CLASTA (scalar)

Conditionally extract element after last to general-purpose register

From the source vector register extract the element after the last active element, or if the last active element is the final element extract element zero, 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 !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer g = UInt(Pg); constant integer dn = UInt(Rdn); constant integer m = UInt(Zm); constant integer csize = if esize < 64 then 32 else 64; constant boolean isBefore = FALSE;