Alex Zinenko ffc9043604 LLVM dialect conversion and target: support indirect calls ... Add support for converting MLIR `call_indirect` instructions to the LLVM IR dialect. In LLVM IR, the same instruction is used for direct and indirect calls. In the dialect, we have `llvm.call` and `llvm.call0` to work around the absence of the void type in MLIR. For direct calls, the callee is stored as instruction attribute. Use the same pair of instructions for indirect calls by omitting the callee attribute. In the MLIR to LLVM IR translator, check the presence of attribute to decide whether to construct a direct or an indirect call using different LLVM IR Builder functions. Add support for converting constants of function type to the LLVM IR dialect and for translating them to the LLVM IR proper. The `llvm.constant` operation works similarly to other types: its attribute has MLIR function type but the value it produces has LLVM IR function type wrapped in the dialect type. While lowering, look up the pointer to the converted function in the corresponding mapping. PiperOrigin-RevId: 234132351		2019-03-29 16:28:56 -07:00
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ConvertToLLVMIR.cpp	LLVM dialect conversion and target: support indirect calls	2019-03-29 16:28:56 -07:00