/*========================== begin_copyright_notice ============================

Copyright (C) 2021 Intel Corporation

SPDX-License-Identifier: MIT

============================= end_copyright_notice ===========================*/

/**
 * @file getCacheOpts.h
 *
 * @section DESCRIPTION
 *
 * This file contains declarations of utility functions which return the cache options
 * for a given load or store instruction.
 */
#pragma once

#include "visa_igc_common_header.h"                      // for LSC_L1_L3_CC

#include "common/LLVMWarningsPush.hpp"                   // for suppressing LLVM warnings
#include <optional>                                      // for Optional
#include "llvm/IR/Instructions.h"                        // for llvm::StoreInst, llvm::LoadInst
#include "common/LLVMWarningsPop.hpp"                    // for suppressing LLVM warnings

#include "Compiler/CodeGenPublic.h"

namespace IGC {
    /**
     * @param Ptr        Pointer to memory
     * @param Ctx        Context
     *
     * @return  Optional containing the cache options for that particular store instruction
     *          if the RTRegion is RTAsynctack, SWStack, SWHotZone, RTSynctack
     *          or empty Optional if the RTRegion cannot be known, or if it is a RTGlobals or LocalArgs
     */
    std::optional<LSC_L1_L3_CC> getCacheOptsStorePolicy(
        const llvm::Value* Ptr,
        const CodeGenContext &Ctx);

    /**
     * @param storeInst  LLVM IR store instruction
     * @param Ctx        Context
     *
     * @return  Optional containing the cache options for that particular store instruction
     *          if the RTRegion is RTAsynctack, SWStack, SWHotZone, RTSynctack
     *          or empty Optional if the RTRegion cannot be known, or if it is a RTGlobals or LocalArgs
     */
    std::optional<LSC_L1_L3_CC> getCacheOptsStorePolicy(
        const llvm::StoreInst& storeInst,
        const CodeGenContext &Ctx);

    /**
     * @param Ptr       Pointer to memory
     * @param Ctx        Context
     *
     * @return  Optional containing the cache options for that particular load instruction
     *          if the RTRegion is RTAsynctack, SWStack, SWHotZone, RTSynctack
     *          or empty Optional if the RTRegion cannot be known, or if it is a RTGlobals or LocalArgs
     */
    std::optional<LSC_L1_L3_CC> getCacheOptsLoadPolicy(
        const llvm::Value* Ptr,
        const CodeGenContext &Ctx);

    /**
     * @param loadInst  LLVM IR load instruction
     * @param Ctx        Context
     *
     * @return  Optional containing the cache options for that particular load instruction
     *          if the RTRegion is RTAsynctack, SWStack, SWHotZone, RTSynctack
     *          or empty Optional if the RTRegion cannot be known, or if it is a RTGlobals or LocalArgs
     */
    std::optional<LSC_L1_L3_CC> getCacheOptsLoadPolicy(
        const llvm::LoadInst& loadInst,
        const CodeGenContext &Ctx);

    /**
     * @return the store cache policy for the RTStack
     */
    LSC_L1_L3_CC RTStackStorePolicy();

    /**
     * @return the store cache policy for the SWHotZone
     */
    LSC_L1_L3_CC SWHotZoneStorePolicy();

    /**
     * @return the store cache policy for the SWStack
     */
    LSC_L1_L3_CC SWStackStorePolicy(const CodeGenContext &Ctx);

    /**
     * @return the load cache policy for the RTStack
     */
    LSC_L1_L3_CC RTStackLoadPolicy();

    /**
     * @return the load cache policy for the SWHotZone
     */
    LSC_L1_L3_CC SWHotZoneLoadPolicy();

    /**
     * @return the load cache policy for the SWStack
     */
    LSC_L1_L3_CC SWStackLoadPolicy(const CodeGenContext& Ctx);
} // namespace IGC

