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2012-03-15simplify nan check in sqrt (x86 asm); result of sqrt is never negativeRich Felker-4/+3
2012-03-15avoid changing NaNs in sqrt (x86 asm) to satisfy c99 f.9 recommendationRich Felker-0/+4
2012-03-15correctly rounded sqrt() asm for x86 (i387)Rich Felker-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 Felker-0/+2
2012-03-13implement nan, nanf, nanlRich Felker-0/+18
2012-03-13first commit of the new libm!Rich Felker-7726/+17926
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.
2011-06-30fix error in previous ld80 fpclassify commitRich Felker-1/+1
2011-06-30catch invalid ld80 bit patterns and treat them as nanRich Felker-2/+2
this should not be necessary - the invalid bit patterns cannot be created except through type punning. however, some broken gnu software is passing them to printf and triggering dangerous stack-smashing, so let's catch them anyway...
2011-06-26type directives for x86_64 math asmRich Felker-0/+2
2011-06-26use .type directives for math asm (needed for dynamic linking to work)Rich Felker-0/+26
2011-02-15Port musl to x86-64. One giant commit!Nicholas J. Kain-0/+6
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker-0/+8566