- 12 12月, 2012 6 次提交
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由 Szabolcs Nagy 提交于
uses the lanczos approximation method with the usual tweaks. same parameters were selected as in boost and python. (avoides some extra work and special casing found in boost so the precision is not that good: measured error is <5ulp for positive x and <10ulp for negative) an alternative lgamma_r implementation is also given in the same file which is simpler and smaller than the current one, but less precise so it's ifdefed out for now.
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由 Szabolcs Nagy 提交于
do fabs by hand, don't check for nan and inf separately
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
__invtrigl is not needed when acosl, asinl, atanl have asm implementations
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由 Szabolcs Nagy 提交于
modifications: * avoid unsigned->signed conversions * removed various volatile hacks * use FORCE_EVAL when evaluating only for side-effects * factor out R() rational approximation instead of manual inline * __invtrigl.h now only provides __invtrigl_R, __pio2_hi and __pio2_lo * use 2*pio2_hi, 2*pio2_lo instead of pi_hi, pi_lo otherwise the logic is not changed, long double versions will need a revisit when a genaral long double cleanup happens
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由 Szabolcs Nagy 提交于
modifications: * avoid unsigned->signed integer conversion * do not handle special cases when they work correctly anyway * more strict threshold values (0x1p26 instead of 0x1p28 etc) * smaller code, cleaner branching logic * same precision as the old code: acosh(x) has up to 2ulp error in [1,1.125] asinh(x) has up to 1.6ulp error in [0.125,0.5], [-0.5,-0.125] atanh(x) has up to 1.7ulp error in [0.125,0.5], [-0.5,-0.125]
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- 08 12月, 2012 1 次提交
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由 Rich Felker 提交于
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- 18 11月, 2012 5 次提交
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由 Szabolcs Nagy 提交于
use the 'f' suffix when a float constant is not representable
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由 Szabolcs Nagy 提交于
raise overflow and underflow when necessary, fix various comments.
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由 Szabolcs Nagy 提交于
similar to exp.c cleanup: use scalbnf, don't return excess precision, drop some optimizatoins. exp.c was changed to be more consistent with expf.c code.
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由 Szabolcs Nagy 提交于
* old code relied on sign extension on right shift * exp2l ld64 wrapper was wrong * use scalbn instead of bithacks
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由 Szabolcs Nagy 提交于
overflow and underflow was incorrect when the result was not stored. an optimization for the 0.5*ln2 < |x| < 1.5*ln2 domain was removed. did various cleanups around static constants and made the comments consistent with the code.
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- 14 11月, 2012 2 次提交
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由 Szabolcs Nagy 提交于
keeping only commonly used data in invtrigl
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由 Szabolcs Nagy 提交于
this also fixes overflow/underflow raising and excess precision issues (as those are handled well in scalbn)
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- 13 11月, 2012 11 次提交
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
old code was correct only if the result was stored (without the excess precision) or musl was compiled with -ffloat-store. now we use STRICT_ASSIGN to work around the issue. (see note 160 in c11 section 6.8.6.4)
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由 Szabolcs Nagy 提交于
old code was correct only if the result was stored (without the excess precision) or musl was compiled with -ffloat-store. (see note 160 in n1570.pdf section 6.8.6.4)
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由 Szabolcs Nagy 提交于
old code (return x+x;) returns correct value and raises correct flags only if the result is stored as double (or float)
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
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由 Szabolcs Nagy 提交于
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- 14 8月, 2012 2 次提交
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由 Rich Felker 提交于
this function never existed historically; since the float/double functions it's based on are nonstandard and deprecated, there's really no justification for its existence except that glibc has it. it can be added back if there's ever really a need...
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由 Rich Felker 提交于
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- 09 8月, 2012 1 次提交
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由 nsz 提交于
exp(inf), exp(-inf), exp(nan) used to raise wrong flags
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- 03 7月, 2012 2 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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- 21 6月, 2012 2 次提交
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由 nsz 提交于
The long double adjustment was wrong: The usual check is mant_bits & 0x7ff == 0x400 before doing a mant_bits++ or mant_bits-- adjustment since this is the only case when rounding an inexact ld80 into double can go wrong. (only in nearest rounding mode) After such a check the ++ and -- is ok (the mantissa will end in 0x401 or 0x3ff). fma is a bit different (we need to add 3 numbers with correct rounding: hi_xy + lo_xy + z so we should survive two roundings at different places without precision loss) The adjustment in fma only checks for zero low bits mant_bits & 0x3ff == 0 this way the adjusted value is correct when rounded to double or *less* precision. (this is an important piece in the fma puzzle) Unfortunately in this case the -- is not a correct adjustment because mant_bits might underflow so further checks are needed and this was the source of the bug.
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由 Rich Felker 提交于
this is silly, but it makes apps that read binary junk and interpret it as ld80 "safer", and it gets gnulib to stop replacing printf...
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- 03 6月, 2012 1 次提交
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由 Rich Felker 提交于
this was fixed previously on i386 but the corresponding code on x86_64 was missed.
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- 08 5月, 2012 2 次提交
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由 nsz 提交于
backported fix from freebsd: http://svnweb.FreeBSD.org/base?view=revision&revision=233973
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由 Rich Felker 提交于
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- 07 5月, 2012 2 次提交
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由 nsz 提交于
updated nextafter* to use FORCE_EVAL, it can be used in many other places in the math code to improve readability.
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由 Rich Felker 提交于
apparently initializing a variable is not "using" it but assigning to it is "using" it. i don't really like this fix, but it's better than trying to make a bigger cleanup just before a release, and it should work fine (tested against nsz's math tests).
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- 06 5月, 2012 1 次提交
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由 nsz 提交于
make nexttoward, nexttowardf independent of long double representation. fix nextafterl: it did not raise underflow flag when the result was 0.
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- 05 5月, 2012 1 次提交
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由 nsz 提交于
old: 2*atan2(sqrt(1-x),sqrt(1+x)) new: atan2(fabs(sqrt((1-x)*(1+x))),x) improvements: * all edge cases are fixed (sign of zero in downward rounding) * a bit faster (here a single call is about 131ns vs 162ns) * a bit more precise (at most 1ulp error on 1M uniform random samples in [0,1), the old formula gave some 2ulp errors as well)
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- 01 5月, 2012 1 次提交
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由 Rich Felker 提交于
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