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//===-------- TestLoopUnrolling.cpp --- loop unrolling test pass ----------===//
//
// 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 unroll loops by a specified unroll factor.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/SCF/IR/SCF.h"
#include "mlir/Dialect/SCF/Utils/Utils.h"
#include "mlir/IR/Builders.h"
#include "mlir/Pass/Pass.h"
using namespace mlir;
namespace {
static unsigned getNestingDepth(Operation *op) {
Operation *currOp = op;
unsigned depth = 0;
while ((currOp = currOp->getParentOp())) {
if (isa<scf::ForOp>(currOp))
depth++;
}
return depth;
}
struct TestLoopUnrollingPass
: public PassWrapper<TestLoopUnrollingPass, OperationPass<>> {
MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestLoopUnrollingPass)
StringRef getArgument() const final { return "test-loop-unrolling"; }
StringRef getDescription() const final {
return "Tests loop unrolling transformation";
}
TestLoopUnrollingPass() = default;
TestLoopUnrollingPass(const TestLoopUnrollingPass &) {}
explicit TestLoopUnrollingPass(uint64_t unrollFactorParam,
unsigned loopDepthParam,
bool annotateLoopParam) {
unrollFactor = unrollFactorParam;
loopDepth = loopDepthParam;
annotateLoop = annotateLoopParam;
}
void getDependentDialects(DialectRegistry ®istry) const override {
registry.insert<arith::ArithDialect>();
}
void runOnOperation() override {
SmallVector<scf::ForOp, 4> loops;
getOperation()->walk([&](scf::ForOp forOp) {
if (getNestingDepth(forOp) == loopDepth)
loops.push_back(forOp);
});
auto annotateFn = [this](unsigned i, Operation *op, OpBuilder b) {
if (annotateLoop) {
op->setAttr("unrolled_iteration", b.getUI32IntegerAttr(i));
}
};
for (auto loop : loops)
(void)loopUnrollByFactor(loop, unrollFactor, annotateFn);
}
Option<uint64_t> unrollFactor{*this, "unroll-factor",
llvm::cl::desc("Loop unroll factor."),
llvm::cl::init(1)};
Option<bool> annotateLoop{*this, "annotate",
llvm::cl::desc("Annotate unrolled iterations."),
llvm::cl::init(false)};
Option<bool> unrollUpToFactor{*this, "unroll-up-to-factor",
llvm::cl::desc("Loop unroll up to factor."),
llvm::cl::init(false)};
Option<unsigned> loopDepth{*this, "loop-depth", llvm::cl::desc("Loop depth."),
llvm::cl::init(0)};
};
} // namespace
namespace mlir {
namespace test {
void registerTestLoopUnrollingPass() {
PassRegistration<TestLoopUnrollingPass>();
}
} // namespace test
} // namespace mlir
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