// RUN: %target-sil-opt -sil-print-types -enable-sil-verify-all %s -onone-simplification -simplify-instruction=unchecked_ref_cast | %FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-ONONE
// RUN: %target-sil-opt -sil-print-types -enable-sil-verify-all %s -simplification -simplify-instruction=unchecked_ref_cast | %FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-O

// REQUIRES: swift_in_compiler

import Swift
import Builtin

protocol P : AnyObject {}
class B : P {}
class X : B {}

// CHECK-LABEL: sil @test_non_ossa :
// CHECK:         %0 = alloc_ref
// CHECK:         unchecked_ref_cast %0 : $X
// CHECK:       } // end sil function 'test_non_ossa'
sil @test_non_ossa : $@convention(thin) () -> X {
bb0:
  %0 = alloc_ref $X
  %1 = upcast %0 : $X to $B
  %2 = init_existential_ref %1 : $B : $B, $AnyObject
  %3 = unchecked_ref_cast %2 : $AnyObject to $X
  return %3 : $X
}

// CHECK-LABEL: sil [ossa] @test_ossa :
// CHECK:         %0 = alloc_ref
// CHECK-O-NEXT:  unchecked_ref_cast %0 : $X
// CHECK-ONONE:   unchecked_ref_cast %2 : $AnyObject
// CHECK:       } // end sil function 'test_ossa'
sil [ossa] @test_ossa : $@convention(thin) () -> @owned X {
bb0:
  %0 = alloc_ref $X
  %1 = upcast %0 : $X to $B
  %2 = init_existential_ref %1 : $B : $B, $AnyObject
  debug_value %2 : $AnyObject, name "x"
  %4 = unchecked_ref_cast %2 : $AnyObject to $X
  return %4 : $X
}

// CHECK-LABEL: sil [ossa] @test_ossa_multiple_uses :
// CHECK:         unchecked_ref_cast %1 : $B
// CHECK:       } // end sil function 'test_ossa_multiple_uses'
sil [ossa] @test_ossa_multiple_uses : $@convention(thin) () -> @owned X {
bb0:
  %0 = alloc_ref $X
  %1 = upcast %0 : $X to $B
  fix_lifetime %1 : $B
  %3 = unchecked_ref_cast %1 : $B to $X
  return %3 : $X
}

// CHECK-LABEL: sil [ossa] @test_borrow :
// CHECK:         %1 = begin_borrow
// CHECK-NEXT:    %2 = unchecked_ref_cast %1 : $X
// CHECK-NEXT:    fix_lifetime %2
// CHECK:       } // end sil function 'test_borrow'
sil [ossa] @test_borrow : $@convention(thin) () -> () {
bb0:
  %0 = alloc_ref $X
  %1 = begin_borrow %0 : $X
  %2 = upcast %1 : $X to $B
  %3 = init_existential_ref %2 : $B : $B, $P
  %4 = unchecked_ref_cast %3 : $P to $X
  fix_lifetime %4 : $X
  end_borrow %1 : $X
  destroy_value %0: $X
  %8 = tuple ()
  return %8 : $()
}

sil_vtable X {
}