PFALSE Set all predicate elements to false This instruction sets all elements in the destination predicate to false. For programmer convenience, an assembler must also accept predicate-as-counter register name for the destination predicate register. False 0 0 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1 1 1 0 0 1 0 0 0 0 0 0 PFALSE <Pd>.B if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let d : integer = UInt(Pd); <Pd> Is the name of the destination scalable predicate register, encoded in the "Pd" field. CheckSVEEnabled(); let VL : integer{} = CurrentVL(); let PL : integer{} = VL DIV 8; P{PL}(d) = Zeros{PL}; 2026-03-12 12:23:09 2025-09_rel_asl1