|Version 4 (modified by nomeata, 18 months ago) (diff)|
This is nomeata’s notepad about the nested CPR information:
- #1600 Main tickets where I mention progress.
Tickets with stuff that would make nested CPR better:
- #8598 CPR after IO (partly done)
- Everything in source:testsuite/tests/stranal/sigs/
- Does Nick Frisby’s late λ-lifting alliviate problems when CPR’ing join-points?
- Paper-Writeup of CPR
- Shouldn’t nested CPR help a lot with Complex-heavy code? Is there something in nofib?
- Try passing CPR information from the scrunitee to the pattern variables. For that: Reverse flow of analysis for complex scrunitees (for simple, we want the demand coming from the body, for complex, this is not so important.)
- Why is cacheprof not deterministic? (→ #8611)
- Use ticky-profiling to learn more about the effects of nested CPR.
- Look at DmdAnal-related [SLPJ-Tickets] and see which ones are affected by nested-cpr.
It would be nice to merge the code structure improvements and notes into master, to keep my branch short. But it is based on better-ho-cardinality, and that is not suitable for merging because of unexpected regressions even in nofib and rtak. So I am investigating.
In these tests, it is related to reading and showing data. Small example:
main = (read "10" :: Int) `seq` return ()
Baseline: 49832, better-ho-cardinality: 49968. Unfortunately, the changes to, for example, GHC.Read are not small, and probably mostly benign...
- Should runSTRep be inlined (see ticket:1600#comment:34)?