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//===- CompositePass.cpp - Composite pass code ----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// CompositePass allows to run set of passes until fixed point is reached.
//
//===----------------------------------------------------------------------===//
#include "mlir/Transforms/Passes.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Pass/PassManager.h"
namespace mlir {
#define GEN_PASS_DEF_COMPOSITEFIXEDPOINTPASS
#include "mlir/Transforms/Passes.h.inc"
} // namespace mlir
using namespace mlir;
namespace {
struct CompositeFixedPointPass final
: public impl::CompositeFixedPointPassBase<CompositeFixedPointPass> {
using CompositeFixedPointPassBase::CompositeFixedPointPassBase;
CompositeFixedPointPass(
std::string name_, llvm::function_ref<void(OpPassManager &)> populateFunc,
int maxIterations) {
name = std::move(name_);
maxIter = maxIterations;
populateFunc(dynamicPM);
llvm::raw_string_ostream os(pipelineStr);
llvm::interleave(
dynamicPM, [&](mlir::Pass &pass) { pass.printAsTextualPipeline(os); },
[&]() { os << ","; });
}
LogicalResult initializeOptions(
StringRef options,
function_ref<LogicalResult(const Twine &)> errorHandler) override {
if (failed(CompositeFixedPointPassBase::initializeOptions(options,
errorHandler)))
return failure();
if (failed(parsePassPipeline(pipelineStr, dynamicPM)))
return errorHandler("Failed to parse composite pass pipeline");
return success();
}
LogicalResult initialize(MLIRContext *context) override {
if (maxIter <= 0)
return emitError(UnknownLoc::get(context))
<< "Invalid maxIterations value: " << maxIter << "\n";
return success();
}
void getDependentDialects(DialectRegistry ®istry) const override {
dynamicPM.getDependentDialects(registry);
}
void runOnOperation() override {
auto op = getOperation();
OperationFingerPrint fp(op);
int currentIter = 0;
int maxIterVal = maxIter;
while (true) {
if (failed(runPipeline(dynamicPM, op)))
return signalPassFailure();
if (currentIter++ >= maxIterVal) {
op->emitWarning("Composite pass \"" + llvm::Twine(name) +
"\"+ didn't converge in " + llvm::Twine(maxIterVal) +
" iterations");
break;
}
OperationFingerPrint newFp(op);
if (newFp == fp)
break;
fp = newFp;
}
}
protected:
llvm::StringRef getName() const override { return name; }
private:
OpPassManager dynamicPM;
};
} // namespace
std::unique_ptr<Pass> mlir::createCompositeFixedPointPass(
std::string name, llvm::function_ref<void(OpPassManager &)> populateFunc,
int maxIterations) {
return std::make_unique<CompositeFixedPointPass>(std::move(name),
populateFunc, maxIterations);
}
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