AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-24 14:00:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

Bench: Improve benchtests for memchr, strchr, strnlen, strrchr

Browse Source 
1. Add more complete coverage in the medium size range.
2. In strnlen remove the `1 << i` which was UB (`i` could go beyond
   32/64)
This commit is contained in:
Noah Goldstein 2022-10-18 17:44:09 -07:00
parent b412213eee
commit 643a2d0139
5 changed files with 135 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
benchtests/bench-memchr.c
View File

@ -126,7 +126,7 @@ do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len,
int
test_main (void)
{
size_t i;
size_t i, j, al, al_max;
int repeats;
json_ctx_t json_ctx;
test_init ();
@ -147,35 +147,46 @@ test_main (void)
json_array_begin (&json_ctx, "results");
al_max = 0;
#ifdef USE_AS_MEMRCHR
al_max = getpagesize () / 2;
#endif
for (repeats = 0; repeats < 2; ++repeats)
{
for (al = 0; al <= al_max; al += getpagesize () / 2)
{
for (i = 1; i < 8; ++i)
{
do_test (&json_ctx, 0, 16 << i, 2048, 23, repeats);
do_test (&json_ctx, i, 64, 256, 23, repeats);
do_test (&json_ctx, 0, 16 << i, 2048, 0, repeats);
do_test (&json_ctx, i, 64, 256, 0, repeats);
do_test (&json_ctx, al, 16 << i, 2048, 23, repeats);
do_test (&json_ctx, al + i, 64, 256, 23, repeats);
do_test (&json_ctx, al, 16 << i, 2048, 0, repeats);
do_test (&json_ctx, al + i, 64, 256, 0, repeats);
do_test (&json_ctx, getpagesize () - 15, 64, 256, 0, repeats);
do_test (&json_ctx, al + getpagesize () - 15, 64, 256, 0,
repeats);
#ifdef USE_AS_MEMRCHR
/* Also test the position close to the beginning for memrchr. */
do_test (&json_ctx, 0, i, 256, 23, repeats);
do_test (&json_ctx, 0, i, 256, 0, repeats);
do_test (&json_ctx, i, i, 256, 23, repeats);
do_test (&json_ctx, i, i, 256, 0, repeats);
do_test (&json_ctx, al, i, 256, 23, repeats);
do_test (&json_ctx, al, i, 256, 0, repeats);
do_test (&json_ctx, al + i, i, 256, 23, repeats);
do_test (&json_ctx, al + i, i, 256, 0, repeats);
#endif
}
for (i = 1; i < 8; ++i)
{
do_test (&json_ctx, i, i << 5, 192, 23, repeats);
do_test (&json_ctx, i, i << 5, 192, 0, repeats);
do_test (&json_ctx, i, i << 5, 256, 23, repeats);
do_test (&json_ctx, i, i << 5, 256, 0, repeats);
do_test (&json_ctx, i, i << 5, 512, 23, repeats);
do_test (&json_ctx, i, i << 5, 512, 0, repeats);
do_test (&json_ctx, al + i, i << 5, 192, 23, repeats);
do_test (&json_ctx, al + i, i << 5, 192, 0, repeats);
do_test (&json_ctx, al + i, i << 5, 256, 23, repeats);
do_test (&json_ctx, al + i, i << 5, 256, 0, repeats);
do_test (&json_ctx, al + i, i << 5, 512, 23, repeats);
do_test (&json_ctx, al + i, i << 5, 512, 0, repeats);
do_test (&json_ctx, getpagesize () - 15, i << 5, 256, 23, repeats);
do_test (&json_ctx, al + getpagesize () - 15, i << 5, 256, 23,
repeats);
}
}
for (i = 1; i < 32; ++i)
{
do_test (&json_ctx, 0, i, i + 1, 23, repeats);
@ -207,6 +218,24 @@ test_main (void)
do_test (&json_ctx, 0, 2, i + 1, 0, repeats);
#endif
}
for (al = 0; al <= al_max; al += getpagesize () / 2)
{
for (i = (16 / sizeof (CHAR)); i <= (8192 / sizeof (CHAR)); i += i)
{
for (j = 0; j <= (384 / sizeof (CHAR));
j += (32 / sizeof (CHAR)))
{
do_test (&json_ctx, al, i + j, i, 23, repeats);
do_test (&json_ctx, al, i, i + j, 23, repeats);
if (j < i)
{
do_test (&json_ctx, al, i - j, i, 23, repeats);
do_test (&json_ctx, al, i, i - j, 23, repeats);
}
}
}
}
#ifndef USE_AS_MEMRCHR
break;
#endif

28
benchtests/bench-rawmemchr.c
View File

@ -70,7 +70,7 @@ do_test (json_ctx_t *json_ctx, size_t align, size_t pos, size_t len, int seek_ch
size_t i;
char *result;
align &= 7;
align &= getpagesize () - 1;
if (align + len >= page_size)
return;
@ -106,7 +106,6 @@ test_main (void)
{
json_ctx_t json_ctx;
size_t i;
test_init ();
json_init (&json_ctx, 0, stdout);
@ -137,6 +136,31 @@ test_main (void)
do_test (&json_ctx, 0, i, i + 1, 23);
do_test (&json_ctx, 0, i, i + 1, 0);
}
for (; i < 256; i += 32)
{
do_test (&json_ctx, 0, i, i + 1, 23);
do_test (&json_ctx, 0, i - 1, i, 23);
}
for (; i < 512; i += 64)
{
do_test (&json_ctx, 0, i, i + 1, 23);
do_test (&json_ctx, 0, i - 1, i, 23);
}
for (; i < 1024; i += 128)
{
do_test (&json_ctx, 0, i, i + 1, 23);
do_test (&json_ctx, 0, i - 1, i, 23);
}
for (; i < 2048; i += 256)
{
do_test (&json_ctx, 0, i, i + 1, 23);
do_test (&json_ctx, 0, i - 1, i, 23);
}
for (; i < 4096; i += 512)
{
do_test (&json_ctx, 0, i, i + 1, 23);
do_test (&json_ctx, 0, i - 1, i, 23);
}
json_array_end (&json_ctx);
json_attr_object_end (&json_ctx);

35
benchtests/bench-strchr.c
View File

@ -287,8 +287,8 @@ int
test_main (void)
{
json_ctx_t json_ctx;
size_t i;
size_t i, j;
test_init ();
json_init (&json_ctx, 0, stdout);
@ -367,15 +367,30 @@ test_main (void)
do_test (&json_ctx, 0, i, i + 1, 0, BIG_CHAR);
}
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.0);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.1);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.25);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.33);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.5);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.66);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.75);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 0.9);
DO_RAND_TEST(&json_ctx, 0, 15, 16, 1.0);
for (i = 16 / sizeof (CHAR); i <= 8192 / sizeof (CHAR); i += i)
{
for (j = 32 / sizeof (CHAR); j <= 320 / sizeof (CHAR);
j += 32 / sizeof (CHAR))
{
do_test (&json_ctx, 0, i, i + j, 0, MIDDLE_CHAR);
do_test (&json_ctx, 0, i + j, i, 0, MIDDLE_CHAR);
if (i > j)
{
do_test (&json_ctx, 0, i, i - j, 0, MIDDLE_CHAR);
do_test (&json_ctx, 0, i - j, i, 0, MIDDLE_CHAR);
}
}
}
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.0);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.1);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.25);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.33);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.5);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.66);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.75);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 0.9);
DO_RAND_TEST (&json_ctx, 0, 15, 16, 1.0);
json_array_end (&json_ctx);
json_attr_object_end (&json_ctx);

12
benchtests/bench-strnlen.c
View File

@ -195,19 +195,19 @@ test_main (void)
{
for (j = 0; j <= (704 / sizeof (CHAR)); j += (32 / sizeof (CHAR)))
{
do_test (&json_ctx, 0, 1 << i, (i + j), BIG_CHAR);
do_test (&json_ctx, 0, i + j, i, BIG_CHAR);
do_test (&json_ctx, 64, 1 << i, (i + j), BIG_CHAR);
do_test (&json_ctx, 64, i + j, i, BIG_CHAR);
do_test (&json_ctx, 0, i, i + j, BIG_CHAR);
do_test (&json_ctx, 64, i, i + j, BIG_CHAR);
if (j < i)
{
do_test (&json_ctx, 0, 1 << i, i - j, BIG_CHAR);
do_test (&json_ctx, 0, i - j, i, BIG_CHAR);
do_test (&json_ctx, 64, 1 << i, i - j, BIG_CHAR);
do_test (&json_ctx, 64, i - j, i, BIG_CHAR);
do_test (&json_ctx, 0, i, i - j, BIG_CHAR);
do_test (&json_ctx, 64, i, i - j, BIG_CHAR);
}
}
}

28
benchtests/bench-strrchr.c
View File

@ -151,7 +151,7 @@ int
test_main (void)
{
json_ctx_t json_ctx;
size_t i, j;
size_t i, j, k;
int seek;
test_init ();
@ -173,7 +173,7 @@ test_main (void)
for (seek = 0; seek <= 23; seek += 23)
{
for (j = 1; j < 32; j += j)
for (j = 1; j <= 256; j = (j * 4))
{
for (i = 1; i < 9; ++i)
{
@ -197,6 +197,30 @@ test_main (void)
do_test (&json_ctx, getpagesize () - i / 2 - 1, i, i + 1, seek,
SMALL_CHAR, j);
}
for (i = (16 / sizeof (CHAR)); i <= (288 / sizeof (CHAR)); i += 32)
{
do_test (&json_ctx, 0, i - 16, i, seek, SMALL_CHAR, j);
do_test (&json_ctx, 0, i, i + 16, seek, SMALL_CHAR, j);
}
for (i = (16 / sizeof (CHAR)); i <= (2048 / sizeof (CHAR)); i += i)
{
for (k = 0; k <= (288 / sizeof (CHAR));
k += (48 / sizeof (CHAR)))
{
do_test (&json_ctx, 0, k, i, seek, SMALL_CHAR, j);
do_test (&json_ctx, 0, i, i + k, seek, SMALL_CHAR, j);
if (k < i)
{
do_test (&json_ctx, 0, i - k, i, seek, SMALL_CHAR, j);
do_test (&json_ctx, 0, k, i - k, seek, SMALL_CHAR, j);
do_test (&json_ctx, 0, i, i - k, seek, SMALL_CHAR, j);
}
}
}
if (seek == 0)
{
break;