My point was just that overflow-ignore is a feature of the hardware, possibly explaining the origins of assembler overflow-ignore.
As a security guy I can think of a reason a bad guy might code it this way: to defeat security scanning software that might be looking for load base-displacements of X'0010'. Charles -----Original Message----- From: IBM Mainframe Assembler List [mailto:ASSEMBLER-LIST@LISTSERV.UGA.EDU] On Behalf Of Paul Gilmartin Sent: Monday, March 6, 2017 9:11 AM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: HLASM anomaly On 2017-03-06, at 10:01, Charles Mills wrote: > A detail, right? In AMODE 64 I could load X'FFFFFFFFFFFFFFF0' into R1, ... > You could, but that's not the example I gave. And you can't code the USING. I'm disputing the operation not of the hardware but of the USING instruction. I don't know why a programmer, in AMODE 31, would access the CVT by: USING X'7FFFFFF0',R1 L R2,X'80000020' in order to access the CVT, which works in HLASM but not in DASM (yesterday). Well, I suppose in a bizarre circumstance it saves a precious base register. -- gil
