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edbbdb1855
glibc/sysdeps/ieee754/flt-32
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Joseph Myers edbbdb1855 Fix powf inaccuracy (bug 21112). 
Bug 21112 reports a case where powf is substantially inaccurate.  This
results from a multiplication where cp_h*p_h is required to be exact,
and p_h is masked to have only 12 leading nonzero bits in its
mantissa, but the value of cp_h has the 13th bit nonzero, leading to
inexact multiplication results in some cases that can result in large
errors in the final result of powf.  This patch fixes this by using a
value of cp_h correctly rounded to nearest to 12 bits, with a
corresponding updated value of cp_l.

Tested for x86_64 and x86.

	[BZ #21112]
	* sysdeps/ieee754/flt-32/e_powf.c (cp_h): Use value with trailing
	12 bits zero.
	(cp_l): Update for new value of cp_h.
	* math/auto-libm-test-in: Add another test of pow.
	* math/auto-libm-test-out-pow: Regenerated.
2017-02-07 17:15:47 +00:00
..
e_acosf.c Fix acosf underflow (bug 14153). 2012-05-25 11:07:07 +00:00
e_acoshf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
e_asinf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_atan2f.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
e_atanhf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
e_coshf.c Avoid excess range overflowing results from cosh, sinh, lgamma (bug 18980). 2015-09-18 20:00:48 +00:00
e_exp2f.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
e_expf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
e_fmodf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
e_gammaf_r.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
e_hypotf.c Fix hypot sNaN handling (bug 20940). 2016-12-07 01:16:36 +00:00
e_ilogbf.c Remove useless __ilogb*_finite aliases 2012-04-18 00:40:13 +02:00
e_j0f.c Avoid uninitialized warnings in Bessel functions. 2015-02-26 21:49:19 +00:00
e_j1f.c Fix j1, jn missing errno setting on underflow (bug 18611). 2015-10-23 21:37:33 +00:00
e_jnf.c Fix j1, jn missing errno setting on underflow (bug 18611). 2015-10-23 21:37:33 +00:00
e_lgammaf_r.c Remove GCC version conditionals on -Wmaybe-uninitialized pragmas. 2015-10-27 23:42:20 +00:00
e_log2f.c Work around powerpc32 integer 0 converting to -0 (bug 887, bug 19049, bug 19050). 2015-10-05 17:46:50 +00:00
e_log10f.c Work around powerpc32 integer 0 converting to -0 (bug 887, bug 19049, bug 19050). 2015-10-05 17:46:50 +00:00
e_logf.c Fix catan, catanh, __ieee754_logf in round-downward mode (bug 16799, bug 16800). 2014-04-02 17:41:02 +00:00
e_powf.c Fix powf inaccuracy (bug 21112). 2017-02-07 17:15:47 +00:00
e_rem_pio2f.c Fix leading whitespaces. 2013-06-06 20:36:07 +02:00
e_remainderf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
e_sinhf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_sqrtf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
k_cosf.c Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
k_rem_pio2f.c Get rid of array-bounds warning in __kernel_rem_pio2[f] with gcc 6.1 -O3. 2016-08-18 12:20:35 +02:00
k_sinf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
k_tanf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
lgamma_negf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
lgamma_productf.c Fix lgamma (negative) inaccuracy (bug 2542, bug 2543, bug 2558). 2015-09-10 22:27:58 +00:00
mpn2flt.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_asinhf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_atanf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_cbrtf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_ceilf.c Do not raise "inexact" from generic ceil (bug 15479). 2016-05-24 17:42:10 +00:00
s_copysignf.c Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
s_cosf.c Fix several build failures with GCC6 due to unused static variables. 2015-09-18 20:42:54 +01:00
s_erff.c Work around powerpc32 integer 0 converting to -0 (bug 887, bug 19049, bug 19050). 2015-10-05 17:46:50 +00:00
s_expm1f.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_fabsf.c 2015-05-28 Wilco Dijkstra <wdijkstr@arm.com> 2015-05-28 11:42:55 +01:00
s_finitef.c Reduce number of constants in __finite* (bug 15384). 2015-09-17 16:47:14 +00:00
s_floorf.c Do not raise "inexact" from generic floor (bug 15479). 2016-05-24 17:44:46 +00:00
s_fpclassifyf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_frexpf.c Fix frexp (NaN) (bug 20250). 2016-06-13 17:27:19 +00:00
s_fromfpf_main.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_fromfpf.c Add fromfp functions. 2016-12-31 00:40:59 +00:00
s_fromfpxf.c Add fromfp functions. 2016-12-31 00:40:59 +00:00
s_getpayloadf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_isinff.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_isnanf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_issignalingf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_llrintf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_llroundf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_log1pf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_logbf.c Work around powerpc32 integer 0 converting to -0 (bug 887, bug 19049, bug 19050). 2015-10-05 17:46:50 +00:00
s_lrintf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_lroundf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_modff.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_nearbyintf.c Fix nearbyint scheduling of arithmetic past fesetenv (bug 15490). 2013-05-19 18:40:25 +00:00
s_nextafterf.c Make nextafter, nexttoward set errno (bug 6799). 2015-11-02 18:54:19 +00:00
s_nextupf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_remquof.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_rintf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_roundevenf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_roundf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_scalblnf.c [BZ #6803] Set errno for scalbln, scalbn 2014-06-20 07:48:20 +05:30
s_scalbnf.c Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
s_setpayloadf_main.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_setpayloadf.c Add setpayload, setpayloadf, setpayloadl. 2016-11-19 00:16:28 +00:00
s_setpayloadsigf.c Add setpayloadsig, setpayloadsigf, setpayloadsigl. 2016-11-24 23:56:48 +00:00
s_signbitf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_sincosf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_sinf.c Add optimized sinf and cosf routines for x86 and x86-64 2012-09-03 15:32:13 +02:00
s_tanf.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_tanhf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_totalorderf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_totalordermagf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_truncf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
s_ufromfpf.c Add fromfp functions. 2016-12-31 00:40:59 +00:00
s_ufromfpxf.c Add fromfp functions. 2016-12-31 00:40:59 +00:00
t_exp2f.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
w_expf.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00