// RUN: %target-sil-opt -enable-sil-verify-all %s -sil-opt-pass-count=1.1 -simplification -simplify-instruction=br | %FileCheck %s

// REQUIRES: swift_in_compiler

import Swift
import Builtin

// Check that branch simplification doesn't leave empty blocks.
// -sil-opt-pass-count=1.1  prevents dead block elimination which would hide the problem.



// CHECK-LABEL: sil @dont_leave_empty_blocks
// CHECK:       bb0(%0 : $Builtin.Int64):
// CHECK-NEXT:    br bb1
// CHECK:       bb1:
// CHECK-NEXT:    return %0
// CHECK:       } // end sil function 'dont_leave_empty_blocks'
sil @dont_leave_empty_blocks : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
bb0(%0 : $Builtin.Int64):
  br bb1

bb1:
  br bb2

bb2:
  return %0 : $Builtin.Int64
}