Investigate LRA in GCC for ARM
LRA is a proposed replacement to reload in GCC. We should investigate whether it actually provides a benefit to x86 and x86_64, and if it does then work out what benefit turning it on will give to ARM, and the steps needed to turn it on.
Blueprint information
- Status:
- Complete
- Approver:
- Michael Hope
- Priority:
- High
- Drafter:
- Matthew Gretton-Dann
- Direction:
- Approved
- Assignee:
- Brice Dobry
- Definition:
- Approved
- Series goal:
- Accepted for 4.7
- Implementation:
- Informational
- Milestone target:
- backlog
- Started by
- Matthew Gretton-Dann
- Completed by
- Matthew Gretton-Dann
Related branches
Related bugs
Sprints
Whiteboard
[matthew-
Meta:
Headline: Investigate GCC's new LRA infrastructure and examine potential benefit for ARM
Acceptance: Report on LRA's benefits
Roadmap id: CARD-304
Work Items
Work items:
Benchmark x86 reload vs LRA: DONE
Benchmark x86_64 reload vs LRA: POSTPONED
Study LRA changes: DONE
Bootstrap toolchain from last working revision of "lra" branch for ARM: DONE
Resolve ICE when building eglibc for above: DONE
Bootstrap toolchain from HEAD of "lra" branch for ARM: DONE
Resolve ICE when building libgcc for above: DONE
Benchmark ARM reload vs. LRA: INPROGRESS
Add target hooks for improved LRA on ARM: INPROGRESS
Benchmark ARM reload vs. optimized LRA: TODO
Merge lra branch with linaro trunk for testing: INPROGRESS
Dependency tree
* Blueprints in grey have been implemented.