[mono] The bitcast test fails with exit code 104 on apple mobile platforms

[kotlarmilos]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=349474
Build error leg or test failing: JIT_Intrinsics.WorkItemExecution
Pull request: #89296

Error Message

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

{
  "ErrorMessage": "Application has finished with exit code 104 but 100 was expected",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

The BitCast test fails with exit code 104 on the apple mobile platforms. I will try to get more details locally.

/cc: @EgorBo

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=349474
Error message validated: Application has finished with exit code 104 but 100 was expected
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/24/2023 1:23:25 PM UTC

Report

Build	Definition	Test	Pull Request
353900	dotnet/runtime	JIT_Intrinsics.WorkItemExecution	#89555
349967	dotnet/runtime	JIT_Intrinsics.WorkItemExecution	#88167
349510	dotnet/runtime	JIT_Intrinsics.WorkItemExecution
349474	dotnet/runtime	JIT_Intrinsics.WorkItemExecution	#89296
349328	dotnet/runtime	JIT_Intrinsics.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
1	5	5

Tagging subscribers to 'os-ios': @steveisok, @akoeplinger, @kotlarmilos
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Issue Details

---

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=349474
Build error leg or test failing: JIT_Intrinsics.WorkItemExecution
Pull request: #89296

Error Message

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

{
  "ErrorMessage": "Application has finished with exit code 104 but 100 was expected",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

The BitCast test fails with exit code 104 on the apple mobile platforms. I will try to get more details locally.

/cc: @EgorBo

Author:	kotlarmilos
Assignees:	-
Labels:	blocking-clean-ci, area-Codegen-AOT-mono, os-ios, Known Build Error
Milestone:	8.0.0

[EgorBo]

cc @MichalPetryka

Perhaps, it's already fixed with #89364 (if that was the issue)

[MichalPetryka]

Looks like the 4 tests for implicit floating point casting fail on Mono and instead of casting just reinterpret the bits.
Such implicit conversion of float32 <-> float64 is legal in IL as per the ECMA so this looks like a Mono runtime bug.

[kotlarmilos]

Verify(1065353216L, Unsafe.BitCast<float, int>(1f), 31);
Verify(4607182418800017408L, Unsafe.BitCast<double, long>(1.0), 32);
Verify(1065353216L, Unsafe.BitCast<float, int>((float)NoInline(1.0)), 33);
Verify(4607182418800017408L, Unsafe.BitCast<double, long>((double)NoInline(1f)), 34);

JIT_Intrinsics[2155:332550] Failed at line 31, expected 1065353216, got 0
JIT_Intrinsics[2155:332550] Failed at line 32, expected 4607182418800017408, got 1065353216
JIT_Intrinsics[2155:332550] Failed at line 33, expected 1065353216, got 0
JIT_Intrinsics[2155:332550] Failed at line 34, expected 4607182418800017408, got 1065353216
JIT_Intrinsics[2155:332550] DOTNET.APP_EXIT_CODE: 104

[kotlarmilos]

I didn't manage to reproduce it locally with Unsafe.BitCast<float, int>(1f).

IL_006b: ldc.r4 1
IL_0070: call !!1 [System.Runtime]System.Runtime.CompilerServices.Unsafe::BitCast<float32, int32>(!!0)

However, with implicit casting it fails.

IL_00bc:  ldc.r8 1.
IL_00c5:  call !!1 [System.Runtime]System.Runtime.CompilerServices.Unsafe::BitCast<float32,int32>(!!0)