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* math: remove code duplication in erfl found by clang analyzerSzabolcs Nagy2013-10-041-13/+2
| | | | | erfl had some superflous code left around after the last erf cleanup. the issue was reported by Alexander Monakov
* math: fix remaining old long double code (erfl, fmal, lgammal, scalbnl)Szabolcs Nagy2013-09-051-23/+14
| | | | | in lgammal don't handle 1 and 2 specially, in fma use the new ldshape union instead of ld80 one.
* add missing erfcl wrapper for archs where long double is plain doubleRich Felker2013-07-281-0/+4
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* math: erf and erfc cleanupSzabolcs Nagy2013-01-071-111/+84
| | | | | | | | | | | | common part of erf and erfc was put in a separate function which saved some space and the new code is using unsigned arithmetics erfcf had a bug: for some inputs in [7.95,8] the result had more than 60ulp error: in expf(-z*z - 0.5625f) the argument must be exact but not enough lowbits of z were zeroed, -SET_FLOAT_WORD(z, ix&0xfffff000); +SET_FLOAT_WORD(z, ix&0xffffe000); fixed the issue
* code cleanup of named constantsnsz2012-03-191-29/+25
| | | | | | | 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).
* fix erfl wrapper for long double==double casensz2012-03-191-1/+1
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* first commit of the new libm!Rich Felker2012-03-131-0/+390
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.