Re: [FFmpeg-devel] [PATCHv2 1/1] checkasm/lpc: test compute_autocorr

[James Almer <jamrial@gmail.com>]

On 12/17/2023 6:13 AM, Rémi Denis-Courmont wrote:
> ---
>   tests/checkasm/lpc.c | 47 ++++++++++++++++++++++++++++++++++++++++++--
>   1 file changed, 45 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/checkasm/lpc.c b/tests/checkasm/lpc.c
> index 592e34c03d..9b33f8a3b0 100644
> --- a/tests/checkasm/lpc.c
> +++ b/tests/checkasm/lpc.c
> @@ -57,10 +57,46 @@ static void test_window(int len)
>       bench_new(src, len, dst1);
>   }
>   
> +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++) {
> +        if (!double_near_abs_eps(dst0[i], dst1[i], EPS)) {

checkasm: using random seed 2504816888
SSE2:
  - lpc.apply_welch_window_even [OK]
  - lpc.apply_welch_window_odd  [OK]
0:  770.224646270451 -  770.382378714191 = -0.15773244374
    autocorr_10_sse2 (lpc.c:86)
  - lpc.compute_autocorr_10     [FAILED]
0:  807.574416481743 -  807.732148925482 = -0.157732443739
    autocorr_30_sse2 (lpc.c:86)
  - lpc.compute_autocorr_30     [FAILED]
0:  787.329053288888 -  787.486785732628 = -0.15773244374
    autocorr_32_sse2 (lpc.c:86)
  - lpc.compute_autocorr_32     [FAILED]

checkasm: using random seed 827008587
SSE2:
  - lpc.apply_welch_window_even [OK]
  - lpc.apply_welch_window_odd  [OK]
  - lpc.compute_autocorr_10     [OK]
  - lpc.compute_autocorr_30     [OK]
  - lpc.compute_autocorr_32     [OK]

Some seeds work, others don't. So i guess EPS is too small.

> +            fprintf(stderr, "%zu: %- .12f - %- .12f = % .12g\n",
> +                    i, dst0[i], dst1[i], dst0[i] - dst1[i]);
> +            fail();
> +            break;
> +        }
> +    }
> +
> +    bench_new(src, len, lag, dst1);
> +}
> +
>   void checkasm_check_lpc(void)
>   {
>       LPCContext ctx;
> -    int len = rnd() % 5000;
> +    int len = 2000 + (rnd() % 3000);
> +    static const int lags[] = { 10, 30, 32 };
> +
>       ff_lpc_init(&ctx, 32, 16, FF_LPC_TYPE_DEFAULT);
>   
>       if (check_func(ctx.lpc_apply_welch_window, "apply_welch_window_even")) {
> @@ -72,6 +108,13 @@ void checkasm_check_lpc(void)
>           test_window(len | 1);
>       }
>       report("apply_welch_window_odd");
> -
>       ff_lpc_end(&ctx);
> +
> +    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);
> +    }
>   }
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