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Lsra heuristic tuning experiment report#56103

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kunalspathak merged 3 commits intodotnet:mainfrom
kunalspathak:lsra-tuning
Jul 21, 2021
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Lsra heuristic tuning experiment report#56103
kunalspathak merged 3 commits intodotnet:mainfrom
kunalspathak:lsra-tuning

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Here is the draft that explains the background, motivation, experiments and outcome of LSRA heuristic tuning experiment.

Fixes #55376
Contributes to #43318

@ghost ghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Jul 21, 2021
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@stephentoub stephentoub left a comment

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Great write-up. Thanks.

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@BruceForstall BruceForstall left a comment

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Thanks for writing this down.

It appears, but I think is not explicitly stated, that we didn't change the heuristic or heuristic ordering as a result of this experiment. Would it be reasonable to add some comment at the end to the effect of:

"We decided not to change any heuristic ordering at the current time as a result of this experiment. Instead, we will focus on fixing known LSRA issues as stated. After other LSRA weaknesses are addressed, we can choose to return to this experiment and use the techniques, tools, and knowledge here to inform a heuristic re-ordering."

?

@kunalspathak kunalspathak merged commit b2264cb into dotnet:main Jul 21, 2021
@ghost ghost locked as resolved and limited conversation to collaborators Aug 21, 2021
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Register selection heuristic tuning experiments report

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