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[mlir][inliner] Return early if the inliningThreshold is 0U or -1U. #86287

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Mar 22, 2024
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9 changes: 8 additions & 1 deletion mlir/lib/Transforms/InlinerPass.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -93,12 +93,19 @@ InlinerPass::InlinerPass(std::function<void(OpPassManager &)> defaultPipeline,
// Return true if the inlining ratio does not exceed the threshold.
static bool isProfitableToInline(const Inliner::ResolvedCall &resolvedCall,
unsigned inliningThreshold) {
// Return early, ratio <= 0U will always be false.
if (inliningThreshold == 0U)
return false;
// Return early, ratio <= -1U will always be true.
if (inliningThreshold == -1U)
return true;

Region *callerRegion = resolvedCall.sourceNode->getCallableRegion();
Region *calleeRegion = resolvedCall.targetNode->getCallableRegion();

// We should not get external nodes here, but just return true
// for now to preserve the original behavior of the inliner pass.
if (!calleeRegion || !calleeRegion)
if (!callerRegion || !calleeRegion)
return true;

auto countOps = [](Region *region) {
Expand Down