https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
Jeffrey A. Law changed:
What|Removed |Added
Status|NEW |RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
--- Comment #7 from CVS Commits ---
The master branch has been updated by Jeff Law :
https://gcc.gnu.org/g:2e886eef7f2b5aadb00171af868f0895b647c3a4
commit r13-4907-g2e886eef7f2b5aadb00171af868f0895b647c3a4
Author: Raphael Moreira Zinsly
Date:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
Andrew Pinski changed:
What|Removed |Added
Severity|normal |enhancement
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
--- Comment #6 from Uroš Bizjak ---
(In reply to Uroš Bizjak from comment #5)
> (In reply to Mel Chen from comment #2)
> > Is it possible to pretend that we have a pattern that can match xor (reg:SI
> > 80), (reg: SI 72), 0xa001 in combine pass?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
--- Comment #5 from Uroš Bizjak ---
(In reply to Mel Chen from comment #2)
> Is it possible to pretend that we have a pattern that can match xor (reg:SI
> 80), (reg: SI 72), 0xa001 in combine pass?
> And then, if the constant part is too large to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
--- Comment #4 from Jim Wilson ---
Created attachment 48737
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48737&action=edit
proof of concept patch for changing xor with a large constant
needs cleanup and testing to be useful
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
--- Comment #3 from Jim Wilson ---
It isn't possible to have patterns that match only in combine. If we add a
pattern to accept (xor (reg) (large constant)) then it could match in any
optimization pass, and could prevent us from optimizing away
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
--- Comment #2 from Mel Chen ---
(In reply to Jim Wilson from comment #1)
> We sign extend HImode constants as that is the natural thing to do to make
> arithmetic work. This does mean that unsigned short logical operations need
> a zero extend
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95632
Jim Wilson changed:
What|Removed |Added
Last reconfirmed||2020-06-12
Status|UNCONFIRMED
