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crossgen2-comparison windows x86 Release to x86 windows failing for System.Private.CoreLib #115661

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#117945
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crossgen2-comparison windows x86 Release to x86 windows failing for System.Private.CoreLib#115661
#117945
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max-charlamb
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area-ReadyToRunblocking-clean-ci-optionalBlocking optional rolling runs
Milestone
10.0.0

Description

@elinor-fung
elinor-fung
opened on May 16, 2025

Example build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1043288&view=results

Comparing crossgen results in "C:\h\w\9D490889\w\AAA3099F\u\prebuiltWork\log" and "C:\h\w\9D490889\w\AAA3099F\uploads" directories for files of type "NativeOrReadyToRunImage":
File hash sum mismatch for "System.Private.CoreLib" assembly for files of type "NativeOrReadyToRunImage":
 - "C:\h\w\9D490889\w\AAA3099F\u\prebuiltWork\log" has "eb257a2ff5dc02fb96f92a781432bb5ef7c52b2bfa1ff42c5bbba04f960bb79c"
 - "C:\h\w\9D490889\w\AAA3099F\uploads" has "a6a96aba010df04e946fad72fef8e4e90f4fbbdcf3afff9f37be2c621df61344"
Number of omitted results: 0
Number of mismatched results: 1
Total number of files compared: 236

Activity

  1. elinor-fung
    added
    area-ReadyToRun
    blocking-clean-ci-optionalBlocking optional rolling runs
    on May 16, 2025
  2. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on May 16, 2025

  3. elinor-fung commented on May 16, 2025

    @elinor-fung
    elinor-fung
    on May 16, 2025
    MemberAuthor

    Last successful run: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1036671&view=results
    First failed run: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1037561&view=results

    Diff: b9d7c8b...d23f251

  4. mangod9
    assigned
    max-charlamb
    on Jul 21, 2025
  5. mangod9
    removed
    untriagedNew issue has not been triaged by the area owner
    on Jul 21, 2025
  6. mangod9
    modified the milestones: 11.0.0, 10.0.0 on Jul 21, 2025

  7. max-charlamb commented on Jul 21, 2025

    @max-charlamb
    max-charlamb
    on Jul 21, 2025
    Member

    I looked into how the two System.Private.Corelib.dll differ and it appears the codegen for

    System.ValueTuple`2<System.Numerics.Vector`1<float>,System.Numerics.Vector`1<float>> System.Runtime.Intrinsics.VectorMath.<SinCosSingle>g__ScalarFallback|29_1<System.Numerics.Vector`1<float>, System.Numerics.Vector`1<int>, System.Numerics.Vector`1<double>, System.Numerics.Vector`1<long>>(System.Numerics.Vector`1<float>)

    is different when compiling on x86 vs x64. I'm wondering if this could be a codegen issue. There were some commits in the range that modified x86 intrinsics.

    x86 target compiling on x64
    x86 target compiling on x86

    The following 3 byte difference in encoding causes further instructions to not line up (among other differences).

    x86 on x64
0000000000670B8B F30F11849DBCFFFFFF   movss     [ebp+ebx*4-44h],xmm0

x86 on x86
0000000000670B8B F30F11449DBC         movss     [ebp+ebx*4-44h],xmm0

    I will keep looking into why these are generated differently.

  8. max-charlamb
    closed this as completedin #117945on Jul 23, 2025
  9. github-actions
    locked and limited conversation to collaborators on Aug 23, 2025
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