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glibc/sysdeps/ieee754/flt-32
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Joseph Myers fa752c6981 Fix powf inaccuracy (bug 18956). 
The flt-32 version of powf can be inaccurate because of bugs in the
extra-precision calculation of (x-1)/(x+1) or (x-1.5)/(x+1.5) as part
of calculating log(x) with extra precision: a constant used (as part
of adding 1 or 1.5 through integer arithmetic) is incorrect, and then
the code fails to mask a computed high part before using it in
arithmetic that relies on s_h*t_h being exactly representable.  This
patch fixes these bugs.

Tested for x86_64 and x86.  x86_64 ulps for powf removed and
regenerated to reflect reduced ulps from the increased accuracy for
existing tests.

	[BZ #18956]
	* sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): Add 0x00400000
	not 0x0040000 for high bit of mantissa.  Mask with 0xfffff000 when
	extracting high part.
	* math/auto-libm-test-in: Add another test of pow.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/x86_64/fpu/libm-test-ulps: Update.
2015-09-26 00:27:06 +00:00
..
e_acosf.c
e_acoshf.c
e_asinf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_atan2f.c
e_atanhf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +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 Don't use volatile in exp2f. 2015-09-23 22:52:13 +00:00
e_expf.c This patch renames all uses of __isinf*, __isnan*, __finite* and __signbit* to use standard C99 macros. This has no effect on generated code. 2015-06-03 15:41:36 +01:00
e_fmodf.c
e_gammaf_r.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_hypotf.c Simplify hypotf infinity handling (bug 15918). 2015-09-15 17:24:23 +00:00
e_ilogbf.c
e_j0f.c Avoid uninitialized warnings in Bessel functions. 2015-02-26 21:49:19 +00:00
e_j1f.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_jnf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_lgammaf_r.c Avoid excess range overflowing results from cosh, sinh, lgamma (bug 18980). 2015-09-18 20:00:48 +00:00
e_log2f.c
e_log10f.c Fix several build failures with GCC6 due to unused static variables. 2015-09-18 20:42:54 +01:00
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 18956). 2015-09-26 00:27:06 +00:00
e_rem_pio2f.c Fix leading whitespaces. 2013-06-06 20:36:07 +02:00
e_remainderf.c
e_sinhf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
e_sqrtf.c
k_cosf.c Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
k_rem_pio2f.c Use math_narrow_eval more consistently. 2015-09-23 18:14:57 +00:00
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 Use math_narrow_eval more consistently. 2015-09-23 18:14:57 +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. 2015-01-02 16:29:47 +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. 2015-01-02 16:29:47 +00:00
s_ceilf.c
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 Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +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
s_fpclassifyf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_frexpf.c Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
s_isinff.c
s_isnanf.c
s_issignalingf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_llrintf.c Use math_narrow_eval more consistently. 2015-09-23 18:14:57 +00:00
s_llroundf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_log1pf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_logbf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_lrintf.c Use math_narrow_eval more consistently. 2015-09-23 18:14:57 +00:00
s_lroundf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_modff.c
s_nearbyintf.c
s_nextafterf.c Fix nextafter overflow in non-default rounding modes (bug 16677). 2014-03-11 22:24:00 +00:00
s_remquof.c Fix sign of remquo zero remainder in round-downward mode (bug 17987). 2015-02-17 00:41:50 +00:00
s_rintf.c
s_roundf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +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_signbitf.c Use the GCC builtin functions for the non-inlined signbit implementations. 2015-09-18 16:39:08 +01:00
s_sincosf.c Fix sincos errno setting (bug 15467). 2015-02-11 23:17:25 +00:00
s_sinf.c
s_tanf.c
s_tanhf.c Refactor code forcing underflow exceptions. 2015-09-23 22:42:30 +00:00
s_truncf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
t_exp2f.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
w_expf.c This patch renames all uses of __isinf*, __isnan*, __finite* and __signbit* to use standard C99 macros. This has no effect on generated code. 2015-06-03 15:41:36 +01:00