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| author | Jonathan Peyton <jonathan.l.peyton@intel.com> | 2018-12-13 23:18:55 +0000 |
|---|---|---|
| committer | Jonathan Peyton <jonathan.l.peyton@intel.com> | 2018-12-13 23:18:55 +0000 |
| commit | 76357147329374a5768f1a7488d17f7c84b55ffe (patch) | |
| tree | 275ce16096b28b83edc317317e8835e6ee04584b /runtime/src/kmp_tasking.cpp | |
| parent | 09185848651b1cfab16634c40b3151ec5dad9567 (diff) | |
[OpenMP] Fix transient divide by zero bug in 32-bit code
The value returned by __kmp_now_nsec() can overflow 32-bit values causing
incorrect values to be returned. The overflow can end up causing a divide
by zero error because in __kmp_initialize_system_tick(), the value
(__kmp_now_nsec() - nsec) can end up being much larger than the numerator:
1e6 * (delay + (now - goal))
during a pathological timing where the current time calculated is much larger
than nsec. When this happens, the value of __kmp_ticks_per_msec is set to zero
which is then used as the denominator in the KMP_NOW_MSEC() macro leading to
the divide by zero error.
Differential Revision: https://reviews.llvm.org/D55300
git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@349090 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'runtime/src/kmp_tasking.cpp')
0 files changed, 0 insertions, 0 deletions