A BB that unwind_to an "unwind" inst is that same as one that doesn't unwind_to

at all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48096 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Utils/SimplifyCFG.cpp b/lib/Transforms/Utils/SimplifyCFG.cpp
index 61da0d9..846c3bf 100644 (file)
--- a/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -1370,7 +1370,7 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
           new UnwindInst(Pred);            // Use unwind.
           Changed = true;
         }
-      } else if (InvokeInst *II = dyn_cast<InvokeInst>(Pred->getTerminator()))
+      } else if (InvokeInst *II = dyn_cast<InvokeInst>(Pred->getTerminator())) {
         if (II->getUnwindDest() == BB) {
           // Insert a new branch instruction before the invoke, because this
           // is now a fall through...
@@ -1388,6 +1388,9 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
           delete II;
           Changed = true;
         }
+      } else if (Pred->getUnwindDest() == BB) {
+        Pred->setUnwindDest(NULL);
+      }
 
       Preds.pop_back();
     }

diff --git a/test/Transforms/SimplifyCFG/unwindto.ll b/test/Transforms/SimplifyCFG/unwindto.ll
index e42a831..28d9d1e 100644 (file)
--- a/test/Transforms/SimplifyCFG/unwindto.ll
+++ b/test/Transforms/SimplifyCFG/unwindto.ll
@@ -33,3 +33,11 @@ bb4: unwind_to %cleanup
 cleanup:
   ret i32 1
 }
+
+define i32 @f3() {
+entry: unwind_to %cleanup
+  call void @g(i32 0)
+  ret i32 0
+cleanup:
+  unwind
+}