[LoopVectorize] Don't copy std::vector in for-range loop.

llvm-svn: 279233

diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index c5183f6..3796072 100644 (file)
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -227,7 +227,7 @@ static bool hasCyclesInLoopBody(const Loop &L) {
   if (!L.empty())
     return true;
 
-  for (const auto SCC :
+  for (const auto &SCC :
        make_range(scc_iterator<Loop, LoopBodyTraits>::begin(L),
                   scc_iterator<Loop, LoopBodyTraits>::end(L))) {
     if (SCC.size() > 1) {