[PATCH] D149404: [ValueTracking][InstCombine] Add a new API to allow to ignore poison generating flags or metadatas when implying poison

Noah Goldstein via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Thu Apr 27 23:38:23 PDT 2023


goldstein.w.n added inline comments.


================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp:2938
+    SmallVector<Instruction *> DropFlags;
+    if (impliesPoisonIgnoreFlagsOrMetadatas(FalseVal, CondVal, DropFlags)) {
+      for (Instruction *I : DropFlags)
----------------
Will you ever not loop through instruction and do `dropPoisonGenerating...`? Maybe it should done by `impliesPoisonIgnore...` and if its not always with a `bool` to control it.


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  https://reviews.llvm.org/D149404/new/

https://reviews.llvm.org/D149404



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