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| author | Michael Kitzan <mkitzan@apple.com> | 2021-04-23 15:03:57 -0700 |
|---|---|---|
| committer | Michael Kitzan <mkitzan@apple.com> | 2021-04-23 16:44:48 -0700 |
| commit | 59f2dd5f1acded46299cc8eee61a3af78036e140 (patch) | |
| tree | 7fc007a27b84e8225add048742aef65c24281f98 /lldb/packages/Python/lldbsuite/test/configuration.py | |
| parent | fc88d927e30de93bf75aef8cd2a835675fe904bc (diff) | |
| download | llvm-59f2dd5f1acded46299cc8eee61a3af78036e140.zip llvm-59f2dd5f1acded46299cc8eee61a3af78036e140.tar.gz llvm-59f2dd5f1acded46299cc8eee61a3af78036e140.tar.bz2 | |
[MachineCSE] Prevent CSE of non-local convergent instrs
At the moment, MachineCSE allows CSE-ing convergent instrs which are
non-local to each other. This can cause illegal codegen as convergent
instrs are control flow dependent. The patch prevents non-local CSE of
convergent instrs by adding a check in isProfitableToCSE and rejecting
CSE-ing if we're considering CSE-ing non-local convergent instrs. We
can still CSE convergent instrs which are in the same control flow
scope, so the patch purposely does not make all convergent instrs
non-CSE candidates in isCSECandidate.
https://reviews.llvm.org/D101187
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