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//==- AArch64PBQPRegAlloc.h - AArch64 specific PBQP constraints --*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H
#define LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H
#include "llvm/ADT/SetVector.h"
#include "llvm/CodeGen/PBQPRAConstraint.h"
namespace llvm {
class TargetRegisterInfo;
/// Add the accumulator chaining constraint to a PBQP graph
class A57ChainingConstraint : public PBQPRAConstraint {
public:
// Add A57 specific constraints to the PBQP graph.
void apply(PBQPRAGraph &G) override;
private:
SmallSetVector<unsigned, 32> Chains;
const TargetRegisterInfo *TRI;
// Add the accumulator chaining constraint, inside the chain, i.e. so that
// parity(Rd) == parity(Ra).
// \return true if a constraint was added
bool addIntraChainConstraint(PBQPRAGraph &G, unsigned Rd, unsigned Ra);
// Add constraints between existing chains
void addInterChainConstraint(PBQPRAGraph &G, unsigned Rd, unsigned Ra);
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H
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