On Fri, 11 May 2018 19:22:22 +0200, Bernd Oppolzer <bernd.oppol...@t-online.de> wrote:
>What I found most interesting in this whole thread was a suggestion >from (IIRC) a SAS guy some days before. He suggested, if I understood >it correctly, that a large application should run in AM64, but store >internally >only 32 bit pointers; the left half of all registers used as address >registers >containing the same (nonzero) value all the time ... as long as the >current >"continent" (defined by this nonzero value in the left half) is not exited. > >This could be a pattern for compiler writers, too, IMO, and has some >implications: Note that he achieved this by allocating 4 GiB above the 4 GiB bar, in order to get 2 GiB. While this technique certainly has its merits, it would be easier to write the compiler if IBM simply provided an IARV64 GETSTOR USE2GBTO4GB. Although that wouldn't guarantee a full 2 GiB like he was able to get with his technique. >As you might probably know, I am the maintainer of the New Stanford >Pascal compiler; if I ever reach the point where generating 64 bit code >gets interesting, I will think more about this option. If you're generating 64-bit code you may as well just use 64-bit pointers and produce a pure 64-bit application? BFN. Paul. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
