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On Arm32 lower asserts in NewPutArg() after morph does transformation from OBJ(struct<CanBeReinterpretedAsDouble, 8>, byRef) to IND(double, byRef) for stack arguments passed by value.

As far as I can tell, the transformation is legal, but the way lower validates the type and size of an argument is incorrect - it calls varTypeIsSIMD() which always returns false on Arm32.

The change makes the assert look similar to the one in morph https://github.com/dotnet/runtime/blob/main/src/coreclr/jit/morph.cpp#L3676

Fixes #62249

@dotnet/jit-contrib

…returns false.

Change the assert, so it checks that the argument type is TYP_DOUBLE in Lowering::NewPutArg() in src/coreclr/jit/lower.cpp
@ghost ghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Dec 4, 2021
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ghost commented Dec 4, 2021

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Issue Details

On Arm32 lower asserts in NewPutArg() after morph does transformation from OBJ(struct<CanBeReinterpretedAsDouble, 8>, byRef) to IND(double, byRef) for stack arguments passed by value.

As far as I can tell, the transformation is legal, but the way lower validates the type and size of an argument is incorrect - it calls varTypeIsSIMD() which always returns false on Arm32.

The change makes the assert look similar to the one in morph https://github.com/dotnet/runtime/blob/main/src/coreclr/jit/morph.cpp#L3676

Fixes #62249

@dotnet/jit-contrib

Author: echesakovMSFT
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area-CodeGen-coreclr

Milestone: -

@JulieLeeMSFT JulieLeeMSFT added this to the 7.0.0 milestone Dec 4, 2021
@echesakov echesakov merged commit 14e8df1 into dotnet:main Dec 4, 2021
@echesakov echesakov deleted the Runtime_62249 branch December 4, 2021 23:11
@ghost ghost locked as resolved and limited conversation to collaborators Jan 4, 2022
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Assertion failed 'varTypeIsSIMD(arg) || (info->GetStackSlotsNumber() == 1)' during 'Lowering nodeinfo' (IL size 105)

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