SAM64, SAM31 and SAM24 are relatively slow instructions. Are you shifting between addressing modes only when you have to? If you clear the 64-bit registers and set up the base registers you can probably do a single SAM64 and leave it in that mode. Yes, you will have to shift to AMODE 31 to do certain system functions, but just try to minimize the shifts.
Chris Blaicher Technical Architect Software Development Syncsort Incorporated 50 Tice Boulevard, Woodcliff Lake, NJ 07677 P: 201-930-8234 | M: 512-627-3803 E: [email protected] -----Original Message----- From: IBM Mainframe Assembler List [mailto:[email protected]] On Behalf Of Brite Sent: Tuesday, May 05, 2015 10:48 AM To: MVS List Server 2 Subject: Re: LNKEDT 64-bit mode assembler in AMODE 31 Thanks everyone for all the helpful info. The program does use SAM64 to switch to AMODE(64) before issuing IARV64 to get storage above 2GB. And use SAM31 to switch back. So the attribute of load module after LNKEDT really doesn't matter. Is this correct? The program also use SYSSTATE AMODE64=YES at the beginning. Will this also override the AMODE of the load module?
