https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67609

--- Comment #21 from Jeffrey A. Law <law at redhat dot com> ---
On 10/22/2015 07:40 AM, rguenth at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67609
>
> --- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
> (In reply to Jeffrey A. Law from comment #19)
>> Preserving the upper part when setting the low part would be expressed via
>> STRICT_LOW_PART.  At least that's what I'd expect to see.
>
> According to documentation this is only needed for smaller-than-word subregs:
Yea, you're probably right.  Sigh.

So going back to the original problem, for a subreg of a multi-word reg, 
why can't we simplify that down to a suitably sized reg?

Jeff

Reply via email to