1 //===- AffineParallelize.cpp - Affineparallelize Pass---------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements a parallelizer for affine loop nests that is able to
10 // perform inner or outer loop parallelization.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "PassDetail.h"
15 #include "mlir/Analysis/AffineStructures.h"
16 #include "mlir/Analysis/LoopAnalysis.h"
17 #include "mlir/Analysis/Utils.h"
18 #include "mlir/Dialect/Affine/IR/AffineOps.h"
19 #include "mlir/Dialect/Affine/IR/AffineValueMap.h"
20 #include "mlir/Dialect/Affine/Passes.h"
21 #include "mlir/Dialect/Affine/Passes.h.inc"
22 #include "mlir/Dialect/Affine/Utils.h"
23 #include "mlir/Transforms/LoopUtils.h"
24 #include "llvm/Support/Debug.h"
25 
26 #define DEBUG_TYPE "affine-parallel"
27 
28 using namespace mlir;
29 
30 namespace {
31 /// Convert all parallel affine.for op into 1-D affine.parallel op.
32 struct AffineParallelize : public AffineParallelizeBase<AffineParallelize> {
33   void runOnFunction() override;
34 };
35 } // namespace
36 
37 void AffineParallelize::runOnFunction() {
38   FuncOp f = getFunction();
39   SmallVector<AffineForOp, 8> parallelizableLoops;
40   f.walk([&](AffineForOp loop) {
41     if (isLoopParallel(loop))
42       parallelizableLoops.push_back(loop);
43   });
44   for (AffineForOp loop : parallelizableLoops)
45     affineParallelize(loop);
46 }
47 
48 std::unique_ptr<OperationPass<FuncOp>> mlir::createAffineParallelizePass() {
49   return std::make_unique<AffineParallelize>();
50 }
51