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In 039d455, we changed cmd/compile to avoid using DUFFZERO and other FP-based frame zeroing methods, because they're not permitted within note handlers.
I think this is overly conservative. It should still be safe to use DUFFZERO on plan9 when we're compiling non-runtime packages, because functions from those packages will never be called by sigtramp. This is probably as simple as changing
Just pointing out since I was looking at related code. Will let some of the plan9 folks decide if this is worth pursuing.