CLTunerTypes.h

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 * Copyright (c) 2019-2021 Arm Limited.
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#ifndef ARM_COMPUTE_CLTUNER_TYPES_H
#define ARM_COMPUTE_CLTUNER_TYPES_H

#include "arm_compute/core/Error.h"
#include "arm_compute/core/utils/misc/Utility.h"

#include <map>

namespace arm_compute
{
/**< OpenCL tuner modes */
enum class CLTunerMode
{
    EXHAUSTIVE, /**< Searches all possible LWS configurations while tuning */
    NORMAL,     /**< Searches a subset of LWS configurations while tuning */
    RAPID       /**< Searches a minimal subset of LWS configurations while tuning */
};

/**< OpenCL tuner tuning information */
struct CLTuningInfo
{
    CLTunerMode tuner_mode = CLTunerMode::NORMAL; /**< Parameter to select the level (granularity) of the tuning */
    bool        tune_wbsm  = false;               /**< Flag to tune the batches of work groups distributed to compute units.
                                                       Internally, the library will check if this feature is available on
                                                       the target platform. This OpenCL tuner extension is still in experimental phase */
};

/** Converts a string to a strong types enumeration @ref CLTunerMode
 *
 * @param[in] name String to convert
 *
 * @return Converted CLTunerMode enumeration
 */
inline CLTunerMode tuner_mode_from_name(const std::string &name)
{
    static const std::map<std::string, CLTunerMode> tuner_modes =
    {
        { "exhaustive", CLTunerMode::EXHAUSTIVE },
        { "normal", CLTunerMode::NORMAL },
        { "rapid", CLTunerMode::RAPID },
    };

#ifndef ARM_COMPUTE_EXCEPTIONS_DISABLED
    try
    {
#endif /* ARM_COMPUTE_EXCEPTIONS_DISABLED */
        return tuner_modes.at(arm_compute::utility::tolower(name));

#ifndef ARM_COMPUTE_EXCEPTIONS_DISABLED
    }
    catch(const std::out_of_range &)
    {
        throw std::invalid_argument(name);
    }
#endif /* ARM_COMPUTE_EXCEPTIONS_DISABLED */
}

/** Input Stream operator for @ref CLTunerMode
 *
 * @param[in]  stream     Stream to parse
 * @param[out] tuner_mode Output tuner mode
 *
 * @return Updated stream
 */
inline ::std::istream &operator>>(::std::istream &stream, CLTunerMode &tuner_mode)
{
    std::string value;
    stream >> value;
    tuner_mode = tuner_mode_from_name(value);
    return stream;
}
} // namespace arm_compute
#endif /*ARM_COMPUTE_CLTUNER_TYPES_H */