; CHECK-NEXT: [[R:%.+]] = select i1 %cmp
; CHECK-NEXT: ret i32 [[R]]
}
+
+define void @pr20210(i8 %x, i1 %y) {
+; %z has uses outside of its BB or the phi it feeds into,
+; so doing a table lookup and jumping directly to while.cond would
+; cause %z to cease dominating all its uses.
+
+entry:
+ br i1 %y, label %sw, label %intermediate
+
+sw:
+ switch i8 %x, label %end [
+ i8 7, label %intermediate
+ i8 3, label %intermediate
+ i8 2, label %intermediate
+ i8 1, label %intermediate
+ i8 0, label %intermediate
+ ]
+
+intermediate:
+ %z = zext i8 %x to i32
+ br label %while.cond
+
+while.cond:
+ %i = phi i32 [ %z, %intermediate ], [ %j, %while.body ]
+ %b = icmp ne i32 %i, 7
+ br i1 %b, label %while.body, label %while.end
+
+while.body:
+ %j = add i32 %i, 1
+ br label %while.cond
+
+while.end:
+ call void @exit(i32 %z)
+ unreachable
+
+end:
+ ret void
+; CHECK-LABEL: @pr20210
+; CHECK: switch i8 %x
+}