/// switches out of repeated 'if' conditions.
bool JumpThreading::ProcessSwitchOnDuplicateCond(BasicBlock *PredBB,
BasicBlock *DestBB) {
+ // Can't thread edge to self.
+ if (PredBB == DestBB)
+ return false;
+
+
SwitchInst *PredSI = cast<SwitchInst>(PredBB->getTerminator());
SwitchInst *DestSI = cast<SwitchInst>(DestBB->getTerminator());
--- /dev/null
+; RUN: llvm-as < %s | opt -jump-threading | llvm-dis
+; PR3353
+
+define i32 @test(i8 %X) {
+entry:
+ %Y = add i8 %X, 1
+ %Z = add i8 %Y, 1
+ br label %bb33.i
+
+bb33.i: ; preds = %bb33.i, %bb32.i
+ switch i8 %Y, label %bb32.i [
+ i8 39, label %bb35.split.i
+ i8 13, label %bb33.i
+ ]
+
+bb35.split.i:
+ ret i32 5
+bb32.i:
+ ret i32 1
+}
+