[PATCH] D48346: [X86] Rewrite the add/mul/or/and reduction intrinsics to make better use of other intrinsics and remove undef shuffle indices.

[Simon Pilgrim via Phabricator via cfe-commits]

RKSimon accepted this revision.
RKSimon added a comment.
This revision is now accepted and ready to land.

LGTM (with suitable IR fast-isel tests in llvm)


https://reviews.llvm.org/D48346



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