[PATCH] D113897: [GVNSink] Make GVNSink resistant against self referencing instructions (PR36954)

[Dawid Jurczak via Phabricator via llvm-commits]

yurai007 added inline comments.


================
Comment at: llvm/lib/Transforms/Scalar/GVNSink.cpp:582
     ReversePostOrderTraversal<Function*> RPOT(&F);
+    VN.setReachableBBs(collectBlocksReachableFromEntry(F));
+
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nikic wrote:
> Can't you just reuse RPOT here? That is, iterate it into a set? RPOT doesn't visit unreachable blocks, and it is cached, so reusing it is fine.
Thanks for pointing this out. I had to have some kind of mental block to not see how RPOT could be reused in such obvious way.  


Repository:
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  https://reviews.llvm.org/D113897/new/

https://reviews.llvm.org/D113897