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| author | Fangrui Song <maskray@google.com> | 2019-03-07 11:42:59 +0000 |
|---|---|---|
| committer | Fangrui Song <maskray@google.com> | 2019-03-07 11:42:59 +0000 |
| commit | 9ade843ccb88bb1b6266029bce4bb7615b99f669 (patch) | |
| tree | aeb0a536fe007c280c6d0aa4ec1265efe1c6cf5b /llvm/lib/Analysis/CmpInstAnalysis.cpp | |
| parent | ffab84c7df30a37f64aa942d217f0b78a9d07955 (diff) | |
| download | bcm5719-llvm-9ade843ccb88bb1b6266029bce4bb7615b99f669.tar.gz bcm5719-llvm-9ade843ccb88bb1b6266029bce4bb7615b99f669.zip | |
[IDF] Delete a redundant J-edge test
In the DJ-graph based computation of iterated dominance frontiers,
SuccNode->getIDom() == Node is one of the tests to check if (Node,Succ)
is a J-edge. If it is true, since Node is dominated by Root,
SuccLevel = level(Node)+1 > RootLevel
which means the next test SuccLevel > RootLevel will also be true. test
the check is redundant and can be deleted as it also involves one
indirection and provides no speed-up.
llvm-svn: 355589
Diffstat (limited to 'llvm/lib/Analysis/CmpInstAnalysis.cpp')
0 files changed, 0 insertions, 0 deletions
