[PATCH] D52195: [DAGCombiner][x86] add transform/hook to decompose integer multiply into shift/add
Simon Pilgrim via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Sep 18 08:59:20 PDT 2018
RKSimon added a comment.
> The shakiest test diff here may be SSE4.1 code that uses 'pmulld' with a constant pool load. That can become 4 instructions like:
pmullw could be worse - that's often just 2/3cy latency
https://reviews.llvm.org/D52195
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