tree 9e60267535229612dcf14f82f26dee9a7b8da8ad
parent 1e5e8ca7729916761be82d5bd5d01a11d654c3e8
author Craig Topper <craig.topper@sifive.com> 1659585621 -0700
committer Copybara-Service <copybara-worker@google.com> 1659585989 -0700

[X86] Teach PostprocessISelDAG to fold ANDrm+TESTrr when chain result is used.

The isOnlyUserOf prevented the fold if the chain result had any
users. What we really care about is the the data result from the
AND is only used by the TEST, and the flags results from the ANDs
aren't used at all. It's ok if the chain has users, we just need
to replace those users with the chain from the TESTrm.

Reviewed By: LuoYuanke

Differential Revision: https://reviews.llvm.org/D131117

GitOrigin-RevId: 91e8079cd535a736cb6aabd24fc310a8ec46a07f