Wow! Charles
-----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Ed Jaffe Sent: Wednesday, May 04, 2016 2:08 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: How expensive is AMODE switching? On 5/4/2016 1:49 PM, Jerry Callen wrote: > Before I sit down and write a test program to time it, can anyone tell me how > expensive the AMODE switching instructions are (SAM31/SAM64)? Our zHISR benchmark averages the time required to switch from 31-bit mode to 64-bit mode and back again, back-to-back. (It does not time the case where the target mode is the same as the current mode.) The result here suggests that a 'SAMnn' instruction is approximately equal to 34 'L' instructions on a z13s. YMMV. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
