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author | Joseph Myers <joseph@codesourcery.com> | 2015-11-03 00:11:49 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2015-11-03 00:11:49 +0000 |
commit | 444ec6b8d8091456a2622765ac60f9c60e7755a9 (patch) | |
tree | f070f46708cf30cb4d629348d234fe5735d12f4a /ChangeLog | |
parent | 85422c2acba83852396c9d9fd22ff0493e3606fe (diff) | |
download | glibc-444ec6b8d8091456a2622765ac60f9c60e7755a9.tar.gz glibc-444ec6b8d8091456a2622765ac60f9c60e7755a9.tar.xz glibc-444ec6b8d8091456a2622765ac60f9c60e7755a9.zip |
Fix dbl-64 remainder sign of zero result (bug 19201).
For some large arguments, the dbl-64 implementation of remainder gives zero results with the wrong sign, resulting from a subtraction that is mathematically correct but does not guarantee that a zero result has the sign of the first argument to remainder. This patch adds an appropriate check for this case, similar to other implementations of remainder in the case of equality, and adds tests of remainder on inputs already used to test remquo. Tested for x86_64 and x86. [BZ #19201] * sysdeps/ieee754/dbl-64/e_remainder.c (__ieee754_remainder): Check for zero remainder in case of large exponents and ensure correct sign of result in that case. * math/libm-test.inc (remainder_test_data): Add more tests.
Diffstat (limited to 'ChangeLog')
-rw-r--r-- | ChangeLog | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index d9c0689b6a..f80437100b 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,11 @@ 2015-11-02 Joseph Myers <joseph@codesourcery.com> + [BZ #19201] + * sysdeps/ieee754/dbl-64/e_remainder.c (__ieee754_remainder): + Check for zero remainder in case of large exponents and ensure + correct sign of result in that case. + * math/libm-test.inc (remainder_test_data): Add more tests. + [BZ #6799] * math/s_nextafter.c: Include <errno.h>. (__nextafter): Set errno on overflow and underflow. |