[PATCH] D121147: [x86] try harder to use shift instead of test if it can save some immediate bytes

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

I like this, but I don't know if any intel archs have slow shift-by-imm ops (slow eflags updates) like they do for non-immediate shift amounts?


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  https://reviews.llvm.org/D121147/new/

https://reviews.llvm.org/D121147