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//===- Utils.h - General transformation utilities ---------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This header file defines prototypes for various transformation utilities for
// the StandardOps dialect. These are not passes by themselves but are used
// either by passes, optimization sequences, or in turn by other transformation
// utilities.
#include "mlir/Dialect/Arithmetic/IR/Arithmetic.h"
#include "mlir/Dialect/StandardOps/IR/Ops.h"
#include "mlir/IR/Matchers.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/IR/Value.h"
namespace mlir {
/// Matches a ConstantIndexOp.
detail::op_matcher<arith::ConstantIndexOp> matchConstantIndex();
/// Detects the `values` produced by a ConstantIndexOp and places the new
/// constant in place of the corresponding sentinel value.
void canonicalizeSubViewPart(SmallVectorImpl<OpFoldResult> &values,
function_ref<bool(int64_t)> isDynamic);
void getPositionsOfShapeOne(unsigned rank, ArrayRef<int64_t> shape,
llvm::SmallDenseSet<unsigned> &dimsToProject);
/// Pattern to rewrite a subview op with constant arguments.
template <typename OpType, typename ResultTypeFunc, typename CastOpFunc>
class OpWithOffsetSizesAndStridesConstantArgumentFolder final
: public OpRewritePattern<OpType> {
using OpRewritePattern<OpType>::OpRewritePattern;
LogicalResult matchAndRewrite(OpType op,
PatternRewriter &rewriter) const override {
// No constant operand, just return;
if (llvm::none_of(op.getOperands(), [](Value operand) {
return matchPattern(operand, matchConstantIndex());
return failure();
// At least one of offsets/sizes/strides is a new constant.
// Form the new list of operands and constant attributes from the existing.
SmallVector<OpFoldResult> mixedOffsets(op.getMixedOffsets());
SmallVector<OpFoldResult> mixedSizes(op.getMixedSizes());
SmallVector<OpFoldResult> mixedStrides(op.getMixedStrides());
canonicalizeSubViewPart(mixedOffsets, ShapedType::isDynamicStrideOrOffset);
canonicalizeSubViewPart(mixedSizes, ShapedType::isDynamic);
canonicalizeSubViewPart(mixedStrides, ShapedType::isDynamicStrideOrOffset);
// Create the new op in canonical form.
ResultTypeFunc resultTypeFunc;
auto resultType =
resultTypeFunc(op, mixedOffsets, mixedSizes, mixedStrides);
auto newOp =
rewriter.create<OpType>(op.getLoc(), resultType, op.source(),
mixedOffsets, mixedSizes, mixedStrides);
CastOpFunc func;
func(rewriter, op, newOp);
return success();
/// Converts an OpFoldResult to a Value. Returns the fold result if it casts to
/// a Value or creates a ConstantIndexOp if it casts to an IntegerAttribute.
/// Other attribute types are not supported.
Value getValueOrCreateConstantIndexOp(OpBuilder &b, Location loc,
OpFoldResult ofr);
/// Similar to the other overload, but converts multiple OpFoldResults into
/// Values.
getValueOrCreateConstantIndexOp(OpBuilder &b, Location loc,
ArrayRef<OpFoldResult> valueOrAttrVec);
/// Helper struct to build simple arithmetic quantities with minimal type
/// inference support.
struct ArithBuilder {
ArithBuilder(OpBuilder &b, Location loc) : b(b), loc(loc) {}
Value _and(Value lhs, Value rhs);
Value add(Value lhs, Value rhs);
Value mul(Value lhs, Value rhs);
Value select(Value cmp, Value lhs, Value rhs);
Value sgt(Value lhs, Value rhs);
Value slt(Value lhs, Value rhs);
OpBuilder &b;
Location loc;
} // end namespace mlir