[PATCH] D46760: [InstCombine] Enhance narrowUDivURem.

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

Note that we don't actively canonicalize to shifts:
 %t1 = shl i64 %x, 3

  %r = and i64 %t1, -32

>
=

  %right = lshr i64 %x, 2
  %r = shl i64 %right, 5

https://rise4fun.com/Alive/uz6Y

...so from an instcombine perspective, this is just a case of a *missing* transform (rather than reversing an existing transform).


Repository:
  rL LLVM

https://reviews.llvm.org/D46760