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68e9721aa8
Several things were suggested in post-submission reviews. In particular, use pointers in function interfaces instead of references (still use references internally). Clarify the behavior of the pass in presence of MLFunctions. PiperOrigin-RevId: 222556851
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
//===- LowerAffineApply.cpp - Convert affine_apply to primitives ----------===//
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//
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// Copyright 2019 The MLIR Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// =============================================================================
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//
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// This file defines an MLIR function pass that replaces affine_apply operations
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// in CFGFunctions with sequences of corresponding elementary arithmetic
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// operations.
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//
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//===----------------------------------------------------------------------===//
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//
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#include "mlir/IR/Builders.h"
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#include "mlir/IR/BuiltinOps.h"
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#include "mlir/IR/CFGFunction.h"
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#include "mlir/IR/MLFunction.h"
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#include "mlir/Pass.h"
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#include "mlir/Transforms/LoweringUtils.h"
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#include "mlir/Transforms/Passes.h"
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using namespace mlir;
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namespace {
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struct LowerAffineApply : public FunctionPass {
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explicit LowerAffineApply() : FunctionPass(&LowerAffineApply::passID) {}
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PassResult runOnMLFunction(MLFunction *f) override;
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PassResult runOnCFGFunction(CFGFunction *f) override;
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static char passID;
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};
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} // end anonymous namespace
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char LowerAffineApply::passID = 0;
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PassResult LowerAffineApply::runOnMLFunction(MLFunction *f) {
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f->emitError("ML Functions contain syntactically hidden affine_apply's that "
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"cannot be expanded");
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return failure();
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}
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PassResult LowerAffineApply::runOnCFGFunction(CFGFunction *f) {
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for (BasicBlock &bb : *f) {
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// Handle iterators with care because we erase in the same loop.
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// In particular, step to the next element before erasing the current one.
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for (auto it = bb.begin(); it != bb.end();) {
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Instruction &inst = *it;
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OpPointer<AffineApplyOp> affineApplyOp = inst.dyn_cast<AffineApplyOp>();
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++it;
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if (!affineApplyOp)
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continue;
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if (expandAffineApply(&*affineApplyOp))
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return failure();
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}
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}
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return success();
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}
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static PassRegistration<LowerAffineApply>
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pass("lower-affine-apply",
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"Decompose affine_applies into primitive operations");
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FunctionPass *createLowerAffineApplyPass() { return new LowerAffineApply(); }
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