Better end of loop counter optimisation
Registered by
Michael Hope
GCC can calculate the final value of a loop counter and use that in later optimisations. The value is calculated in the original signed type which, due to overflow rules, can lead to a strange looking value which is not supported and reduced by later optimisations.
Improve either through reducing the calculated value or implementing or improving later passes.
Blueprint information
- Status:
- Complete
- Approver:
- Michael Hope
- Priority:
- High
- Drafter:
- Michael Hope
- Direction:
- Approved
- Assignee:
- Kugan Vivekanandarajah
- Definition:
- Approved
- Series goal:
- Accepted for 4.7
- Implementation:
-
Informational
- Milestone target:
-
backlog
- Started by
- Michael Hope
- Completed by
- Matthew Gretton-Dann
Related branches
Related bugs
Sprints
Whiteboard
[2013-05-21 matthew-
Status: upstream wants a different implementation. Parked.
Do as a plus/minus reassociation pass.
(?)
