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Replace constant expressions that contain multiplications by

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fractional floating point values with integer divides.  This will
eliminate any chance that the compiler will generate code to evaluate
the expression using floating point at runtime.

Suggested by:	bde
Submitted by:	Rasool Al-Saadi <ralsaadi@swin.edu.au>
MFC after:	8 days (with r300779 and r300949)
This commit is contained in:
Don Lewis 2016-06-01 20:04:24 +00:00
parent dc3be4f872
commit d673654796
3 changed files with 30 additions and 28 deletions
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12
sys/netpfil/ipfw/dn_aqm_pie.c
View File

@ -244,17 +244,17 @@ calculate_drop_prob(void *x)
p *= (PIE_MAX_PROB << 12) / AQM_TIME_1S;
/* auto-tune drop probability */
if (prob < (int64_t)(PIE_MAX_PROB * 0.000001))
if (prob < (PIE_MAX_PROB / 1000000)) /* 0.000001 */
p >>= 11 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.00001))
else if (prob < (PIE_MAX_PROB / 100000)) /* 0.00001 */
p >>= 9 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.0001))
else if (prob < (PIE_MAX_PROB / 10000)) /* 0.0001 */
p >>= 7 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.001))
else if (prob < (PIE_MAX_PROB / 1000)) /* 0.001 */
p >>= 5 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.01))
else if (prob < (PIE_MAX_PROB / 100)) /* 0.01 */
p >>= 3 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.1))
else if (prob < (PIE_MAX_PROB / 10)) /* 0.1 */
p >>= 1 + PIE_FIX_POINT_BITS + 12;
else
p >>= PIE_FIX_POINT_BITS + 12;

6
sys/netpfil/ipfw/dn_aqm_pie.h
View File

@ -132,11 +132,13 @@ drop_early(struct pie_status *pst, uint32_t qlen)
* if accu_prob < 0.85 -> enqueue
* if accu_prob>8.5 ->drop
* between 0.85 and 8.5 || !De-randomize --> drop on prob
*
* (0.85 = 17/20 ,8.5 = 17/2)
*/
if (pprms->flags & PIE_DERAND_ENABLED) {
if(pst->accu_prob < (uint64_t) (PIE_MAX_PROB * 0.85))
if(pst->accu_prob < (uint64_t) (PIE_MAX_PROB * 17 / 20))
return ENQUE;
if( pst->accu_prob >= (uint64_t) (PIE_MAX_PROB * 8.5))
if( pst->accu_prob >= (uint64_t) (PIE_MAX_PROB * 17 / 2))
return DROP;
}

12
sys/netpfil/ipfw/dn_sched_fq_pie.c
View File

@ -407,17 +407,17 @@ fq_calculate_drop_prob(void *x)
p *= (PIE_MAX_PROB << 12) / AQM_TIME_1S;
/* auto-tune drop probability */
if (prob < (int64_t)(PIE_MAX_PROB * 0.000001))
if (prob < (PIE_MAX_PROB / 1000000)) /* 0.000001 */
p >>= 11 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.00001))
else if (prob < (PIE_MAX_PROB / 100000)) /* 0.00001 */
p >>= 9 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.0001))
else if (prob < (PIE_MAX_PROB / 10000)) /* 0.0001 */
p >>= 7 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.001))
else if (prob < (PIE_MAX_PROB / 1000)) /* 0.001 */
p >>= 5 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.01))
else if (prob < (PIE_MAX_PROB / 100)) /* 0.01 */
p >>= 3 + PIE_FIX_POINT_BITS + 12;
else if (prob < (int64_t)(PIE_MAX_PROB * 0.1))
else if (prob < (PIE_MAX_PROB / 10)) /* 0.1 */
p >>= 1 + PIE_FIX_POINT_BITS + 12;
else
p >>= PIE_FIX_POINT_BITS + 12;