File instr_jalr.h

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#pragma once

#include <cstdint>
#include <vector>

#include "sm/instr.h"
#include "sm/thread.h"
#include "sm/warp.h"

namespace simtix {

class InstrJalr : public Instr {
 public:
  using Op = void (InstrJalr::*)();

  // Implementation of Instr's virtual methods
  void Decode() override;

  void Issue() override;

  void OperandCollect() override;

  void Execute() override;

  void Commit() override;

  void Reset() override;

  void Assign(const Instr *other) override;

  bool CanIssue() const override;

  bool CanExecute() const override { return rs1_data_ready_; }

  bool CanCommit() const override { return executed_; }

  bool CanRetire() const override { return committed_; }

  bool may_change_ctrl_flow() const override { return true; }

  // Helper functionos
  static inline int64_t DecodeImmItype(uint32_t iword) {
    return (int32_t(iword) >> 20);
  }

 protected:
  InstrJalr(Warp *warp, uint32_t iword, uint64_t wpc);

  void Reinitialize(Warp *warp, uint32_t iword, uint64_t wpc) override;

  int64_t imm_ = 0;

  Op op_ = nullptr;

  bool rs1_data_ready_ = false;
  bool executed_ = false;
  bool committed_ = false;

  // Register data
  std::vector<int64_t> rs1_data_;
  int64_t rd_data_;

  std::vector<uint64_t> next_pc_;

 private:
  // Operands defined in this Opcode
  void jalr_() {
    rd_data_ = wpc_ + 4;
    for (Thread *t : active_threads_) {
      uint32_t tid = t->tid();
      next_pc_[tid] = rs1_data_[tid] + imm_;
    }
  }

  void nop_() {}

  template <class InstrType>
  friend class InstrPool;
};
}  // namespace simtix