MVC has another exemption. The entire 256 bytes appear to move at once. Vs MVCL appears to move 1 byte at a time with register updates.
On Fri, Jul 26, 2024 at 3:47 PM Paul Gilmartin <[email protected]> wrote: > > On Fri, 26 Jul 2024 15:30:31 -0400, Tony Harminc wrote: > > > >No - MVC has a specific exemption ("When the operands overlap, the result > >is obtained as if the operands were processed one byte at a time and each > >result byte were stored immediately after fetching the necessary operand > >byte.") from the general destructive overlap rule, and MVCDK doesn't. > > > To what is that an "exemption"? If the operands do not overlap, may it > appear not to perform the move bytewise? Can a program detect that? > > -- > gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
