[PATCH] D46946: [X86] Lowering shift intrinsics to native IR

[Tomasz Krupa via Phabricator via llvm-commits]

tkrupa added a comment.

Nevermind, I got it wrong - after compiling something similar to https://bugs.llvm.org/show_bug.cgi?id=37417, it does split the pattern. Moreover, it splits it in different manner for different intrinsics and hoists more than one more instruction, so it might not be as simple as moving back than one subtraction in the bug reproducer. I don't think there is any other way though - replicating simplifyX86immShift and simplifyX86varShift directly in IR would be a nightmare.


Repository:
  rL LLVM

https://reviews.llvm.org/D46946