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2012-03-16fix namespace issues for lgamma, etc.Rich Felker7-14/+25
standard functions cannot depend on nonstandard symbols
2012-03-16remove junk sincos implementations in preparation to merge nsz's real onesRich Felker4-27/+0
2012-03-16revert COPYRIGHT file changes in preparation to merge nsz's math branchRich Felker1-4/+5
2012-03-16update copyright status (math library and new year)Rich Felker1-6/+5
2012-03-15remove special nan handling from x86 sqrt asmRich Felker1-3/+0
a double precision nan, when converted to extended (80-bit) precision, will never end in 0x400, since the corresponding bits do not exist in the original double precision value. thus there's no need to waste time and code size on this check.
2012-03-15simplify nan check in sqrt (x86 asm); result of sqrt is never negativeRich Felker1-4/+3
2012-03-15in math.h make lgamma_r and non-double bessel _GNU_SOURCE onlynsz4-20/+21
long double and float bessel functions are no longer xsi extensions
2012-03-15efficient sincos based on sin and cosnsz5-8/+251
2012-03-15implement sincosf and sincosl functions; add prototypesRich Felker3-0/+19
presumably broken gcc may generate calls to these, and it's said that ffmpeg makes use of sincosf.
2012-03-15avoid changing NaNs in sqrt (x86 asm) to satisfy c99 f.9 recommendationRich Felker1-0/+4
2012-03-15correctly rounded sqrt() asm for x86 (i387)Rich Felker1-0/+16
the fsqrt opcode is correctly rounded, but only in the fpu's selected precision mode, which is 80-bit extended precision. to get a correctly rounded double precision output, we check for the only corner cases where two-step rounding could give different results than one-step (extended-precision mantissa ending in 0x400) and adjust the mantissa slightly in the opposite direction of the rounding which the fpu already did (reported in the c1 flag of the fpu status word). this should have near-zero cost in the non-corner cases and at worst very low cost. note that in order for sqrt() to get used when compiling with gcc, the broken, non-conformant builtin sqrt must be disabled.
2012-03-13correct rounding for i387 sqrtf functionRich Felker1-0/+2
2012-03-13math cleanup: use 1.0f instead of 1.0Fnsz4-6/+6
2012-03-13math cleanup: use 1.0f instead of (float)1.0nsz25-96/+96
2012-03-13remove libm.h includes when math.h and float.h are enoughnsz31-30/+47
2012-03-13fix scanf handling of "0" (followed by immediate EOF) with "%x"Rich Felker1-11/+6
other cases with %x were probably broken too. I would actually like to go ahead and replace this code in scanf with calls to the new __intparse framework, but for now this calls for a quick and unobtrusive fix without the risk of breaking other things.
2012-03-13clean up __expo2.c, use a slightly better k constantnsz2-84/+14
2012-03-13fix copyright notice for the math libnsz1-5/+9
2012-03-13implement nan, nanf, nanlRich Felker3-0/+18
2012-03-13first commit of the new libm!Rich Felker378-7738/+20547
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.