PNEXT

Find next active predicate

An instruction used to construct a loop which iterates over all true elements in the vector select predicate register. If all elements in the first source predicate register are false it determines the first true element in the vector select predicate register, otherwise it determines the next true element in the vector select predicate register that follows the last true element in the first source predicate register. All elements of the destination predicate register are set to false, except the element corresponding to the determined vector select element, if any, which is set to true. Sets the First (N), None (Z), !Last (C) condition flags based on the predicate result, and the V flag to zero.

if !HaveSVE() && !HaveSME() then UNDEFINED; constant integer esize = 8 << UInt(size); integer v = UInt(Pv); integer dn = UInt(Pdn);