[v2,1/3] x86: Expand bench-memcmp.c and test-memcmp.c

  No bug. This commit adds some additional performance test cases to
bench-memcmp.c and test-memcmp.c. The new benchtests include some
medium range sizes, as well as small sizes near page cross. The new
correctness tests correspond with the new benchtests though add some
additional cases for checking the page cross logic.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
---
 benchtests/bench-memcmp.c | 32 +++++++++++++++++++++++++------
 string/test-memcmp.c      | 40 +++++++++++++++++++++++++++++++++------
 2 files changed, 60 insertions(+), 12 deletions(-)
  

On Tue, May 18, 2021 at 7:24 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> No bug. This commit adds some additional performance test cases to
> bench-memcmp.c and test-memcmp.c. The new benchtests include some
> medium range sizes, as well as small sizes near page cross. The new
> correctness tests correspond with the new benchtests though add some
> additional cases for checking the page cross logic.
>
> Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
> ---
>  benchtests/bench-memcmp.c | 32 +++++++++++++++++++++++++------
>  string/test-memcmp.c      | 40 +++++++++++++++++++++++++++++++++------
>  2 files changed, 60 insertions(+), 12 deletions(-)
>
> diff --git a/benchtests/bench-memcmp.c b/benchtests/bench-memcmp.c
> index eb0f94a0f1..744c7ec5ba 100644
> --- a/benchtests/bench-memcmp.c
> +++ b/benchtests/bench-memcmp.c
> @@ -88,11 +88,11 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
>    if (len == 0)
>      return;
>
> -  align1 &= 63;
> +  align1 &= (4096 - CHARBYTES);
>    if (align1 + (len + 1) * CHARBYTES >= page_size)
>      return;
>
> -  align2 &= 63;
> +  align2 &= (4096 - CHARBYTES);
>    if (align2 + (len + 1) * CHARBYTES >= page_size)
>      return;
>
> @@ -100,6 +100,7 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len,
>    json_attr_uint (json_ctx, "length", (double) len);
>    json_attr_uint (json_ctx, "align1", (double) align1);
>    json_attr_uint (json_ctx, "align2", (double) align2);
> +  json_attr_uint (json_ctx, "result", (double) exp_result);
>    json_array_begin (json_ctx, "timings");
>
>    FOR_EACH_IMPL (impl, 0)
> @@ -145,18 +146,31 @@ test_main (void)
>    json_array_end (&json_ctx);
>
>    json_array_begin (&json_ctx, "results");
> -  for (i = 1; i < 16; ++i)
> +  for (i = 1; i < 32; ++i)
>      {
>        do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, 0);
>        do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, 1);
>        do_test (&json_ctx, i * CHARBYTES, i * CHARBYTES, i, -1);
>      }
>
> -  for (i = 0; i < 16; ++i)
> +  for (i = 0; i < 32; ++i)
>      {
>        do_test (&json_ctx, 0, 0, i, 0);
>        do_test (&json_ctx, 0, 0, i, 1);
>        do_test (&json_ctx, 0, 0, i, -1);
> +      do_test (&json_ctx, 4096 - i, 0, i, 0);
> +      do_test (&json_ctx, 4096 - i, 0, i, 1);
> +      do_test (&json_ctx, 4096 - i, 0, i, -1);
> +    }
> +
> +  for (i = 33; i < 385; i += 32)
> +    {
> +      do_test (&json_ctx, 0, 0, i, 0);
> +      do_test (&json_ctx, 0, 0, i, 1);
> +      do_test (&json_ctx, 0, 0, i, -1);
> +      do_test (&json_ctx, i, 0, i, 0);
> +      do_test (&json_ctx, 0, i, i, 1);
> +      do_test (&json_ctx, i, i, i, -1);
>      }
>
>    for (i = 1; i < 10; ++i)
> @@ -164,13 +178,19 @@ test_main (void)
>        do_test (&json_ctx, 0, 0, 2 << i, 0);
>        do_test (&json_ctx, 0, 0, 2 << i, 1);
>        do_test (&json_ctx, 0, 0, 2 << i, -1);
> -      do_test (&json_ctx, 0, 0, 16 << i, 0);
>        do_test (&json_ctx, (8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
> +      do_test (&json_ctx, 0, 0, 16 << i, 0);
>        do_test (&json_ctx, 0, 0, 16 << i, 1);
>        do_test (&json_ctx, 0, 0, 16 << i, -1);
> +      do_test (&json_ctx, i, 0, 2 << i, 0);
> +      do_test (&json_ctx, 0, i, 2 << i, 1);
> +      do_test (&json_ctx, i, i, 2 << i, -1);
> +      do_test (&json_ctx, i, 0, 16 << i, 0);
> +      do_test (&json_ctx, 0, i, 16 << i, 1);
> +      do_test (&json_ctx, i, i, 16 << i, -1);
>      }
>
> -  for (i = 1; i < 8; ++i)
> +  for (i = 1; i < 10; ++i)
>      {
>        do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
>        do_test (&json_ctx, i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
> diff --git a/string/test-memcmp.c b/string/test-memcmp.c
> index 02ea9b782d..fbda26a41e 100644
> --- a/string/test-memcmp.c
> +++ b/string/test-memcmp.c
> @@ -111,11 +111,11 @@ do_test (size_t align1, size_t align2, size_t len, int exp_result)
>    if (len == 0)
>      return;
>
> -  align1 &= 63;
> +  align1 &= (4096 - CHARBYTES);
>    if (align1 + (len + 1) * CHARBYTES >= page_size)
>      return;
>
> -  align2 &= 63;
> +  align2 &= (4096 - CHARBYTES);
>    if (align2 + (len + 1) * CHARBYTES >= page_size)
>      return;
>
> @@ -487,18 +487,40 @@ test_main (void)
>      printf ("\t%s", impl->name);
>    putchar ('\n');
>
> -  for (i = 1; i < 16; ++i)
> +  for (i = 1; i < 32; ++i)
>      {
>        do_test (i * CHARBYTES, i * CHARBYTES, i, 0);
>        do_test (i * CHARBYTES, i * CHARBYTES, i, 1);
>        do_test (i * CHARBYTES, i * CHARBYTES, i, -1);
>      }
>
> -  for (i = 0; i < 16; ++i)
> +  for (i = 0; i < 32; ++i)
>      {
>        do_test (0, 0, i, 0);
>        do_test (0, 0, i, 1);
>        do_test (0, 0, i, -1);
> +      do_test (4096 - i, 0, i, 0);
> +      do_test (4096 - i, 0, i, 1);
> +      do_test (4096 - i, 0, i, -1);
> +      do_test (4095, 0, i, 0);
> +      do_test (4095, 0, i, 1);
> +      do_test (4095, 0, i, -1);
> +      do_test (4095, 4095, i, 0);
> +      do_test (4095, 4095, i, 1);
> +      do_test (4095, 4095, i, -1);
> +      do_test (4000, 95, i, 0);
> +      do_test (4000, 95, i, 1);
> +      do_test (4000, 95, i, -1);
> +    }
> +
> +  for (i = 33; i < 385; i += 32)
> +    {
> +      do_test (0, 0, i, 0);
> +      do_test (0, 0, i, 1);
> +      do_test (0, 0, i, -1);
> +      do_test (i, 0, i, 0);
> +      do_test (0, i, i, 1);
> +      do_test (i, i, i, -1);
>      }
>
>    for (i = 1; i < 10; ++i)
> @@ -506,13 +528,19 @@ test_main (void)
>        do_test (0, 0, 2 << i, 0);
>        do_test (0, 0, 2 << i, 1);
>        do_test (0, 0, 2 << i, -1);
> -      do_test (0, 0, 16 << i, 0);
>        do_test ((8 - i) * CHARBYTES, (2 * i) * CHARBYTES, 16 << i, 0);
> +      do_test (0, 0, 16 << i, 0);
>        do_test (0, 0, 16 << i, 1);
>        do_test (0, 0, 16 << i, -1);
> +      do_test (i, 0, 2 << i, 0);
> +      do_test (0, i, 2 << i, 1);
> +      do_test (i, i, 2 << i, -1);
> +      do_test (i, 0, 16 << i, 0);
> +      do_test (0, i, 16 << i, 1);
> +      do_test (i, i, 16 << i, -1);
>      }
>
> -  for (i = 1; i < 8; ++i)
> +  for (i = 1; i < 10; ++i)
>      {
>        do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 0);
>        do_test (i * CHARBYTES, 2 * (i * CHARBYTES), 8 << i, 1);
> --
> 2.29.2
>

LGTM.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

Thanks.