https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65752
Tavian Barnes <tavianator at gmail dot com> changed:
What |Removed |Added
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CC| |tavianator at gmail dot com
--- Comment #61 from Tavian Barnes <tavianator at gmail dot com> ---
(In reply to rguent...@suse.de from comment #44)
> The other (unfortunate) thing is that in GCC pointer subtraction
> is always performed on integers, thus for the C source code
>
> int idx = ptr1 - ptr2;
>
> we internally have sth like
>
> int idx = ((long)ptr1 - (long)ptr2) / 4;
>
> so you can't really treat pointers as "escaped" here without loss.
It seems possible to distinguish between ptr-to-int casts that actually occur
in the source, from ptr-to-int casts that are generated for other reasons by
the compiler.
