[FFmpeg-devel] [PATCH] checkasm/lpc: test compute_autocorr

[Rémi Denis-Courmont]

Le lauantaina 25. toukokuuta 2024, 14.58.53 EEST Rémi Denis-Courmont a écrit :
> --
> Change since previous version:
> - Disable test on x86, since the x86 optimisation fails
>   with a suspiciously large and regular error with 10-20% probability.
> ---
>  tests/checkasm/lpc.c | 54 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 52 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/checkasm/lpc.c b/tests/checkasm/lpc.c
> index 592e34c03d..38810325ac 100644
> --- a/tests/checkasm/lpc.c
> +++ b/tests/checkasm/lpc.c
> @@ -16,6 +16,7 @@
>   * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
>   */
> 
> +#include "libavutil/avassert.h"
>  #include "libavutil/mem_internal.h"
> 
>  #include "libavcodec/lpc.h"
> @@ -57,10 +58,50 @@ static void test_window(int len)
>      bench_new(src, len, dst1);
>  }
> 
> +#if !ARCH_X86
> +static void test_compute_autocorr(ptrdiff_t len, int lag)
> +{
> +    LOCAL_ALIGNED(32, double, src, [5000 + 2 + MAX_LPC_ORDER]);
> +    LOCAL_ALIGNED(16, double, dst0, [MAX_LPC_ORDER + 1]);
> +    LOCAL_ALIGNED(16, double, dst1, [MAX_LPC_ORDER + 1]);
> +
> +    declare_func(void, const double *in, ptrdiff_t len, int lag, double
> *out); +
> +    av_assert0(lag >= 0 && lag <= MAX_LPC_ORDER);
> +
> +    for (int i = 0; i < MAX_LPC_ORDER; i++)
> +        src[i] = 0.;
> +
> +    src += MAX_LPC_ORDER;
> +
> +    for (ptrdiff_t i = 0; i < len; i++) {
> +        src[i] = (double)rnd() / (double)UINT_MAX;
> +    }
> +
> +    call_ref(src, len, lag, dst0);
> +    call_new(src, len, lag, dst1);
> +
> +    for (size_t i = 0; i < lag; i++) {

Should also check dst[lag] AFAIU.

> +        if (!double_near_abs_eps(dst0[i], dst1[i], EPS)) {
> +            fprintf(stderr, "%zu: %- .12f - %- .12f = % .12g\n",
> +                    i, dst0[i], dst1[i], dst0[i] - dst1[i]);
> +            fail();
> +            break;
> +        }
> +    }
> +
> +    bench_new(src, len, lag, dst1);
> +}
> +#endif
> +
>  void checkasm_check_lpc(void)
>  {
>      LPCContext ctx;
> -    int len = rnd() % 5000;
> +    int len = 2000 + (rnd() % 3000);
> +#if !ARCH_X86
> +    static const int lags[] = { 10, 30, 32 };
> +#endif
> +
>      ff_lpc_init(&ctx, 32, 16, FF_LPC_TYPE_DEFAULT);
> 
>      if (check_func(ctx.lpc_apply_welch_window, "apply_welch_window_even"))
> { @@ -72,6 +113,15 @@ void checkasm_check_lpc(void)
>          test_window(len | 1);
>      }
>      report("apply_welch_window_odd");
> -
>      ff_lpc_end(&ctx);
> +
> +#if !ARCH_X86
> +    for (size_t i = 0; i < FF_ARRAY_ELEMS(lags); i++) {
> +        ff_lpc_init(&ctx, len, lags[i], FF_LPC_TYPE_DEFAULT);
> +        if (check_func(ctx.lpc_compute_autocorr, "autocorr_%d", lags[i]))
> +            test_compute_autocorr(len, lags[i]);
> +        report("compute_autocorr_%d", lags[i]);
> +        ff_lpc_end(&ctx);
> +    }
> +#endif
>  }


-- 
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