[release/6.0] Add cast when replacing promoted struct with field in lowering #58951
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We may need to sign/zero-extend when we do this replacement very late. Normally this cast would be inserted in morph. Fix #58373
Retyping it to the type of the ret node is not right when reinterpreting small structs as a type that needs to be normalized.
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Tagging subscribers to this area: @JulieLeeMSFT Issue DetailsBackport of #58589 to release/6.0 /cc @jakobbotsch Customer ImpactTestingRisk
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jeffschwMSFT
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Sep 10, 2021
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Approved. Please get a code review and once we have a green ci we can merge.
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CC @AndyAyersMS PTAL. |
AndyAyersMS
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Sep 10, 2021
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Backport of #58589 to release/6.0
/cc @jakobbotsch
Customer Impact
Returning a pointer indirection reinterpreting a small struct as a small primitive type does not correctly zero/sign extend the result. We have one such case in our own libraries.
Testing
There are two test cases included.
Risk
Low, this is a targeted fix that inserts the necessary zero/sign-extensions when necessary.