Replace OptimizedInboxTextEncoder vectorization with SearchValues #114494
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- src/libraries/System.Text.Encodings.Web/src/System.Text.Encodings.Web.csproj: Language not supported
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src/libraries/System.Text.Encodings.Web/tests/AllowedAsciiCodePointsTests.cs:1
- Removal of AllowedAsciiCodePointsTests.cs may reduce test coverage for the fast path. Consider adding new tests to validate the SearchValues-based approach.
// Entire test file removed
src/libraries/System.Text.Encodings.Web/src/System/Text/Encodings/Web/OptimizedInboxTextEncoder.cs:406
- Double-check that the combination of IndexOfAnyExcept with the char.IsAscii check correctly identifies the first disallowed character in all edge cases, especially when the span consists entirely of allowed characters.
if ((uint)asciiCharsSkipped >= (uint)data.Length || char.IsAscii(data[asciiCharsSkipped]))
...braries/System.Text.Encodings.Web/src/System/Text/Encodings/Web/OptimizedInboxTextEncoder.cs
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Tagging subscribers to this area: @dotnet/area-system-text-encodings-web |
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@MihuBot benchmark System.Text.Json |
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@MihuBot benchmark System.Text.Json -arm |
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Just wondering, does the optimization using SearchValues will still work fine on previous .NET versions like .NET 8? |
tarekgh
approved these changes
Apr 10, 2025
I'd expect it to be very similar in this case since we're limiting usage to ASCII-only sets. I'll see what the numbers show for short inputs. |
This was referenced Apr 10, 2025
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Numbers for X64 System.Text.Json.Tests.Perf_Strings
ARM64 System.Text.Json.Tests.Perf_Strings
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@EgorBot -mono --envvars MONO_ENV_OPTIONS:--interp --filter "Perf_Strings" |
This was referenced Apr 23, 2025
This was referenced Apr 23, 2025
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Some impressive improvements here for Wasm both interpreter and aot. Nice work! |
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Closes #114437
I only replaced the existing ASCII-only fast path.
If we wanted to later, we could add a SearchValues implementation that handles the large character sets that STEW uses, in which case the .NET core implementation would just directly forward to SearchValues.