ARM-SVE: Fix validation logic for GatherVectorByteOffsetFirstFaulting tests
#107165
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@dotnet/jit-contrib could you PTAL? Thanks! |
TIHan
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Aug 30, 2024
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Fixes #106621. Fixes #106815.
ValidateFirstFaultingResult, we pass theBoundedMemoryobject's underlying byte array directly toCheckGatherVectorWithByteOffsetFirstFaultingBehaviorinstead of first converting it to an array of the user-facing type. This way, we don't risk dropping any bytes via imprecise length conversions for byte amounts that aren't multiples of the base type's size (i.e. if theBoundedMemoryobject is 5 bytes long, the naive calculationinBounded.Length / Unsafe.SizeOf<Int32>()will drop the last byte).CheckGatherVectorWithByteOffsetFirstFaultingBehavior, when we're determining the expected fault result, it is not enough to check if the starting offset is out-of-bounds; we also have to factor in the size of the load to ensure the remaining bytes of the load operation fault if they walk off the end of the byte array.@dotnet/arm64-contrib PTAL. All
GatherVectorFirstFaultingtests pass under stress modes. Thanks!