[llvm-dev] type-inference in tblgen for instrinfo

Lawrence, Peter via llvm-dev llvm-dev at lists.llvm.org
Thu Jun 9 15:39:42 PDT 2016

If there is a design document describing the codegen backend to tblgen, and the type-inference system it uses, I would appreciate a pointer to it.

all I can find online, like "TableGen BackEnds" and "Writing an LLVM Backend",  don't go into these details, but I seem to need a deeper understanding,

For example when I add "i32:" to an internal node of pattern tree, for example  "i32:shl" in
                [(set i32:$dst   (i32:shl   i32:rs1,  i32:rs2))]
Then I get the error "expected variable name in dag operator", and a source cursor pointing to the "shl"

I am able to jump to all kinds of conclusions about the nature of this "error", but don't have any hard facts to go by.

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