Plans for Linux ELF "i686+" ABI ? Like SPARC V8+ ?

[tim prince]

Richard Guenther wrote:
>
> The idea is not exactly new, the main complication is that it would need
> hacking both the gcc (and glibc) side and the kernel syscall interface.  The
> 32bit compatibility entries cannot be used if you want to align long long and
> double naturally (which you certainly want, for performance reasons).
>
>   
What does this mean?  In 32-bit linux gcc, as currently set up, double 
alignment may be disabled by setting -Os or by 
-mpreferred-stack-boundary, but otherwise it is the default.  The 64-bit 
int registers aren't available in 32-bit mode.  Are you proposing a 
64-bit mode with the same alignments as -Os sets in 32-bit mode?