lkml.org 
[lkml]   [2018]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: Can we drop upstream Linux x32 support?
    Date
    * Rich Felker:

    >> If the compiler can handle the zeroing, that would be great, though not
    >> sure how (some __attribute__((zero)) which generates a type constructor
    >> for such structure; it kind of departs from what the C language offers).
    >
    > The compiler fundamentally can't. At the very least it would require
    > effective type tracking, which requires shadow memory and is even more
    > controversial than -fstrict-aliasing (because in a sense it's a
    > stronger version thereof).

    It's possible to do it with the right types. See _Bool on 32-bit Darwin
    PowerPC for an example, which is four bytes instead of the usual one.

    Similarly, we could have integer types with trap representations.
    Whether it is a good idea is a different matter, but the amount of
    compiler magic required is actually limited.

    Thanks,
    Florian

    \
     
     \ /
      Last update: 2018-12-13 17:05    [W:4.327 / U:0.764 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site