Switch lowering: cluster adjacent fall-through cases even at -O0

It's cheap to do, and codegen is much faster if cases can be merged
into clusters.

llvm-svn: 236905

1 files changed, 5 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 52d12fcea31..832437c33f4 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -8012,10 +8012,12 @@ void SelectionDAGBuilder::visitSwitch(const SwitchInst &SI) {
 
   MachineBasicBlock *DefaultMBB = FuncInfo.MBBMap[SI.getDefaultDest()];
 
-  if (TM.getOptLevel() != CodeGenOpt::None) {
-    // Cluster adjacent cases with the same destination.
-    sortAndRangeify(Clusters);
+  // Cluster adjacent cases with the same destination. We do this at all
+  // optimization levels because it's cheap to do and will make codegen faster
+  // if there are many clusters.
+  sortAndRangeify(Clusters);
 
+  if (TM.getOptLevel() != CodeGenOpt::None) {
     // Replace an unreachable default with the most popular destination.
     // FIXME: Exploit unreachable default more aggressively.
     bool UnreachableDefault =