c4fd1fd6d4
This renames the `emitc.call` op to `emitc.call_opaque` as the existing call op does not refer to the callee by symbol. The rename allows to introduce a new call op alongside with a future `emitc.func` op to model and facilitate functions and function calls.
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The EmitC dialect allows to convert operations from other MLIR dialects to EmitC ops. Those can be translated to C/C++ via the Cpp emitter.
The following convention is followed:
- If template arguments are passed to an
emitc.call_opaqueoperation, C++ is generated. - If tensors are used, C++ is generated.
- If multiple return values are used within in a functions or an
emitc.call_opaqueoperation, C++11 is required. - If floating-point type template arguments are passed to an
emitc.call_opaqueoperation, C++20 is required. - Else the generated code is compatible with C99.
These restrictions are neither inherent to the EmitC dialect itself nor to the Cpp emitter and therefore need to be considered while implementing conversions.
After the conversion, C/C++ code can be emitted with mlir-translate. The tool
supports translating MLIR to C/C++ by passing -mlir-to-cpp. Furthermore, code
with variables declared at top can be generated by passing the additional
argument -declare-variables-at-top.
Besides operations part of the EmitC dialect, the Cpp targets supports translating the following operations:
- 'cf' Dialect
cf.brcf.cond_br
- 'func' Dialect
func.callfunc.constantfunc.funcfunc.return
- 'arith' Dialect
arith.constant