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* math: add dummy implementations of 128 bit long double functionsSzabolcs Nagy2015-03-111-2/+8
| | | | | | | | This is in preparation for the aarch64 port only to have the long double math symbols available on ld128 platforms. The implementations should be fixed up later once we have proper tests for these functions. Added bigendian handling for ld128 bit manipulations too.
* math: lgamma cleanup (simpler sin(pi*x) for the negative case)Szabolcs Nagy2013-11-211-60/+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
* math: remove a useless assignment in lgammal found by clang analyzerSzabolcs Nagy2013-10-041-2/+2
| | | | the issue was reported by Alexander Monakov
* math: remove libc.h include from libm.hSzabolcs Nagy2013-09-051-0/+1
| | | | libc.h is only for weak_alias so include it directly where it is used
* math: fix remaining old long double code (erfl, fmal, lgammal, scalbnl)Szabolcs Nagy2013-09-051-28/+17
| | | | | in lgammal don't handle 1 and 2 specially, in fma use the new ldshape union instead of ld80 one.
* math: remove comment about aliasing lgamma as gammansz2012-03-271-0/+2
| | | | | It is probably not worth supporting gamma. (it was already deprecated in 4.3BSD)
* code cleanup of named constantsnsz2012-03-191-26/+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).
* other side of the signgam namespace fix: use the internal nameRich Felker2012-03-161-1/+3
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* fix namespace issues for lgamma, etc.Rich Felker2012-03-161-8/+10
| | | | standard functions cannot depend on nonstandard symbols
* in math.h make lgamma_r and non-double bessel _GNU_SOURCE onlynsz2012-03-151-0/+1
| | | | long double and float bessel functions are no longer xsi extensions
* first commit of the new libm!Rich Felker2012-03-131-0/+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.