[llvm-dev] RTLIB and Custom Library calls

Miguel Inigo J. Manalac via llvm-dev llvm-dev at lists.llvm.org
Sun Mar 1 23:33:34 PST 2020

Hello LLVM-Dev,

Most of the processing for i64 and f64 types for our backend are emulation library calls. Some of the library calls are not defined in the RuntimeLibcalls.def Libcall enum so we have to define custom library calls.

How is the ideal way of implementing the custom library calls? Providing us with a target backend having a similar functionality would also help us significantly.
Say for a i64 type compare, does adding it in the RuntimeLibcalls.def enum, SelectionDAGLegalize::ConvertNodeToLibcall function, and the target ISelLowering Class solve our problem?
Is it okay to modify RuntimeLibcalls.def and SelectionDAGLegalize::ConvertNodeToLibcall function?
A starting point for processing lib calls other than the ISelLowering class would also help!

Thank you in advance for your help!

Miguel Inigo J. Manalac (1852)

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