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| author | Joseph Myers <joseph@codesourcery.com> | 2014-06-29 11:49:08 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2014-06-29 11:49:08 +0000 |
| commit | edea402804bce917cfd7cd1af76212e6364c23db (patch) | |
| tree | d7688292b5b41de2f5707affccea4b992db30df2 /NEWS | |
| parent | dd0ba018122e88937a5f14b6594b9a40693b2e58 (diff) | |
| download | glibc-edea402804bce917cfd7cd1af76212e6364c23db.zip glibc-edea402804bce917cfd7cd1af76212e6364c23db.tar.gz glibc-edea402804bce917cfd7cd1af76212e6364c23db.tar.bz2 | |
Fix ldbl-128 powl sign of result in overflow / underflow cases (bug 17097).
This patch fixes bug 17097, ldbl-128 powl producing overflowing /
underflowing results with positive sign when the result should have
been negative. This was shown up by the tests in non-default rounding
modes added by my patch for bug 16315, but isn't actually limited to
non-default rounding modes: rather, when rounding to nearest the
wrappers produced a result with the correct sign and so always hid the
bug unless -lieee was used to disable the wrappers. The problem is
that in the cases where Y is large enough that the result overflows or
underflows for X not very close to 1, but not large enough to overflow
or underflow for all X != +/- 1 (in the latter case Y is always an
even integer), a positive overflowing / underflowing result is always
returned, rather than one with the correct sign. This patch moves the
relevant part of computation of the sign earlier and returns a result
of the correct sign.
Tested for mips64.
[BZ #17097]
* sysdeps/ieee754/ldbl-128/e_powl.c (__ieee754_powl): Return
result with correct sign in case of exponents that produce
overflow except for X very close to 1.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 2 |
1 files changed, 1 insertions, 1 deletions
@@ -21,7 +21,7 @@ Version 2.20 16882, 16885, 16888, 16890, 16912, 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958, 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022, 17031, 17042, 17048, 17050, 17058, - 17061, 17062, 17069, 17075, 17079, 17084, 17086, 17092. + 17061, 17062, 17069, 17075, 17079, 17084, 17086, 17092, 17097. * Optimized strchr implementation for AArch64. Contributed by ARM Ltd. |