[all-commits] [llvm/llvm-project] 49ab76: [DagCombine] Increase depth by number of operands ...
Alina Sbirlea via All-commits
all-commits at lists.llvm.org
Wed Feb 9 13:35:27 PST 2022
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 49ab760090514dcbf84bd9dc7429146c4ca578ef
https://github.com/llvm/llvm-project/commit/49ab760090514dcbf84bd9dc7429146c4ca578ef
Author: Alina Sbirlea <asbirlea at google.com>
Date: 2022-02-09 (Wed, 09 Feb 2022)
Changed paths:
M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
Log Message:
-----------
[DagCombine] Increase depth by number of operands to avoid a pathological compile time.
We're hitting a pathological compile-time case, profiled to be in
DagCombiner::visitTokenFactor and many inserts into a SmallPtrSet.
It looks like one of the paths around findBetterNeighborChains is not
capped and leads to this.
This patch resolves the issue. Looking for feedback if this solution
looks reasonable.
Differential Revision: https://reviews.llvm.org/D118877
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