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...fact permit an [immediate-specified] vscale to be set, arbitrarily, > at any time. Maybe I'm missing something here, but if SV uses an immediate to define vscale, that implies the value of vscale is known at compile-time and thus regular (fixed-width) vector types can be used? > now, we mmmiiiight be able to get away with assuming that vscale is > equal to the absolute maximum possible setting (64 for RV64, 32 for > RV32), then use / play-with the "runtime active VL get/set" > intrinsics. > > i'm kiinda wary of saying "absolutely yes that's the way forw...

Thanks @Robin and @Graham for giving some background on scalable vectors and clarifying some of the details! Apologies if I'm repeating things here, but it is probably good to emphasize the conceptually different, but complementary models for scalable vectors: 1. Vectors of unknown, but constant size throughout the program. 2. Vectors of changing size throughout the program. Where (2)