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       1             : //==- AArch64PBQPRegAlloc.h - AArch64 specific PBQP constraints --*- C++ -*-==//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : 
      10             : #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H
      11             : #define LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H
      12             : 
      13             : #include "llvm/ADT/SetVector.h"
      14             : #include "llvm/CodeGen/PBQPRAConstraint.h"
      15             : 
      16             : namespace llvm {
      17             : 
      18             : class TargetRegisterInfo;
      19             : 
      20             : /// Add the accumulator chaining constraint to a PBQP graph
      21           5 : class A57ChainingConstraint : public PBQPRAConstraint {
      22             : public:
      23             :   // Add A57 specific constraints to the PBQP graph.
      24             :   void apply(PBQPRAGraph &G) override;
      25             : 
      26             : private:
      27             :   SmallSetVector<unsigned, 32> Chains;
      28             :   const TargetRegisterInfo *TRI;
      29             : 
      30             :   // Add the accumulator chaining constraint, inside the chain, i.e. so that
      31             :   // parity(Rd) == parity(Ra).
      32             :   // \return true if a constraint was added
      33             :   bool addIntraChainConstraint(PBQPRAGraph &G, unsigned Rd, unsigned Ra);
      34             : 
      35             :   // Add constraints between existing chains
      36             :   void addInterChainConstraint(PBQPRAGraph &G, unsigned Rd, unsigned Ra);
      37             : };
      38             : 
      39             : } // end namespace llvm
      40             : 
      41             : #endif // LLVM_LIB_TARGET_AARCH64_AARCH64PBQPREGALOC_H