[jitstress-isas-x86] Assertion failed 'compiler->compIsaSupportedDebugOnly(isa)' during 'Generate code'

[jakobbotsch]

The jitstress-isas-x86 pipeline is frequently failing with this assertion failure in many tests.
Example pipeline run: https://dev.azure.com/dnceng/public/_build/results?buildId=1870359&view=results

Assert failure(PID 7472 [0x00001d30], Thread: 9756 [0x261c]): Assertion failed 'compiler->compIsaSupportedDebugOnly(isa)' in 'HillClimbing:Update(int,double,int):System.ValueTuple`2[Int32,Int32]:this' during 'Generate code' (IL size 1472; hash 0x27d1e134; FullOpts)

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Issue Details

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The jitstress-isas-x86 pipeline is frequently failing with this assertion failure in many tests.
Example pipeline run: https://dev.azure.com/dnceng/public/_build/results?buildId=1870359&view=results

Assert failure(PID 7472 [0x00001d30], Thread: 9756 [0x261c]): Assertion failed 'compiler->compIsaSupportedDebugOnly(isa)' in 'HillClimbing:Update(int,double,int):System.ValueTuple`2[Int32,Int32]:this' during 'Generate code' (IL size 1472; hash 0x27d1e134; FullOpts)

Author:	jakobbotsch
Assignees:	-
Labels:	area-CodeGen-coreclr, untriaged
Milestone:	-

[jakobbotsch]

This is a relatively recent regression, the June 18th run does not have this problem while June 25th does.

[jakobbotsch]

From a bisection this seems to be introduced/exposed by #69434. @tannergooding do you have an idea why that could cause this problem?

[tannergooding]

I expect there is a mismatched check around the "baseline" ISAs (SSE/SSE2) and COMPlus_EnableSSE2=0 being set. Will take a look

[JulieLeeMSFT]

Same assertion in a different method.

• Pipeline: https://dev.azure.com/dnceng/public/_build/results?buildId=1885686&view=results
• Console log: Link

Assert failure(PID 24198 [0x00005e86], Thread: 24198 [0x5e86]): Assertion failed 'compiler->compIsaSupportedDebugOnly(isa)' in 'JIT.HardwareIntrinsics.General.VectorBinaryOpTest__op_DivisionDouble:.ctor():this' during 'Generate code' (IL size 264; hash 0x7d5d7518; FullOpts)

• Console Log: Link

Assert failure(PID 24236 [0x00005eac], Thread: 24236 [0x5eac]): Assertion failed 'compiler->compIsaSupportedDebugOnly(isa)' in 'JIT.HardwareIntrinsics.General.VectorBinaryOpTest__DivideDouble:.ctor():this' during 'Generate code' (IL size 264; hash 0x7c8af1a2; FullOpts)

[JulieLeeMSFT]

runtime-coreclr jitstress-isas-x86 is constatnly failing.