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2013-09-05math: fix expm1l on x86_64 (avoid underflow for large negative x)Szabolcs Nagy-3/+13
copy the fix from i386: return -1 instead of exp2l(x)-1 when x <= -65
2013-09-05math: fix lrintl.s on x86_64 (use movslq to signextend the result)Szabolcs Nagy-1/+1
2013-09-05math: fix exp2l asm on x86 (raise underflow correctly)Szabolcs Nagy-67/+78
there were two problems: * omitted underflow on subnormal results: exp2l(-16383.5) was calculated as sqrt(2)*2^-16384, the last bits of sqrt(2) are zero so the down scaling does not underflow eventhough the result is in subnormal range * spurious underflow for subnormal inputs: exp2l(0x1p-16400) was evaluated as f2xm1(x)+1 and f2xm1 raised underflow (because inexact subnormal result) the first issue is fixed by raising underflow manually if x is in (-32768,-16382] and not integer (x-0x1p63+0x1p63 != x) the second issue is fixed by treating x in (-0x1p64,0x1p64) specially for these fixes the special case handling was completely rewritten
2013-09-05math: cosmetic cleanup (use explicit union instead of fshape and dshape)Szabolcs Nagy-166/+140
2013-09-05math: remove *_WORD64 macros from libm.hSzabolcs Nagy-29/+13
only fma used these macros and the explicit union is clearer
2013-09-05math: remove old longdbl.hSzabolcs Nagy-113/+0
2013-09-05math: long double fix (use ldshape union)Szabolcs Nagy-51/+24
* use new ldshape union consistently * add ld128 support to frexpl * simplify sqrtl comment (ld64 is not just arm)
2013-09-05math: use float_t and double_t in scalbnf and scalbnSzabolcs Nagy-16/+20
remove STRICT_ASSIGN (c99 semantics is assumed) and use the conventional union to prepare the scaling factor (so libm.h is no longer needed)
2013-09-05math: fix remaining old long double code (erfl, fmal, lgammal, scalbnl)Szabolcs Nagy-93/+65
in lgammal don't handle 1 and 2 specially, in fma use the new ldshape union instead of ld80 one.
2013-09-05math: cbrt cleanup and long double fixSzabolcs Nagy-72/+59
* use float_t and double_t * cleanup subnormal handling * bithacks according to the new convention (ldshape for long double and explicit unions for float and double)
2013-09-05math: fix underflow in exp*.c and long double handling in exp2lSzabolcs Nagy-182/+139
* don't care about inexact flag * use double_t and float_t (faster, smaller, more precise on x86) * exp: underflow when result is zero or subnormal and not -inf * exp2: underflow when result is zero or subnormal and not exact * expm1: underflow when result is zero or subnormal * expl: don't underflow on -inf * exp2: fix incorrect comment * expm1: simplify special case handling and overflow properly * expm1: cleanup final scaling and fix negative left shift ub (twopk)
2013-09-05math: long double trigonometric cleanup (cosl, sinl, sincosl, tanl)Szabolcs Nagy-236/+228
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.
2013-09-05math: long double inverse trigonometric cleanup (acosl, asinl, atanl, atan2l)Szabolcs Nagy-103/+180
* added ld128 support from freebsd fdlibm (untested) * using new ldshape union instead of IEEEl2bits * inexact status flag is not supported
2013-09-05math: rewrite hypotSzabolcs Nagy-324/+135
method: if there is a large difference between the scale of x and y then the larger magnitude dominates, otherwise reduce x,y so the argument of sqrt (x*x+y*y) does not overflow or underflow and calculate the argument precisely using exact multiplication. If the argument has less error than 1/sqrt(2) ~ 0.7 ulp, then the result has less error than 1 ulp in nearest rounding mode. the original fdlibm method was the same, except it used bit hacks instead of dekker-veltkamp algorithm, which is problematic for long double where different representations are supported. (the new hypot and hypotl code should be smaller and faster on 32bit cpu archs with fast fpu), the new code behaves differently in non-nearest rounding, but the error should be still less than 2ulps. ld80 and ld128 are supported
2013-09-05math: rewrite remainder functions (remainder, remquo, fmod, modf)Szabolcs Nagy-1010/+472
* results are exact * modfl follows truncl (raises inexact flag spuriously now) * modf and modff only had cosmetic cleanup * remainder is just a wrapper around remquo now * using iterative shift+subtract for remquo and fmod * ld80 and ld128 are supported as well
2013-09-05math: rewrite rounding functions (ceil, floor, trunc, round, rint)Szabolcs Nagy-905/+274
* faster, smaller, cleaner implementation than the bit hacks of fdlibm * use arithmetics like y=(double)(x+0x1p52)-0x1p52, which is an integer neighbor of x in all rounding modes (0<=x<0x1p52) and only use bithacks when that's faster and smaller (for float it usually is) * the code assumes standard excess precision handling for casts * long double code supports both ld80 and ld128 * nearbyint is not changed (it is a wrapper around rint)
2013-09-05math: fix logb(-0.0) in downward rounding modeSzabolcs Nagy-6/+6
use -1/(x*x) instead of -1/(x+0) to return -inf, -0+0 is -0 in downward rounding mode
2013-09-05math: ilogb cleanupSzabolcs Nagy-16/+43
* consistent code style * explicit union instead of typedef for double and float bit access * turn FENV_ACCESS ON to make 0/0.0f raise invalid flag * (untested) ld128 version of ilogbl (used by logbl which has ld128 support)
2013-09-05long double cleanup, initial commitSzabolcs Nagy-96/+89
new ldshape union, ld128 support is kept, code that used the old ldshape union was rewritten (IEEEl2bits union of freebsd libm is not touched yet) ld80 __fpclassifyl no longer tries to handle invalid representation
2013-09-04fix typo in comment in __randnameRich Felker-1/+1
2013-09-02fix mips-specific bug in synccall (too little space for signal mask)Rich Felker-5/+3
switch to the new __block_all_sigs/__restore_sigs internal API to clean up the code too.
2013-09-02in synccall, ignore the signal before any threads' signal handlers returnRich Felker-4/+4
this protects against deadlock from spurious signals (e.g. sent by another process) arriving after the controlling thread releases the other threads from the sync operation.
2013-09-02fix invalid pointer in synccall (multithread setuid, etc.)Rich Felker-0/+1
the head pointer was not being reset between calls to synccall, so any use of this interface more than once would build the linked list incorrectly, keeping the (now invalid) list nodes from the previous call.
2013-09-01fix special-case breakage in popen due to reversed argument orderRich Felker-1/+1
2013-09-01add workaround header for wait.h remapping to sys/wait.hRich Felker-0/+2
2013-08-31fix missing return value warning in faccessat, minor cleanupRich Felker-1/+1
clone will pass the return value of the start function to SYS_exit anyway; there's no need to call the syscall directly.
2013-08-31fix invalid %m format crash in wide scanf variantsRich Felker-0/+2
the wide variant was missed in the previous commit.
2013-08-31avoid crash in scanf when invalid %m format is encounteredRich Felker-0/+2
invalid format strings invoke undefined behavior, so this is not a conformance issue, but it's nicer for scanf to report the error safely instead of calling free on a potentially-uninitialized pointer or a pointer to memory belonging to the caller.
2013-08-31remove incorrect cancellation points from realpathRich Felker-4/+4
2013-08-31debloat realpath's allocation strategyRich Felker-12/+6
rather than allocating a PATH_MAX-sized buffer when the caller does not provide an output buffer, work first with a PATH_MAX-sized temp buffer with automatic storage, and either copy it to the caller's buffer or strdup it on success. this not only avoids massive memory waste, but also avoids pulling in free (and thus the full malloc implementation) unnecessarily in static programs.
2013-08-31make realpath use O_PATH when opening the fileRich Felker-1/+1
this avoids failure if the file is not readable and avoids odd behavior for device nodes, etc. on old kernels that lack O_PATH, the old behavior (O_RDONLY) will naturally happen as the fallback.
2013-08-31fix regression in creation of ldso symlinkRich Felker-1/+1
DESTDIR was wrongly included in the symlink contents.
2013-08-31fix breakage in synccall due to incorrect signal restoration in sigqueueRich Felker-2/+3
commit 07827d1a82fb33262f686eda959857f0d28cd8fa seems to have introduced this issue. sigqueue is called from the synccall core, at which time, even implementation-internal signals are blocked. however, pthread_sigmask removes the implementation-internal signals from the old mask before returning, so that a process which began life with them blocked will not be able to save a signal mask that has them blocked, possibly causing them to become re-blocked later. however, this was causing sigqueue to unblock the implementation-internal signals during synccall, leading to deadlock.
2013-08-30fix typo in release notesv0.9.13Rich Felker-1/+1
2013-08-30release notes for 0.9.13Rich Felker-0/+55
2013-08-30only expose struct tcphdr under _GNU_SOURCERich Felker-1/+3
the BSD and GNU versions of this structure differ, so exposing it in the default _BSD_SOURCE profile is possibly problematic. both versions could be simultaneously supported with anonymous unions if needed in the future, but for now, just omitting it except under _GNU_SOURCE should be safe.
2013-08-30add struct tcphdr in netinet/tcp.hRich Felker-0/+33
2013-08-28remove -Wcast-align from --enable-warningsRich Felker-1/+0
I originally added this warning option based on a misunderstanding of how it works. it does not warn whenever the destination of the cast has stricter alignment; it only warns in cases where misaligned dereference could lead to a fault. thus, it's essentially a no-op for i386, which had me wrongly believing the code was clean for this warning level. on other archs, numerous diagnostic messages are produced, and all of them are false-positives, so it's better just not to use it.
2013-08-28optimized C memcpyRich Felker-16/+111
unlike the old C memcpy, this version handles word-at-a-time reads and writes even for misaligned copies. it does not require that the cpu support misaligned accesses; instead, it performs bit shifts to realign the bytes for the destination. essentially, this is the C version of the ARM assembly language memcpy. the ideas are all the same, and it should perform well on any arch with a decent number of general-purpose registers that has a barrel shift operation. since the barrel shifter is an optional cpu feature on microblaze, it may be desirable to provide an alternate asm implementation on microblaze, but otherwise the C code provides a competitive implementation for "generic risc-y" cpu archs that should alleviate the urgent need for arch-specific memcpy asm.
2013-08-28stdbool.h should define __bool_true_false_are_defined even for C++Rich Felker-2/+2
while the incorporation of this requirement from C99 into C++11 was likely an accident, some software expects it to be defined, and it doesn't hurt. if the requirement is removed, then presumably __bool_true_false_are_defined would just be in the implementation namespace and thus defining it would still be legal.
2013-08-27fix invalid instruction mnemonics in powerpc fenv asmRich Felker-3/+3
there is no non-dot version of the andis instruction, but there's no harm in updating the flags anyway, so just use the dot version.
2013-08-27optimized C memsetRich Felker-12/+77
this version of memset is optimized both for small and large values of n, and makes no misaligned writes, so it is usable (and near-optimal) on all archs. it is capable of filling up to 52 or 56 bytes without entering a loop and with at most 7 branches, all of which can be fully predicted if memset is called multiple times with the same size. it also uses the attribute extension to inform the compiler that it is violating the aliasing rules, unlike the previous code which simply assumed it was safe to violate the aliasing rules since translation unit boundaries hide the violations from the compiler. for non-GNUC compilers, 100% portable fallback code in the form of a naive loop is provided. I intend to eventually apply this approach to all of the string/memory functions which are doing word-at-a-time accesses.
2013-08-27add attribute((may_alias)) checking in configureRich Felker-0/+21
this will be needed for upcoming commits to the string/mem functions to correct their unannounced use of aliasing violations for word-at-a-time search, fill, and copy operations.
2013-08-25add the %s (seconds since the epoch) format to strftimeRich Felker-0/+4
this is a nonstandard extension but will be required in the next version of POSIX, and it's widely used/useful in shell scripts utilizing the date utility.
2013-08-24fix strftime regression in %e formatRich Felker-2/+2
%e pads with spaces instead of zeros.
2013-08-24properly fill in tzname[] for old (pre-64-bit-format) zoneinfo filesRich Felker-1/+22
in this case, the first standard-time and first daylight-time rules should be taken as the "default" ones to expose.
2013-08-24minor fix to tz name checkingRich Felker-2/+2
if a zoneinfo file is not (or is no longer) in use, don't check the abbrevs pointers, which may be invalid.
2013-08-24fix strftime handling of time zone dataRich Felker-8/+36
this may need further revision in the future, since POSIX is rather unclear on the requirements, and is designed around the assumption of POSIX TZ specifiers which are not sufficiently powerful to represent real-world timezones (this is why zoneinfo support was added). the basic issue is that strftime gets the string and numeric offset for the timezone from the extra fields in struct tm, which are initialized when calling localtime/gmtime/etc. however, a conforming application might have created its own struct tm without initializing these fields, in which case using __tm_zone (a pointer) could crash. other zoneinfo-based implementations simply check for a null pointer, but otherwise can still crash of the field contains junk. simply ignoring __tm_zone and using tzname[] would "work" but would give incorrect results in time zones with more complex rules. I feel like this would lower the quality of implementation. instead, simply validate __tm_zone: unless it points to one of the zone name strings managed by the timezone system, assume it's invalid. this commit also fixes several other minor bugs with formatting: tm_isdst being negative is required to suppress printing of the zone formats, and %z was using the wrong format specifiers since the type of val was changed, resulting in bogus output.
2013-08-23make dlopen honor the rpath of the main programRich Felker-1/+1
this seems to match what other systems do, and seems useful for programs that have their libraries and plugins stored relative to the executable.
2013-08-23fix mishandling of empty or blank TZ environment variableRich Felker-1/+1
the empty TZ string was matching equal to the initial value of the cached TZ name, thus causing do_tzset never to run and never to initialize the time zone data.