tree 45554b42e6231dfa3fc3f40b6b0794234c71d5f1
parent 9cf31b8d39d67843eeb314bacf6f78a1c969e1cc
author Sanjay Patel <spatel@rotateright.com> 1638220850 -0500
committer Sanjay Patel <spatel@rotateright.com> 1638223388 -0500

[InstCombine] try to fold 'or' into 'mul' operand

or (mul X, Y), X --> mul X, (add Y, 1) (when the multiply has no common bits with X)

We already have this fold if the pattern ends in 'add', but we can miss it if the
'add' becomes 'or' via another no-common-bits transform.

This is part of fixing:
http://llvm.org/PR49055
...but it won't make a difference on that example yet.

https://alive2.llvm.org/ce/z/Vrmoeb

Differential Revision: https://reviews.llvm.org/D114729