Fix bug: LowerSwitch/2003-08-23-EmptySwitch.ll

llvm-svn: 8087

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Scalar/LowerSwitch.cpp b/llvm/lib/Transforms/Scalar/LowerSwitch.cpp
index c0e9e0dcd33..73ce2f77f92 100644
--- a/llvm/lib/Transforms/Scalar/LowerSwitch.cpp
+++ b/llvm/lib/Transforms/Scalar/LowerSwitch.cpp
@@ -63,6 +63,13 @@ void LowerSwitch::processSwitchInst(SwitchInst *SI) {
   // Unlink the switch instruction from it's block.
   CurBlock->getInstList().remove(SI);
 
+  // If there is only the default destination, don't bother with the code below.
+  if (SI->getNumOperands() == 2) {
+    CurBlock->getInstList().push_back(new BranchInst(SI->getDefaultDest()));
+    delete SI;
+    return;
+  }
+
   // Expand comparisons for all of the non-default cases...
   for (unsigned i = 2, e = SI->getNumOperands(); i != e; i += 2) {
     // Insert a new basic block after the current one...