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[DAG] Aggressively cleanup dangling node in CombineZExtLogicopShiftLoad.

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While dangling nodes will eventually be pruned when they are
considered, leaving them disables combines requiring single-use.

Reviewers: Carrot, spatel, craig.topper, RKSimon, efriedma

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D57520

llvm-svn: 352784
This commit is contained in:
Nirav Dave 2019-01-31 19:35:14 +00:00
parent 12cd3e33d7
commit 6f74749663
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -8465,6 +8465,10 @@ SDValue DAGCombiner::CombineZExtLogicopShiftLoad(SDNode *N) {
Load->getValueType(0), ExtLoad);
CombineTo(Load, Trunc, ExtLoad.getValue(1));
}
// N0 is dead at this point.
recursivelyDeleteUnusedNodes(N0.getNode());
return SDValue(N,0); // Return N so it doesn't get rechecked!
}