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4566585f18
At this point, we can treat the case of GEP/GEP aliasing and GEP/non-GEP aliasing in essentially the same way. The only differences are that we need to do an additional negative GEP base check, and that we perform a bailout on unknown sizes for the GEP/non-GEP case (the latter exists only to limit compile-time). This change is not quite NFC due to the peculiar effect that the DecomposedGEP for V2 can actually be non-trivial even if V2 is not a GEP. The reason for this is that getUnderlyingObject() can look through LCSSA phi nodes, while stripPointerCasts() doesn't. This can lead to slightly better results if single-entry phi nodes occur inside a loop, where looking through the phi node via aliasPhi() would subject it to phi cycle equivalence restrictions. It would probably make sense to adjust pointer cast stripping (for AA) to handle this case, and ensure consistent results. |
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