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f8ba1b5654
glibc/sysdeps/x86_64/fpu
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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
..
multiarch Fix implicit __isinf declarations in exp. 2014-03-24 22:00:32 +00:00
dla.h Better DLA_FMS 2011-10-24 22:11:21 -04:00
e_acosl.c Update. 2001-09-19 10:37:31 +00:00
e_atan2l.c Update. 2001-09-19 10:37:31 +00:00
e_exp2l.S Optimize libm 2011-10-12 11:27:51 -04:00
e_exp10l.S Fix exp10 inaccuracy and exceptions (bugs 13884, 13914). 2012-05-06 18:23:44 +00:00
e_expf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_expl.S Fix x86/x86_64 expl/exp10l spurious underflows (bug 16348). 2014-03-27 18:41:14 +00:00
e_fmodl.S Optimize libm 2011-10-12 11:27:51 -04:00
e_ilogbl.S Remove useless __ilogb*_finite aliases 2012-04-18 00:40:13 +02:00
e_log2l.S Fix log2 (1) in round-downward mode (bug 17042). 2014-06-10 12:07:15 +00:00
e_log10l.S Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
e_logl.S Fix log (1) in round-downward mode (bug 16731). 2014-03-21 18:13:58 +00:00
e_powl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_remainderl.S Optimize libm 2011-10-12 11:27:51 -04:00
e_scalbl.S Get rid of ASM_TYPE_DIRECTIVE{,_PREFIX}. 2012-08-02 21:04:29 +02:00
e_sqrt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_sqrtf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_sqrtl.c Update. 2001-09-19 10:37:31 +00:00
fclrexcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fedisblxcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feenablxcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fegetenv.c Make x86_64 fegetenv preserve exception mask (bug 16198). 2014-03-26 18:59:08 +00:00
fegetexcept.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fegetround.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feholdexcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fesetenv.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fesetround.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feupdateenv.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fgetexcptflg.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fraiseexcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fsetexcptflg.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ftestexcept.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Implies Use x86_64 fpu/bits/fenv.h for i386 and x86_64 2012-06-06 10:13:19 -07:00
k_rem_pio2l.c Dummy files to prevent stub versions from being used. 2007-05-17 18:39:55 +00:00
libm-test-ulps Fix log2 (1) in round-downward mode (bug 17042). 2014-06-10 12:07:15 +00:00
math_ldbl.h Update. 2001-09-19 10:37:31 +00:00
math_private.h Use movq for 64-bit operations 2013-05-15 20:33:45 +02:00
printf_fphex.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_atanl.c Update. 2001-09-19 10:37:31 +00:00
s_ceill.S Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
s_copysign.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_copysignf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_copysignl.S Update. 2002-07-06 15:07:30 +00:00
s_cosf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_expm1l.S Fix x86/x86_64 expm1l inaccuracy and exceptions (bugs 13885, 13923). 2012-05-07 19:13:08 +00:00
s_fabs.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fabsf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fabsl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fdiml.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_finitel.S Update. 2002-09-10 01:40:26 +00:00
s_floorl.S Update. 2003-11-18 07:25:02 +00:00
s_fmax.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaxf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaxl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmin.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fminf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fminl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fpclassifyl.c Update. 2001-09-19 10:37:31 +00:00
s_isinfl.c Update. 2001-09-19 10:37:31 +00:00
s_isnanl.c Update. 2001-09-19 10:37:31 +00:00
s_llrint.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_llrintf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_llrintl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_log1pl.S Fix log1pl (LDBL_MAX) in FE_UPWARD mode (bug 16564). 2014-05-14 12:38:56 +00:00
s_logbl.c Update. 2001-09-19 10:37:31 +00:00
s_lrint.S lrint and llrint implementation for x86-64. 2002-04-08 08:14:22 +00:00
s_lrintf.S lrint and llrint implementation for x86-64. 2002-04-08 08:14:22 +00:00
s_lrintl.S lrint and llrint implementation for x86-64. 2002-04-08 08:14:22 +00:00
s_nearbyintl.S Update. 2003-11-18 07:25:02 +00:00
s_nextafterl.c Update. 2001-09-19 10:37:31 +00:00
s_nexttoward.c Update. 2001-09-19 10:37:31 +00:00
s_nexttowardf.c Update. 2001-09-19 10:37:31 +00:00
s_rintl.c Update. 2001-09-19 10:37:31 +00:00
s_scalbnl.S Update. 2003-11-18 07:25:02 +00:00
s_signbit.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_signbitf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_significandl.c Update. 2001-09-19 10:37:31 +00:00
s_sincosf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_sinf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_truncl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00