David Crayford suggests that the pother to which I objected is perhaps: | Because it's not done in the hardware to make it self-documenting?
which raises the question what he means by self-documenting. Machine instructions are not self-documenting. If z/Architecture instructions were self-documenting we should be able to dispense with the PrOp, which all of us in fact find indispensable. XOR is 'documented' by a simple four-row truth table, and anyone who cannot reproduce that truth table upon demand should not be a programmer. John Gilmore, Ashland, MA 01721 - USA ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
