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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 | bdb0a2ffaa18ea494ce81c32cb4454ad57735946 (patch) | |
| tree | ddb450f7d71fe1a32217360a605744420eb84ce3 /llvm/lib/Object/ModuleSymbolTable.cpp | |
| parent | 6d88e049dc51be8a9ba2e853e17fdf8c4fa6026b (diff) | |
| download | llvm-bdb0a2ffaa18ea494ce81c32cb4454ad57735946.zip llvm-bdb0a2ffaa18ea494ce81c32cb4454ad57735946.tar.gz llvm-bdb0a2ffaa18ea494ce81c32cb4454ad57735946.tar.bz2 | |
[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
llvm-svn: 349090
Diffstat (limited to 'llvm/lib/Object/ModuleSymbolTable.cpp')
0 files changed, 0 insertions, 0 deletions