Propagate nonnull and dereferenceable throught launder

Summary:
invariant.group.launder should not stop propagation
of nonnull and dereferenceable, because e.g. we would not be
able to hoist loads speculatively.

Reviewers: rsmith, amharc, kuhar, xbolva00, hfinkel

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D46972

llvm-svn: 332788

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/lib/Analysis/Loads.cpp b/llvm/lib/Analysis/Loads.cpp
index 10a71de82e3..fda1395cf3e 100644
--- a/llvm/lib/Analysis/Loads.cpp
+++ b/llvm/lib/Analysis/Loads.cpp
@@ -107,11 +107,14 @@ static bool isDereferenceableAndAlignedPointer(
     return isDereferenceableAndAlignedPointer(ASC->getOperand(0), Align, Size,
                                               DL, CtxI, DT, Visited);
 
-  if (auto CS = ImmutableCallSite(V))
+  if (auto CS = ImmutableCallSite(V)) {
     if (const Value *RV = CS.getReturnedArgOperand())
       return isDereferenceableAndAlignedPointer(RV, Align, Size, DL, CtxI, DT,
                                                 Visited);
-
+    if (CS.getIntrinsicID() == Intrinsic::launder_invariant_group)
+      return isDereferenceableAndAlignedPointer(CS->getOperand(0), Align, Size,
+                                                DL, CtxI, DT, Visited);
+  }
   // If we don't know, assume the worst.
   return false;
 }