Fix Unnecessary sign-extension for `(nuint)span.Length`#88136

Merged

jakobbotsch merged 19 commits intodotnet:mainfrom

En3Tho:issue-84564

Oct 10, 2023

Commits on Jun 28, 2023

unconditionally set isNeverNegative in morph, use that data when optimizing casts
En3Tho
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Commits on Jun 29, 2023

cr, change condition and apply optimization to winX64 only
En3Tho
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Commits on Jun 30, 2023

Commits on Jul 4, 2023

Commits on Aug 8, 2023

Merge branch 'main' of https://github.com/dotnet/runtime into issue-84564
En3Tho
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Commits on Sep 29, 2023

CR: removed IsSpan from GenTreeLclVar and used proposed change in PromoteStructVar
En3Tho
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Commits on Oct 1, 2023

Commits on Oct 3, 2023

It seems like it affects something after all?
En3Tho
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Commits on Oct 9, 2023

Optimize spans only when Optimizations are enabled
En3Tho
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Commits on Oct 10, 2023

revert OptimizationEnabled check
En3Tho
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