From 072bbba69aa2528c309b76aaec288bdba52e119c Mon Sep 17 00:00:00 2001 From: Loïc Blot Date: Wed, 22 Mar 2017 21:41:02 +0100 Subject: Some performance optimizations (#5424) * 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 --- src/itemdef.cpp | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'src/itemdef.cpp') diff --git a/src/itemdef.cpp b/src/itemdef.cpp index f43e5c970..627ad1b6c 100644 --- a/src/itemdef.cpp +++ b/src/itemdef.cpp @@ -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 getAll() const + virtual void getAll(std::set &result) const { - std::set result; + result.clear(); for(std::map::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 { -- cgit v1.2.3