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[not for review] Investigate ARM test failure in P0811R3_midpoint_lerp - #6386

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[not for review] Investigate ARM test failure in P0811R3_midpoint_lerp#6386
statementreply wants to merge 2 commits into
microsoft:mainfrom
statementreply:armtest

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Not for review

Copilot AI review requested due to automatic review settings July 29, 2026 15:41
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statementreply requested a review from a team as a code owner July 29, 2026 15:41
@github-project-automation github-project-automation Bot moved this to Initial Review in STL Code Reviews Jul 29, 2026
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Azure Pipelines:
Successfully started running 1 pipeline(s).
There may be pipelines that require an authorized user to comment /azp run to run.

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Pull request overview

Narrows CI to reproduce the ARM64 floating-point exception failure.

Changes:

  • Re-enables ARM64 exception validation.
  • Restricts CI to ARM64 and the affected test.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File Description
tests/std/tests/P0811R3_midpoint_lerp/test.cpp Removes ARM64 exception-check workaround.
azure-pipelines.yml Runs only ARM64 testing.
azure-devops/cmake-configure-build.yml Filters testing to the midpoint/lerp test.

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Comment thread azure-pipelines.yml
- Build_ARM64
- Build_ARM64EC
- Configure_Tests
dependsOn: []
- '--order=lexical'
- '--num-shards=$(System.TotalJobsInPhase)'
- '--run-shard=$(System.JobPositionInPhase)'
- '--filter=P0811R3_midpoint_lerp'
Copilot AI review requested due to automatic review settings July 29, 2026 15:48

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Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

Comments suppressed due to low confidence (2)

azure-pipelines.yml:14

  • This leaves the repository's primary PR pipeline with only the ARM64 test stage, so code-format validation and all x64, x86, and ARM64EC build/test coverage disappear for every PR using this pipeline. Keep the normal stages intact and move this focused investigation to a separate temporary/manual pipeline (or gate the reduced graph behind an explicit diagnostic parameter) before merging.
    dependsOn: []

azure-devops/cmake-configure-build.yml:28

  • This filter is added to the shared cmake-configure-build.yml default, which is also reached by all three jobs in azure-devops/asan-pipeline.yml:30,49,68. Those scheduled ASan jobs will therefore run only this test instead of the ASan suite. Thread an optional litFlags/filter parameter through build-and-test.yml and set it only on the investigative ARM64 job.
    - '--filter=P0811R3_midpoint_lerp'

Copilot AI review requested due to automatic review settings July 29, 2026 16:02

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Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (2)

azure-pipelines.yml:14

  • The production pipeline now contains only this independent ARM64 stage; code-format validation and the x64, x86, and ARM64EC build/test stages have all been removed. This would allow regressions on those supported targets to merge undetected. Restore the normal stage matrix after the investigation.
    dependsOn: []

azure-devops/cmake-configure-build.yml:28

  • This shared configure template now hard-codes a filter for one test, so every current or future build-and-test.yml caller silently excludes the rest of the test suite. Remove this diagnostic filter before merging, or expose it as an optional parameter passed only by a dedicated investigation pipeline.
    - '--filter=P0811R3_midpoint_lerp'

#if defined(_M_ARM64) || defined(_M_ARM64EC) // TRANSITION, GH-5685
return true;
#else // ^^^ workaround / no workaround vvv
return fetestexcept(except_mask) == (expected_excepts & except_mask);
@StephanTLavavej StephanTLavavej added ARM64 Related to the ARM64 architecture uncharted Excluded from the Status Chart labels Jul 29, 2026
@StephanTLavavej StephanTLavavej moved this from Initial Review to Work In Progress in STL Code Reviews Jul 29, 2026
@statementreply statementreply changed the title [not for review] Investigate ARM test failure inP0811R3_midpoint_lerp [not for review] Investigate ARM test failure in P0811R3_midpoint_lerp Jul 30, 2026
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ARM64 Related to the ARM64 architecture uncharted Excluded from the Status Chart

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