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Hey Tim, thanks for the quick answer, this looks exactly like what I was trying to achieve, I was hoping there was something more clean, I was wondering how the community would accept a change in the TD, if the code at CallinvConvLower.cpp:138 would've passed the IsFixed flag to the AssignFn then all those workarounds wouldn't be needed, this example is only one of a few I can think of for

I haven't dug into the GlobalISel calling convention code much but I can comment on the MipsCCState. > On 3 Jan 2018, at 14:00, Alex Bradbury via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > This question came about through reviewing work from Leslie Zhai on GlobalISel > support for RISC-V, which also motivated me to revisit code which I've always > felt was a

This question came about through reviewing work from Leslie Zhai on GlobalISel support for RISC-V, which also motivated me to revisit code which I've always felt was a bit clunky. Calling convention lowering in LLVM is typically handled by functions conforming to the CCAssignFn typedef: typedef bool CCAssignFn(unsigned ValNo, MVT ValVT, MVT LocVT,