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* asm for hypot and hypotfRich Felker2012-03-232-0/+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.
* make dlerror conform to posixRich Felker2012-03-231-6/+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.
* simplify creal and cimag macrosRich Felker2012-03-221-8/+8
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* add creal/cimag macros in complex.h (and use them in the functions defs)Rich Felker2012-03-228-20/+20
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* tgmath.h: suppress any existing macro definitions before defining macrosRich Felker2012-03-221-0/+63
| | | | | this is necessary so that we can freely add macro versions of some of the math/complex functions without worrying about breaking tgmath.
* acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))nsz2012-03-222-6/+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.
* sysconf support for dynamic limits (open files and processes)Rich Felker2012-03-221-2/+9
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* fix DECIMAL_DIG definitionsRich Felker2012-03-214-2/+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.
* initial, very primitive strfmonRich Felker2012-03-212-0/+98
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* x86_64 math asm, long double functions onlyRich Felker2012-03-2017-0/+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.
* limits.h: support gcc's -funsigned-charRich Felker2012-03-201-2/+10
| | | | | some software apparently uses this and breaks with musl due to mismatching definitions...
* Merge remote branch 'nsz/master'Rich Felker2012-03-2010-198/+127
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| * nearbyint optimization (only clear inexact when necessary)nsz2012-03-203-19/+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
| * remove a fixme commentnsz2012-03-203-3/+2
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| * clean up pow.c and powf.cnsz2012-03-202-57/+43
| | | | | | | | fix comments about special cases
| * clean up powl.cnsz2012-03-201-92/+47
| | | | | | | | fix special cases, use multiplication instead of scalbnl
| * fix a cbrtl.c regression and remove x87 precision settingnsz2012-03-201-27/+6
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| * Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-204-24/+72
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| * \ Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-201-3/+11
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| * \ \ Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-201-23/+22
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| * \ \ \ Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-192-2/+2
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* | | | | | upgrade to latest upstream TRE regex code (0.8.0)Rich Felker2012-03-205-1168/+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.
* | | | | optimize scalbn familyRich Felker2012-03-203-7/+46
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | the fscale instruction is slow everywhere, probably because it involves a costly and unnecessary integer truncation operation that ends up being a no-op in common usages. instead, construct a floating point scale value with integer arithmetic and simply multiply by it, when possible. for float and double, this is always possible by going to the next-larger type. we use some cheap but effective saturating arithmetic tricks to make sure even very large-magnitude exponents fit. for long double, if the scaling exponent is too large to fit in the exponent of a long double value, we simply fallback to the expensive fscale method. on atom cpu, these changes speed up scalbn by over 30%. (min rdtsc timing dropped from 110 cycles to 70 cycles.)
* | | | | remquo asm: return quotient mod 8, as intended by the specRich Felker2012-03-191-17/+26
| |_|_|/ |/| | | | | | | | | | | | | | | this is a lot more efficient and also what is generally wanted. perhaps the bit shuffling could be more efficient...
* | | | use alternate formula for acos asm to avoid loss of precisionRich Felker2012-03-191-3/+11
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* | | Merge remote branch 'nsz/master'Rich Felker2012-03-1995-806/+655
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| * | code cleanup of named constantsnsz2012-03-1973-623/+513
| | | | | | | | | | | | | | | | | | | | | zero, one, two, half are replaced by const literals The policy was to use the f suffix for float consts (1.0f), but don't use suffix for long double consts (these consts can be exactly represented as double).
| * | fix remainder*.c: remove useless long double castnsz2012-03-192-15/+6
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| * | don't try to create non-standard denormalization signalnsz2012-03-193-7/+4
| | | | | | | | | | | | | | | | | | | | | | | | Underflow exception is only raised when the result is invalid, but fmod is always exact. x87 has a denormalization exception, but that's nonstandard. And the superflous *1.0 will be optimized away by any compiler that does not honor signaling nans.
| * | new modff.c code, fix nan handling in modflnsz2012-03-192-44/+26
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| * | use scalbn or *2.0 instead of ldexp, fix fmalnsz2012-03-198-101/+102
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some code assumed ldexp(x, 1) is faster than 2.0*x, but ldexp is a wrapper around scalbn which uses multiplications inside, so this optimization is wrong. This commit also fixes fmal which accidentally used ldexp instead of ldexpl loosing precision. There are various additional changes from the work-in-progress const cleanups.
| * | fix long double const workaround in cbrtlnsz2012-03-191-5/+1
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| * | don't inline __rem_pio2l so the code size is smallernsz2012-03-196-9/+2
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| * | minor fix in __tanl (get sign properly)nsz2012-03-191-2/+1
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* | | fix exp asmRich Felker2012-03-191-23/+22
| |/ |/| | | | | | | | | | | | | | | | | | | | | exponents (base 2) near 16383 were broken due to (1) wrong cutoff, and (2) inability to fit the necessary range of scalings into a long double value. as a solution, we fall back to using frndint/fscale for insanely large exponents, and also have to special-case infinities here to avoid inf-inf generating nan. thankfully the costly code never runs in normal usage cases.
* | Merge remote branch 'nsz/master'Rich Felker2012-03-197-80/+3
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| * remove long double const workaroundsnsz2012-03-196-79/+2
| | | | | | | | | | | | | | | | Some long double consts were stored in two doubles as a workaround for x86_64 and i386 with the following comment: /* Long double constants are slow on these arches, and broken on i386. */ This is most likely old gcc bug related to the default x87 fpu precision setting (it's double instead of double extended on BSD).
| * fix erfl wrapper for long double==double casensz2012-03-191-1/+1
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* | bug fix: wrong opcode for writing long longRich Felker2012-03-192-2/+2
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* asm for log1pRich Felker2012-03-193-0/+45
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* asm for log2Rich Felker2012-03-193-0/+21
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* asm for remquoRich Felker2012-03-193-0/+43
| | | | | this could perhaps use some additional testing for corner cases, but it seems to be correct.
* optimize exponential asm for i386Rich Felker2012-03-192-58/+77
| | | | | | up to 30% faster exp2 by avoiding slow frndint and fscale functions. expm1 also takes a much more direct path for small arguments (the expected usage case).
* Merge remote branch 'nsz/master'Rich Felker2012-03-195-163/+208
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| * simplify scalbn*.c implementationsnsz2012-03-193-152/+65
| | | | | | | | | | The old scalbn.c was wrong and slow, the new one is just slow. (scalbn(0x1p+1023,-2097) should give 0x1p-1074, but the old code gave 0)
| * Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-199-0/+75
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| * \ Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-1921-0/+157
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| * \ \ Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-1914-1/+109
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| * \ \ \ Merge branch 'master' of git://git.etalabs.net/muslnsz2012-03-199-0/+89
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| * | | | | remove unnecessary TODO comments from fma.cnsz2012-03-191-5/+1
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