Test failure: JIT/IL_Conformance/Convert/TestConvertFromIntegral/TestConvertFromIntegral.dll

[v-wenyuxu]

Failed in: runtime-coreclr r2r-extra 20250208.1

Failed tests:

R2R-CG2 windows x64 Checked jitstressregs8 @ Windows.10.Amd64.Open
    - JIT/IL_Conformance/Convert/TestConvertFromIntegral/TestConvertFromIntegral.dll

Error message:

 Assert.Equal() Failure: Values differ
Expected: 100
Actual:   101

Stack trace:

   at Xunit.Assert.Equal[T](T expected, T actual, IEqualityComparer`1 comparer) in /_/src/Microsoft.DotNet.XUnitAssert/src/EqualityAsserts.cs:line 174
   at Program.<<Main>$>g__TestExecutor399|0_400(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)

[dotnet-policy-service]

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch
See info in area-owners.md if you want to be subscribed.

[amanasifkhalid]

I suspect this is a register allocation issue. Test output:

No exception in DynamicConvertFromSystem.SingleToSystem.SByte1Opconv.ovf.i1
Wrong result in DynamicConvertFromSystem.SingleToSystem.SByte0Opconv.ovf.i1.un
No exception in DynamicConvertFromSystem.SingleToSystem.SByte0Opconv.ovf.i1.un
Wrong result in DynamicConvertFromSystem.SingleToSystem.Byte0Opconv.ovf.u1.un
Wrong result in DynamicConvertFromSystem.SingleToSystem.Int160Opconv.ovf.i2.un
Wrong result in DynamicConvertFromSystem.SingleToSystem.UInt160Opconv.ovf.u2.un
Wrong result in DynamicConvertFromSystem.SingleToSystem.UInt320Opconv.ovf.u4.un
Wrong result in DynamicConvertFromSystem.SingleToSystem.Int640Opconv.ovf.i8.un
Wrong result in DynamicConvertFromSystem.SingleToSystem.UInt640Opconv.ovf.u8.un
No exception in DynamicConvertFromSystem.DoubleToSystem.SByte1Opconv.ovf.i1
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.SByte9.223372036854776E+18Opconv.ovf.i1.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.ByteNaNOpconv.ovf.u1.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.Int16NaNOpconv.ovf.i2.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.UInt16NaNOpconv.ovf.u2.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.Int32NaNOpconv.ovf.i4.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.UInt32NaNOpconv.ovf.u4.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.Int64NaNOpconv.ovf.i8.un
Not expected exception in DynamicConvertFromSystem.DoubleToSystem.UInt64NaNOpconv.ovf.u8.un

Repros with the following:

set DOTNET_TieredCompilation=0
set DOTNET_JitStressRegs=8

cc @dotnet/jit-contrib

[JulieLeeMSFT]

@kunalspathak, PTAL.

[amanasifkhalid]

This might be fixed by #112217. I would wait for that to go in before starting to work on a different fix.