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| author | Nirav Dave <niravd@google.com> | 2016-03-25 21:06:30 +0000 |
|---|---|---|
| committer | Nirav Dave <niravd@google.com> | 2016-03-25 21:06:30 +0000 |
| commit | fa250cad3715a5df114cc5916e3b6f70560f9116 (patch) | |
| tree | 6823aa57153ca93a14ecd0ba2acf7adf901fdb2b /lldb/packages/Python/lldbsuite/test/functionalities/command_script/welcome.py | |
| parent | 7dcae2e14ad46ce59aa9e283210e098abd773ecc (diff) | |
| download | bcm5719-llvm-fa250cad3715a5df114cc5916e3b6f70560f9116.tar.gz bcm5719-llvm-fa250cad3715a5df114cc5916e3b6f70560f9116.zip | |
Prevent construction of cycle in DAG store merge
When merging stores in DAGCombiner, add check to ensure that no
dependenices exist that would cause the construction of a cycle in our
DAG. This may happen if one store has a data dependence on another
instruction (e.g. a load) which itself has a (chain) dependence on
another store being merged. These stores cannot be merged safely and
doing so results in a cycle that is discovered in LegalizeDAG.
This test is only done in cases where Antialias analysis is used (UseAA)
as non-AA store merge candidates will be merged logically after all
loads which have been checked to not alias.
Reviewers: ahatanak, spatel, niravd, arsenm, hfinkel, tstellarAMD, jyknight
Subscribers: llvm-commits, tberghammer, danalbert, srhines
Differential Revision: http://reviews.llvm.org/D18336
llvm-svn: 264461
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/functionalities/command_script/welcome.py')
0 files changed, 0 insertions, 0 deletions
