https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
--- Comment #14 from Jeffrey A. Law ---
Some further notes.
I was looking at what the impact would be if we just stopped recording the
problematical equivalences in CSE, both to see if the equivalences are useful
at all, and if they are, to get
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
Jeffrey A. Law changed:
What|Removed |Added
Priority|P1 |P2
--- Comment #13 from Jeffrey A. Law
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
--- Comment #11 from Jeffrey A. Law ---
So given the conflicts during IRA I can't see a way for IRA to do a better job.
Essentially the key allocno/pseudo wants hard reg 0 to avoid the spillage, but
it also conflicts with hard reg 0.
Prior to C
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
--- Comment #12 from Jeffrey A. Law ---
Slight correction. I was looking at the wrong part of the dump when I said
cse1 didn't change insn 28. It is cse1 that changes insn 28. So this is
strictly an issue with the transformations cse1 makes.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
--- Comment #10 from Vladimir Makarov ---
(In reply to Jeffrey A. Law from comment #9)
> I think that's a fair characterization. The extra copy emitted by the older
> compiler gives the allocator more freedom. With coalescing getting more
> ag
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
--- Comment #9 from Jeffrey A. Law ---
I think that's a fair characterization. The extra copy emitted by the older
compiler gives the allocator more freedom. With coalescing getting more
aggressive, the copy is gone and the allocator's freedom
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
Richard Biener changed:
What|Removed |Added
Keywords||missed-optimization, ra
Prior
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
Jeffrey A. Law changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70164
Richard Biener changed:
What|Removed |Added
CC||law at gcc dot gnu.org,
