CLASTB (scalar)

Conditionally extract last element to general-purpose register

From the source vector register extract the last active element, and then zero-extend that element to destructively place in the destination and first source general-purpose register. If there are no active elements then destructively zero-extend the least significant element-size bits of the destination and first source general-purpose register.

if !HaveSVE() && !HaveSME() then UNDEFINED; constant integer esize = 8 << UInt(size); integer g = UInt(Pg); integer dn = UInt(Rdn); integer m = UInt(Zm); constant integer csize = if esize < 64 then 32 else 64; boolean isBefore = TRUE;