https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
Segher Boessenkool changed:
What|Removed |Added
Status|ASSIGNED|RESOLVED
Resolution|---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #9 from Segher Boessenkool ---
Author: segher
Date: Tue Sep 18 16:24:58 2018
New Revision: 264401
URL: https://gcc.gnu.org/viewcvs?rev=264401=gcc=rev
Log:
Backport PR86882 fix to 8
PR rtl-optimization/86882
*
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #8 from Segher Boessenkool ---
Author: segher
Date: Tue Sep 18 16:19:56 2018
New Revision: 264400
URL: https://gcc.gnu.org/viewcvs?rev=264400=gcc=rev
Log:
Handle CLOBBER in reg_overlap_mentioned_p (PR86882)
Combine will put CLOBBER
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
Segher Boessenkool changed:
What|Removed |Added
Status|NEW |ASSIGNED
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #6 from Uroš Bizjak ---
(In reply to Segher Boessenkool from comment #5)
> So what is wrong about that? CONST_INTs are sign-extended always, so
> 0xff00 is just fine?
As said in Comment #2, it is not wrong, just
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #5 from Segher Boessenkool ---
So what is wrong about that? CONST_INTs are sign-extended always, so
0xff00 is just fine?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #4 from Uroš Bizjak ---
(In reply to Segher Boessenkool from comment #3)
> combine creates a clobber of const_int 0 to make sure a pattern will
> not match. That is valid RTL, but further patterns constructed from
> that are not
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #3 from Segher Boessenkool ---
combine creates a clobber of const_int 0 to make sure a pattern will
not match. That is valid RTL, but further patterns constructed from
that are not (clobber on a rhs).
The upper bits of a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
--- Comment #2 from Uroš Bizjak ---
Also suspicious combine transformation before the failure:
Trying 10, 11 -> 13:
10: r94:SI=zero_extend(r92:QI)
11: {r95:SI=r94:SI^0x101;clobber flags:CC;}
REG_DEAD r94:SI
REG_UNUSED flags:CC
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86882
Uroš Bizjak changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed|
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