LoopSink: Don't sink into blocks without an insertion point (PR38462)

In the PR, LoopSink was trying to sink into a catchswitch block, which
doesn't have a valid insertion point.

Differential Revision: https://reviews.llvm.org/D51307

llvm-svn: 340900

1 files changed, 8 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopSink.cpp b/llvm/lib/Transforms/Scalar/LoopSink.cpp
index 240d727d1e2..67bcbdca185 100644
--- a/llvm/lib/Transforms/Scalar/LoopSink.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopSink.cpp
@@ -152,6 +152,14 @@ findBBsToSinkInto(const Loop &L, const SmallPtrSetImpl<BasicBlock *> &UseBBs,
     }
   }
 
+  // Can't sink into blocks that have no valid insertion point.
+  for (BasicBlock *BB : BBsToSinkInto) {
+    if (BB->getFirstInsertionPt() == BB->end()) {
+      BBsToSinkInto.clear();
+      break;
+    }
+  }
+
   // If the total frequency of BBsToSinkInto is larger than preheader frequency,
   // do not sink.
   if (adjustedSumFreq(BBsToSinkInto, BFI) >