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* math: clean up inverse trigonometric functionsSzabolcs Nagy2012-12-111-35/+26
| | | | | | | | | | | | | modifications: * avoid unsigned->signed conversions * removed various volatile hacks * use FORCE_EVAL when evaluating only for side-effects * factor out R() rational approximation instead of manual inline * __invtrigl.h now only provides __invtrigl_R, __pio2_hi and __pio2_lo * use 2*pio2_hi, 2*pio2_lo instead of pi_hi, pi_lo otherwise the logic is not changed, long double versions will need a revisit when a genaral long double cleanup happens
* math: ld80 invtrig cleanupsSzabolcs Nagy2012-11-141-5/+4
| | | | keeping only commonly used data in invtrigl
* code cleanup of named constantsnsz2012-03-191-3/+2
| | | | | | | 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).
* remove long double const workaroundsnsz2012-03-191-13/+1
| | | | | | | | Some long double consts were stored in two doubles as a workaround for x86_64 and i386 with the following comment: /* Long double constants are slow on these arches, and broken on i386. */ This is most likely old gcc bug related to the default x87 fpu precision setting (it's double instead of double extended on BSD).
* fix loads of missing const in new libm, and some global vars (?!) in powlRich Felker2012-03-181-1/+1
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* first commit of the new libm!Rich Felker2012-03-131-0/+91
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.