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* math: add dummy implementations of 128 bit long double functionsSzabolcs Nagy2015-03-111-0/+6
| | | | | | | | 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: fix underflow in exp*.c and long double handling in exp2lSzabolcs Nagy2013-09-051-1/+1
| | | | | | | | | | | | * don't care about inexact flag * use double_t and float_t (faster, smaller, more precise on x86) * exp: underflow when result is zero or subnormal and not -inf * exp2: underflow when result is zero or subnormal and not exact * expm1: underflow when result is zero or subnormal * expl: don't underflow on -inf * exp2: fix incorrect comment * expm1: simplify special case handling and overflow properly * expm1: cleanup final scaling and fix negative left shift ub (twopk)
* math: expl.c cleanupSzabolcs Nagy2012-11-181-24/+19
| | | | raise overflow and underflow when necessary, fix various comments.
* use scalbn or *2.0 instead of ldexp, fix fmalnsz2012-03-191-4/+4
| | | | | | | | | | | | | 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.
* fix loads of missing const in new libm, and some global vars (?!) in powlRich Felker2012-03-181-2/+2
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* first commit of the new libm!Rich Felker2012-03-131-0/+127
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.