SMAX (register) Signed maximum (register) This instruction determines the signed maximum of the two source register values and writes the result to the destination register. This instruction is a data-independent-time instruction as described in About PSTATE.DIT. 0 0 1 1 0 1 0 1 1 0 0 1 1 0 0 0 0 SMAX <Wd>, <Wn>, <Wm> 1 SMAX <Xd>, <Xn>, <Xm> if !IsFeatureImplemented(FEAT_CSSC) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let datasize : integer{} = 32 << UInt(sf); <Wd> Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field. <Wn> Is the 32-bit name of the first general-purpose source register, encoded in the "Rn" field. <Wm> Is the 32-bit name of the second general-purpose source register, encoded in the "Rm" field. <Xd> Is the 64-bit name of the general-purpose destination register, encoded in the "Rd" field. <Xn> Is the 64-bit name of the first general-purpose source register, encoded in the "Rn" field. <Xm> Is the 64-bit name of the second general-purpose source register, encoded in the "Rm" field. let operand1 : bits(datasize) = X{}(n); let operand2 : bits(datasize) = X{}(m); let result : integer = Max(SInt(operand1), SInt(operand2)); X{datasize}(d) = result[datasize-1:0]; 2026-03-26 20:27:25 2026-03_rel