[PATCH] D52570: [X86] Don't generate BMI BEXTR from X86DAGToDAGISel::matchBEXTRFromAnd

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In the short term I think a fast feature flag (for bdver/btver/znver amd targets) is the way to go - this will solve your immediate regression and give us time to get a proper scheduler model driven solution in place (I have my eye on BEXTR, SHLD/SHRD and LEA feature flags to be replaced by this).


https://reviews.llvm.org/D52570