if (Instruction *I = dyn_cast<Instruction>(V))
Builder.SetInsertPoint(I);
- // record the pointers that were handled in this run, so that they can be
- // cleaned later if something fails
- SeenVals.insert(V);
-
// now compute the size and offset
SizeOffsetEvalType Result;
- if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
+
+ // Record the pointers that were handled in this run, so that they can be
+ // cleaned later if something fails. We also use this set to break cycles that
+ // can occur in dead code.
+ if (!SeenVals.insert(V)) {
+ Result = unknown();
+ } else if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
Result = visitGEPOperator(*GEP);
} else if (Instruction *I = dyn_cast<Instruction>(V)) {
Result = visit(*I);
%4 = load i64* %3, align 8
ret i64 %4
}
+
+; PR17402
+; CHECK-LABEL: @f13
+define void @f13() nounwind {
+entry:
+ br label %alive
+
+dead:
+ ; Self-refential GEPs can occur in dead code.
+ %incdec.ptr = getelementptr inbounds i32* %incdec.ptr, i64 1
+ ; CHECK: %incdec.ptr = getelementptr inbounds i32* %incdec.ptr
+ %l = load i32* %incdec.ptr
+ br label %alive
+
+alive:
+ ret void
+}