[PATCH] [llgo] irgen: generate switch instructions

[Peter Collingbourne]

I wonder if there is a way to do this without modifying the go/ssa IR. In particular, I don't feel very comfortable about any attempt to define an instruction outside the ssa package. Maybe we can build a mapping to keep track of which ssa.If instructions are to be treated as switch instructions?

I believe LLVM already has a transformation to convert chains of branch instructions into switches, at least in some cases. Have you measured a performance improvement with this change at all? (Asking just out of curiosity. I think it would be worth exploring the performance impact of extending this to support type switches, so I have no objection to this change in principle.)


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http://reviews.llvm.org/D6831

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