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| author | Jakub Kuderski <kubakuderski@gmail.com> | 2018-07-31 15:53:10 +0000 |
|---|---|---|
| committer | Jakub Kuderski <kubakuderski@gmail.com> | 2018-07-31 15:53:10 +0000 |
| commit | 3ae770aa2be9f8b6c9da5c8dc84748a7fdbd33f4 (patch) | |
| tree | 577e9bb27790bee7af1b76c0f10fce0549d6fd84 /llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp | |
| parent | d83beb804cbd9dab502314494ea3386fc3e0807f (diff) | |
| download | llvm-3ae770aa2be9f8b6c9da5c8dc84748a7fdbd33f4.zip llvm-3ae770aa2be9f8b6c9da5c8dc84748a7fdbd33f4.tar.gz llvm-3ae770aa2be9f8b6c9da5c8dc84748a7fdbd33f4.tar.bz2 | |
[Dominators] Make slow walks shorter
Summary:
When DFS numbers are not yet calculated for a dominator tree, we have to walk it up to say whether one node dominates some other.
This patch makes the slow walks shorter by only walking until the level of the node we check against is reached. This is because a node cannot possibly dominate something higher in its tree.
When running opt with -O3, the patch results in:
* 25% fewer loop iterations for `opt` (fullLTO)
* 30% fewer loop iterations for sqlite
Reviewers: brzycki, asbirlea, chandlerc, NutshellySima, grosser
Reviewed By: NutshellySima
Subscribers: mehdi_amini, dexonsmith, llvm-commits
Differential Revision: https://reviews.llvm.org/D49955
llvm-svn: 338396
Diffstat (limited to 'llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp')
0 files changed, 0 insertions, 0 deletions