r600g: Handle multiple kernels in the same program v2

v2:
  - Use pc parameter of launch_grid

1 files changed, 38 insertions, 0 deletions

diff --git a/src/gallium/drivers/r600/llvm_wrapper.cpp b/src/gallium/drivers/r600/llvm_wrapper.cpp
index 174fb013c83..81f53974d11 100644
--- a/src/gallium/drivers/r600/llvm_wrapper.cpp
+++ b/src/gallium/drivers/r600/llvm_wrapper.cpp
@@ -1,9 +1,11 @@
 #include <llvm/ADT/OwningPtr.h>
 #include <llvm/ADT/StringRef.h>
 #include <llvm/LLVMContext.h>
+#include <llvm/PassManager.h>
 #include <llvm/Support/IRReader.h>
 #include <llvm/Support/MemoryBuffer.h>
 #include <llvm/Support/SourceMgr.h>
+#include <llvm/Transforms/IPO.h>
 
 #include "llvm_wrapper.h"
 
@@ -17,3 +19,39 @@ extern "C" LLVMModuleRef llvm_parse_bitcode(const unsigned char * bitcode, unsig
 	M.reset(llvm::ParseIR(buffer, Err, llvm::getGlobalContext()));
 	return wrap(M.take());
 }
+
+extern "C" void llvm_strip_unused_kernels(LLVMModuleRef mod, const char *kernel_name)
+{
+	llvm::Module *M = llvm::unwrap(mod);
+	std::vector<const char *> export_list;
+	export_list.push_back(kernel_name);
+	llvm::PassManager PM;
+	PM.add(llvm::createInternalizePass(export_list));
+	PM.add(llvm::createGlobalDCEPass());
+	PM.run(*M);
+}
+
+extern "C" unsigned llvm_get_num_kernels(const unsigned char *bitcode,
+				unsigned bitcode_len)
+{
+	LLVMModuleRef mod = llvm_parse_bitcode(bitcode, bitcode_len);
+	llvm::Module *M = llvm::unwrap(mod);
+	const llvm::NamedMDNode *kernel_node
+				= M->getNamedMetadata("opencl.kernels");
+	unsigned kernel_count = kernel_node->getNumOperands();
+	delete M;
+	return kernel_count;
+}
+
+extern "C" LLVMModuleRef llvm_get_kernel_module(unsigned index,
+		const unsigned char *bitcode, unsigned bitcode_len)
+{
+	LLVMModuleRef mod = llvm_parse_bitcode(bitcode, bitcode_len);
+	llvm::Module *M = llvm::unwrap(mod);
+	const llvm::NamedMDNode *kernel_node =
+				M->getNamedMetadata("opencl.kernels");
+	const char* kernel_name = kernel_node->getOperand(index)->
+					getOperand(0)->getName().data();
+	llvm_strip_unused_kernels(mod, kernel_name);
+	return mod;
+}