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Suppress division by zero warning

Browse source 
Coverity is optimistic that we might do thousands of hashes in less
than a microsecond.

    /tests/bench/siphash.c: 54 in main()
    48     			count++;
    49     		}
    50
    51     		isc_time_now_hires(&finish);
    52
    53     		us = isc_time_microdiff(&finish, &start);
    >>>     CID 358309:  Integer handling issues  (DIVIDE_BY_ZERO)
    >>>     In expression "count * 1000UL / us", division by expression "us" which may be zero has undefined behavior.
    54     		printf("%f us wide-lower len %3zu, %7llu kh/s (%llx)\n",
    55     		       (double)us / 1000000.0, len,
    56     		       (unsigned long long)(count * 1000 / us),
    57     		       (unsigned long long)sum);
    58     	}
    59
This commit is contained in:
Tony Finch 2022-10-05 12:31:42 +01:00
parent 61b3dcc086
commit cf715d488b
1 changed files with 14 additions and 18 deletions
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32
tests/bench/siphash.c
View file

@ -23,6 +23,8 @@
#define SIZE (1024 * 1024)
#define KILOHASHES(count, us) ((us) == 0 ? 0.0 : ((count)*1000.0 / (us)))
int
main(void) {
static uint8_t bytes[SIZE];
@ -51,9 +53,8 @@ main(void) {
isc_time_now_hires(&finish);
us = isc_time_microdiff(&finish, &start);
printf("%f us wide-lower len %3zu, %7llu kh/s (%llx)\n",
(double)us / 1000000.0, len,
(unsigned long long)(count * 1000 / us),
printf("%f us wide-lower len %3zu, %7.0f kh/s (%llx)\n",
(double)us / 1000000.0, len, KILOHASHES(count, us),
(unsigned long long)sum);
}
@ -76,9 +77,8 @@ main(void) {
isc_time_now_hires(&finish);
us = isc_time_microdiff(&finish, &start);
printf("%f us wide-icase len %3zu, %7llu kh/s (%llx)\n",
(double)us / 1000000.0, len,
(unsigned long long)(count * 1000 / us),
printf("%f us wide-icase len %3zu, %7.0f kh/s (%llx)\n",
(double)us / 1000000.0, len, KILOHASHES(count, us),
(unsigned long long)sum);
}
for (size_t len = 256; len > 0; len = len * 4 / 5) {
@ -100,9 +100,8 @@ main(void) {
isc_time_now_hires(&finish);
us = isc_time_microdiff(&finish, &start);
printf("%f us wide-bytes len %3zu, %7llu kh/s (%llx)\n",
(double)us / 1000000.0, len,
(unsigned long long)(count * 1000 / us),
printf("%f us wide-bytes len %3zu, %7.0f kh/s (%llx)\n",
(double)us / 1000000.0, len, KILOHASHES(count, us),
(unsigned long long)sum);
}
@ -126,9 +125,8 @@ main(void) {
isc_time_now_hires(&finish);
us = isc_time_microdiff(&finish, &start);
printf("%f us half-lower len %3zu, %7llu kh/s (%llx)\n",
(double)us / 1000000.0, len,
(unsigned long long)(count * 1000 / us),
printf("%f us half-lower len %3zu, %7.0f kh/s (%llx)\n",
(double)us / 1000000.0, len, KILOHASHES(count, us),
(unsigned long long)sum);
}
@ -151,9 +149,8 @@ main(void) {
isc_time_now_hires(&finish);
us = isc_time_microdiff(&finish, &start);
printf("%f us half-icase len %3zu, %7llu kh/s (%llx)\n",
(double)us / 1000000.0, len,
(unsigned long long)(count * 1000 / us),
printf("%f us half-icase len %3zu, %7.0f kh/s (%llx)\n",
(double)us / 1000000.0, len, KILOHASHES(count, us),
(unsigned long long)sum);
}
@ -176,9 +173,8 @@ main(void) {
isc_time_now_hires(&finish);
us = isc_time_microdiff(&finish, &start);
printf("%f us half-bytes len %3zu, %7llu kh/s (%llx)\n",
(double)us / 1000000.0, len,
(unsigned long long)(count * 1000 / us),
printf("%f us half-bytes len %3zu, %7.0f kh/s (%llx)\n",
(double)us / 1000000.0, len, KILOHASHES(count, us),
(unsigned long long)sum);
}
}