[PATCH] D56281: [DAGCombiner] reduce buildvec of zexted extracted element to shuffle

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

I also wonder if we have much crossover with PR39975 (truncate(extract()) -> extract(bitcast())) to handle TRUNCATE as well as *_EXTEND


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https://reviews.llvm.org/D56281