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But I suppose >> AVX10/128 is too theoretical to be true. I will make it a boolean for now. > > Right, a boolean is fine initially, but with the spec explicitly allowing > the 128-bits-only mode, I'm pretty sure we ought to support that rather > sooner than later. After all, more artificial environments (emulators, > virtualization) may expose feature combinations not ever seen on real > hardware. Actually, making it a boolean isn't nice, because a boolean would be named differently than a numeric field. So I think it wants to be numeric, but with only 0 and one other value permitted for now. Jan