George Bonser <[EMAIL PROTECTED]> writes: > If the instruction set is changed, the CPU part number should change. In other > words, future extentions should be IMPOSSIBLE. Unused opcodes should execute a > NOP or an instruction that causes the currently executing program to terminate > in a known condition ... HALT? In this way, Pentium-N code running on a > Pentium-(<N) processor does not cause harm. When an instruction set is > expanded, the processor part number should change.
Oh, yeah, duh. I thought you meant that there should not be any instructions that are not useful; i.e., every possible byte value should have a defined purpose. Now that you've explained, it makes more sense. -- Ben Pfaff <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> Senders of unsolicited commercial e-mail will receive free 32MB core files! -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word "unsubscribe" to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
