Mercurial > mxe-octave
view src/build-msvctools/math/acoshf.c @ 7220:d3087afece14 default tip @
* src/gdal.mk, src/xcb.mk: disable doxygen docs
author | John Donoghue <john.donoghue@ieee.org> |
---|---|
date | Wed, 22 May 2024 10:31:54 -0400 |
parents | f8299bb6c872 |
children |
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#include <math.h> #include <errno.h> #include "fastmath.h" /* acosh(x) = log (x + sqrt(x * x - 1)) */ float acoshf (float x) { if (isnan (x)) return x; if (x < 1.0f) { errno = EDOM; return nan(""); } if (x > 0x1p32f) /* Avoid overflow (and unnecessary calculation when sqrt (x * x - 1) == x). GCC optimizes by replacing the long double M_LN2 const with a fldln2 insn. */ return __fast_log (x) + 6.9314718055994530941723E-1L; /* Since x >= 1, the arg to log will always be greater than the fyl2xp1 limit (approx 0.29) so just use logl. */ return __fast_log (x + __fast_sqrt((x + 1.0) * (x - 1.0))); }