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2012-05-05fix definitions of FP_ILOGB constantsRich Felker-2/+2
two issues: (1) the type was wrong (unsigned instead of signed int), and (2) the value of FP_ILOGBNAN should be INT_MIN rather than INT_MAX to match the ABI. this is also much more useful since INT_MAX corresponds to a valid input (infinity). the standard would allow us to set FP_ILOGB0 to -INT_MAX instead of INT_MIN, which would give us distinct values for ilogb(0) and ilogb(NAN), but the benefit seems way too small to justify ignoring the ABI. note that the macro is just a "portable" (to any twos complement system where signed and unsigned int have the same width) way to write INT_MIN without needing limits.h. it's valid to use this method since these macros are not required to work in #if directives.
2012-05-01support alternate glibc name pow10 for exp10Rich Felker-0/+3
2012-04-30first try at writing an efficient and "correct" exp10Rich Felker-0/+4
this is a nonstandard function so it's not clear what conditions it should satisfy. my intent is that it be fast and exact for positive integral exponents when the result fits in the destination type, and fast and correctly rounded for small negative integral exponents. otherwise we aim for at most 1ulp error; it seems to differ from pow by at most 1ulp and it's often 2-5 times faster than pow.
2012-04-18fix incorrect macro name for MATH_ERREXCEPT in math.hRich Felker-1/+1
2012-03-30optimize signbit macroRich Felker-2/+2
2012-03-30make math.h more c++-friendlyRich Felker-2/+5
2012-03-17move nonstandard gamma() etc. to _GNU_SOURCE onlyRich Felker-4/+4
it's not even provided in the library at the moment, but could easily be provided with weak aliases if desired.
2012-03-17c++ seems to want some casts in the float representation-access macrosRich Felker-2/+2
2012-03-15in math.h make lgamma_r and non-double bessel _GNU_SOURCE onlynsz-20/+18
long double and float bessel functions are no longer xsi extensions
2012-03-15efficient sincos based on sin and cosnsz-0/+4
2012-03-13first commit of the new libm!Rich Felker-9/+64
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.
2012-03-02fix nan/infinity macros in math.h, etc.Rich Felker-6/+8
the previous version not only failed to work in c++, but also failed to produce constant expressions, making the macros useless as initializers for objects of static storage duration. gcc 3.3 and later have builtins for these, which sadly seem to be the most "portable" solution. the alternative definitions produce exceptions (for NAN) and compiler warnings (for INFINITY) on newer versions of gcc.
2012-03-02typo in math.h c version checkRich Felker-1/+1
2012-03-02make math.h compatibe with c89Rich Felker-1/+5
2012-02-15add float_t and double_t to math.hRich Felker-0/+2
2011-11-10fix all missing instances of __cplusplus checks/extern "C" in headersRich Felker-0/+8
patch by Arvid Picciani (aep)
2011-06-08isgreater etc. relation macros for math.hRich Felker-0/+18
2011-02-14extensive header cleanup for standards conformance & correctnessRich Felker-17/+19
thanks to Peter Mazinger (psm) for pointing many of these issues out and submitting a patch on which this commit is loosely based
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker-0/+300
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