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[mlir][Affine] Add helper functions to allow reordering affine.apply operands and decompose the ops into smaller components

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Care is taken to order operands from least hoistable to most hoistable and to process subexpressions in the same
order.

This allows exposing more oppportunities for licm, cse and strength reduction.

Such a step should typically be applied while we still have loops in the IR and just before lowering affine ops to arith.
This is because the affine.apply canonicalization currently tries to maximally compose chains of affine.apply operations
and could undo the effects of these decompositions.

Depends on: D145784

Differential Revision: https://reviews.llvm.org/D145685
This commit is contained in:
Nicolas Vasilache 2023-03-13 12:29:10 -07:00
parent 5b86eaeb7e
commit 0fa20ecafe
9 changed files with 437 additions and 4 deletions
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5
mlir/include/mlir/Dialect/Affine/Passes.h
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@ -18,6 +18,7 @@
#include <limits>
namespace mlir {
namespace func {
class FuncOp;
} // namespace func
@ -110,10 +111,6 @@ createLoopUnrollAndJamPass(int unrollJamFactor = -1);
/// memory hierarchy.
std::unique_ptr<OperationPass<func::FuncOp>> createPipelineDataTransferPass();
/// Populate patterns that expand affine index operations into more fundamental
/// operations (not necessarily restricted to Affine dialect).
void populateAffineExpandIndexOpsPatterns(RewritePatternSet &patterns);
/// Creates a pass to expand affine index operations into more fundamental
/// operations (not necessarily restricted to Affine dialect).
std::unique_ptr<Pass> createAffineExpandIndexOpsPass();

45
mlir/include/mlir/Dialect/Affine/Transforms/Transforms.h Normal file
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@ -0,0 +1,45 @@
//===- Transforms.h - Transforms Entrypoints --------------------*- C++ -*-===//
//
// 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 header file defines a set of transforms specific for the AffineOps
// dialect.
//
//===----------------------------------------------------------------------===//
#ifndef MLIR_DIALECT_AFFINE_TRANSFORMS_TRANSFORMS_H
#define MLIR_DIALECT_AFFINE_TRANSFORMS_TRANSFORMS_H
#include "mlir/Support/LogicalResult.h"
namespace mlir {
class RewritePatternSet;
class RewriterBase;
class AffineApplyOp;
/// Populate patterns that expand affine index operations into more fundamental
/// operations (not necessarily restricted to Affine dialect).
void populateAffineExpandIndexOpsPatterns(RewritePatternSet &patterns);
/// Helper function to rewrite `op`'s affine map and reorder its operands such
/// that they are in increasing order of hoistability (i.e. the least hoistable)
/// operands come first in the operand list.
void reorderOperandsByHoistability(RewriterBase &rewriter, AffineApplyOp op);
/// Split an "affine.apply" operation into smaller ops.
/// This reassociates a large AffineApplyOp into an ordered list of smaller
/// AffineApplyOps. This can be used right before lowering affine ops to arith
/// to exhibit more opportunities for CSE and LICM.
/// Return the sink AffineApplyOp on success or failure if `op` does not
/// decompose into smaller AffineApplyOps.
/// Note that this can be undone by canonicalization which tries to
/// maximally compose chains of AffineApplyOps.
FailureOr<AffineApplyOp> decompose(RewriterBase &rewriter, AffineApplyOp op);
} // namespace mlir
#endif // MLIR_DIALECT_AFFINE_TRANSFORMS_TRANSFORMS_H

1
mlir/lib/Dialect/Affine/Transforms/AffineExpandIndexOps.cpp
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@ -13,6 +13,7 @@
#include "mlir/Dialect/Affine/Passes.h"
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Affine/Transforms/Transforms.h"
#include "mlir/Dialect/Affine/Utils.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"

1
mlir/lib/Dialect/Affine/Transforms/CMakeLists.txt
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@ -5,6 +5,7 @@ add_mlir_dialect_library(MLIRAffineTransforms
AffineLoopNormalize.cpp
AffineParallelize.cpp
AffineScalarReplacement.cpp
DecomposeAffineOps.cpp
LoopCoalescing.cpp
LoopFusion.cpp
LoopTiling.cpp

173
mlir/lib/Dialect/Affine/Transforms/DecomposeAffineOps.cpp Normal file
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@ -0,0 +1,173 @@
//===- DecomposeAffineOps.cpp - Decompose affine ops into finer-grained ---===//
//
// 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 functionality to progressively decompose coarse-grained
// affine ops into finer-grained ops.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Affine/Transforms/Transforms.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
#include "llvm/Support/Debug.h"
using namespace mlir;
#define DEBUG_TYPE "decompose-affine-ops"
#define DBGS() (llvm::dbgs() << "[" DEBUG_TYPE "]: ")
#define DBGSNL() (llvm::dbgs() << "\n")
/// Count the number of loops surrounding `operand` such that operand could be
/// hoisted above.
/// Stop counting at the first loop over which the operand cannot be hoisted.
static int64_t numEnclosingInvariantLoops(OpOperand &operand) {
int64_t count = 0;
Operation *currentOp = operand.getOwner();
while (auto loopOp = currentOp->getParentOfType<LoopLikeOpInterface>()) {
if (!loopOp.isDefinedOutsideOfLoop(operand.get()))
break;
currentOp = loopOp;
count++;
}
return count;
}
void mlir::reorderOperandsByHoistability(RewriterBase &rewriter,
AffineApplyOp op) {
SmallVector<int64_t> numInvariant = llvm::to_vector(
llvm::map_range(op->getOpOperands(), [&](OpOperand &operand) {
return numEnclosingInvariantLoops(operand);
}));
int64_t numOperands = op.getNumOperands();
SmallVector<int64_t> operandPositions =
llvm::to_vector(llvm::seq<int64_t>(0, numOperands));
std::sort(operandPositions.begin(), operandPositions.end(),
[&numInvariant](size_t i1, size_t i2) {
return numInvariant[i1] > numInvariant[i2];
});
SmallVector<AffineExpr> replacements(numOperands);
SmallVector<Value> operands(numOperands);
for (int64_t i = 0; i < numOperands; ++i) {
operands[i] = op.getOperand(operandPositions[i]);
replacements[operandPositions[i]] = getAffineSymbolExpr(i, op.getContext());
}
AffineMap map = op.getAffineMap();
ArrayRef<AffineExpr> repls{replacements};
map = map.replaceDimsAndSymbols(repls.take_front(map.getNumDims()),
repls.drop_front(map.getNumDims()),
/*numResultDims=*/0,
/*numResultSyms=*/numOperands);
map = AffineMap::get(0, numOperands,
simplifyAffineExpr(map.getResult(0), 0, numOperands),
op->getContext());
canonicalizeMapAndOperands(&map, &operands);
rewriter.startRootUpdate(op);
op.setMap(map);
op->setOperands(operands);
rewriter.finalizeRootUpdate(op);
}
/// Build an affine.apply that is a subexpression `expr` of `originalOp`s affine
/// map and with the same operands.
/// Canonicalize the map and operands to deduplicate and drop dead operands
/// before returning but do not perform maximal composition of AffineApplyOp
/// which would defeat the purpose.
static AffineApplyOp createSubApply(RewriterBase &rewriter,
AffineApplyOp originalOp, AffineExpr expr) {
MLIRContext *ctx = originalOp->getContext();
AffineMap m = originalOp.getAffineMap();
auto rhsMap = AffineMap::get(m.getNumDims(), m.getNumSymbols(), expr, ctx);
SmallVector<Value> rhsOperands = originalOp->getOperands();
canonicalizeMapAndOperands(&rhsMap, &rhsOperands);
return rewriter.create<AffineApplyOp>(originalOp.getLoc(), rhsMap,
rhsOperands);
}
FailureOr<AffineApplyOp> mlir::decompose(RewriterBase &rewriter,
AffineApplyOp op) {
// 1. Preconditions: only handle dimensionless AffineApplyOp maps with a
// top-level binary expression that we can reassociate (i.e. add or mul).
AffineMap m = op.getAffineMap();
if (m.getNumDims() > 0)
return rewriter.notifyMatchFailure(op, "expected no dims");
AffineExpr remainingExp = m.getResult(0);
auto binExpr = remainingExp.dyn_cast<AffineBinaryOpExpr>();
if (!binExpr)
return rewriter.notifyMatchFailure(op, "terminal affine.apply");
if (!binExpr.getLHS().isa<AffineBinaryOpExpr>() &&
!binExpr.getRHS().isa<AffineBinaryOpExpr>())
return rewriter.notifyMatchFailure(op, "terminal affine.apply");
bool supportedKind = ((binExpr.getKind() == AffineExprKind::Add) ||
(binExpr.getKind() == AffineExprKind::Mul));
if (!supportedKind)
return rewriter.notifyMatchFailure(
op, "only add or mul binary expr can be reassociated");
LLVM_DEBUG(DBGS() << "Start decomposeIntoFinerGrainedOps: " << op << "\n");
// 2. Iteratively extract the RHS subexpressions while the top-level binary
// expr kind remains the same.
MLIRContext *ctx = op->getContext();
SmallVector<AffineExpr> subExpressions;
while (true) {
auto currentBinExpr = remainingExp.dyn_cast<AffineBinaryOpExpr>();
if (!currentBinExpr || currentBinExpr.getKind() != binExpr.getKind()) {
subExpressions.push_back(remainingExp);
LLVM_DEBUG(DBGS() << "--terminal: " << subExpressions.back() << "\n");
break;
}
subExpressions.push_back(currentBinExpr.getRHS());
LLVM_DEBUG(DBGS() << "--subExpr: " << subExpressions.back() << "\n");
remainingExp = currentBinExpr.getLHS();
}
// 3. Reorder subExpressions by the min symbol they are a function of.
// This also takes care of properly reordering local variables.
// This however won't be able to split expression that cannot be reassociated
// such as ones that involve divs and multiple symbols.
auto getMaxSymbol = [&](AffineExpr e) -> int64_t {
for (int64_t i = m.getNumSymbols(); i >= 0; --i)
if (e.isFunctionOfSymbol(i))
return i;
return -1;
};
std::sort(subExpressions.begin(), subExpressions.end(),
[&](AffineExpr e1, AffineExpr e2) {
return getMaxSymbol(e1) < getMaxSymbol(e2);
});
LLVM_DEBUG(
llvm::interleaveComma(subExpressions, DBGS() << "--sorted subexprs: ");
llvm::dbgs() << "\n");
// 4. Merge sorted subExpressions iteratively, thus achieving reassociation.
auto s0 = getAffineSymbolExpr(0, ctx);
auto s1 = getAffineSymbolExpr(1, ctx);
AffineMap binMap = AffineMap::get(
/*dimCount=*/0, /*symbolCount=*/2,
getAffineBinaryOpExpr(binExpr.getKind(), s0, s1), ctx);
auto current = createSubApply(rewriter, op, subExpressions[0]);
for (int64_t i = 1, e = subExpressions.size(); i < e; ++i) {
Value tmp = createSubApply(rewriter, op, subExpressions[i]);
current = rewriter.create<AffineApplyOp>(op.getLoc(), binMap,
ValueRange{current, tmp});
LLVM_DEBUG(DBGS() << "--reassociate into: " << current << "\n");
}
// 5. Replace original op.
rewriter.replaceOp(op, current.getResult());
return current;
}

156
mlir/test/Dialect/Affine/decompose-affine-ops.mlir Normal file
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@ -0,0 +1,156 @@
// RUN: mlir-opt %s -allow-unregistered-dialect -test-decompose-affine-ops -split-input-file -loop-invariant-code-motion -cse | FileCheck %s
// CHECK-DAG: #[[$c42:.*]] = affine_map<() -> (42)>
// CHECK-DAG: #[[$div32mod4:.*]] = affine_map<()[s0] -> ((s0 floordiv 32) mod 4)>
// CHECK-DAG: #[[$add:.*]] = affine_map<()[s0, s1] -> (s0 + s1)>
// CHECK-LABEL: func.func @simple_test_1
// CHECK-SAME: %[[I0:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[I1:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[I2:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[LB:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[UB:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[STEP:[0-9a-zA-Z]+]]: index
func.func @simple_test_1(%0: index, %1: index, %2: index, %lb: index, %ub: index, %step: index) {
// CHECK: %[[c42:.*]] = affine.apply #[[$c42]]()
// CHECK: %[[R1:.*]] = affine.apply #[[$div32mod4]]()[%[[I1]]]
// CHECK: %[[a:.*]] = affine.apply #[[$add]]()[%[[c42]], %[[R1]]]
%a = affine.apply affine_map<(d0) -> ((d0 floordiv 32) mod 4 + 42)>(%1)
// CHECK: "some_side_effecting_consumer"(%[[a]]) : (index) -> ()
"some_side_effecting_consumer"(%a) : (index) -> ()
return
}
// -----
// CHECK-DAG: #[[$c42:.*]] = affine_map<() -> (42)>
// CHECK-DAG: #[[$id:.*]] = affine_map<()[s0] -> (s0)>
// CHECK-DAG: #[[$add:.*]] = affine_map<()[s0, s1] -> (s0 + s1)>
// CHECK-DAG: #[[$div32div4timesm4:.*]] = affine_map<()[s0] -> (((s0 floordiv 32) floordiv 4) * -4)>
// CHECK-DAG: #[[$div32:.*]] = affine_map<()[s0] -> (s0 floordiv 32)>
// CHECK-LABEL: func.func @simple_test_2
// CHECK-SAME: %[[I0:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[I1:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[I2:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[LB:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[UB:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[STEP:[0-9a-zA-Z]+]]: index
func.func @simple_test_2(%0: index, %1: index, %2: index, %lb: index, %ub: index, %step: index) {
// CHECK: %[[c42:.*]] = affine.apply #[[$c42]]()
// CHECK: scf.for %[[i:.*]] =
scf.for %i = %lb to %ub step %step {
// CHECK: %[[R1:.*]] = affine.apply #[[$id]]()[%[[i]]]
// CHECK: %[[R2:.*]] = affine.apply #[[$add]]()[%[[c42]], %[[R1]]]
// CHECK: scf.for %[[j:.*]] =
scf.for %j = %lb to %ub step %step {
// CHECK: %[[R3:.*]] = affine.apply #[[$div32div4timesm4]]()[%[[j]]]
// CHECK: %[[R4:.*]] = affine.apply #[[$add]]()[%[[R2]], %[[R3]]]
// CHECK: %[[R5:.*]] = affine.apply #[[$div32]]()[%[[j]]]
// CHECK: %[[a:.*]] = affine.apply #[[$add]]()[%[[R4]], %[[R5]]]
%a = affine.apply affine_map<(d0)[s0] -> ((d0 floordiv 32) mod 4 + s0 + 42)>(%j)[%i]
// CHECK: "some_side_effecting_consumer"(%[[a]]) : (index) -> ()
"some_side_effecting_consumer"(%a) : (index) -> ()
}
}
return
}
// -----
// CHECK-DAG: #[[$div4:.*]] = affine_map<()[s0] -> (s0 floordiv 4)>
// CHECK-DAG: #[[$times32:.*]] = affine_map<()[s0] -> (s0 * 32)>
// CHECK-DAG: #[[$times16:.*]] = affine_map<()[s0] -> (s0 * 16)>
// CHECK-DAG: #[[$add:.*]] = affine_map<()[s0, s1] -> (s0 + s1)>
// CHECK-DAG: #[[$div4timesm32:.*]] = affine_map<()[s0] -> ((s0 floordiv 4) * -32)>
// CHECK-DAG: #[[$times8:.*]] = affine_map<()[s0] -> (s0 * 8)>
// CHECK-DAG: #[[$id:.*]] = affine_map<()[s0] -> (s0)>
// CHECK-DAG: #[[$div32div4timesm4:.*]] = affine_map<()[s0] -> (((s0 floordiv 32) floordiv 4) * -4)>
// CHECK-DAG: #[[$div32:.*]] = affine_map<()[s0] -> (s0 floordiv 32)>
// CHECK-LABEL: func.func @larger_test
// CHECK-SAME: %[[I0:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[I1:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[I2:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[LB:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[UB:[0-9a-zA-Z]+]]: index,
// CHECK-SAME: %[[STEP:[0-9a-zA-Z]+]]: index
func.func @larger_test(%0: index, %1: index, %2: index, %lb: index, %ub: index, %step: index) {
%c2 = arith.constant 2 : index
%c6 = arith.constant 6 : index
// CHECK: %[[R0:.*]] = affine.apply #[[$div4]]()[%[[I0]]]
// CHECK-NEXT: %[[R1:.*]] = affine.apply #[[$times16]]()[%[[I1]]]
// CHECK-NEXT: %[[R2:.*]] = affine.apply #[[$add]]()[%[[R0]], %[[R1]]]
// CHECK-NEXT: %[[R3:.*]] = affine.apply #[[$times32]]()[%[[I2]]]
// I1 * 16 + I2 * 32 + I0 floordiv 4
// CHECK-NEXT: %[[b:.*]] = affine.apply #[[$add]]()[%[[R2]], %[[R3]]]
// (I0 floordiv 4) * 32
// CHECK-NEXT: %[[R5:.*]] = affine.apply #[[$div4timesm32]]()[%[[I0]]]
// 8 * I0
// CHECK-NEXT: %[[R6:.*]] = affine.apply #[[$times8]]()[%[[I0]]]
// 8 * I0 + (I0 floordiv 4) * 32
// CHECK-NEXT: %[[c:.*]] = affine.apply #[[$add]]()[%[[R5]], %[[R6]]]
// CHECK-NEXT: scf.for %[[i:.*]] =
scf.for %i = %lb to %ub step %step {
// remainder from %a not hoisted above %i.
// CHECK-NEXT: %[[R8:.*]] = affine.apply #[[$times32]]()[%[[i]]]
// CHECK-NEXT: %[[a:.*]] = affine.apply #[[$add]]()[%[[b]], %[[R8]]]
// CHECK-NEXT: scf.for %[[j:.*]] =
scf.for %j = %lb to %ub step %step {
// Gets hoisted partially to i and rest outermost.
// The hoisted part is %b.
%a = affine.apply affine_map<()[s0, s1, s2, s3] -> (s1 * 16 + s2 * 32 + s3 * 32 + s0 floordiv 4)>()[%0, %1, %2, %i]
// Gets completely hoisted
%b = affine.apply affine_map<()[s0, s1, s2] -> (s1 * 16 + s2 * 32 + s0 floordiv 4)>()[%0, %1, %2]
// Gets completely hoisted
%c = affine.apply affine_map<()[s0] -> (s0 * 8 - (s0 floordiv 4) * 32)>()[%0]
// 32 * %j + %c remains here, the rest is hoisted.
// CHECK-DAG: %[[R10:.*]] = affine.apply #[[$times32]]()[%[[j]]]
// CHECK-DAG: %[[d:.*]] = affine.apply #[[$add]]()[%[[c]], %[[R10]]]
%d = affine.apply affine_map<()[s0, s1] -> (s0 * 8 + s1 * 32 - (s0 floordiv 4) * 32)>()[%0, %j]
// CHECK-DAG: %[[idj:.*]] = affine.apply #[[$id]]()[%[[j]]]
// CHECK-NEXT: scf.for %[[k:.*]] =
scf.for %k = %lb to %ub step %step {
// CHECK-NEXT: %[[idk:.*]] = affine.apply #[[$id]]()[%[[k]]]
// CHECK-NEXT: %[[e:.*]] = affine.apply #[[$add]]()[%[[c]], %[[idk]]]
%e = affine.apply affine_map<()[s0, s1] -> (s0 + s1 * 8 - (s1 floordiv 4) * 32)>()[%k, %0]
// CHECK-NEXT: %[[R15:.*]] = affine.apply #[[$div32div4timesm4]]()[%[[k]]]
// CHECK-NEXT: %[[R16:.*]] = affine.apply #[[$add]]()[%[[idj]], %[[R15]]]
// CHECK-NEXT: %[[R17:.*]] = affine.apply #[[$div32]]()[%[[k]]]
// CHECK-NEXT: %[[f:.*]] = affine.apply #[[$add]]()[%[[R16]], %[[R17]]]
%f = affine.apply affine_map<(d0)[s0] -> ((d0 floordiv 32) mod 4 + s0)>(%k)[%j]
// CHECK-NEXT: %[[g:.*]] = affine.apply #[[$add]]()[%[[b]], %[[idk]]]
%g = affine.apply affine_map<()[s0, s1, s2, s3] -> (s0 + s2 * 16 + s3 * 32 + s1 floordiv 4)>()[%k, %0, %1, %2]
// CHECK-NEXT: "some_side_effecting_consumer"(%[[a]]) : (index) -> ()
"some_side_effecting_consumer"(%a) : (index) -> ()
// CHECK-NEXT: "some_side_effecting_consumer"(%[[b]]) : (index) -> ()
"some_side_effecting_consumer"(%b) : (index) -> ()
// CHECK-NEXT: "some_side_effecting_consumer"(%[[c]]) : (index) -> ()
"some_side_effecting_consumer"(%c) : (index) -> ()
// CHECK-NEXT: "some_side_effecting_consumer"(%[[d]]) : (index) -> ()
"some_side_effecting_consumer"(%d) : (index) -> ()
// CHECK-NEXT: "some_side_effecting_consumer"(%[[e]]) : (index) -> ()
"some_side_effecting_consumer"(%e) : (index) -> ()
// CHECK-NEXT: "some_side_effecting_consumer"(%[[f]]) : (index) -> ()
"some_side_effecting_consumer"(%f) : (index) -> ()
// CHECK-NEXT: "some_side_effecting_consumer"(%[[g]]) : (index) -> ()
"some_side_effecting_consumer"(%g) : (index) -> ()
}
}
}
return
}

1
mlir/test/lib/Dialect/Affine/CMakeLists.txt
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@ -3,6 +3,7 @@ add_mlir_library(MLIRAffineTransformsTestPasses
TestAffineDataCopy.cpp
TestAffineLoopUnswitching.cpp
TestAffineLoopParametricTiling.cpp
TestDecomposeAffineOps.cpp
TestLoopFusion.cpp
TestLoopMapping.cpp
TestLoopPermutation.cpp

57
mlir/test/lib/Dialect/Affine/TestDecomposeAffineOps.cpp Normal file
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@ -0,0 +1,57 @@
//===- TestDecomposeAffineOps.cpp - Test affine ops decomposition utility -===//
//
// 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 test affine data copy utility functions and
// options.
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Affine/Transforms/Transforms.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/Passes.h"
#define PASS_NAME "test-decompose-affine-ops"
using namespace mlir;
namespace {
struct TestDecomposeAffineOps
: public PassWrapper<TestDecomposeAffineOps, OperationPass<func::FuncOp>> {
MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestDecomposeAffineOps)
StringRef getArgument() const final { return PASS_NAME; }
StringRef getDescription() const final {
return "Tests affine ops decomposition utility functions.";
}
TestDecomposeAffineOps() = default;
TestDecomposeAffineOps(const TestDecomposeAffineOps &pass)
: PassWrapper(pass){};
void runOnOperation() override;
};
} // namespace
void TestDecomposeAffineOps::runOnOperation() {
IRRewriter rewriter(&getContext());
this->getOperation().walk([&](AffineApplyOp op) {
rewriter.setInsertionPoint(op);
reorderOperandsByHoistability(rewriter, op);
(void)decompose(rewriter, op);
});
}
namespace mlir {
void registerTestDecomposeAffineOpPass() {
PassRegistration<TestDecomposeAffineOps>();
}
} // namespace mlir

2
mlir/tools/mlir-opt/mlir-opt.cpp
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@ -40,6 +40,7 @@ void registerSliceAnalysisTestPass();
void registerSymbolTestPasses();
void registerRegionTestPasses();
void registerTestAffineDataCopyPass();
void registerTestDecomposeAffineOpPass();
void registerTestAffineLoopUnswitchingPass();
void registerTestAllReduceLoweringPass();
void registerTestFunc();
@ -148,6 +149,7 @@ void registerTestPasses() {
registerSymbolTestPasses();
registerRegionTestPasses();
registerTestAffineDataCopyPass();
registerTestDecomposeAffineOpPass();
registerTestAffineLoopUnswitchingPass();
registerTestAllReduceLoweringPass();
registerTestFunc();