[Mlir-commits] [mlir] [SCFToAffine] Add a pass to raise scf to affine ops. (PR #152925)

[lonely eagle]

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@@ -0,0 +1,133 @@
+//===- SCFToAffine.cpp - SCF to Affine 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a pass to raise scf.for, scf.if and loop.terminator
+// ops into affine ops.
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Conversion/SCFToAffine/SCFToAffine.h"
+#include "mlir/Dialect/Affine/IR/AffineOps.h"
+#include "mlir/Dialect/SCF/IR/SCF.h"
+#include "mlir/IR/Verifier.h"
+#include "mlir/Transforms/Passes.h"
+#include "mlir/Transforms/WalkPatternRewriteDriver.h"
+
+namespace mlir {
+#define GEN_PASS_DEF_RAISESCFTOAFFINEPASS
+#include "mlir/Conversion/Passes.h.inc"
+} // namespace mlir
+
+#define DEBUG_TYPE "raise-scf-to-affine"
+
+using namespace mlir;
+
+namespace {
+
+struct SCFToAffinePass
+    : public impl::RaiseSCFToAffinePassBase<SCFToAffinePass> {
+  void runOnOperation() override;
+};
+
+bool canRaiseToAffine(scf::ForOp op) {
+  return affine::isValidDim(op.getLowerBound()) &&
+         affine::isValidDim(op.getUpperBound()) &&
+         affine::isValidSymbol(op.getStep());
+}
+
+struct ForOpRewrite : public OpRewritePattern<scf::ForOp> {
+  using OpRewritePattern<scf::ForOp>::OpRewritePattern;
+
+  std::pair<affine::AffineForOp, Value>
+  createAffineFor(scf::ForOp op, PatternRewriter &rewriter) const {
+    if (auto constantStep = op.getStep().getDefiningOp<arith::ConstantOp>()) {
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linuxlonelyeagle wrote:

Match constant using `m_ConstantInt`.

https://github.com/llvm/llvm-project/pull/152925