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
..
bits
dbl-64	Fix pow missing underflows (bug 18825).	2015-09-25 22:29:10 +00:00
flt-32	Fix powf inaccuracy (bug 18956).	2015-09-26 00:27:06 +00:00
ldbl-64-128	Make scalbn set errno (bug 6803).	2015-09-16 21:11:00 +00:00
ldbl-96	Fix hypot missing underflows (bug 18803).	2015-09-24 23:43:57 +00:00
ldbl-128	Fix pow missing underflows (bug 18825).	2015-09-25 22:29:10 +00:00
ldbl-128ibm	Fix pow missing underflows (bug 18825).	2015-09-25 22:29:10 +00:00
ldbl-opt	Use math_narrow_eval more consistently.	2015-09-23 18:14:57 +00:00
ieee754.h
k_standard.c
k_standardf.c
k_standardl.c
Makefile
s_lib_version.c
s_matherr.c
s_signgam.c