[DAGCombiner] Add simple folds for SMULFIX/UMULFIX/SMULFIXSAT
Summary:
Add the following DAGCombiner folds for mulfix being
one of SMULFIX/UMULFIX/SMULFIXSAT:
(mulfix x, undef, scale) -> 0
(mulfix x, 0, scale) -> 0
Also added canonicalization of constants to RHS.
Reviewers: RKSimon, craig.topper, spatel
Reviewed By: RKSimon
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D66052
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369103
91177308-0d34-0410-b5e6-
96231b3b80d8
projects / llvm / commit