[Perf] Windows/x64: System.Buffers.Text.Tests.Base64Tests Regression on 7/25/2025 1:05:34 AM +00:00

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	dd7a848e0fcad055e10ab66dd3787fb8c881b67d
Compare	a791373ecee502895eaa6b3c5e63d1baf6bd74f9
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Buffers.Text.Tests.Base64Tests

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Base64Encode - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	23.73 ns	27.24 ns	1.15	0.09	False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Text.Tests.Base64Tests*'

System.Buffers.Text.Tests.Base64Tests.Base64Encode(NumberOfBytes: 1000)

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[LoopedBard3]

Maybe #118030 in range 1e860a4...988fde5. Do you know if that may be the case @MihaZupan?

Related Regression:

• [Perf] Windows/arm64: 1 Regression on 7/28/2025 12:16:09 AM +00:00 perf-autofiling-issues#59932 (Incorrect listed date)

[MihaZupan]

Shouldn't be, that change is only touching debug asserts

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