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...s isn't a comprehensive list of all shuffles we might want, but it's a reasonable starting point. The way the proposal is written, it should be easy to extend if we add more shuffles. Proposed IR syntax: %result = shufflevector <vscale x 4 x i32> %v1, <vscale x 4 x i32> %v2, SHUFFLE_NAME SHUFFLE_NAME can be one of the following (with examples of the equivalent <4 x i32> shuffles): splat - Splat element 0 of the first operand. (<0, 0, 0, 0>) reverse - Reverse the elements of the first operand (<3, 2, 1, 0>) concat - Concatenate the two operands (<0, 1, 2, 3, 4...

..., and that isn't > enough to express a scalable operation. For example, concatenating two > fixed-length vectors currently looks like this: > > > > Proposed IR syntax: > > > > %result = shufflevector <vscale x 4 x i32> %v1, <vscale x 4 x i32> %v2, > SHUFFLE_NAME > > > > Alternatives: > > > > Instead of extending shufflevector, we could introduce a dedicated > intrinsic for each common shuffle. This is less readable, and makes it harder > to leverage existing code that reasons about shuffles. But it would mean > fewer cha...