VMS Help MACRO, VAX MACRO Assembler, Instructions, CMPx  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Purpose:        Arithmetic comparison between two scalar quantities
    Format:         opcode scr1.rx,src2.rx
    Operation:      src1 - src2
    C. Codes:       N = {src1 LSS src2}, Z = {src1 EQL src2},
                    V = 0, C = {src1 LSSU src2} (integer),
                    C = 0 (floating)
    Exceptions:     None (integer), reserved operand (floating)
    Opcodes:        91    CMPB     Compare byte
                    B1    CMPW     Compare word
                    D1    CMPL     Compare long
                    51    CMPF     Compare F_floating
                    71    CMPD     Compare D_floating
                    51FD  CMPG     Compare G_floating
                    71FD  CMPH     Compare H_floating
    Description:    src1 is compared with src2. The only action is to
                    affect the condition codes.