Take this with 2 cents since I'm not versed explicitly in Zen architecture, but it's likely only the SP. Usage patterns are fairly easy to deduce at compile tim

Take this with 2 cents since I'm not versed explicitly in Zen architecture, but it's likely only the SP. Usage patterns are fairly easy to deduce at compile time and are optimized, i.e. loop tiling, thus I think it's fair to assume the optimizations are leveraged against this. For example, if you can predict the loop pattern you can repurpose the SP.