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> On Nov 13, 2020, at 15:11, Krzysztof Parzyszek via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Examples of complex instructions? Hexagon has a cmpy instruction for complex multiplication, although it works on int16-based values. There is a whole set of these instructions (with various saturation/rounding behaviors), but each one of them can multiply two complex numbers

...to do such lowering. "Normal" LLVM instructions with a first-class complex type is similarly lowerable. I'm not necessarily opposed to intrinsics (especially if we have Simon's generic matchers available) but I think it's important to be clear what we're talking about. Intrtinaics vs. first-class complex types have different tradeoffs. With Simon's generic matchers those trade-offs are less stark to me though. -David