[MemorySSA] Teach LoopSimplify to preserve MemorySSA.
Summary:
Preserve MemorySSA in LoopSimplify, in the old pass manager, if the analysis is available.
Do not preserve it in the new pass manager.
Update tests.
Subscribers: nemanjai, jlebar, javed.absar, Prazek, kbarton, zzheng, jsji, llvm-commits, george.burgess.iv, chandlerc
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60833
llvm-svn: 360270
diff --git a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
index bde4eca..bec5af5 100644
--- a/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInterchange.cpp
@@ -1362,9 +1362,11 @@
// preheaders do not satisfy those conditions.
if (isa<PHINode>(OuterLoopPreHeader->begin()) ||
!OuterLoopPreHeader->getUniquePredecessor())
- OuterLoopPreHeader = InsertPreheaderForLoop(OuterLoop, DT, LI, true);
+ OuterLoopPreHeader =
+ InsertPreheaderForLoop(OuterLoop, DT, LI, nullptr, true);
if (InnerLoopPreHeader == OuterLoop->getHeader())
- InnerLoopPreHeader = InsertPreheaderForLoop(InnerLoop, DT, LI, true);
+ InnerLoopPreHeader =
+ InsertPreheaderForLoop(InnerLoop, DT, LI, nullptr, true);
// Adjust the loop preheader
BasicBlock *InnerLoopHeader = InnerLoop->getHeader();