radeon-llvm: Start multithreaded before using llvm.
This is required to make some of llvm's api calls thread save. In particular the PassRegistry, which is implicitly accessed while compiling shader programs. The PassRegistry uses a mutex that is only active if the llvm_is_multithreaded() returns true. Calling llvm_start_multithreading() makes this happen and by calling this function we try to make sure that we can savely compile shaders in paralell. Since there is also a call llvm_stop_multithreading() in the llvm api, we cannot guarantee that this does not get switched off while we are relying on this being set, but for the easier use cases this fixes a race with the radeon llvm compiler we have as of today. Signed-off-by: Mathias Froehlich <Mathias.Froehlich@web.de> Signed-off-by: Tom Stellard <thomas.stellard@amd.com>
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@ -35,6 +35,7 @@
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#include <llvm/Support/SourceMgr.h>
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#include <llvm/Support/TargetRegistry.h>
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#include <llvm/Support/TargetSelect.h>
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#include <llvm/Support/Threading.h>
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#include <llvm/Target/TargetData.h>
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#include <llvm/Target/TargetMachine.h>
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@ -57,6 +58,20 @@ void LLVMInitializeAMDGPUTargetInfo(void);
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}
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#endif
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namespace {
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class LLVMEnsureMultithreaded {
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public:
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LLVMEnsureMultithreaded()
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{
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llvm_start_multithreaded();
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}
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};
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static LLVMEnsureMultithreaded lLVMEnsureMultithreaded;
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}
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/**
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* Compile an LLVM module to machine code.
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*
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