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Wrong size used for vectorization check in BitArray #111558

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PranavSenthilnathan opened this issue Jan 17, 2025 · 3 comments · May be fixed by #111564
Open

Wrong size used for vectorization check in BitArray #111558

PranavSenthilnathan opened this issue Jan 17, 2025 · 3 comments · May be fixed by #111564
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area-System.Collections good first issue Issue should be easy to implement, good for first-time contributors in-pr There is an active PR which will close this issue when it is merged tenet-performance Performance related issue
Milestone
10.0.0

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@PranavSenthilnathan
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Vector512 should be Vector128:

runtime/src/libraries/System.Collections/src/System/Collections/BitArray.cs

Line 888 in a73f163

else if (Ssse3.IsSupported && ((uint)m_length >= Vector512<byte>.Count * 2u))

Found by @saucecontrol
@PranavSenthilnathan PranavSenthilnathan added area-System.Collections good first issue Issue should be easy to implement, good for first-time contributors labels Jan 17, 2025
@PranavSenthilnathan PranavSenthilnathan added this to the 10.0.0 milestone Jan 17, 2025
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@stephentoub
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This ends up only being a performance bug, not functional / reliability, correct? We'll end up falling back to the scalar path more often than we otherwise could?

@saucecontrol
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saucecontrol commented Jan 17, 2025 •
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Yep, that's all. I suggested it as a good first PR on the community discord.

@jkotas jkotas changed the title Wrong size used for bounds check in BitArray Wrong size used for vectorization check in BitArray Jan 17, 2025
@jkotas jkotas added the tenet-performance Performance related issue label Jan 17, 2025
AnsBalin added a commit to AnsBalin/runtime that referenced this issue Jan 18, 2025
@AnsBalin
Fix size used for vectorization check in BitArray (dotnet#111558)
af1ae1f
@AnsBalin AnsBalin linked a pull request Jan 18, 2025 that will close this issue
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@dotnet-policy-service dotnet-policy-service bot added the in-pr There is an active PR which will close this issue when it is merged label Jan 18, 2025
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area-System.Collections good first issue Issue should be easy to implement, good for first-time contributors in-pr There is an active PR which will close this issue when it is merged tenet-performance Performance related issue
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Fix size used for vectorization check in BitArray (#111558) AnsBalin/runtime
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@stephentoub @jkotas @saucecontrol @PranavSenthilnathan