**T**he **a**xpy **s**cale(s) (or **T**emporary **a**mp **s**torage).
The scalar value(s) used by the various \*axp(b)y and \*raxb
instructions (`f32v2axpy`, `f16v4mix` for example), (or temporary
storage for `f32sisoamp`, `f32sisoslic`,f16v8topk-instr-defn
andf32v4topk-instr-defn)

## Note

The value of this register is *undefined* at worker launch