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This would likely require a new predicate >> (bcst_intvec_operand()?) and a new constraint (BR? Bi?). (Yet for name >> selection it will want considering that this is applicable to certain >> non-calculational FP operations as well.) > I think so. Any preference towards predicate and constraint naming? Plus I think there's a more general question behind this: A new predicate / constraint pair is likely just one way of dealing with the issue. Another would appear to be to remove the restriction of 128- and 256-byte types when AVX512VL is not enabled, but AVX512F is. While that would require touching a lot of insn constraints, it looks as if lifting that restriction would "merely" require much wider use of Yv where v is used right now. But of course I may well be unaware of (some of) the reasons why that restriction was put in place in the first place (it can't really be the lack of suitable move insns, as those can be synthesized by using e.g. vextract{32,64}x4). Jan