[PATCH] D80236: [VectorCombine] position pass after SLP in the optimization pipeline rather than before

[Nikita Popov via Phabricator via llvm-commits]

nikic added a comment.

It turns out that the main impact of this change (both in terms of compile-time, and in terms of text size changes) is not the move of the VectorCombine pass, but the move of the EarlyCSE pass. If I leave EarlyCSE where it is and only move VectorCombine, the results is essentially noise <http://llvm-compile-time-tracker.com/compare.php?from=22ed724975d265086149dcac8d2c983c1e49f13f&to=96251186b9cd51566474e1e0645c9eb4b4deaf3e&stat=instructions>. (Which doesn't tell us anything about which EarlyCSE placement produces better code...)


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https://reviews.llvm.org/D80236