Hi all, As you all know that we are continuously working on new ISA implementation for i386 backend.
There is one thing that I am really curious about when I read the code. In gcc/config/i386/i386-cpuinfo.h, we have such comment: /* ISA Features supported. New features have to be inserted at the end. */ Why new features have to be inserted at the end? I did a quick investigation and found that it was added at this mailing thread originally at libgcc/config/i386/cpuinfo.c: https://gcc.gnu.org/pipermail/gcc-patches/2015-September/428915.html In the thread, it seems that it might cause unwanted ABI change. Could anyone kindly tell me something more about that? Should this rule still be kept for now after about eight years since then? Thx, Haochen
