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[iOS-sim][x64] CoreCLR build fails with missing X86.F16C intrinsics #123139

@matouskozak

Description

@matouskozak

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1251385&view=logs&j=0bd79992-9086-5fc7-8d1a-07826b69ffb5
Build error leg or test failing: Build / iossimulator-x64 Release AllSubsets_CoreCLR_Smoke / Build product
Pull request: #119575

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "Failed to load type 'System.Runtime.Intrinsics.X86.F16C' from assembly 'System.Private.CoreLib",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1251385
Error message validated: [Failed to load type 'System.Runtime.Intrinsics.X86.F16C' from assembly 'System.Private.CoreLib]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 1/13/2026 4:44:29 PM UTC

Report

Build Definition Step Name Console log Pull Request
1251868 dotnet/runtime Build product Log #122371
1251385 dotnet/runtime Build product Log #119575

Summary

24-Hour Hit Count 7-Day Hit Count 1-Month Count
2 2 2

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