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genem: replace one recursive call by a loop

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* spot/twaalgos/genem.cc: In the spot29 implementation for the generic
case, when Fin(fo)=true and Fin(fo)=false have to be tested
separately, the second test can be done by a loop instead of a
recursion, to avoid unnecessary processing of the acceptance
condition.  Suggested by Jan Strejček.
This commit is contained in:
Alexandre Duret-Lutz 2020-06-18 15:32:54 +02:00
parent a3769dfd81
commit 9caba8bfe8
1 changed files with 39 additions and 34 deletions
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73
spot/twaalgos/genem.cc
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@ -84,40 +84,35 @@ namespace spot
acc_cond acc = autacc.restrict_to(sets);
acc = acc.remove(si.common_sets_of(scc), false);
auto generic_recurse =
[&] (const acc_cond& subacc)
{
int fo = (SPOT_UNLIKELY(genem_version == spot28)
? acc.fin_one() : subacc.fin_one());
assert(fo >= 0);
// Try to accept when Fin(fo) == true
acc_cond::mark_t fo_m = {(unsigned) fo};
if (!scc_split_check
(si, scc, subacc.remove(fo_m, true), run, fo_m))
return false;
// Try to accept when Fin(fo) == false
if (!is_scc_empty(si, scc, subacc.force_inf(fo_m), run, tocut))
return false;
return true;
};
if (SPOT_LIKELY(genem_version == spot29))
{
acc_cond::acc_code rest = acc_cond::acc_code::f();
for (const acc_cond& disjunct: acc.top_disjuncts())
if (acc_cond::mark_t fu = disjunct.fin_unit())
{
if (!scc_split_check
(si, scc, disjunct.remove(fu, true), run, fu))
return false;
}
else
{
rest |= disjunct.get_acceptance();
}
if (!rest.is_f() && !generic_recurse(acc_cond(acc.num_sets(), rest)))
return false;
}
do
{
acc_cond::acc_code rest = acc_cond::acc_code::f();
for (const acc_cond& disjunct: acc.top_disjuncts())
if (acc_cond::mark_t fu = disjunct.fin_unit())
{
if (!scc_split_check
(si, scc, disjunct.remove(fu, true), run, fu))
return false;
}
else
{
rest |= disjunct.get_acceptance();
}
if (rest.is_f())
break;
acc_cond subacc(acc.num_sets(), std::move(rest));
int fo = subacc.fin_one();
assert(fo >= 0);
// Try to accept when Fin(fo) == true
acc_cond::mark_t fo_m = {(unsigned) fo};
if (!scc_split_check
(si, scc, subacc.remove(fo_m, true), run, fo_m))
return false;
// Try to accept when Fin(fo) == false
acc = subacc.force_inf(fo_m);
}
while (!acc.is_f());
else
{
for (const acc_cond& disjunct: acc.top_disjuncts())
@ -129,7 +124,17 @@ namespace spot
}
else
{
if (!generic_recurse(disjunct))
int fo = (SPOT_UNLIKELY(genem_version == spot28)
? acc.fin_one() : disjunct.fin_one());
assert(fo >= 0);
// Try to accept when Fin(fo) == true
acc_cond::mark_t fo_m = {(unsigned) fo};
if (!scc_split_check
(si, scc, disjunct.remove(fo_m, true), run, fo_m))
return false;
// Try to accept when Fin(fo) == false
if (!is_scc_empty(si, scc, disjunct.force_inf(fo_m),
run, tocut))
return false;
}
}