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glibc/sysdeps/ieee754/dbl-64
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Joseph Myers ce8fc784e6 Fix sign of remquo zero remainder in round-downward mode (bug 17987). 
Various remquo implementations produce a zero remainder with the wrong
sign (a zero remainder should always have the sign of the first
argument, as specified in IEEE 754) in round-downward mode, resulting
from the sign of 0 - 0.  This patch checks for zero results and fixes
their sign accordingly.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #17987]
	* sysdeps/ieee754/dbl-64/s_remquo.c (__remquo): Ensure sign of
	zero result does not depend on the sign resulting from
	subtraction.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_remquo.c (__remquo):
	Likewise.
	* sysdeps/ieee754/flt-32/s_remquof.c (__remquof): Likewise.
	* sysdeps/ieee754/ldbl-128/s_remquol.c (__remquol): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_remquol.c (__remquol): Likewise.
	* sysdeps/ieee754/ldbl-96/s_remquol.c (__remquol): Likewise.
	* math/libm-test.inc (remquo_test_data): Add more tests.
 		2015-02-17 00:41:50 +00:00
..
wordsize-64 Fix sign of remquo zero remainder in round-downward mode (bug 17987). 2015-02-17 00:41:50 +00:00
Makefile Compile e_sqrt.c with -ffp-contract=off. 2013-12-18 12:07:06 +00:00
MathLib.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
asincos.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
atnat.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
atnat2.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
branred.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
branred.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
dbl2mpn.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
dla.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
doasin.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
doasin.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
dosincos.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
dosincos.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_acos.c
…
e_acosh.c
…
e_asin.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_atan2.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_atanh.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_cosh.c Fix cosh spurious underflows from expm1 (bug 16354), inaccurate results near 0 (bug 17061). 2014-06-23 20:20:10 +00:00
e_exp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_exp2.c Fix exp2 spurious underflows (bug 16560). 2015-02-12 19:02:45 +00:00
e_exp10.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_fmod.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_gamma_r.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_hypot.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_ilogb.c
…
e_j0.c
…
e_j1.c Set errno for y1 overflow (bug 17050). 2014-06-23 20:17:13 +00:00
e_jn.c Fix yn overflow handling in non-default rounding modes (bug 16561, bug 16562). 2014-06-27 14:52:13 +00:00
e_lgamma_r.c
…
e_log.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_log2.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_log10.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_pow.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_rem_pio2.c
…
e_remainder.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_sinh.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_sqrt.c Fix libm fegetround namespace (bug 17748). 2015-01-02 20:44:42 +00:00
gamma_product.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
gamma_productf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
halfulp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
k_cos.c
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k_rem_pio2.c
…
k_sin.c
…
k_tan.c
…
mpa-arch.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpa.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpa.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpatan.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpatan.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpatan2.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpexp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mplog.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpn2dbl.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpsqrt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpsqrt.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mptan.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mydefs.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
powtwo.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
root.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_asinh.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_atan.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_cbrt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_ceil.c
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s_copysign.c
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s_cos.c
…
s_erf.c Fix erf underflow handling near 0 (bug 16516). 2014-05-14 12:34:03 +00:00
s_expm1.c
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s_fabs.c
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s_finite.c PowerPC: multiarch finite/finitef for PowerPC32 2013-12-06 05:47:03 -06:00
s_floor.c
…
s_fma.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fmaf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fpclassify.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_frexp.c
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s_isinf.c
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s_isinf_ns.c
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s_isnan.c
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s_issignaling.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_llrint.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_llround.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_log1p.c [BZ #16823] Fix log1pl returning wrong infinity sign 2014-04-29 15:43:36 +02:00
s_logb.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_lrint.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_lround.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_modf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_nearbyint.c
…
s_nexttoward.c
…
s_remquo.c Fix sign of remquo zero remainder in round-downward mode (bug 17987). 2015-02-17 00:41:50 +00:00
s_rint.c
…
s_round.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_scalbln.c [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
s_scalbn.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_signbit.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_sin.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_sincos.c Fix sincos errno setting (bug 15467). 2015-02-11 23:17:25 +00:00
s_tan.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_tanh.c
…
s_trunc.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
sincos32.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
sincos32.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
sincostab.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
slowexp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
slowpow.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
t_exp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
t_exp2.h
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uasncs.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
uatan.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
uexp.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
uexp.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
ulog.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
ulog.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
upow.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
upow.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
urem.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
uroot.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
usncs.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
utan.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
utan.tbl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
w_exp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
x2y2m1.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
x2y2m1f.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00