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| author | Joseph Myers <joseph@codesourcery.com> | 2015-05-19 23:44:28 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-05-19 23:44:28 +0000 |
| commit | 3ce2232efb008e129908b9f35c4266991d9361de (patch) | |
| tree | a479c93a0470a331434f1c96b0f365151e7bbd95 /sysdeps | |
| parent | 526af54142db14c1edcd2d80dc1b56d33ff4e8ce (diff) | |
| download | glibc-3ce2232efb008e129908b9f35c4266991d9361de.tar.gz glibc-3ce2232efb008e129908b9f35c4266991d9361de.tar.xz glibc-3ce2232efb008e129908b9f35c4266991d9361de.zip | |
Fix ldbl-96 remquol (finite, Inf) (bug 18244).
ldbl-96 remquol wrongly handles the case where the first argument is finite and the second infinite, because the check for the second argument being a NaN fails to disregard the explicit high mantissa bit and so wrongly interprets an infinity as being a NaN. This patch fixes this by masking off that bit, and improves test coverage for both remainder and remquo (various cases were missing tests, or, as in the case of the bug, were tested only for one of the two functions). Tested for x86_64 and x86. [BZ #18244] * sysdeps/ieee754/ldbl-96/s_remquol.c (__remquol): Ignore explicit high mantissa bit when testing whether P is a NaN. * math/libm-test.inc (remainder_test_data): Add more tests. (remquo_test_data): Likewise.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/ieee754/ldbl-96/s_remquol.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-96/s_remquol.c b/sysdeps/ieee754/ldbl-96/s_remquol.c index 8d6b10ed61..230d0fa57c 100644 --- a/sysdeps/ieee754/ldbl-96/s_remquol.c +++ b/sysdeps/ieee754/ldbl-96/s_remquol.c @@ -44,7 +44,7 @@ __remquol (long double x, long double p, int *quo) return (x * p) / (x * p); /* p = 0 */ if ((ex == 0x7fff) /* x not finite */ || ((ep == 0x7fff) /* p is NaN */ - && ((hp | lp) != 0))) + && (((hp & 0x7fffffff) | lp) != 0))) return (x * p) / (x * p); if (ep <= 0x7ffb) |