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| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-25 21:46:02 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-25 21:46:02 +0000 |
| commit | a8e2112ae3e57fae592d84af2936a61d6239a248 (patch) | |
| tree | c9a07fad850af11667fffc681b0c5d96c9fe7e3a /ChangeLog | |
| parent | 037e4b993fe03d33055f92dddf7242abd9f6d1de (diff) | |
| download | glibc-a8e2112ae3e57fae592d84af2936a61d6239a248.tar.gz | |
Use round-to-nearest internally in jn, test with ALL_RM_TEST (bug 18602).
Some existing jn tests, if run in non-default rounding modes, produce
errors above those accepted in glibc, which causes problems for moving
tests of jn to use ALL_RM_TEST. This patch makes jn set rounding
to-nearest internally, as was done for yn some time ago, then computes
the appropriate underflowing value for results that underflowed to
zero in to-nearest, and moves the tests to ALL_RM_TEST. It does
nothing about the general inaccuracy of Bessel function
implementations in glibc, though it should make jn more accurate on
average in non-default rounding modes through reduced error
accumulation. The recomputation of results that underflowed to zero
should as a side-effect fix some cases of bug 16559, where jn just
used an exact zero, but that is *not* the goal of this patch and other
cases of that bug remain unfixed.
(Most of the changes in the patch are reindentation to add new scopes
for SET_RESTORE_ROUND*.)
Tested for x86_64, x86, powerpc and mips64.
[BZ #16559]
[BZ #18602]
* sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_jn): Set
round-to-nearest internally then recompute results that
underflowed to zero in the original rounding mode.
* sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_jnf): Likewise.
* sysdeps/ieee754/ldbl-128/e_jnl.c (__ieee754_jnl): Likewise.
* sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_jnl): Likewise.
* sysdeps/ieee754/ldbl-96/e_jnl.c (__ieee754_jnl): Likewise
* math/libm-test.inc (jn_test): Use ALL_RM_TEST.
* sysdeps/i386/fpu/libm-test-ulps: Update.
* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 15 |
1 files changed, 15 insertions, 0 deletions
@@ -1,3 +1,18 @@ +2015-06-25 Joseph Myers <joseph@codesourcery.com> + + [BZ #16559] + [BZ #18602] + * sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_jn): Set + round-to-nearest internally then recompute results that + underflowed to zero in the original rounding mode. + * sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_jnf): Likewise. + * sysdeps/ieee754/ldbl-128/e_jnl.c (__ieee754_jnl): Likewise. + * sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_jnl): Likewise. + * sysdeps/ieee754/ldbl-96/e_jnl.c (__ieee754_jnl): Likewise + * math/libm-test.inc (jn_test): Use ALL_RM_TEST. + * sysdeps/i386/fpu/libm-test-ulps: Update. + * sysdeps/x86_64/fpu/libm-test-ulps: Likewise. + 2015-06-25 Andrew Senkevich <andrew.senkevich@intel.com> * NEWS: Fixed description of link with vector math library. |