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f8ba1b5654
glibc/sysdeps/ieee754/ldbl-128ibm
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Joseph Myers f8ba1b5654 Fix log2 (1) in round-downward mode (bug 17042). 
As with other issues of this kind, bug 17042 is log2 (1) wrongly
returning -0 instead of +0 in round-downward mode because of
implementations effectively in terms of log1p (x - 1).  This patch
fixes the issue in the same way used for log and log10.

Tested x86_64 and x86 and ulps updated accordingly.  Also tested for
mips64 to confirm a fix was needed for ldbl-128 and to validate that
fix (also applied to ldbl-128ibm since that version of log2l is
essentially the same as the ldbl-128 one).

	[BZ #17042]
	* sysdeps/i386/fpu/e_log2.S (__ieee754_log2): Take absolete value
	when x - 1 is zero.
	* sysdeps/i386/fpu/e_log2f.S (__ieee754_log2f): Likewise.
	* sysdeps/i386/fpu/e_log2l.S (__ieee754_log2l): Likewise.
	* sysdeps/ieee754/ldbl-128/e_log2l.c (__ieee754_log2l): Return
	0.0L for an argument of 1.0L.
	* sysdeps/ieee754/ldbl-128ibm/e_log2l.c (__ieee754_log2l):
	Likewise.
	* sysdeps/x86_64/fpu/e_log2l.S (__ieee754_log2l): Take absolute
	value when x - 1 is zero.
	* math/libm-test.inc (log2_test): Use ALL_RM_TEST.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2014-06-10 12:07:15 +00:00
..
e_acoshl.c Fix ldbl-128ibm acoshl inaccuracy (bug 16384). 2014-01-02 16:33:06 +00:00
e_acosl.c Avoid ordered comparisons of NaNs in ldbl-128ibm acosl and asinl. 2013-10-10 19:11:30 +00:00
e_asinl.c Avoid ordered comparisons of NaNs in ldbl-128ibm acosl and asinl. 2013-10-10 19:11:30 +00:00
e_atan2l.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
e_atanhl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
e_coshl.c Fix ldbl-128ibm coshl spurious overflows (bug 16407). 2014-01-07 22:00:04 +00:00
e_exp10l.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_expl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_fmodl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_gammal_r.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_hypotl.c PowerPC floating point little-endian [4 of 15] 2013-10-04 10:32:48 +09:30
e_ilogbl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
e_j0l.c 2006-01-27 Dwayne Grant McConnell <decimal@us.ibm.com> 2006-01-28 00:15:15 +00:00
e_j1l.c 2006-01-27 Dwayne Grant McConnell <decimal@us.ibm.com> 2006-01-28 00:15:15 +00:00
e_jnl.c Fix Bessel function error handling (bug 6807, bug 15901). 2013-12-04 14:39:37 +00:00
e_lgammal_r.c 2006-01-27 Dwayne Grant McConnell <decimal@us.ibm.com> 2006-01-28 00:15:15 +00:00
e_log2l.c Fix log2 (1) in round-downward mode (bug 17042). 2014-06-10 12:07:15 +00:00
e_log10l.c Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
e_logl.c Fix ldbl-128ibm logl inaccuracy (bug 16386). 2014-01-02 16:35:46 +00:00
e_powl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
e_rem_pio2l.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_remainderl.c PowerPC floating point little-endian [4 of 15] 2013-10-04 10:32:48 +09:30
e_sinhl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
e_sqrtl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
gamma_productl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ieee754.h Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_cosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_sincosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_sinl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_tanl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
ldbl2mpn.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Makefile 2006-01-27 Dwayne Grant McConnell <decimal@us.ibm.com> 2006-01-28 00:15:15 +00:00
math_ldbl.h Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
mpn2ldbl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
printf_fphex.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_asinhl.c Fix ldbl-128ibm asinhl inaccuracy (bug 16385). 2014-01-02 16:34:24 +00:00
s_atanl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_cbrtl.c 2006-01-27 Dwayne Grant McConnell <decimal@us.ibm.com> 2006-01-28 00:15:15 +00:00
s_ceill.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_copysignl.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_cosl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_cprojl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_ctanhl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_ctanl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_erfl.c Fix erf underflow handling near 0 (bug 16516). 2014-05-14 12:34:03 +00:00
s_expm1l.c Fix ldbl-128ibm expm1l on large arguments (bug 16408). 2014-01-08 13:32:39 +00:00
s_fabsl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_finitel.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_floorl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmal.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fpclassifyl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_frexpl.c Correct IBM long double frexpl. 2014-04-16 19:33:32 +09:30
s_isinf_nsl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_isinfl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_isnanl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_issignalingl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_llrintl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_llroundl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_log1pl.c Fix log1pl (LDBL_MAX) in FE_UPWARD mode (bug 16564). 2014-05-14 12:38:56 +00:00
s_logbl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_lrintl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_lroundl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_modfl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_nearbyintl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_nextafterl.c Correct IBM long double nextafterl. 2014-04-02 13:46:19 +10:30
s_nexttoward.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_nexttowardf.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_remquol.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_rintl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_roundl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_scalblnl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_scalbnl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_signbitl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_sincosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_sinl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_tanhl.c PowerPC floating point little-endian [3 of 15] 2013-10-04 10:32:36 +09:30
s_tanl.c PowerPC floating point little-endian [2 of 15] 2013-10-04 10:32:19 +09:30
s_truncl.c PowerPC: remove wrong truncl implementation for PowerPC64 2014-01-08 08:14:48 -06:00
strtold_l.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
t_sincosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_expl.c BZ#13889: expl (709.75) wrongly overflows for ldbl-128ibm 2013-03-22 12:39:10 -03:00
x2y2m1l.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00