[llvm] r307578 - Use DenseMap instead std::map for GVSummaryMapTy.

[Dehao Chen via llvm-commits]

Author: dehao
Date: Mon Jul 10 13:12:54 2017
New Revision: 307578

URL: http://llvm.org/viewvc/llvm-project?rev=307578&view=rev
Log:
Use DenseMap instead std::map for GVSummaryMapTy.

Summary: This speeds-up thin-link by ~47% for large programs.

Reviewers: tejohnson

Reviewed By: tejohnson

Subscribers: sanjoy, llvm-commits, mehdi_amini

Differential Revision: https://reviews.llvm.org/D35148

Modified:
    llvm/trunk/include/llvm/IR/ModuleSummaryIndex.h
    llvm/trunk/lib/LTO/LTO.cpp

Modified: llvm/trunk/include/llvm/IR/ModuleSummaryIndex.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/IR/ModuleSummaryIndex.h?rev=307578&r1=307577&r2=307578&view=diff
==============================================================================
--- llvm/trunk/include/llvm/IR/ModuleSummaryIndex.h (original)
+++ llvm/trunk/include/llvm/IR/ModuleSummaryIndex.h Mon Jul 10 13:12:54 2017
@@ -522,7 +522,7 @@ using ModulePathStringTableTy = StringMa
 
 /// Map of global value GUID to its summary, used to identify values defined in
 /// a particular module, and provide efficient access to their summary.
-using GVSummaryMapTy = std::map<GlobalValue::GUID, GlobalValueSummary *>;
+using GVSummaryMapTy = DenseMap<GlobalValue::GUID, GlobalValueSummary *>;
 
 /// Class to hold module path string table and global value map,
 /// and encapsulate methods for operating on them.

Modified: llvm/trunk/lib/LTO/LTO.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/LTO/LTO.cpp?rev=307578&r1=307577&r2=307578&view=diff
==============================================================================
--- llvm/trunk/lib/LTO/LTO.cpp (original)
+++ llvm/trunk/lib/LTO/LTO.cpp Mon Jul 10 13:12:54 2017
@@ -1030,7 +1030,7 @@ Error LTO::runThinLTO(AddStreamFn AddStr
 
   // Collect for each module the list of function it defines (GUID ->
   // Summary).
-  StringMap<std::map<GlobalValue::GUID, GlobalValueSummary *>>
+  StringMap<GVSummaryMapTy>
       ModuleToDefinedGVSummaries(ThinLTO.ModuleMap.size());
   ThinLTO.CombinedIndex.collectDefinedGVSummariesPerModule(
       ModuleToDefinedGVSummaries);