Function test_ordered_unordered_cmp

tests/fuzz.cpp:815–855

Strategy 11: Ordered vs Unordered Comparisons * * Tests comieq/ucomieq differences in NaN handling and flag setting. */

 * Tests comieq/ucomieq differences in NaN handling and flag setting.
 */
static void test_ordered_unordered_cmp(const uint8_t *data, size_t size)
{
    if (size < 16)
        return;

    __m128 a = _mm_loadu_ps((const float *) data);
    __m128 b = _mm_loadu_ps((const float *) (data + (size >= 32 ? 16 : 0)));
    __m128d da = _mm_loadu_pd((const double *) data);
    __m128d db = _mm_loadu_pd((const double *) (data + (size >= 32 ? 16 : 0)));

    __m128 nan_ps = _mm_set1_ps(__builtin_nanf(""));
    __m128d nan_pd = _mm_set1_pd(__builtin_nan(""));

    /* Ordered comparisons (signal on QNaN) */
    SINK_I32(_mm_comieq_ss(a, b));
    SINK_I32(_mm_comilt_ss(a, b));
    SINK_I32(_mm_comile_ss(a, b));
    SINK_I32(_mm_comigt_ss(a, b));
    SINK_I32(_mm_comige_ss(a, b));
    SINK_I32(_mm_comineq_ss(a, b));

    /* Unordered comparisons (quiet on QNaN) */
    SINK_I32(_mm_ucomieq_ss(a, b));
    SINK_I32(_mm_ucomilt_ss(a, b));
    SINK_I32(_mm_ucomile_ss(a, b));
    SINK_I32(_mm_ucomigt_ss(a, b));
    SINK_I32(_mm_ucomige_ss(a, b));
    SINK_I32(_mm_ucomineq_ss(a, b));

    /* Compare with NaN */
    SINK_I32(_mm_comieq_ss(a, nan_ps));
    SINK_I32(_mm_ucomieq_ss(a, nan_ps));
    SINK_I32(_mm_comilt_ss(nan_ps, a));
    SINK_I32(_mm_ucomilt_ss(nan_ps, a));

    /* Double precision */
    SINK_I32(_mm_comieq_sd(da, db));
    SINK_I32(_mm_ucomieq_sd(da, db));
    SINK_I32(_mm_comieq_sd(da, nan_pd));
    SINK_I32(_mm_ucomieq_sd(da, nan_pd));
}

/* Strategy 12: Dot Product Operations
 *