Jakub Jelinek 63c99cd50b math: Fix up THREEp96 constant in expf128 [BZ #32411] ... As mentioned by the reporter in a pull request against gcc-mirror, the THREEp96 constant in e_expl.c is incorrect, it is actually 0x3.p+94f128 rather than 0x3.p+96f128. The algorithm uses that to compute the t2 integer (tval2), by whose delta it adjusts the x+xl pair and then in the result uses the precomputed exp value for that entry. Using 0x3.p+94f128 rather than 0x3.p+96f128 results in tval2 sometimes being one smaller, sometimes one larger than the desired value, thus can mean the x+xl pair after adjustment will be larger in absolute value than it should be. DesWursters created a test program for this https://github.com/DesWurstes/comparefloats and his results were total: 1135000000 not_equal: 4322 earlier_score: 674 later_score: 3648 I've modified this so with https://sourceware.org/bugzilla/show_bug.cgi?id=32411#c3 so that it actually tests pseudo-random _Float128 values with range (-16384.,16384) with strong bias on values larger than 0.0002 in absolute value (so that tval1/tval2 aren't zero most of the time) and that gave total: 10000000000 not_equal: 29861 earlier_score: 4606 later_score: 25255 So, in both cases, in most cases the change doesn't result in any differences, and in those rare cases where does, about 85% have smaller ulp than without the patch. Additionally I've tried https://sourceware.org/bugzilla/show_bug.cgi?id=32411#c4 and in 2 billion iterations it didn't find any case where x+xl after the adjustments without this change would be smaller in absolute value compared to x+xl after the adjustments with this change. Reviewed-by: Joseph Myers <josmyers@redhat.com>		2025-04-09 18:24:11 +02:00
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bits	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
Makeconfig	…
Makefile	stdio-common: Add scanf long double data for IEEE 754 binary128 format	2025-03-25 09:40:20 +00:00
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e_exp10l.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
e_expl.c	math: Fix up THREEp96 constant in expf128 [BZ #32411]	2025-04-09 18:24:11 +02:00
e_fmodl.c	…
e_gammal_r.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
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e_rem_pio2l.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
e_remainderl.c	sysdeps/ieee754: Fix remainder sign of zero for FE_DOWNWARD (BZ #32711)	2025-02-26 17:17:25 -03:00
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float128-abi.h	…
gamma_productl.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
ieee754.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
k_cosl.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
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lgamma_productl.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math-nan-payload-ldouble.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
math_ldbl.h	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
mpn2ldbl.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
printf_fphex.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
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s_erfcl.c	math: Split s_erfF in erff and erfc	2024-11-22 10:52:26 -03:00
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t_sincosl.c	Update copyright dates with scripts/update-copyrights	2025-01-01 11:22:09 -08:00
tst-scanf-format-ldouble-a.input	stdio-common: Reject real data w/o exponent digits in scanf [BZ #12701]	2025-03-28 12:35:53 +00:00
tst-scanf-format-ldouble-aa.input	stdio-common: Reject real data w/o exponent digits in scanf [BZ #12701]	2025-03-28 12:35:53 +00:00
tst-scanf-format-ldouble-e.input	stdio-common: Reject real data w/o exponent digits in scanf [BZ #12701]	2025-03-28 12:35:53 +00:00
tst-scanf-format-ldouble-ee.input	stdio-common: Reject real data w/o exponent digits in scanf [BZ #12701]	2025-03-28 12:35:53 +00:00
tst-scanf-format-ldouble-f.input	stdio-common: Add scanf long double data for IEEE 754 binary128 format	2025-03-25 09:40:20 +00:00
tst-scanf-format-ldouble-ff.input	stdio-common: Add scanf long double data for IEEE 754 binary128 format	2025-03-25 09:40:20 +00:00
tst-scanf-format-ldouble-g.input	stdio-common: Reject real data w/o exponent digits in scanf [BZ #12701]	2025-03-28 12:35:53 +00:00
tst-scanf-format-ldouble-gg.input	stdio-common: Reject real data w/o exponent digits in scanf [BZ #12701]	2025-03-28 12:35:53 +00:00
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