TestSCFUtils.cpp
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//===- TestSCFUtils.cpp --- Pass to test independent SCF dialect utils ----===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements a pass to test SCF dialect utils.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/SCF/SCF.h"
#include "mlir/Dialect/SCF/Utils.h"
#include "mlir/IR/Builders.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/Passes.h"
#include "llvm/ADT/SetVector.h"
using namespace mlir;
namespace {
class TestSCFUtilsPass : public PassWrapper<TestSCFUtilsPass, FunctionPass> {
public:
explicit TestSCFUtilsPass() {}
void runOnFunction() override {
FuncOp func = getFunction();
SmallVector<scf::ForOp, 4> toErase;
func.walk([&](Operation *fakeRead) {
if (fakeRead->getName().getStringRef() != "fake_read")
return;
auto *fakeCompute = fakeRead->getResult(0).use_begin()->getOwner();
auto *fakeWrite = fakeCompute->getResult(0).use_begin()->getOwner();
auto loop = fakeRead->getParentOfType<scf::ForOp>();
OpBuilder b(loop);
loop.moveOutOfLoop({fakeRead});
fakeWrite->moveAfter(loop);
auto newLoop = cloneWithNewYields(b, loop, fakeRead->getResult(0),
fakeCompute->getResult(0));
fakeCompute->getResult(0).replaceAllUsesWith(
newLoop.getResults().take_back()[0]);
toErase.push_back(loop);
});
for (auto loop : llvm::reverse(toErase))
loop.erase();
}
};
} // end namespace
namespace mlir {
void registerTestSCFUtilsPass() {
PassRegistration<TestSCFUtilsPass>("test-scf-utils", "test scf utils");
}
} // namespace mlir