musl/src/math/tanl.c, branch master musl - an implementation of the standard library for Linux-based systems math: long double trigonometric cleanup (cosl, sinl, sincosl, tanl) 2013年09月05日T11:30:08+00:00 Szabolcs Nagy nsz@port70.net 2013年09月03日T18:50:58+00:00 ea9bb95a5b36c0a3d2ed8fb03808745b406c2633 ld128 support was added to internal kernel functions (__cosl, __sinl, __tanl, __rem_pio2l) from freebsd (not tested, but should be a good start for when ld128 arch arrives) __rem_pio2l had some code cleanup, the freebsd ld128 code seems to gather the results of a large reduction with precision loss (fixed the bug but a todo comment was added for later investigation) the old copyright was removed from the non-kernel wrapper functions (cosl, sinl, sincosl, tanl) since these are trivial and the interesting parts and comments had been already rewritten. 
ld128 support was added to internal kernel functions (__cosl, __sinl,
__tanl, __rem_pio2l) from freebsd (not tested, but should be a good
start for when ld128 arch arrives)
__rem_pio2l had some code cleanup, the freebsd ld128 code seems to
gather the results of a large reduction with precision loss (fixed
the bug but a todo comment was added for later investigation)
the old copyright was removed from the non-kernel wrapper functions
(cosl, sinl, sincosl, tanl) since these are trivial and the interesting
parts and comments had been already rewritten.
math: sin cos cleanup 2013年05月18日T14:40:22+00:00 Szabolcs Nagy nsz@port70.net 2013年05月18日T14:40:22+00:00 bfda37935867f9bf271d6074db0accf05c63ad10 * use unsigned arithmetics * use unsigned to store arg reduction quotient (so n&3 is understood) * remove z=0.0 variables, use literal 0 * raise underflow and inexact exceptions properly when x is small * fix spurious underflow in tanl 
* use unsigned arithmetics
* use unsigned to store arg reduction quotient (so n&3 is understood)
* remove z=0.0 variables, use literal 0
* raise underflow and inexact exceptions properly when x is small
* fix spurious underflow in tanl
math: tan cleanups 2013年05月18日T12:34:00+00:00 Szabolcs Nagy nsz@port70.net 2013年05月18日T12:34:00+00:00 1d5ba3bb5a3f55e10db05219638cfcd967d65417 * use unsigned arithmetics on the representation * store arg reduction quotient in unsigned (so n%2 would work like n&1) * use different convention to pass the arg reduction bit to __tan (this argument used to be 1 for even and -1 for odd reduction which meant obscure bithacks, the new n&1 is cleaner) * raise inexact and underflow flags correctly for small x (tanl(x) may still raise spurious underflow for small but normal x) (this exception raising code increases codesize a bit, similar fixes are needed in many other places, it may worth investigating at some point if the inexact and underflow flags are worth raising correctly as this is not strictly required by the standard) * tanf manual reduction optimization is kept for now * tanl code path is cleaned up to follow similar logic to tan and tanf 
* use unsigned arithmetics on the representation
* store arg reduction quotient in unsigned (so n%2 would work like n&1)
* use different convention to pass the arg reduction bit to __tan
 (this argument used to be 1 for even and -1 for odd reduction
 which meant obscure bithacks, the new n&1 is cleaner)
* raise inexact and underflow flags correctly for small x
 (tanl(x) may still raise spurious underflow for small but normal x)
 (this exception raising code increases codesize a bit, similar fixes
 are needed in many other places, it may worth investigating at some
 point if the inexact and underflow flags are worth raising correctly
 as this is not strictly required by the standard)
* tanf manual reduction optimization is kept for now
* tanl code path is cleaned up to follow similar logic to tan and tanf
don't inline __rem_pio2l so the code size is smaller 2012年03月19日T18:26:31+00:00 nsz nsz@port70.net 2012年03月19日T18:26:31+00:00 2e8c8fbe7d65ba0026cb084dc8570d94cbc908ff
first commit of the new libm! 2012年03月13日T05:17:53+00:00 Rich Felker dalias@aerifal.cx 2012年03月13日T05:17:53+00:00 b69f695acedd4ce2798ef9ea28d834ceccc789bd 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. 
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.

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