> Hmm - but how can you call this ambiguous? VLEN and LMUL is a runtime > property(?), so unknown to the compiler(?) - as you do below the only > way to code generate would be a agnostic way such as with a slide-down. > But can't you always to this, for all subregs of this sort (even with offset)?
LMUL (register group size) is a compile-time constant while VLEN is not. Once we have VLS modes that span more than the minimum runtime size of a vector it's ambiguous whether the mode occupies two minimum-size vectors or one dynamically larger one. Did you mean the agnostic way should just be the default expansion for each such subreg? Regards Robin
