Do not eliminate casts from FP types when optimizing narrow stores #53667
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An optimization in morph was deleting casts on the RHS of a narrow store if the cast-to-type was wider than the type being stored. This is only valid for casts from integral types, as the backend does not handle "STOREIND(byte*, double)", nor is there an instruction to go from an XMM register to a narrow memory location on x86/x64. The issue is not reproducible right now because fgMorphCast wraps the casts in question, but it is an invalid IR transformation nonetheless, and similar code in fgMorphSmpOpOptional guards against non-integral sources.
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CC. @dotnet/jit-contrib, community PR |
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@kunalspathak @dotnet/jit-contrib PTAL community PR. |
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@SingleAccretion - No asmdiffs? |
Yes, no diffs as expected. |
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An optimization in morph was deleting casts on the RHS of a narrow store if the cast-to-type
was wider than the type being stored. This is only valid for casts from integral types, as the backend
does not handle
STOREIND(byte*, double), nor is there an instruction to go from anXMMregister to a narrow memory location on x86/x64.The issue is not reproducible right now because
fgMorphCastwraps the casts in question, but it is an invalid IR transformation nonetheless, and similar code infgMorphSmpOpOptionalguards against non-integral sources.Also, while I was there, modernized the code a little bit.