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[flang] Enable optimizeEmptyElementals for BufferizeHLFIR pass. #124982

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Merged
merged 1 commit into from
Jan 30, 2025
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[flang] Enable optimizeEmptyElementals for BufferizeHLFIR pass. #124982

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10 changes: 9 additions & 1 deletion flang/lib/Optimizer/Passes/Pipelines.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -245,7 +245,15 @@ void createHLFIRToFIRPassPipeline(mlir::PassManager &pm, bool enableOpenMP,
}
pm.addPass(hlfir::createLowerHLFIROrderedAssignments());
pm.addPass(hlfir::createLowerHLFIRIntrinsics());
pm.addPass(hlfir::createBufferizeHLFIR());

hlfir::BufferizeHLFIROptions bufferizeOptions;
// For opt-for-speed, avoid running any of the loops resulting
// from hlfir.elemental lowering, if the result is an empty array.
// This helps to avoid long running loops for elementals with
// shapes like (0, HUGE).
if (optLevel.isOptimizingForSpeed())
bufferizeOptions.optimizeEmptyElementals = true;
pm.addPass(hlfir::createBufferizeHLFIR(bufferizeOptions));
// Run hlfir.assign inlining again after BufferizeHLFIR,
// because the latter may introduce new hlfir.assign operations,
// e.g. for copying an array into a temporary due to
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