hg_numerics_checker.hpp

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// Copyright 2021-2022, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief Simple util for setting floating-point exceptions and checking for NaNs.
 * @author Moses Turner <moses@collabora.com>
 * @ingroup drv_ht
 */
 
#undef PEDANTIC_NAN_CHECKS
#undef NAN_EXCEPTIONS
 
#ifdef NAN_EXCEPTIONS
#include <cfenv>
#endif
 
namespace xrt::tracking::hand::mercury::numerics_checker {
 
#ifdef PEDANTIC_NAN_CHECKS
#define CHECK_NOT_NAN(val)                                                                                             \
        do {                                                                                                           \
                if (val != val) {                                                                                      \
                        U_LOG_E(" was NAN at %d", __LINE__);                                                           \
                        assert(false);                                                                                 \
                }                                                                                                      \
                                                                                                                       \
        } while (0)
 
#else
#define CHECK_NOT_NAN(val) (void)val;
#endif
 
#ifdef NAN_EXCEPTIONS
static int ex = FE_DIVBYZERO | FE_OVERFLOW | FE_INVALID;
 
 
static inline void
set_floating_exceptions()
{
        // NO: FE_UNDERFLOW, FE_INEXACT
        // https://stackoverflow.com/questions/60731382/c-setting-floating-point-exception-environment
        feenableexcept(ex); // Uncomment this for version 2
}
 
static inline void
remove_floating_exceptions()
{
        fedisableexcept(ex);
}
 
#else
static inline void
set_floating_exceptions()
{}
 
static inline void
remove_floating_exceptions()
{}
#endif
 
 
} // namespace xrt::tracking::hand::mercury::numerics_checker