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* [Bug tree-optimization/111110] New: (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it @ 2023-08-23 5:05 pinskia at gcc dot gnu.org 2023-08-23 5:06 ` [Bug tree-optimization/111110] " pinskia at gcc dot gnu.org 2023-08-23 23:16 ` pinskia at gcc dot gnu.org 0 siblings, 2 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-23 5:05 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111110 Bug ID: 111110 Summary: (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: enhancement Priority: P3 Component: tree-optimization Assignee: pinskia at gcc dot gnu.org Reporter: pinskia at gcc dot gnu.org Target Milestone: --- (simplify (ne (cmp@2 @0 @1) integer_zerop) (if (types_match (type, TREE_TYPE (@2))) (cmp @0 @1))) (simplify (eq (cmp@2 @0 @1) integer_truep) (if (types_match (type, TREE_TYPE (@2))) (cmp @0 @1))) Those (cmp @0 @1) results really should just be @2 .... ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/111110] (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it 2023-08-23 5:05 [Bug tree-optimization/111110] New: (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it pinskia at gcc dot gnu.org @ 2023-08-23 5:06 ` pinskia at gcc dot gnu.org 2023-08-23 23:16 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-23 5:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111110 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2023-08-23 Status|UNCONFIRMED |ASSIGNED --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Mine. Will test it in the next few days. I had noticed some extra comparison expressions being made and I wonder if this was the cause ... ^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/111110] (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it 2023-08-23 5:05 [Bug tree-optimization/111110] New: (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it pinskia at gcc dot gnu.org 2023-08-23 5:06 ` [Bug tree-optimization/111110] " pinskia at gcc dot gnu.org @ 2023-08-23 23:16 ` pinskia at gcc dot gnu.org 1 sibling, 0 replies; 3+ messages in thread From: pinskia at gcc dot gnu.org @ 2023-08-23 23:16 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111110 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |WONTFIX --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- So this won't work even though it is the right thing to do because when we are folding `if (a != 1)` and a is defined by a comparison, we want to get back the comparison. Now you could say this is problem in how we fold GIMPLE_COND but it is what it is right now. ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-08-23 23:16 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2023-08-23 5:05 [Bug tree-optimization/111110] New: (A CMP B) != 0 and (A CMP B) == true patterns produce an extra (A CMP B) rather than reusing it pinskia at gcc dot gnu.org 2023-08-23 5:06 ` [Bug tree-optimization/111110] " pinskia at gcc dot gnu.org 2023-08-23 23:16 ` pinskia at gcc dot gnu.org
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