On Mon, 3 Dec 2007 15:46:59 -0600, Ernest Nachtigall <[EMAIL PROTECTED]> wrote:
Thank you very much for joining the discussion. I'm afaid you're going to be swamped with questions for a while. >... Fo CPACF, is is a single OP code so beats >software routines thousands to one (TDES ASM routine has thousands of >instructions). >... I understand that the CPACF instructions are just that - single instructions. But so are AR, MVCL, and CFC - quite a range. (I'm guessing that CFC takes a long time to execute. It's description takes a long time to read!). I'm guessing that the CPACF instructions are implemented in millicode and may not execute quite as fast, and represent quite as light a load on the CP, as AR (for example). One of the people here suggested that enabling the feature did nothing more than enabled instruction decode - that the cycles burned were about the same - hardware or software. I would like to refute that if the appropriate doc exists. Pat O'Keefe ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
