85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
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#include "internal.h"
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#include "logging.h"
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void
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kissat_enable_reluctant (reluctant * reluctant,
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uint64_t period, uint64_t limit)
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{
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if (limit && period > limit)
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period = limit;
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reluctant->limited = (limit > 0);
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reluctant->trigger = false;
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reluctant->period = period;
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reluctant->wait = period;
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reluctant->u = reluctant->v = 1;
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reluctant->limit = limit;
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}
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void
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kissat_disable_reluctant (reluctant * reluctant)
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{
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reluctant->period = 0;
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}
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void
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kissat_tick_reluctant (reluctant * reluctant)
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{
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if (!reluctant->period)
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return;
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if (reluctant->trigger)
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return;
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assert (reluctant->wait > 0);
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if (--reluctant->wait)
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return;
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uint64_t u = reluctant->u;
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uint64_t v = reluctant->v;
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if ((u & -u) == v)
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{
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u++;
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v = 1;
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}
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else
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{
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assert (UINT64_MAX / 2 >= v);
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v *= 2;
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}
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assert (v);
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assert (UINT64_MAX / v >= reluctant->period);
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uint64_t wait = v * reluctant->period;
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if (reluctant->limited && wait > reluctant->limit)
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{
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u = v = 1;
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wait = reluctant->period;
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}
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reluctant->trigger = true;
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reluctant->wait = wait;
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reluctant->u = u;
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reluctant->v = v;
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}
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void
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kissat_init_reluctant (kissat * solver)
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{
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if (GET_OPTION (reluctant))
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{
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LOG ("enable reluctant doubling with period %d limit %d",
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GET_OPTION (reluctantint), GET_OPTION (reluctantlim));
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kissat_enable_reluctant (&solver->reluctant,
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GET_OPTION (reluctantint),
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GET_OPTION (reluctantlim));
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}
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else
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{
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LOG ("reluctant doubling disabled and thus no stable restarts");
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kissat_disable_reluctant (&solver->reluctant);
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}
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}
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