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Remove a bunch of array allocations by stephentoub · Pull Request #82041 · dotnet/runtime · GitHub
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Remove a bunch of array allocations #82041

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Merged
merged 1 commit into from
Feb 14, 2023
Merged

Remove a bunch of array allocations #82041

merged 1 commit into from
Feb 14, 2023

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@stephentoub
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A bunch of array allocations being removed by:

  • Changing static readonly arrays to be spans (taking advantage of RuntimeHelpers.CreateSpan)
  • Changing to use stackalloc
  • Changing interop to use pointers rather than arrays
  • Using ArrayPool
  • Computing a string at dev time rather than at run time
  • Lazy initializing the array when it's only needed on a fallback path
  • Deleting an array that's never used
  • Using Unsafe.AsRef to workaround Encoding not liking empty arrays

@ghost ghost assigned stephentoub Feb 13, 2023
@ghost ghost added the area-Meta label Feb 13, 2023
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ghost commented Feb 13, 2023

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Issue Details

A bunch of array allocations being removed by:

  • Changing static readonly arrays to be spans (taking advantage of RuntimeHelpers.CreateSpan)
  • Changing to use stackalloc
  • Changing interop to use pointers rather than arrays
  • Using ArrayPool
  • Computing a string at dev time rather than at run time
  • Lazy initializing the array when it's only needed on a fallback path
  • Deleting an array that's never used
  • Using Unsafe.AsRef to workaround Encoding not liking empty arrays
Author: stephentoub
Assignees: stephentoub
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area-Meta
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tannergooding
tannergooding approved these changes Feb 13, 2023
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Changes generally LGTM. Just a couple comments/nits/suggestions

@build-analysis build-analysis bot mentioned this pull request Feb 13, 2023
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@stephentoub stephentoub merged commit 5584b26 into dotnet:main Feb 14, 2023
@stephentoub stephentoub deleted the removemorearrays branch February 14, 2023 17:31
@cincuranet cincuranet mentioned this pull request Feb 16, 2023
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@ghost ghost locked as resolved and limited conversation to collaborators Mar 16, 2023
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@tannergooding tannergooding tannergooding approved these changes

@lewing lewing Awaiting requested review from lewing lewing is a code owner

@pavelsavara pavelsavara Awaiting requested review from pavelsavara pavelsavara is a code owner

+1 more reviewer

@am11 am11 am11 left review comments

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3 participants

@stephentoub @am11 @tannergooding