1 files changed, 15 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/WinEHPrepare.cpp b/llvm/lib/CodeGen/WinEHPrepare.cpp
index e573f3e7f41..35b944ea309 100644
--- a/llvm/lib/CodeGen/WinEHPrepare.cpp
+++ b/llvm/lib/CodeGen/WinEHPrepare.cpp
@@ -306,6 +306,11 @@ FunctionPass *llvm::createWinEHPass(const TargetMachine *TM) {
   return new WinEHPrepare(TM);
 }
 
+// FIXME: Remove this once the backend can handle the prepared IR.
+static cl::opt<bool>
+    SEHPrepare("sehprepare", cl::Hidden,
+               cl::desc("Prepare functions with SEH personalities"));
+
 bool WinEHPrepare::runOnFunction(Function &Fn) {
   SmallVector<LandingPadInst *, 4> LPads;
   SmallVector<ResumeInst *, 4> Resumes;
@@ -329,6 +334,16 @@ bool WinEHPrepare::runOnFunction(Function &Fn) {
 
   DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
 
+  if (isAsynchronousEHPersonality(Personality) && !SEHPrepare) {
+    // Replace all resume instructions with unreachable.
+    // FIXME: Remove this once the backend can handle the prepared IR.
+    for (ResumeInst *Resume : Resumes) {
+      IRBuilder<>(Resume).CreateUnreachable();
+      Resume->eraseFromParent();
+    }
+    return true;
+  }
+
   // If there were any landing pads, prepareExceptionHandlers will make changes.
   prepareExceptionHandlers(Fn, LPads);
   return true;