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2012-04-11simplify/debloat radix point alignment code in floatscanRich Felker-9/+4
now that this is the first operation, it can rely on the circular buffer contents not being wrapped when it begins. we limit the number of digits read slightly in the initial parsing loops too so that this code does not have to consider the case where it might cause the circular buffer to wrap; this is perfectly fine because KMAX is chosen as a power of two for circular-buffer purposes and is much larger than it otherwise needs to be, anyway. these changes should not affect performance at all.
2012-04-11optimize floatscan: avoid excessive upscalingRich Felker-27/+27
upscaling by even one step too much creates 3-29 extra iterations for the next loop. this is still suboptimal since it always goes by 2^29 rather than using a smaller upscale factor when nearing the target, but performance on common, small-magnitude, few-digit values has already more than doubled with this change. more optimizations on the way...
2012-04-11fix incorrect initial count in shgetc when data is already bufferedRich Felker-1/+1
2012-04-11fix bug parsing lone zero followed by junk, and hex float over-readingRich Felker-6/+5
2012-04-10fix float scanning of certain values ending in zerosRich Felker-1/+3
for example, "1000000000" was being read as "1" due to this loop exiting early. it's necessary to actually update z and zero the entries so that the subsequent rounding code does not get confused; before i did that, spurious inexact exceptions were being raised.
2012-04-10fix potential overflow in exponent readingRich Felker-1/+1
note that there's no need for a precise cutoff, because exponents this large will always result in overflow or underflow (it's impossible to read enough digits to compensate for the exponent magnitude; even at a few nanoseconds per digit it would take hundreds of years).
2012-04-10set errno properly when parsing floating pointRich Felker-4/+21
2012-04-10add "scan helper getc" and rework strtod, etc. to use itRich Felker-75/+115
the immediate benefit is a significant debloating of the float parsing code by moving the responsibility for keeping track of the number of characters read to a different module. by linking shgetc with the stdio buffer logic, counting logic is defered to buffer refill time, keeping the calls to shgetc fast and light. in the future, shgetc will also be useful for integrating the new float code with scanf, which needs to not only count the characters consumed, but also limit the number of characters read based on field width specifiers. shgetc may also become a useful tool for simplifying the integer parsing code.
2012-04-10unify strtof/strtod/strtold wrappers and fix initial whitespace issueRich Felker-34/+21
2012-04-10new floating point parser/converterRich Felker-94/+477
this version is intended to be fully conformant to the ISO C, POSIX, and IEEE standards for conversion of decimal/hex floating point strings to float, double, and long double (ld64 or ld80 only at present) values. in particular, all results are intended to be rounded correctly according to the current rounding mode. further, this implementation aims to set the floating point underflow, overflow, and inexact flags to reflect the conversion performed. a moderate amount of testing has been performed (by nsz and myself) prior to integration of the code in musl, but it still may have bugs. so far, only strto(d|ld|f) use the new code. scanf integration will be done as a separate commit, and i will add implementations of the wide character functions later.
2012-04-09fix alloca issue in stdlib.h tooRich Felker-1/+1
I forgot _GNU_SOURCE also has it declared here...
2012-04-09alloca cannot be a function. #define it to the gcc builtin if possibleRich Felker-0/+4
gcc makes this mapping by default anyway, but it will be disabled by -fno-builtin (and presumably by -std=c99 or similar). for the main program the error will be reported by the linker, and the issue can easily be fixed, but for dynamic-loaded so files, the error cannot be detected until dlopen time, at which point it has become very obscure.
2012-04-04work around nasty gcc bug in the i386 syscall asmRich Felker-4/+4
when the "r" (register) constraint is used to let gcc choose a register, gcc will sometimes assign the same register that was used for one of the other fixed-register operands, if it knows the values are the same. one common case is multiple zero arguments to a syscall. this horribly breaks the intended usage, which is swapping the GOT pointer from ebx into the temp register and back to perform the syscall. presumably there is a way to fix this with advanced usage of register constaints on the inline asm, but having bad memories about hellish compatibility issues with different gcc versions, for the time being i'm just going to hard-code specific registers to be used. this may hurt the compiler's ability to optimize, but it will fix serious miscompilation issues. so far the only function i know what compiled incorrectly is getrlimit.c, and naturally the bug only applies to shared (PIC) builds, but it may be more extensive and may have gone undetected..
2012-04-03remove useless (at best, harmful) feature test checks in aio.hRich Felker-5/+0
2012-04-01improve name lookup performance in corner casesRich Felker-2/+2
the buffer in getaddrinfo really only matters when /etc/hosts is huge, but in that case, the huge number of syscalls resulting from a tiny buffer would seriously impact the performance of every name lookup. the buffer in __dns.c has also been enlarged a bit so that typical resolv.conf files will fit fully in the buffer. there's no need to make it so large as to dominate the syscall overhead for large files, because resolv.conf should never be large.
2012-03-30optimize signbit macroRich Felker-2/+2
2012-03-30make math.h more c++-friendlyRich Felker-2/+5
2012-03-29math: minor cleanups in ceil and floornsz-10/+7
2012-03-29math: remove x86 modf asmnsz-111/+0
the int part was wrong when -1 < x <= -0 (+0.0 instead of -0.0) and the size and performace gain of the asm version was negligible
2012-03-29math: rewrite modf.c and clean up modff.cnsz-72/+45
cleaner implementation with unions and unsigned arithmetic
2012-03-28math: fix modfl.c bugnsz-1/+1
modfl(+-inf) was wrong on ld80 because the explicit msb was not taken into account during inf vs nan check
2012-03-27math: fix a regression in powl and do some cleanupsnsz-12/+11
previously a division was accidentally turned into integer div (w = -i/NXT;) instead of long double div (w = -i; w /= NXT;)
2012-03-27math: add dummy tgamma and tgammaf implementationsnsz-0/+32
2012-03-27math: remove comment about aliasing lgamma as gammansz-8/+4
It is probably not worth supporting gamma. (it was already deprecated in 4.3BSD)
2012-03-27math: fix typo in i386 remquof and remquol asmnsz-5/+5
(fldl instruction was used instead of flds and fldt)
2012-03-26Merge branch 'master' of git://git.etalabs.net/muslnsz-10/+32
2012-03-25Merge remote branch 'nsz/master'Rich Felker-15/+6
2012-03-25add strfmon_l variant (still mostly incomplete)Rich Felker-3/+27
2012-03-24update COPYRIGHT status of TRE regex codeRich Felker-4/+4
2012-03-24update README to remove information no longer relevant as of 0.8.7Rich Felker-3/+1
2012-03-23Merge branch 'master' of git://git.etalabs.net/muslnsz-6/+103
2012-03-23asm for hypot and hypotfRich Felker-0/+87
special care is made to avoid any inexact computations when either arg is zero (in which case the exact absolute value of the other arg should be returned) and to support the special condition that hypot(±inf,nan) yields inf. hypotl is not yet implemented since avoiding overflow is nontrivial.
2012-03-23make dlerror conform to posixRich Felker-6/+16
the error status is required to be sticky after failure of dlopen or dlsym until cleared by dlerror. applications and especially libraries should never rely on this since it is not thread-safe and subject to race conditions, but glib does anyway.
2012-03-23minor rintl.c fix: remove unsupported ldbl format messagensz-2/+0
2012-03-23fix tgammal: don't set the signgam globalnsz-13/+6
(tgamma must be thread-safe, signgam is for lgamma* functions)
2012-03-22simplify creal and cimag macrosRich Felker-8/+8
2012-03-22add creal/cimag macros in complex.h (and use them in the functions defs)Rich Felker-20/+20
2012-03-22tgmath.h: suppress any existing macro definitions before defining macrosRich Felker-0/+63
this is necessary so that we can freely add macro versions of some of the math/complex functions without worrying about breaking tgmath.
2012-03-22acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))nsz-6/+2
the old formula atan2(1,sqrt((1+x)/(1-x))) was faster but could give nan result at x=1 when the rounding mode is FE_DOWNWARD (so 1-1 == -0 and 2/-0 == -inf), the new formula gives -0 at x=+-1 with downward rounding.
2012-03-22sysconf support for dynamic limits (open files and processes)Rich Felker-2/+9
2012-03-21fix DECIMAL_DIG definitionsRich Felker-2/+6
DECIMAL_DIG is not the same as LDBL_DIG type_DIG is the maximimum number of decimal digits that can survive a round trip from decimal to type and back to decimal. DECIMAL_DIG is the minimum number of decimal digits required in order for any floating point type to survive the round trip to decimal and back, and it is generally larger than LDBL_DIG. since the exact formula is non-trivial, and defining it larger than necessary may be legal but wasteful, just define the right value in bits/float.h.
2012-03-21initial, very primitive strfmonRich Felker-0/+98
2012-03-20x86_64 math asm, long double functions onlyRich Felker-0/+239
this has not been tested heavily, but it's known to at least assemble and run in basic usage cases. it's nearly identical to the corresponding i386 code, and thus expected to be just as correct or just as incorrect.
2012-03-20limits.h: support gcc's -funsigned-charRich Felker-2/+10
some software apparently uses this and breaks with musl due to mismatching definitions...
2012-03-20Merge remote branch 'nsz/master'Rich Felker-198/+127
2012-03-20upgrade to latest upstream TRE regex code (0.8.0)Rich Felker-1168/+1037
the main practical results of this change are 1. the regex code is no longer subject to LGPL; it's now 2-clause BSD 2. most (all?) popular nonstandard regex extensions are supported I hesitate to call this a "sync" since both the old and new code are heavily modified. in one sense, the old code was "more severely" modified, in that it was actively hostile to non-strictly-conforming expressions. on the other hand, the new code has eliminated the useless translation of the entire regex string to wchar_t prior to compiling, and now only converts multibyte character literals as needed. in the future i may use this modified TRE as a basis for writing the long-planned new regex engine that will avoid multibyte-to-wide character conversion entirely by compiling multibyte bracket expressions specific to UTF-8.
2012-03-20nearbyint optimization (only clear inexact when necessary)nsz-19/+29
old code saved/restored the fenv (the new code is only as slow as that when inexact is not set before the call, but some other flag is set and the rounding is inexact, which is rare) before: bench_nearbyint_exact 5000000 N 261 ns/op bench_nearbyint_inexact_set 5000000 N 262 ns/op bench_nearbyint_inexact_unset 5000000 N 261 ns/op after: bench_nearbyint_exact 10000000 N 94.99 ns/op bench_nearbyint_inexact_set 25000000 N 65.81 ns/op bench_nearbyint_inexact_unset 10000000 N 94.97 ns/op
2012-03-20remove a fixme commentnsz-3/+2
2012-03-20clean up pow.c and powf.cnsz-57/+43
fix comments about special cases
2012-03-20clean up powl.cnsz-92/+47
fix special cases, use multiplication instead of scalbnl