commit e0e5795f6b9d2b903e60d968a8c9dbcc7972d2f4
author Sanjoy Das <sanjoy@playingwithpointers.com> Wed Feb 01 16:34:55 2017 +0000
committer Sanjoy Das <sanjoy@playingwithpointers.com> Wed Feb 01 16:34:55 2017 +0000
tree 7c9ad3b6312a5ba83234d9309a62b4d28657061c
parent ca931efc21c5791f90e29eb8fa7690db6769fa67

[InstCombine] Allow InstCombine to merge adjacent guards

Summary:
If there are two adjacent guards with different conditions, we can
remove one of them and include its condition into the condition of
another one. This patch allows InstCombine to merge them by the
following pattern:

    guard(a); guard(b) -> guard(a & b).

Reviewers: reames, apilipenko, igor-laevsky, anna, sanjoy

Reviewed By: sanjoy

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29378

llvm-svn: 293778