| Commit message (Expand) | Author | Age | Files | Lines |
|---|
| * | try fixing/optimizing x86_64 fenv exception code•••untested; may need followup-fixes.
| Rich Felker | 2012-03-17 | 1 | -18/+23 |
| * | 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 | 2012-03-17 | 1 | -16/+20 |
| * | fix x86_64 fe[gs]etround, analogous to nsz's x86 changes | Rich Felker | 2012-03-17 | 1 | -8/+9 |
| * | minor 387 fenv optimizations | Rich Felker | 2012-03-17 | 1 | -6/+5 |
| * | 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 | 2012-03-17 | 1 | -10/+10 |
| * | one more fenv availability issue: lround | Rich Felker | 2012-03-17 | 1 | -0/+2 |
| * | 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 | 2012-03-16 | 4 | -4/+28 |
| * | other side of the signgam namespace fix: use the internal name | Rich Felker | 2012-03-16 | 3 | -3/+7 |
| * | 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 | 2012-03-16 | 1 | -2/+5 |
| * | fix namespace issues for lgamma, etc.•••standard functions cannot depend on nonstandard symbols
| Rich Felker | 2012-03-16 | 7 | -14/+25 |
| * | Merge remote branch 'nsz/master' | Rich Felker | 2012-03-16 | 66 | -216/+413 |
| |\ |
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| | * | 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 | 2012-03-15 | 3 | -0/+3 |
| | * | efficient sincos based on sin and cos | nsz | 2012-03-15 | 4 | -8/+247 |
| | * | math cleanup: use 1.0f instead of 1.0F | nsz | 2012-03-13 | 4 | -6/+6 |
| | * | math cleanup: use 1.0f instead of (float)1.0 | nsz | 2012-03-13 | 25 | -96/+96 |
| | * | remove libm.h includes when math.h and float.h are enough | nsz | 2012-03-13 | 31 | -30/+47 |
| | * | clean up __expo2.c, use a slightly better k constant | nsz | 2012-03-13 | 2 | -84/+14 |
| * | | remove junk sincos implementations in preparation to merge nsz's real ones | Rich Felker | 2012-03-16 | 3 | -24/+0 |
| * | | 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 | 2012-03-15 | 1 | -3/+0 |
| * | | simplify nan check in sqrt (x86 asm); result of sqrt is never negative | Rich Felker | 2012-03-15 | 1 | -4/+3 |
| * | | 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 | 2012-03-15 | 2 | -0/+16 |
| * | | avoid changing NaNs in sqrt (x86 asm) to satisfy c99 f.9 recommendation | Rich Felker | 2012-03-15 | 1 | -0/+4 |
| * | | 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 | 2012-03-15 | 1 | -0/+16 |
| * | | correct rounding for i387 sqrtf function | Rich Felker | 2012-03-13 | 1 | -0/+2 |
| * | | 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 | 2012-03-13 | 1 | -11/+6 |
| |/ |
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| * | implement nan, nanf, nanl | Rich Felker | 2012-03-13 | 3 | -0/+18 |
| * | 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 | 2012-03-13 | 375 | -7729/+20193 |
| * | fix obscure bug in strtoull reading the highest 16 possible values | Rich Felker | 2012-03-02 | 1 | -1/+1 |
| * | remove debug cruft that was left in getdate | Rich Felker | 2012-03-02 | 1 | -2/+0 |
| * | first try at implementing getdate function | Rich Felker | 2012-03-02 | 1 | -0/+47 |
| * | fix bugs in strptime handling of string day/month names, literals | Rich Felker | 2012-03-02 | 1 | -0/+2 |
| * | implement a64l and l64a (legacy xsi stuff) | Rich Felker | 2012-03-01 | 1 | -0/+26 |
| * | add all missing wchar functions except floating point parsers•••these are mostly untested and adapted directly from corresponding byte
string functions and similar.
| Rich Felker | 2012-03-01 | 11 | -0/+83 |
| * | support null buffer argument to getcwd, auto-allocating behavior•••this is a popular extension some programs depend on, and by using a
temporary buffer and strdup rather than malloc prior to the syscall,
i've avoided the dependency on free and thus minimized the bloat cost
of supporting this feature.
| Rich Felker | 2012-03-01 | 1 | -1/+6 |
| * | implement wcsftime function | Rich Felker | 2012-02-28 | 1 | -0/+32 |
| * | fix pthread_cleanup_pop(1) crash in non-thread-capable, static-linked programs | Rich Felker | 2012-02-28 | 2 | -2/+2 |
| * | work around "signal loses thread pointer" issue with "approach 2"•••this was discussed on the mailing list and no consensus on the
preferred solution was reached, so in anticipation of a release, i'm
just committing a minimally-invasive solution that avoids the problem
by ensuring that multi-threaded-capable programs will always have
initialized the thread pointer before any signal handler can run.
in the long term we may switch to initializing the thread pointer at
program start time whenever the program has the potential to access
any per-thread data.
| Rich Felker | 2012-02-27 | 2 | -2/+8 |
| * | new attempt at working around the gcc 3 visibility bug•••since gcc is failing to generate the necessary ".hidden" directive in
the output asm, generate it explicitly with an __asm__ statement...
| Rich Felker | 2012-02-24 | 3 | -0/+11 |
| * | remove useless attribute visibility from definitions•••this was a failed attempt at working around the gcc 3 visibility bug
affecting x86_64. subsequent patch will address it with an ugly but
working hack.
| Rich Felker | 2012-02-24 | 2 | -2/+2 |
| * | cleanup and work around visibility bug in gcc 3 that affects x86_64•••in gcc 3, the visibility attribute must be placed on both the
declaration and on the definition. if it's omitted from the
definition, the compiler fails to emit the ".hidden" directive in the
assembly, and the linker will either generate textrels (if supported,
such as on i386) or refuse to link (on targets where certain types of
textrels are forbidden or impossible without further assumptions about
memory layout, such as on x86_64).
this patch also unifies the decision about when to use visibility into
libc.h and makes the visibility in the utf-8 state machine tables
based on libc.h rather than a duplicate test.
| Rich Felker | 2012-02-23 | 4 | -12/+15 |
| * | fix (hopefully) PTRACE_TRACEME (command 0) argument handling | Rich Felker | 2012-02-23 | 1 | -2/+2 |
| * | fix for previous incorrect fix of cancellation in dns lookups•••uninitialized file descriptor was being closed on return, causing
stdin to be closed in many cases.
| Rich Felker | 2012-02-23 | 1 | -3/+4 |
| * | fix get_current_dir_name behavior | Rich Felker | 2012-02-17 | 1 | -2/+6 |
| * | add get_current_dir_name function | Rich Felker | 2012-02-17 | 1 | -0/+12 |
| * | fix default nameserver when resolv.conf doesn't exist | Rich Felker | 2012-02-11 | 1 | -1/+2 |
| * | fix illegal goto out of cleanup context in dns lookups | Rich Felker | 2012-02-11 | 1 | -3/+3 |
| * | small fix for new pthread cleanup stuff•••even if pthread_create/exit code is not linked, run flag needs to be
checked and cleanup function potentially run on pop. thus, move the
code to the module that's always linked when pthread_cleanup_push/pop
is used.
| Rich Felker | 2012-02-09 | 2 | -1/+1 |
| * | replace bad cancellation cleanup abi with a sane one•••the old abi was intended to duplicate glibc's abi at the expense of
being ugly and slow, but it turns out glib was not even using that abi
except on non-gcc-compatible compilers (which it doesn't even support)
and was instead using an exceptions-in-c/unwind-based approach whose
abi we could not duplicate anyway without nasty dwarf2/unwind
integration.
the new abi is copied from a very old glibc abi, which seems to still
be supported/present in current glibc. it avoids all unwinding,
whether by sjlj or exceptions, and merely maintains a linked list of
cleanup functions to be called from the context of pthread_exit. i've
made some care to ensure that longjmp out of a cleanup function should
work, even though it is not required to.
this change breaks abi compatibility with programs which were using
pthread cancellation, which is unfortunate, but that's why i'm making
the change now rather than later. considering that most pthread
features have not been usable until recently anyway, i don't see it as
a major issue at this point.
| Rich Felker | 2012-02-09 | 3 | -62/+23 |
| * | document iswspace and remove wrongly-included zwsp character | Rich Felker | 2012-02-09 | 1 | -1/+5 |
| * | fix typo in iswspace space list table | Rich Felker | 2012-02-09 | 1 | -1/+1 |
