On Fri, 1 Nov 2024 at 08:59, René Jansen <rvjan...@xs4all.nl> wrote:
> Reading through the release notes (the "what's new") of the LLVM-Clang > based C/C++ compiler for z/OS I see support for 32-bit programs and > XPLINK32 linkage. Now I have to admit that I not followed all news closely > but I even have a hard time googling this. I thought there is 24-,31- and > 64-bit support on z/OS. Is this new and where can we read about this? > I don't think there's anything architecturally new here - "32-bit" is often used in the non-mainframe world as a contrast to "64-bit", and indeed even S/360 can be said to be a 32-bit architecture. It's only the way that address arithmetic and use works that uses 1 (21-bit) or 8 (24-bit) high address bits as flags. In 64-bit mode all bits are address bits, i.e. there is no 63-bit mode. More succinctly, it's "how wide are the registers", and perhaps "how big is a pointer in C"? Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
