_mag(double x, double y)
• double fminimum_mag(double x, double y)
• double fmaximum_num(double x, double y)
• double fminimum_num(double x, double y)
• double fmaximum_mag_num(double x, double y)
• double fminimum_mag_num(double x, double y)
• double fma(double x, double y, double z)
• int isgreater(real-floating x, real-floating y)
• int isgreaterequal(real-floating x, real-floating y)
• int isless(real-floating x, real-floating y)
• int islessequal(real-floating x, real-floating y)
• int islessgreater(real-floating x, real-floating y)
• int isunordered(real-floating x, real-floating y)
• int iseqsig(real-floating x, real-floating y)