[NFC][CVP] Add one switch testcase

Author: junparser

llvm/test/Transforms/CorrelatedValuePropagation/basic.ll

@@ -377,6 +377,40 @@ unreachable:
   ret void
 }
 
+define i32 @switch_range(i32 %cond) {
+; CHECK-LABEL: @switch_range(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[S:%.*]] = urem i32 [[COND:%.*]], 3
+; CHECK-NEXT:    [[S1:%.*]] = add nuw nsw i32 [[S]], 1
+; CHECK-NEXT:    switch i32 [[S1]], label [[UNREACHABLE:%.*]] [
+; CHECK-NEXT:    i32 1, label [[EXIT1:%.*]]
+; CHECK-NEXT:    i32 2, label [[EXIT2:%.*]]
+; CHECK-NEXT:    i32 3, label [[EXIT1]]
+; CHECK-NEXT:    ]
+; CHECK:       exit1:
+; CHECK-NEXT:    ret i32 1
+; CHECK:       exit2:
+; CHECK-NEXT:    ret i32 2
+; CHECK:       unreachable:
+; CHECK-NEXT:    ret i32 0
+;
+entry:
+  %s = urem i32 %cond, 3
+  %s1 = add i32 %s, 1
+  switch i32 %s1, label %unreachable [
+  i32 1, label %exit1
+  i32 2, label %exit2
+  i32 3, label %exit1
+  ]
+
+exit1:
+  ret i32 1
+exit2:
+  ret i32 2
+unreachable:
+  ret i32 0
+}
+
 define i1 @arg_attribute(i8* nonnull %a) {
 ; CHECK-LABEL: @arg_attribute(
 ; CHECK-NEXT:    ret i1 false