Turn optimizations on! (Except for full inlining...)

Author: Axel-Naumann

interpreter/cling/lib/Interpreter/BackendPasses.cpp

@@ -42,7 +42,8 @@ void BackendPasses::CreatePasses(llvm::Module& M)
   // DON'T: we will not find our symbols...
   //CGOpts_.CXXCtorDtorAliases = 1;
 
-  // Default clang -O2 on Linux 64bit also has:
+  // Default clang -O2 on Linux 64bit also has the following, but see
+  // CIFactory.cpp.
 #if 0
   CGOpts_.DisableFPElim = 0;
   CGOpts_.DiscardValueNames = 1;
@@ -71,9 +72,6 @@ void BackendPasses::CreatePasses(llvm::Module& M)
     // Inlining = CGOpts.NoInlining;
   }
 
-  OptLevel = 0; // we need to keep even "unused" values - until we
-  // feed incremental modules into the JIT.
-
   llvm::PassManagerBuilder PMBuilder;
   PMBuilder.OptLevel = OptLevel;
   PMBuilder.SizeLevel = m_CGOpts.OptimizeSize;

interpreter/cling/lib/Interpreter/CIFactory.cpp

@@ -934,6 +934,15 @@ static void stringifyPreprocSetting(PreprocessorOptions& PPOpts,
     CI->getCodeGenOpts().EmitCodeView = 1;
     CI->getCodeGenOpts().CXXCtorDtorAliases = 1;
 #endif
+     // Reduce amount of emitted symbols by optimizing more.
+    CI->getCodeGenOpts().OptimizationLevel = 2;
+    // Taken from a -O2 run of clang:
+    CI->getCodeGenOpts().DiscardValueNames = 1;
+    CI->getCodeGenOpts().OmitLeafFramePointer = 1;
+    CI->getCodeGenOpts().UnrollLoops = 1;
+    CI->getCodeGenOpts().VectorizeLoop = 1;
+    CI->getCodeGenOpts().VectorizeSLP = 1;
+
     //CI->getCodeGenOpts().setDebugInfo(clang::CodeGenOptions::FullDebugInfo);
     // CI->getCodeGenOpts().EmitDeclMetadata = 1; // For unloading, for later
     CI->getCodeGenOpts().CXXCtorDtorAliases = 0; // aliasing the complete