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2013-11-21math: lgamma cleanup (simpler sin(pi*x) for the negative case)Szabolcs Nagy1-60/+28
* simplify sin_pi(x) (don't care about inexact here, the result is inexact anyway, and x is not so small to underflow) * in lgammal add the previously removed special case for x==1 and x==2 (to fix the sign of zero in downward rounding mode) * only define lgammal on supported long double platforms * change tgamma so the generated code is a bit smaller
2013-10-04math: remove a useless assignment in lgammal found by clang analyzerSzabolcs Nagy1-2/+2
the issue was reported by Alexander Monakov
2013-09-05math: remove libc.h include from libm.hSzabolcs Nagy1-0/+1
libc.h is only for weak_alias so include it directly where it is used
2013-09-05math: fix remaining old long double code (erfl, fmal, lgammal, scalbnl)Szabolcs Nagy1-28/+17
in lgammal don't handle 1 and 2 specially, in fma use the new ldshape union instead of ld80 one.
2012-03-27math: remove comment about aliasing lgamma as gammansz1-0/+2
It is probably not worth supporting gamma. (it was already deprecated in 4.3BSD)
2012-03-19code cleanup of named constantsnsz1-26/+22
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).
2012-03-16other side of the signgam namespace fix: use the internal nameRich Felker1-1/+3
2012-03-16fix namespace issues for lgamma, etc.Rich Felker1-8/+10
standard functions cannot depend on nonstandard symbols
2012-03-15in math.h make lgamma_r and non-double bessel _GNU_SOURCE onlynsz1-0/+1
long double and float bessel functions are no longer xsi extensions
2012-03-13first commit of the new libm!Rich Felker1-0/+393
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.