[ExpandMemCmp] Update CFG before DTU

The applyUpdates() API requires that the CFG is already updated,
so make sure to insert the new terminator first.

diff --git a/llvm/lib/CodeGen/ExpandMemCmp.cpp b/llvm/lib/CodeGen/ExpandMemCmp.cpp
index 50fdc21..d0c2b8c 100644 (file)
--- a/llvm/lib/CodeGen/ExpandMemCmp.cpp
+++ b/llvm/lib/CodeGen/ExpandMemCmp.cpp
@@ -348,17 +348,17 @@ void MemCmpExpansion::emitLoadCompareByteBlock(unsigned BlockIndex,
                                     ConstantInt::get(Diff->getType(), 0));
     BranchInst *CmpBr =
         BranchInst::Create(EndBlock, LoadCmpBlocks[BlockIndex + 1], Cmp);
+    Builder.Insert(CmpBr);
     if (DTU)
       DTU->applyUpdates(
           {{DominatorTree::Insert, BB, EndBlock},
            {DominatorTree::Insert, BB, LoadCmpBlocks[BlockIndex + 1]}});
-    Builder.Insert(CmpBr);
   } else {
     // The last block has an unconditional branch to EndBlock.
     BranchInst *CmpBr = BranchInst::Create(EndBlock);
+    Builder.Insert(CmpBr);
     if (DTU)
       DTU->applyUpdates({{DominatorTree::Insert, BB, EndBlock}});
-    Builder.Insert(CmpBr);
   }
 }