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benchtests: Add partial overlap case in bench-memmove-walk.c

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This commit adds a new partial overlap benchmark. This is generally
the most interesting performance case for memmove and was missing.

Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Noah Goldstein 2021-11-01 00:49:50 -05:00
parent 5e6cce9b34
commit ac759b1fbf
1 changed files with 46 additions and 15 deletions
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47
benchtests/bench-memmove-walk.c
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@ -36,6 +36,10 @@
# define TIMEOUT (20 * 60)
# include "bench-string.h"
#define NO_OVERLAP 0
#define PARTIAL_OVERLAP 1
#define COMPLETE_OVERLAP 2
IMPL (memmove, 1)
#endif
@ -66,20 +70,40 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src,
}
static void
do_test (json_ctx_t *json_ctx, size_t len, bool overlap)
do_test (json_ctx_t *json_ctx, size_t len, int overlap, int both_ways)
{
char *s1, *s2, *tmp;
size_t repeats;
s1 = (char *) (buf1);
s2 = (char *) (buf2);
if (overlap != NO_OVERLAP)
s2 = s1;
if (overlap == PARTIAL_OVERLAP)
s2 += len / 2;
for (repeats = both_ways ? 2 : 1; repeats; --repeats)
{
json_element_object_begin (json_ctx);
json_attr_uint (json_ctx, "length", (double) len);
json_attr_string(json_ctx, "overlap",
overlap == NO_OVERLAP ? "none"
: overlap == PARTIAL_OVERLAP ? "partial"
: "complete");
json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1));
json_array_begin (json_ctx, "timings");
if (overlap)
buf2 = buf1;
FOR_EACH_IMPL (impl, 0)
do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, len);
json_array_end (json_ctx);
json_element_object_end (json_ctx);
tmp = s1;
s1 = s2;
s2 = tmp;
}
}
int
@ -107,15 +131,22 @@ test_main (void)
/* Non-overlapping buffers. */
for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{
do_test (&json_ctx, i, false);
do_test (&json_ctx, i + 1, false);
do_test (&json_ctx, i, NO_OVERLAP, 1);
do_test (&json_ctx, i + 1, NO_OVERLAP, 1);
}
/* Overlapping buffers. */
/* Partially-overlapping buffers. */
for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE / 2; i <<= 1)
{
do_test (&json_ctx, i, PARTIAL_OVERLAP, 1);
do_test (&json_ctx, i + 1, PARTIAL_OVERLAP, 1);
}
/* Complete-overlapping buffers. */
for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1)
{
do_test (&json_ctx, i, true);
do_test (&json_ctx, i + 1, true);
do_test (&json_ctx, i, COMPLETE_OVERLAP, 0);
do_test (&json_ctx, i + 1, COMPLETE_OVERLAP, 0);
}
json_array_end (&json_ctx);