6b4c122847
This patch adds `getLoopInductionVars`, `getLoopLowerBounds`, `getLoopBounds`, `getLoopSteps` interface methods to `LoopLIkeOpInterface`. The corresponding single value versions have been moved to shared class declaration and have been implemented based on the new interface methods.
84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
//===- ForallToParallel.cpp - scf.forall to scf.parallel loop conversion --===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Transforms SCF.ForallOp's into SCF.ParallelOps's.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "mlir/Dialect/SCF/IR/SCF.h"
|
|
#include "mlir/Dialect/SCF/Transforms/Passes.h"
|
|
#include "mlir/Dialect/SCF/Transforms/Transforms.h"
|
|
#include "mlir/IR/PatternMatch.h"
|
|
|
|
namespace mlir {
|
|
#define GEN_PASS_DEF_SCFFORALLTOPARALLELLOOP
|
|
#include "mlir/Dialect/SCF/Transforms/Passes.h.inc"
|
|
} // namespace mlir
|
|
|
|
using namespace mlir;
|
|
|
|
LogicalResult mlir::scf::forallToParallelLoop(RewriterBase &rewriter,
|
|
scf::ForallOp forallOp,
|
|
scf::ParallelOp *result) {
|
|
OpBuilder::InsertionGuard guard(rewriter);
|
|
rewriter.setInsertionPoint(forallOp);
|
|
|
|
Location loc = forallOp.getLoc();
|
|
if (!forallOp.getOutputs().empty())
|
|
return rewriter.notifyMatchFailure(
|
|
forallOp,
|
|
"only fully bufferized scf.forall ops can be lowered to scf.parallel");
|
|
|
|
// Convert mixed bounds and steps to SSA values.
|
|
SmallVector<Value> lbs = forallOp.getLowerBound(rewriter);
|
|
SmallVector<Value> ubs = forallOp.getUpperBound(rewriter);
|
|
SmallVector<Value> steps = forallOp.getStep(rewriter);
|
|
|
|
// Create empty scf.parallel op.
|
|
auto parallelOp = rewriter.create<scf::ParallelOp>(loc, lbs, ubs, steps);
|
|
rewriter.eraseBlock(¶llelOp.getRegion().front());
|
|
rewriter.inlineRegionBefore(forallOp.getRegion(), parallelOp.getRegion(),
|
|
parallelOp.getRegion().begin());
|
|
// Replace the terminator.
|
|
rewriter.setInsertionPointToEnd(¶llelOp.getRegion().front());
|
|
rewriter.replaceOpWithNewOp<scf::ReduceOp>(
|
|
parallelOp.getRegion().front().getTerminator());
|
|
|
|
// If the mapping attribute is present, propagate to the new parallelOp.
|
|
if (forallOp.getMapping())
|
|
parallelOp->setAttr("mapping", *forallOp.getMapping());
|
|
|
|
// Erase the scf.forall op.
|
|
rewriter.replaceOp(forallOp, parallelOp);
|
|
|
|
if (result)
|
|
*result = parallelOp;
|
|
|
|
return success();
|
|
}
|
|
|
|
namespace {
|
|
struct ForallToParallelLoop final
|
|
: public impl::SCFForallToParallelLoopBase<ForallToParallelLoop> {
|
|
void runOnOperation() override {
|
|
Operation *parentOp = getOperation();
|
|
IRRewriter rewriter(parentOp->getContext());
|
|
|
|
parentOp->walk([&](scf::ForallOp forallOp) {
|
|
if (failed(scf::forallToParallelLoop(rewriter, forallOp))) {
|
|
return signalPassFailure();
|
|
}
|
|
});
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
std::unique_ptr<Pass> mlir::createForallToParallelLoopPass() {
|
|
return std::make_unique<ForallToParallelLoop>();
|
|
}
|