I'm pretty sure that a loop wouldn't put more of a load on the D-cache than a single instruction.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Paul Gilmartin <0000042bfe9c879d-dmarc-requ...@listserv.ua.edu> Sent: Tuesday, October 22, 2024 7:21 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: Bounded string move? Caution: This email did not originate from George Mason’s mail system. Do not click links or open attachments unless you recognize the sender and know the content is safe. On Mon, 21 Oct 2024 23:28:13 +0000, Seymour J Metz wrote: >If I know the lengths of an input string and the length of a buffer, I can >specify a pad character and copy it with MVCL. If I know that it is delimited >by, e.g., a blank, I can use MVST but I run the risk of a buffer overrun. Is >there a quick way to copy a delimited string without overrunning either the >input or output buffer and without resorting to TRT? > Might one expect the first instruction of a multi-instruction solution to load the string into cache making following access to the data almost zero-cost (except for I-fetch)? -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
