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[mlir][SCFToOpenMP] Use walk pattern driver #155242

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Merged
merged 1 commit into from
Aug 26, 2025
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[mlir][SCFToOpenMP] Use walk pattern driver #155242

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17 changes: 10 additions & 7 deletions mlir/lib/Conversion/SCFToOpenMP/SCFToOpenMP.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@
#include "mlir/Dialect/SCF/IR/SCF.h"
#include "mlir/IR/SymbolTable.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/DialectConversion.h"
#include "mlir/Transforms/WalkPatternRewriteDriver.h"

namespace mlir {
#define GEN_PASS_DEF_CONVERTSCFTOOPENMPPASS
Expand Down Expand Up @@ -538,15 +538,18 @@ struct ParallelOpLowering : public OpRewritePattern<scf::ParallelOp> {

/// Applies the conversion patterns in the given function.
static LogicalResult applyPatterns(ModuleOp module, unsigned numThreads) {
ConversionTarget target(*module.getContext());
target.addIllegalOp<scf::ReduceOp, scf::ReduceReturnOp, scf::ParallelOp>();
target.addLegalDialect<omp::OpenMPDialect, LLVM::LLVMDialect,
memref::MemRefDialect>();

RewritePatternSet patterns(module.getContext());
patterns.add<ParallelOpLowering>(module.getContext(), numThreads);
FrozenRewritePatternSet frozen(std::move(patterns));
return applyPartialConversion(module, target, frozen);
walkAndApplyPatterns(module, frozen);
auto status = module.walk([](Operation *op) {
if (isa<scf::ReduceOp, scf::ReduceReturnOp, scf::ParallelOp>(op)) {
op->emitError("unconverted operation found");
return WalkResult::interrupt();
}
return WalkResult::advance();
});
return failure(status.wasInterrupted());
}

/// A pass converting SCF operations to OpenMP operations.
Expand Down