mirror/musl - mirror of git://git.musl-libc.org/musl

	Commit message (Collapse)	Author	Age	Files	Lines
*	math: fix acoshf for negative inputs	Szabolcs Nagy	2021-02-10	1	-4/+4
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	on some negative inputs (e.g. -0x1.1e6ae8p+5) acoshf failed to return nan. ensure that negative inputs result nan without introducing new branches. this was tried before in commit 101e6012856918440b5d7474739c3fc22a8d3b85 math: fix acoshf on negative values but that fix was wrong. there are 3 formulas used: log1p(x-1 + sqrt((x-1)(x-1)+2(x-1))) log(2x - 1/(x+sqrt(xx-1))) log(x) + 0.693147180559945309417232121458176568 the first fails on large negative inputs (may compute log1p(0) or log1p(inf)), the second one fails on some mid range or large negative inputs (may compute log(large) or log(inf)) and the last one fails on -0 (returns -inf).
*	math: use sqrtl if FLT_EVAL_METHOD==2 in acosh and acoshf	Szabolcs Nagy	2013-10-07	1	-0/+8
\| \| \| \|	this makes acosh slightly more precise around 1.0 on i386
*	math: fix acoshf on negative values	Szabolcs Nagy	2013-09-05	1	-5/+6
\| \| \| \| \| \|	acosh(x) is invalid for x<1, acoshf tried to be clever using signed comparisions to handle all x<2 the same way, but the formula was wrong on large negative values.
*	math: rewrite inverse hyperbolic functions to be simpler/smaller	Szabolcs Nagy	2012-12-11	1	-36/+11
\| \| \| \| \| \| \| \| \| \| \| \|	modifications: * avoid unsigned->signed integer conversion * do not handle special cases when they work correctly anyway * more strict threshold values (0x1p26 instead of 0x1p28 etc) * smaller code, cleaner branching logic * same precision as the old code: acosh(x) has up to 2ulp error in [1,1.125] asinh(x) has up to 1.6ulp error in [0.125,0.5], [-0.5,-0.125] atanh(x) has up to 1.7ulp error in [0.125,0.5], [-0.5,-0.125]
*	code cleanup of named constants	nsz	2012-03-19	1	-4/+3
\| \| \| \| \| \| \|	zero, one, two, half are replaced by const literals The policy was to use the f suffix for float consts (1.0f), but don't use suffix for long double consts (these consts can be exactly represented as double).
*	math cleanup: use 1.0f instead of (float)1.0	nsz	2012-03-13	1	-2/+2
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*	first commit of the new libm!	Rich Felker	2012-03-13	1	-0/+43
	thanks to the hard work of Szabolcs Nagy (nsz), identifying the best (from correctness and license standpoint) implementations from freebsd and openbsd and cleaning them up! musl should now fully support c99 float and long double math functions, and has near-complete complex math support. tgmath should also work (fully on gcc-compatible compilers, and mostly on any c99 compiler). based largely on commit 0376d44a890fea261506f1fc63833e7a686dca19 from nsz's libm git repo, with some additions (dummy versions of a few missing long double complex functions, etc.) by me. various cleanups still need to be made, including re-adding (if they're correct) some asm functions that were dropped.