Add to the split module utility an SCC based method which allows not to globalize any local variables.

    
    Summary:
    Currently llvm::SplitModule as the first step globalizes all local objects, which might not be desirable in some scenarios.
    This change adds a new flag to llvm::SplitModule that uses SCC approach to search for a balanced partition without the need to externalize symbols.
    Such partition might not be possible or fully balanced for a given number of partitions, and is a function of the module properties (global/local dependencies within the module).
    
    Joint development Tobias Edler von Koch (tobias@codeaurora.org) and Sergei Larin (slarin@codeaurora.org)
    
    Subscribers: llvm-commits, joker.eph
    
    Differential Revision: http://reviews.llvm.org/D16124

llvm-svn: 258083

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/ParallelCG.cpp b/llvm/lib/CodeGen/ParallelCG.cpp
index e73ba029604..d93cb9192d4 100644
--- a/llvm/lib/CodeGen/ParallelCG.cpp
+++ b/llvm/lib/CodeGen/ParallelCG.cpp
@@ -44,7 +44,8 @@ llvm::splitCodeGen(std::unique_ptr<Module> M,
                    ArrayRef<llvm::raw_pwrite_stream *> OSs, StringRef CPU,
                    StringRef Features, const TargetOptions &Options,
                    Reloc::Model RM, CodeModel::Model CM, CodeGenOpt::Level OL,
-                   TargetMachine::CodeGenFileType FileType) {
+                   TargetMachine::CodeGenFileType FileType,
+                   bool PreserveLocals) {
   StringRef TripleStr = M->getTargetTriple();
   std::string ErrMsg;
   const Target *TheTarget = TargetRegistry::lookupTarget(TripleStr, ErrMsg);
@@ -87,7 +88,7 @@ llvm::splitCodeGen(std::unique_ptr<Module> M,
         // Pass BC using std::move to ensure that it get moved rather than
         // copied into the thread's context.
         std::move(BC));
-  });
+  }, PreserveLocals);
 
   for (thread &T : Threads)
     T.join();