+
+; If we can build a lookup table without any holes, we don't need a default result.
+declare void @exit(i32)
+define i32 @nodefaultnoholes(i32 %c) {
+entry:
+ switch i32 %c, label %sw.default [
+ i32 0, label %return
+ i32 1, label %sw.bb1
+ i32 2, label %sw.bb2
+ i32 3, label %sw.bb3
+ ]
+
+sw.bb1: br label %return
+sw.bb2: br label %return
+sw.bb3: br label %return
+sw.default: call void @exit(i32 1)
+ unreachable
+return:
+ %x = phi i32 [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
+ ret i32 %x
+
+; CHECK-LABEL: @nodefaultnoholes(
+; CHECK: @switch.table
+; CHECK-NOT: switch i32
+}
+
+; This lookup table will have holes, so we cannot build it without default result.
+define i32 @nodefaultwithholes(i32 %c) {
+entry:
+ switch i32 %c, label %sw.default [
+ i32 0, label %return
+ i32 1, label %sw.bb1
+ i32 2, label %sw.bb2
+ i32 3, label %sw.bb3
+ i32 5, label %sw.bb3
+ ]
+
+sw.bb1: br label %return
+sw.bb2: br label %return
+sw.bb3: br label %return
+sw.default: call void @exit(i32 1)
+ unreachable
+return:
+ %x = phi i32 [ -1, %sw.bb3 ], [ 0, %sw.bb2 ], [ 123, %sw.bb1 ], [ 55, %entry ]
+ ret i32 %x
+
+; CHECK-LABEL: @nodefaultwithholes(
+; CHECK-NOT: @switch.table
+; CHECK: switch i32
+}