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Use vectorized SpanHelpers.SequenceEqual for string equality#16994
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jkotas merged 1 commit intodotnet:masterfrom Mar 17, 2018
Merged
Use vectorized SpanHelpers.SequenceEqual for string equality#16994jkotas merged 1 commit intodotnet:masterfrom
jkotas merged 1 commit intodotnet:masterfrom
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Depends on dotnet/corefx#28080 that is changing SpanHelpers.SequenceEqual argument to nuint. |
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cc @marek-safar |
ahsonkhan
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Mar 16, 2018
| return (value.Length == 1) ? | ||
| true : // First char is the same and thats all there is to compare | ||
| StartsWithOrdinalHelper(this, value); | ||
| SpanHelpers.SequenceEqual( |
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What happens if this.Length is less than value.Length?
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This condition is checked two lines above this one.
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@jkotas very nice We are still using https://github.com/dotnet/corert/blob/master/src/System.Private.CoreLib/src/System/String.Comparison.cs but this file looks quite easy to unify/share |
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@dotnet-bot test this please |
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@dotnet-bot test Ubuntu x64 Checked corefx_baseline |
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SpanHelpers.SequenceEqual is our optimized workhorse for comparing blocks of memory. Use it for string equality instead of ad-hoc optimized loops.
"Hello world!".Equals("Hello world?")is 20% faster on x64 with this change and it only gets better from there.