[PATCH] D157801: [ValueTracking] Use predicates for incoming phi-edges to deduce non-zero

Noah Goldstein via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Sun Aug 13 10:30:51 PDT 2023


goldstein.w.n marked an inline comment as done.
goldstein.w.n added inline comments.


================
Comment at: llvm/lib/Analysis/ValueTracking.cpp:2685
+        // Check for cases of duplicate successors.
+        if ((TrueSucc == PN->getParent()) != (FalseSucc == PN->getParent())) {
+          // If we're using the false successor, invert the predicate.
----------------
nikic wrote:
> `if (TrueSucc != FalseSucc)` would be less confusing, I think?
This is cut/paste from the knownbits codes. Would rather just add NFC follow up to both of these two update to less confusing logic (and will do so unless you object).


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  https://reviews.llvm.org/D157801/new/

https://reviews.llvm.org/D157801



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