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Ensure a side effect in CRC computation

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This commit is contained in:
Andrea Mazzoleni 2015-11-11 08:02:54 +01:00
parent f416d909b2
commit 54c91ec440
1 changed files with 10 additions and 2 deletions
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12
cmdline/speed.c
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@ -67,6 +67,14 @@ static int64_t diffgettimeofday(struct timeval *start, struct timeval *stop)
ds = size * (int64_t)count * nd; \
dt = diffgettimeofday(&start, &stop);
/**
* Global variable used to propagate side effects.
*
* This is required to avoid optimizing compilers
* to remove code without side effects.
*/
static unsigned side_effect;
void speed(int period)
{
struct timeval start;
@ -179,7 +187,7 @@ void speed(int period)
SPEED_START {
for (j = 0; j < nd; ++j)
crc32c_gen(0, v[j], size);
side_effect += crc32c_gen(0, v[j], size);
} SPEED_STOP
printf("%8" PRIu64, ds / dt);
@ -192,7 +200,7 @@ void speed(int period)
if (raid_cpu_has_crc32()) {
SPEED_START {
for (j = 0; j < nd; ++j)
crc32c_x86(0, v[j], size);
side_effect += crc32c_x86(0, v[j], size);
} SPEED_STOP
printf("%8" PRIu64, ds / dt);