notes.md

In duncantl/R2llvm: LLVM-based compiler for R code

Vince's Notes

Casting in Comparison Operators

inst/examples/ifAssign.R's foo (and my foo.alt which compiles at this state) illustrates a problem - the module will fail to build if Int32Type and DoubleTypes are compared. This is because there are type-specific comparison operators in LLVM, i.e. FCmp.

Documentation Needed

• .functionInfo
• .routineInfo
• .compilerHandlers
• .insertReturn internals - how this works, what nested is, etc.

Questions/Ideas:

• getMathOpType current looks to see if types are common and if not, returns a DoubleType, the type that we should coerce to. Could this be made more generic such that it does the conversion for us?

• fixIfAssign needs type checking - possible best done by scanning the body of the assignment first?

Stuff I broke or disabled intentionally

• .InsertReturn is commented out and not TRUE by default in compileFunction because it's broken.
• fixIfAssign is commented out because it's broken.

duncantl/R2llvm documentation built on May 14, 2019, 9:42 a.m.