Once upon a time IIRC there was a significant performance penalty for non-aligned operands (loading a fullword from an address not evenly divisible by four, etc.). Does that still exist for modern Z processors? (Once upon a time it didn't work at all, but that's AFH, to use an acronym I learned this week.)
I have a string that looks like halfword, char, char, ..., halfword, char, char, ... . It will be accessed millions of times per day in a system exit. Would it be better to "pack" the halfwords immediately following the chars, or halfword-align them with a slack byte where necessary? The access will be read-only if that makes a difference. I've searched the Web but many articles just repeat "common knowledge," or are from 2005. Charles ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
