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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-07-27 12:23:36 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2019-07-27 12:23:36 +0000 |
| commit | 3ff6126487ddc7636af83c70ee11a586d83ed59a (patch) | |
| tree | 09320275072bba49ae2688d6b9538f763fec1691 /llvm/lib/CodeGen | |
| parent | 6faac434ed6767c50b2bb3a9552982bcfb252dc8 (diff) | |
| download | bcm5719-llvm-3ff6126487ddc7636af83c70ee11a586d83ed59a.tar.gz bcm5719-llvm-3ff6126487ddc7636af83c70ee11a586d83ed59a.zip | |
[TargetLowering] Add depth limit to SimplifyMultipleUseDemandedBits
We're getting reports of massive compile time increases because SimplifyMultipleUseDemandedBits was losing track of the depth and not earlying-out. No repro yet, but consider this a pre-emptive commit.
llvm-svn: 367169
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp index 6bfb388a3f7..1173beb9ac6 100644 --- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp @@ -569,6 +569,9 @@ bool TargetLowering::SimplifyDemandedBits(SDValue Op, const APInt &DemandedBits, SDValue TargetLowering::SimplifyMultipleUseDemandedBits( SDValue Op, const APInt &DemandedBits, const APInt &DemandedElts, SelectionDAG &DAG, unsigned Depth) const { + if (Depth == 6) // Limit search depth. + return SDValue(); + KnownBits LHSKnown, RHSKnown; switch (Op.getOpcode()) { case ISD::AND: { |
