Optimize `string.Split(char, ...)` - #125379

Merged

tannergooding merged 37 commits into

dotnet:mainfrom

hamarb123:main33

Jul 5, 2026

Commits on Mar 10, 2026

Optimize string.Split(char, ...)
hamarb123
committed
6caf82d
Add additional optimization for the case where separators are sparse or non-existent, which is similar to what IndexOf does
hamarb123
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9ed7713
Remove unnecessary using
hamarb123
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35cfe8b
Address most feedback from copilot
hamarb123
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93b7acc
Update SpanHelpers.Packed.cs
hamarb123
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43eef0e
Address copilot feedback
hamarb123
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ce9162e
Add vectorized handling for remnant
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65db592
Address copilot feedback
hamarb123
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182aaa1
Update String.Manipulation.cs
hamarb123
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b68c868

Commits on Mar 11, 2026

Add tests
hamarb123
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8fdc167
Fix copy & paste error
hamarb123
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69b0594
Fix test failures
hamarb123
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f2a7749

Commits on May 5, 2026

Convert to safe simd using copilot
hamarb123
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fdf8887
Merge branch 'main' into main33
hamarb123
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939c5ae
Apply suggestions from code review

hamarb123
and
Copilot
authored
5ac03e1
Fix typing
hamarb123
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443ec50
Merge branch 'main33' of https://github.com/hamarb123/runtime into main33
hamarb123
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8a13cab
Change spacing back for 'MakeSeparatorListAny'
hamarb123
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46f82cd

Commits on Jun 25, 2026

Merge branch 'main' into main33
hamarb123
authored
6551e90

Commits on Jun 26, 2026

Update src/libraries/System.Private.CoreLib/src/System/String.Manipulation.cs
hamarb123
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67fdc66
Re-order cases to be more optimal
hamarb123
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f91b0e3
Fix compile error
hamarb123
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2470c78

Commits on Jun 27, 2026

test if changing 3 param version also is profitable
hamarb123
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10a73ed
Clean up new code (and existing code) by making cmp directly in all cases
hamarb123
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d4732bd
fix logic
hamarb123
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1084e9d
Revert 1-3 to be shared logic
hamarb123
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cb8d731
Update String.Manipulation.cs
hamarb123
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13d9e25
Update String.Manipulation.cs
hamarb123
committed
8be94ce
Update String.Manipulation.cs
hamarb123
committed
585430f
Add some additional tests
hamarb123
committed
e0be16e
Merge branch 'main' into main33
hamarb123
authored
f34210b
Try more optimal comparison sequence
hamarb123
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dd77554
Re-add special handling for 1-char case
hamarb123
committed
2871b1e

Commits on Jul 4, 2026