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Some performance optimizations (#5424)

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* Some performance optimizations

This is globally removing some memory useless copy

* use a const ref return on std::string Settings::get to prevent data copy on getters which doesn't need to copy it
 * pass some stack created strings to static const as they are not modified anywhere
 * Camera: return nametags per const ref instead of a list pointer, we only need to read it
 * INodeDefManager: getAll should be a result ref writer instead of a return copy
 * INodeDefManager: getAlias should return a const std::string ref
 * Minimap: unroll a Scolor creation in blitMinimapPixersToImageRadar to prvent many variable construct/destruct which are unneeded (we rewrite the content in the loop)
 * CNodeDefManager::updateAliases: prevent a idef getall copy
 * Profiler: constness
 * rollback_interface: create real_name later, and use const ref
 * MapBlockMesh updateFastFaceRow: unroll TileSpec next_tile, which has a cost of 1.8% CPU due to variable allocation/destruction,
 * MapBlockMesh updateFastFaceRow: copy next_tile to tile only if it's a different tilespec
 * MapBlockMesh updateFastFaceRow: use memcpy to copy next_lights to lights to do it in a single cpu operation
This commit is contained in:
Loïc Blot 2017-03-22 21:41:02 +01:00 • committed by GitHub
parent 9efc5da0fb
commit 072bbba69a
16 changed files with 79 additions and 134 deletions
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7
src/itemdef.cpp
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@ -275,16 +275,16 @@ public:
assert(i != m_item_definitions.end());
return *(i->second);
}
virtual std::string getAlias(const std::string &name) const
virtual const std::string &getAlias(const std::string &name) const
{
StringMap::const_iterator it = m_aliases.find(name);
if (it != m_aliases.end())
return it->second;
return name;
}
virtual std::set<std::string> getAll() const
virtual void getAll(std::set<std::string> &result) const
{
std::set<std::string> result;
result.clear();
for(std::map<std::string, ItemDefinition *>::const_iterator
it = m_item_definitions.begin();
it != m_item_definitions.end(); ++it) {
@ -295,7 +295,6 @@ public:
it != m_aliases.end(); ++it) {
result.insert(it->first);
}
return result;
}
virtual bool isKnown(const std::string &name_) const
{