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Alan.Li edited this page Apr 27, 2020 · 3 revisions

EVM target specific changes

Frontend is expected to emit 256bit values LLVM IR

The EVM architecture is the only 256-bit machine out there in the market, and so far it have not yet received support from LLVM community. We added 256-bit and 160-bit support in the LLVM IR level.

In order to utilize 256-bit and 160-bit operands, developers are expected to emit i256 and i160 data types in their IR code generation. Include the evm_llvm's header files in include/llvm folders so that these two pre-defined data types can be properly generated.

Frontend needs to generate compatible LLVM IR

Notice that development of this backend is based on LLVM 10, which is released in March 2020. We also have a LLVM 8 branch just to support those who creates their frontends in LLVM 8.

We could do back porting to other lower versions such as LLVM 9 at the request of developers for better stability or compatibility. Please let me know if you have such needs.

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