From bd5969fc876a10b18613302db7087ef3c40f18e1 Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Thu, 7 Mar 2024 17:28:00 -0500 Subject: lib: Add mlibc Signed-off-by: Ian Moffett --- lib/mlibc/options/ansi/musl-generic-math/acoshl.c | 29 +++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 lib/mlibc/options/ansi/musl-generic-math/acoshl.c (limited to 'lib/mlibc/options/ansi/musl-generic-math/acoshl.c') diff --git a/lib/mlibc/options/ansi/musl-generic-math/acoshl.c b/lib/mlibc/options/ansi/musl-generic-math/acoshl.c new file mode 100644 index 0000000..8d4b43f --- /dev/null +++ b/lib/mlibc/options/ansi/musl-generic-math/acoshl.c @@ -0,0 +1,29 @@ +#include "libm.h" + +#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 +long double acoshl(long double x) +{ + return acosh(x); +} +#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384 +/* acosh(x) = log(x + sqrt(x*x-1)) */ +long double acoshl(long double x) +{ + union ldshape u = {x}; + int e = u.i.se & 0x7fff; + + if (e < 0x3fff + 1) + /* |x| < 2, invalid if x < 1 or nan */ + return log1pl(x-1 + sqrtl((x-1)*(x-1)+2*(x-1))); + if (e < 0x3fff + 32) + /* |x| < 0x1p32 */ + return logl(2*x - 1/(x+sqrtl(x*x-1))); + return logl(x) + 0.693147180559945309417232121458176568L; +} +#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384 +// TODO: broken implementation to make things compile +long double acoshl(long double x) +{ + return acosh(x); +} +#endif -- cgit v1.2.3