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//===- ValueBoundsOpInterfaceImpl.cpp - Impl. of ValueBoundsOpInterface ---===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/Arith/IR/ValueBoundsOpInterfaceImpl.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Interfaces/ValueBoundsOpInterface.h"
using namespace mlir;
namespace mlir {
namespace arith {
namespace {
struct AddIOpInterface
: public ValueBoundsOpInterface::ExternalModel<AddIOpInterface, AddIOp> {
void populateBoundsForIndexValue(Operation *op, Value value,
ValueBoundsConstraintSet &cstr) const {
auto addIOp = cast<AddIOp>(op);
assert(value == addIOp.getResult() && "invalid value");
// Note: `getExpr` has a side effect: it may add a new column to the
// constraint system. The evaluation order of addition operands is
// unspecified in C++. To make sure that all compilers produce the exact
// same results (that can be FileCheck'd), it is important that `getExpr`
// is called first and assigned to temporary variables, and the addition
// is performed afterwards.
AffineExpr lhs = cstr.getExpr(addIOp.getLhs());
AffineExpr rhs = cstr.getExpr(addIOp.getRhs());
cstr.bound(value) == lhs + rhs;
}
};
struct ConstantOpInterface
: public ValueBoundsOpInterface::ExternalModel<ConstantOpInterface,
ConstantOp> {
void populateBoundsForIndexValue(Operation *op, Value value,
ValueBoundsConstraintSet &cstr) const {
auto constantOp = cast<ConstantOp>(op);
assert(value == constantOp.getResult() && "invalid value");
if (auto attr = llvm::dyn_cast<IntegerAttr>(constantOp.getValue()))
cstr.bound(value) == attr.getInt();
}
};
struct SubIOpInterface
: public ValueBoundsOpInterface::ExternalModel<SubIOpInterface, SubIOp> {
void populateBoundsForIndexValue(Operation *op, Value value,
ValueBoundsConstraintSet &cstr) const {
auto subIOp = cast<SubIOp>(op);
assert(value == subIOp.getResult() && "invalid value");
AffineExpr lhs = cstr.getExpr(subIOp.getLhs());
AffineExpr rhs = cstr.getExpr(subIOp.getRhs());
cstr.bound(value) == lhs - rhs;
}
};
struct MulIOpInterface
: public ValueBoundsOpInterface::ExternalModel<MulIOpInterface, MulIOp> {
void populateBoundsForIndexValue(Operation *op, Value value,
ValueBoundsConstraintSet &cstr) const {
auto mulIOp = cast<MulIOp>(op);
assert(value == mulIOp.getResult() && "invalid value");
AffineExpr lhs = cstr.getExpr(mulIOp.getLhs());
AffineExpr rhs = cstr.getExpr(mulIOp.getRhs());
cstr.bound(value) == lhs *rhs;
}
};
struct SelectOpInterface
: public ValueBoundsOpInterface::ExternalModel<SelectOpInterface,
SelectOp> {
static void populateBounds(SelectOp selectOp, std::optional<int64_t> dim,
ValueBoundsConstraintSet &cstr) {
Value value = selectOp.getResult();
Value condition = selectOp.getCondition();
Value trueValue = selectOp.getTrueValue();
Value falseValue = selectOp.getFalseValue();
if (isa<ShapedType>(condition.getType())) {
// If the condition is a shaped type, the condition is applied
// element-wise. All three operands must have the same shape.
cstr.bound(value)[*dim] == cstr.getExpr(trueValue, dim);
cstr.bound(value)[*dim] == cstr.getExpr(falseValue, dim);
cstr.bound(value)[*dim] == cstr.getExpr(condition, dim);
return;
}
// Populate constraints for the true/false values (and all values on the
// backward slice, as long as the current stop condition is not satisfied).
cstr.populateConstraints(trueValue, dim);
cstr.populateConstraints(falseValue, dim);
auto boundsBuilder = cstr.bound(value);
if (dim)
boundsBuilder[*dim];
// Compare yielded values.
// If trueValue <= falseValue:
// * result <= falseValue
// * result >= trueValue
if (cstr.compare(/*lhs=*/{trueValue, dim},
ValueBoundsConstraintSet::ComparisonOperator::LE,
/*rhs=*/{falseValue, dim})) {
if (dim) {
cstr.bound(value)[*dim] >= cstr.getExpr(trueValue, dim);
cstr.bound(value)[*dim] <= cstr.getExpr(falseValue, dim);
} else {
cstr.bound(value) >= trueValue;
cstr.bound(value) <= falseValue;
}
}
// If falseValue <= trueValue:
// * result <= trueValue
// * result >= falseValue
if (cstr.compare(/*lhs=*/{falseValue, dim},
ValueBoundsConstraintSet::ComparisonOperator::LE,
/*rhs=*/{trueValue, dim})) {
if (dim) {
cstr.bound(value)[*dim] >= cstr.getExpr(falseValue, dim);
cstr.bound(value)[*dim] <= cstr.getExpr(trueValue, dim);
} else {
cstr.bound(value) >= falseValue;
cstr.bound(value) <= trueValue;
}
}
}
void populateBoundsForIndexValue(Operation *op, Value value,
ValueBoundsConstraintSet &cstr) const {
populateBounds(cast<SelectOp>(op), /*dim=*/std::nullopt, cstr);
}
void populateBoundsForShapedValueDim(Operation *op, Value value, int64_t dim,
ValueBoundsConstraintSet &cstr) const {
populateBounds(cast<SelectOp>(op), dim, cstr);
}
};
} // namespace
} // namespace arith
} // namespace mlir
void mlir::arith::registerValueBoundsOpInterfaceExternalModels(
DialectRegistry ®istry) {
registry.addExtension(+[](MLIRContext *ctx, arith::ArithDialect *dialect) {
arith::AddIOp::attachInterface<arith::AddIOpInterface>(*ctx);
arith::ConstantOp::attachInterface<arith::ConstantOpInterface>(*ctx);
arith::SubIOp::attachInterface<arith::SubIOpInterface>(*ctx);
arith::MulIOp::attachInterface<arith::MulIOpInterface>(*ctx);
arith::SelectOp::attachInterface<arith::SelectOpInterface>(*ctx);
});
}
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