forked from OSchip/llvm-project
8b5de48d62
Summary: Previously, in the NewPM pipeline, TailCallElim recalculates the DomTree when it modifies any instruction in the Function. For example, ``` CallInst *CI = dyn_cast<CallInst>(&I); ... CI->setTailCall(); Modified = true; ... if (!Modified || ...) return PreservedAnalyses::all(); ``` After applying this patch, the DomTree only recalculates if needed (plus an extra insertEdge() + an extra deleteEdge() call). When optimizing SQLite with `-passes="default<O3>"` pipeline of the newPM, the number of DomTree recalculation decreases by 6.2%, the number of nodes visited by DFS decreases by 2.9%. The time used by DomTree will decrease approximately 1%~2.5% after applying the patch. Statistics: ``` Before the patch: 23010 dom-tree-stats - Number of DomTree recalculations 489264 dom-tree-stats - Number of nodes visited by DFS -- DomTree After the patch: 21581 dom-tree-stats - Number of DomTree recalculations 475088 dom-tree-stats - Number of nodes visited by DFS -- DomTree ``` Reviewers: kuhar, dmgreen, brzycki, grosser, davide Reviewed By: kuhar, brzycki Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D49982 llvm-svn: 338954 |
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| .. | ||
| 2010-06-26-MultipleReturnValues.ll | ||
| EraseBB.ll | ||
| accum_recursion.ll | ||
| ackermann.ll | ||
| basic.ll | ||
| debugloc.ll | ||
| deopt-bundle.ll | ||
| dont_reorder_load.ll | ||
| dup_tail.ll | ||
| inf-recursion.ll | ||
| notail.ll | ||
| opt-remarks-recursion.ll | ||
| reorder_load.ll | ||
| setjmp.ll | ||