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Author SHA1 Message Date
Peter Collingbourne 592ee15e14 Support: Support LLVM_ENABLE_THREADS=0 in llvm/Support/thread.h. 
Specifically, the header now provides llvm::thread, which is either a
typedef of std::thread or a replacement that calls the function synchronously
depending on the value of LLVM_ENABLE_THREADS.

llvm-svn: 246402
 2015-08-31 00:09:01 +00:00
Peter Collingbourne c269ed5115 CodeGen: Introduce splitCodeGen and teach LTOCodeGenerator to use it. 
llvm::splitCodeGen is a function that implements the core of parallel LTO
code generation. It uses llvm::SplitModule to split the module into linkable
partitions and spawning one code generation thread per partition. The function
produces multiple object files which can be linked in the usual way.

This has been threaded through to LTOCodeGenerator (and llvm-lto for testing
purposes). Separate patches will add parallel LTO support to the gold plugin
and lld.

Differential Revision: http://reviews.llvm.org/D12260

llvm-svn: 246236
 2015-08-27 23:37:36 +00:00