forked from OSchip/llvm-project
38 lines
1.3 KiB
Markdown
38 lines
1.3 KiB
Markdown
The EmitC dialect allows to convert operations from other MLIR dialects to EmitC
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ops. Those can be translated to C/C++ via the Cpp emitter.
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The following convention is followed:
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* If template arguments are passed to an `emitc.call` operation, C++ is
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generated.
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* If tensors are used, C++ is generated.
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* If multiple return values are used within in a functions or an `emitc.call`
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operation, C++11 is required.
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* If floating-point type template arguments are passed to an `emitc.call`
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operation, C++20 is required.
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* Else the generated code is compatible with C99.
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These restrictions are neither inherent to the EmitC dialect itself nor to the
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Cpp emitter and therefore need to be considered while implementing conversions.
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After the conversion, C/C++ code can be emitted with `mlir-translate`. The tool
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supports translating MLIR to C/C++ by passing `-mlir-to-cpp`. Furthermore, code
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with variables declared at top can be generated by passing the additional
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argument `-declare-variables-at-top`.
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Besides operations part of the EmitC dialect, the Cpp targets supports
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translating the following operations:
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* 'std' Dialect
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* `std.br`
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* `std.call`
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* `std.cond_br`
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* `std.constant`
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* `std.return`
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* 'scf' Dialect
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* `scf.for`
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* `scf.if`
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* `scf.yield`
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* 'arith' Dialect
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* 'arith.constant'
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