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* math: add fma TODO comments about the underflow issueSzabolcs Nagy2013-05-191-0/+2
| | | | | | | | | The underflow exception is not raised correctly in some cornercases (see previous fma commit), added comments with examples for fmaf, fmal and non-x86 fma. In fmaf store the result before returning so it has the correct precision when FLT_EVAL_METHOD!=0
* math: use '#pragma STDC FENV_ACCESS ON' when fenv is accessedSzabolcs Nagy2012-11-131-0/+1
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* use scalbn or *2.0 instead of ldexp, fix fmalnsz2012-03-191-6/+6
| | | | | | | | | | | | | Some code assumed ldexp(x, 1) is faster than 2.0*x, but ldexp is a wrapper around scalbn which uses multiplications inside, so this optimization is wrong. This commit also fixes fmal which accidentally used ldexp instead of ldexpl loosing precision. There are various additional changes from the work-in-progress const cleanups.
* fmal bug fix: nan input should not raise exceptionnsz2012-03-191-4/+4
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* make fma and lrint functions build without full fenv supportRich Felker2012-03-161-2/+12
| | | | | | | | this is necessary to support archs where fenv is incomplete or unavailable (presently arm). fma, fmal, and the lrint family should work perfectly fine with this change; fmaf is slightly broken with respect to rounding as it depends on non-default rounding modes to do its work.
* first commit of the new libm!Rich Felker2012-03-131-0/+266
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.