std::vector<BasicBlock*> BackedgeBlocks;
for (pred_iterator I = pred_begin(Header), E = pred_end(Header); I != E; ++I){
BasicBlock *P = *I;
+
+ // Indirectbr edges cannot be split, so we must fail if we find one.
+ if (isa<IndirectBrInst>(P->getTerminator()))
+ return 0;
+
if (P != Preheader) BackedgeBlocks.push_back(P);
}
--- /dev/null
+; RUN: opt -loopsimplify -S < %s | FileCheck %s
+
+; LoopSimplify shouldn't split loop backedges that use indirectbr.
+
+; CHECK: bb1: ; preds = %bb5, %bb
+; CHECK-NEXT: indirectbr
+
+; CHECK: bb5: ; preds = %bb1
+; CHECK-NEXT: br label %bb1{{$}}
+
+define void @foo(i8* %p) nounwind {
+bb:
+ br label %bb1
+
+bb1: ; preds = %bb5, %bb1, %bb
+ indirectbr i8* %p, [label %bb6, label %bb7, label %bb1, label %bb2, label %bb3, label %bb5, label %bb4]
+
+bb2: ; preds = %bb1
+ ret void
+
+bb3: ; preds = %bb1
+ ret void
+
+bb4: ; preds = %bb1
+ ret void
+
+bb5: ; preds = %bb1
+ br label %bb1
+
+bb6: ; preds = %bb1
+ ret void
+
+bb7: ; preds = %bb1
+ ret void
+}