https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240
--- Comment #19 from Jakub Jelinek ---
Author: jakub
Date: Thu Jan 18 08:29:14 2018
New Revision: 256838
URL: https://gcc.gnu.org/viewcvs?rev=256838=gcc=rev
Log:
PR c/61240
* match.pd ((P + A) - P, P - (P + A), (P + A) - (P +
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240
--- Comment #18 from Marc Glisse ---
(In reply to Jakub Jelinek from comment #17)
> Created attachment 43162 [details]
> gcc8-pr61240.patch
>
> The C FE doesn't do this optimization anymore, but c_fully_fold does because
> the generic folding
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240
--- Comment #17 from Jakub Jelinek ---
Created attachment 43162
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43162=edit
gcc8-pr61240.patch
The C FE doesn't do this optimization anymore, but c_fully_fold does because
the generic folding
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240
--- Comment #16 from Jakub Jelinek ---
It is a regression, so it isn't too late yet.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240
--- Comment #15 from Marek Polacek ---
I've been meaning to address this PR (for too long, apparently), but it seems
it's too late for GCC 8 now. If you want, you can take it. If not, hopefully
I'll get to it for GCC 9.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61240
--- Comment #14 from Jakub Jelinek ---
Marek, are you still on the hook to remove this premature optimization from the
FE and let it be folded in c_fully_fold or later?
