[PATCH] D63004: [TargetLowering] Simplify (ctpop x) == 1

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 added a comment.

@spatel Maybe we should just expand in it instcombine? I found something interesting...

Example: https://pastebin.com/NdMSsuri
Compiled with -O3 flag.

Even with this patch, f1 and f2 variants are not same (execution time), f2 is much faster. If I disable loop vectorization, there are almost same. Maybe loop vectorizer cannot handle ctpop very well? @craig.topper


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  https://reviews.llvm.org/D63004/new/

https://reviews.llvm.org/D63004