tree 17522bf2560463426b06f1b1786fe6e9f9bdf0fe
parent d3f6a88a1fb36f94c71940514e576821c6cc3ade
author Usman Nadeem <mnadeem@quicinc.com> 1713974382 -0700
committer GitHub <noreply@github.com> 1713974382 -0700
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[GVN] Restrict equality propagation for pointers (#82458)

This patch does the following:

Adds the following functions:
- replaceDominatedUsesWithIf() that takes a callback.

- canReplacePointersIfEqual(...) returns true if the underlying object
is the same, and for null and const dereferencable pointer replacements.

- canReplacePointersIfEqualInUse(...) returns true for the above as well
as if the use is in icmp/ptrtoint or phi/selects feeding into them.

Updates GVN using the functions above so that the pointer replacements
are only made using the above API.

https://reviews.llvm.org/D143129