The closet instruction is HLASM has for what Gil asked is CNOP - updated a couple of years ago by apar PI17455 - but you do need to know what your cache lines are. see http://www.ibm.com/support/docview.wss?uid=isg1PI17455 and http://www.ibm.com/support/docview.wss?uid=swg21687009 Where the OPTABLE value is not one of DOS, 370 or XA, the CNOP generated no-operation instructions are BRC or BRCL instructions. Sharuff
IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on 24/11/2016 00:50:16: > From: Paul Gilmartin <00000014e0e4a59b-dmarc-requ...@listserv.uga.edu> > To: ASSEMBLER-LIST@LISTSERV.UGA.EDU > Date: 24/11/2016 00:50 > Subject: Re: Rif: Re: EXECUTE Instruction and location of its target > instruction > Sent by: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> > > On 2016-11-23 07:19, aldo.cro...@csebo.it wrote: > > I think it is appropriate to use a EXRL (execute remote) intest a EX. > > I also think that it is appropriate to place the subject of education > > execute close to the EX, preferably after a statement of unconditional > > branch. > > > Is it recommended for legibility/maintainability that the subject appear > adjacent to the EX rather than after a nearby unrelated branch? > > What effect does an unconditional branch have on branch prediction/pipelining? > http://www.wrenvironmental.com/commercial/services/pipelining/ > > Is LOCTR a help? I can imagine the frustration of a programmer trying to > correlate a dump with a listing where the author has used LOCTR heavily > and wishing that HLASM had an option to generate SYSPRINT in address order > rather than in source order. > > Does HLASM have an instruction to cause cache line alignment? Such an > instruction would need to be model-sensitive, perhaps governed by OPTABLE. > > -- gil > Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU
