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Speedup ReachingDefs logic by ~15%

Browse source 
Mainly from the potential of ReachingDefs::AddRD() performing a
redundant map lookup that it had just done.
This commit is contained in:
Jon Siwek 2021-02-04 17:23:14 -08:00
parent 2c04054975
commit d7dfb16909
2 changed files with 32 additions and 22 deletions
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46
src/script_opt/ReachingDefs.cc
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@ -21,25 +21,21 @@ ReachingDefs::ReachingDefs(RDPtr rd)
void ReachingDefs::AddRD(const DefinitionItem* di, const DefinitionPoint& dp)
{
if ( HasPair(di, dp) )
auto points = FindItem(di);
if ( points && HasPoint(dp, *points) )
return;
CopyMapIfNeeded();
auto curr_defs = my_rd_map->find(di);
if ( curr_defs == my_rd_map->end() )
if ( ! my_rd_map )
{
auto dps = std::make_unique<List<DefinitionPoint>>();
dps->push_back(dp);
(*my_rd_map)[di] = std::move(dps);
CopyMap();
points = FindItem(di);
}
if ( points )
points->push_back(dp);
else
{
auto& dps = curr_defs->second;
dps->push_back(dp);
}
my_rd_map->emplace(di, std::make_unique<DefPoints>(&dp, 1));
}
void ReachingDefs::AddOrFullyReplace(const DefinitionItem* di,
@ -121,14 +117,25 @@ RDPtr ReachingDefs::IntersectWithConsolidation(const RDPtr& r,
bool ReachingDefs::HasPair(const DefinitionItem* di, const DefinitionPoint& dp)
const
{
auto points = FindItem(di);
return points && HasPoint(dp, *points);
}
DefPoints* ReachingDefs::FindItem(const DefinitionItem* di) const
{
const auto& map = RDMap();
auto it = map->find(di);
auto l = map->find(di);
if ( l == map->end() )
return false;
if ( it == map->end() )
return nullptr;
for ( const auto& l_dp : *l->second )
return it->second.get();
}
bool ReachingDefs::HasPoint(const DefinitionPoint& dp, const DefPoints& dps) const
{
for ( const auto& l_dp : dps )
if ( l_dp.SameAs(dp) )
return true;
@ -142,11 +149,8 @@ void ReachingDefs::AddRDs(const std::shared_ptr<ReachingDefsMap>& rd_m)
AddRD(one_rd.first, dp);
}
void ReachingDefs::CopyMapIfNeeded()
void ReachingDefs::CopyMap()
{
if ( my_rd_map )
return;
my_rd_map = std::make_shared<ReachingDefsMap>();
auto old_const_rd_map = std::move(const_rd_map);
const_rd_map = nullptr;