[PATCH] D79104: [X86] Update cost model for the cost of s/zextending from vXi1 to a vXi8/i16/i32 vector of less than 128 bits

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

My main concern is that a lot of this is very dependent on what generated the vXi1 in the first place - if it was a vector compare then we can usually ext/trunc very cheaply.


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  https://reviews.llvm.org/D79104/new/

https://reviews.llvm.org/D79104