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2012-03-17fix i386 fegetround and make fesetround fasternsz1-10/+10
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).
2012-03-17one more fenv availability issue: lroundRich Felker1-0/+2
2012-03-16make fma and lrint functions build without full fenv supportRich Felker4-4/+28
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.
2012-03-16other side of the signgam namespace fix: use the internal nameRich Felker3-3/+7
2012-03-16make signgam a weak alias for an internal symbolRich Felker1-2/+5
otherwise, the standard C lgamma function will clobber a symbol in the namespace reserved for the application.
2012-03-16fix namespace issues for lgamma, etc.Rich Felker7-14/+25
standard functions cannot depend on nonstandard symbols
2012-03-16Merge remote branch 'nsz/master'Rich Felker66-216/+413
2012-03-16remove junk sincos implementations in preparation to merge nsz's real onesRich Felker3-24/+0
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 onlynsz3-0/+3
long double and float bessel functions are no longer xsi extensions
2012-03-15efficient sincos based on sin and cosnsz4-8/+247
2012-03-15implement sincosf and sincosl functions; add prototypesRich Felker2-0/+16
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
2012-03-13implement nan, nanf, nanlRich Felker3-0/+18
2012-03-13first commit of the new libm!Rich Felker375-7729/+20193
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.
2012-03-02fix obscure bug in strtoull reading the highest 16 possible valuesRich Felker1-1/+1
2012-03-02remove debug cruft that was left in getdateRich Felker1-2/+0
2012-03-02first try at implementing getdate functionRich Felker1-0/+47
2012-03-02fix bugs in strptime handling of string day/month names, literalsRich Felker1-0/+2
2012-03-01implement a64l and l64a (legacy xsi stuff)Rich Felker1-0/+26
2012-03-01add all missing wchar functions except floating point parsersRich Felker11-0/+83
these are mostly untested and adapted directly from corresponding byte string functions and similar.
2012-03-01support null buffer argument to getcwd, auto-allocating behaviorRich Felker1-1/+6
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.
2012-02-28implement wcsftime functionRich Felker1-0/+32
2012-02-28fix pthread_cleanup_pop(1) crash in non-thread-capable, static-linked programsRich Felker2-2/+2
2012-02-27work around "signal loses thread pointer" issue with "approach 2"Rich Felker2-2/+8
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.
2012-02-24new attempt at working around the gcc 3 visibility bugRich Felker3-0/+11
since gcc is failing to generate the necessary ".hidden" directive in the output asm, generate it explicitly with an __asm__ statement...
2012-02-24remove useless attribute visibility from definitionsRich Felker2-2/+2
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.
2012-02-23cleanup and work around visibility bug in gcc 3 that affects x86_64Rich Felker4-12/+15
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.
2012-02-23fix (hopefully) PTRACE_TRACEME (command 0) argument handlingRich Felker1-2/+2
2012-02-23fix for previous incorrect fix of cancellation in dns lookupsRich Felker1-3/+4
uninitialized file descriptor was being closed on return, causing stdin to be closed in many cases.
2012-02-17fix get_current_dir_name behaviorRich Felker1-2/+6
2012-02-17add get_current_dir_name functionRich Felker1-0/+12
2012-02-11fix default nameserver when resolv.conf doesn't existRich Felker1-1/+2
2012-02-11fix illegal goto out of cleanup context in dns lookupsRich Felker1-3/+3
2012-02-09small fix for new pthread cleanup stuffRich Felker2-1/+1
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.
2012-02-09replace bad cancellation cleanup abi with a sane oneRich Felker3-62/+23
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.
2012-02-09document iswspace and remove wrongly-included zwsp characterRich Felker1-1/+5
2012-02-09fix typo in iswspace space list tableRich Felker1-1/+1
2012-02-07protect against cancellation in dlopenRich Felker1-2/+5
i'm not sure that it's "correct" for dlopen to block cancellation when calling constructors for libraries it loads, but it sure seems like the right thing. in any case, dlopen itself needs cancellation blocked.
2012-02-07reduce some wasted space in dso structureRich Felker1-3/+3
2012-02-06more locale_t interfaces (string stuff) and header updatesRich Felker7-0/+48
this should be everything except for some functions where the non-_l version isn't even implemented yet (mainly some non-ISO-C wcs* functions).
2012-02-06fix some omissions and mistakes in locale_t interface definitionsRich Felker13-13/+13
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