[PATCH] D48768: [X86] When have BMI2, prefer shifts to clear low/high bits, rather than variable mask.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

If you do the one use check in the DAG combine to qualify the reverse, then we can use existing isel patterns to select each shift individually right?


Repository:
  rL LLVM

https://reviews.llvm.org/D48768