| Commit message (Expand) | Author | Files | Lines |
|---|
| 2012-03-18 | assembly optimizations for fmod/remainder functions | Rich Felker | 8 | -0/+88 |
| 2012-03-18 | asm versions of some simple math functions for i386 and x86_64•••these are functions that have direct fpu approaches to implementation
without problematic exception or rounding issues. x86_64 lacks
float/double versions because i'm unfamiliar with the necessary sse
code for performing these operations.
| Rich Felker | 8 | -0/+48 |
| 2012-03-18 | simplify lround and llround functions•••Simple wrappers around round is enough because
spurious inexact exception is allowed.
| nsz | 6 | -112/+20 |
| 2012-03-18 | make lrint and llrint functions work without fenv support | nsz | 6 | -6/+16 |
| 2012-03-18 | faster lrint and llrint functions•••A faster workaround for spurious inexact exceptions
when the result cannot be represented. The old code
actually could be wrong, because gcc reordered the
integer conversion and the exception check.
| nsz | 6 | -80/+99 |
| 2012-03-18 | fix loads of missing const in new libm, and some global vars (?!) in powl | Rich Felker | 20 | -51/+51 |
| 2012-03-17 | move nonstandard gamma() etc. to _GNU_SOURCE only•••it's not even provided in the library at the moment, but could easily
be provided with weak aliases if desired.
| Rich Felker | 1 | -4/+4 |
| 2012-03-17 | c++ seems to want some casts in the float representation-access macros | Rich Felker | 1 | -2/+2 |
| 2012-03-17 | release notes for 0.8.7 | Rich Felker | 1 | -0/+24 |
| 2012-03-17 | try fixing/optimizing x86_64 fenv exception code•••untested; may need followup-fixes.
| Rich Felker | 1 | -18/+23 |
| 2012-03-17 | optimize x86 feclearexcept•••if all exception flags will be cleared, we can avoid the expensive
store/reload of the environment and just use the fnclex instruction.
| Rich Felker | 1 | -16/+20 |
| 2012-03-17 | fix x86_64 fe[gs]etround, analogous to nsz's x86 changes | Rich Felker | 1 | -8/+9 |
| 2012-03-17 | minor 387 fenv optimizations | Rich Felker | 1 | -6/+5 |
| 2012-03-17 | fix i386 fegetround and make fesetround faster•••Note that the new fesetround has slightly different semantics:
Storing the floating-point environment with fnstenv makes the
next fldenv (or fldcw) "non-signaling", so unmasked and pending
exceptions does not invoke the exception handler.
(These are rare since exceptions are handled immediately and by
default all exceptions are masked anyway. But if one manually
unmasks an exception in the control word then either sets the
corresponding exception flag in the status word or the execution
of an exception raising floating-point operation gets interrupted
then it may happen).
So the old implementation did not trap in some rare cases
where the new implementation traps.
However POSIX does not specify anything like the x87 exception
handling traps and the fnstenv/fldenv pair is significantly slower
than the fnstcw/fldcw pair (new code is about 5x faster here and
it's dominated by the function call overhead).
| nsz | 1 | -10/+10 |
| 2012-03-17 | don't fail on inability to install dynamic linker (e.g. if not root) | Rich Felker | 1 | -1/+1 |
| 2012-03-17 | one more fenv availability issue: lround | Rich Felker | 1 | -0/+2 |
| 2012-03-16 | make fma and lrint functions build without full fenv support•••this is necessary to support archs where fenv is incomplete or
unavailable (presently arm). fma, fmal, and the lrint family should
work perfectly fine with this change; fmaf is slightly broken with
respect to rounding as it depends on non-default rounding modes to do
its work.
| Rich Felker | 4 | -4/+28 |
| 2012-03-16 | other side of the signgam namespace fix: use the internal name | Rich Felker | 3 | -3/+7 |
| 2012-03-16 | make signgam a weak alias for an internal symbol•••otherwise, the standard C lgamma function will clobber a symbol in the
namespace reserved for the application.
| Rich Felker | 1 | -2/+5 |
| 2012-03-16 | fix namespace issues for lgamma, etc.•••standard functions cannot depend on nonstandard symbols
| Rich Felker | 7 | -14/+25 |
| 2012-03-16 | remove junk sincos implementations in preparation to merge nsz's real ones | Rich Felker | 4 | -27/+0 |
| 2012-03-16 | revert COPYRIGHT file changes in preparation to merge nsz's math branch | Rich Felker | 1 | -4/+5 |
| 2012-03-16 | update copyright status (math library and new year) | Rich Felker | 1 | -6/+5 |
| 2012-03-15 | remove special nan handling from x86 sqrt asm•••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.
| Rich Felker | 1 | -3/+0 |
| 2012-03-15 | simplify nan check in sqrt (x86 asm); result of sqrt is never negative | Rich Felker | 1 | -4/+3 |
| 2012-03-15 | in math.h make lgamma_r and non-double bessel _GNU_SOURCE only•••long double and float bessel functions are no longer xsi extensions
| nsz | 4 | -20/+21 |
| 2012-03-15 | efficient sincos based on sin and cos | nsz | 5 | -8/+251 |
| 2012-03-15 | implement sincosf and sincosl functions; add prototypes•••presumably broken gcc may generate calls to these, and it's said that
ffmpeg makes use of sincosf.
| Rich Felker | 3 | -0/+19 |
| 2012-03-15 | avoid changing NaNs in sqrt (x86 asm) to satisfy c99 f.9 recommendation | Rich Felker | 1 | -0/+4 |
| 2012-03-15 | correctly rounded sqrt() asm for x86 (i387)•••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.
| Rich Felker | 1 | -0/+16 |
| 2012-03-13 | correct rounding for i387 sqrtf function | Rich Felker | 1 | -0/+2 |
| 2012-03-13 | math cleanup: use 1.0f instead of 1.0F | nsz | 4 | -6/+6 |
| 2012-03-13 | math cleanup: use 1.0f instead of (float)1.0 | nsz | 25 | -96/+96 |
| 2012-03-13 | remove libm.h includes when math.h and float.h are enough | nsz | 31 | -30/+47 |
| 2012-03-13 | fix scanf handling of "0" (followed by immediate EOF) with "%x"•••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.
| Rich Felker | 1 | -11/+6 |
| 2012-03-13 | clean up __expo2.c, use a slightly better k constant | nsz | 2 | -84/+14 |
| 2012-03-13 | fix copyright notice for the math lib | nsz | 1 | -5/+9 |
| 2012-03-13 | implement nan, nanf, nanl | Rich Felker | 3 | -0/+18 |
| 2012-03-13 | first commit of the new libm!•••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.
| Rich Felker | 378 | -7738/+20547 |
