test/SILOptimizer/copyforward.sil

// RUN: %target-sil-opt -assume-parsing-unqualified-ownership-sil -enable-sil-verify-all %s -copy-forwarding -enable-copyforwarding -enable-destroyhoisting | %FileCheck %s

sil_stage canonical

import Builtin
import Swift

class AClass {}
sil @f_in : $@convention(thin) <T> (@in T) -> ()
sil @f_in_guaranteed : $@convention(thin) <T> (@in_guaranteed T) -> ()
sil @f_out : $@convention(thin) <T> () -> @out T
sil @f_owned : $@convention(thin) <T> (@owned T) -> ()

protocol P {
  init(_ i : Int32)
  mutating func poke()
};

// CHECK-LABEL: nrvo
// CHECK-NOT: copy_addr
// CHECK: return
sil hidden @nrvo : $@convention(thin) <T where T : P> (Bool) -> @out T {
bb0(%0 : $*T, %1 : $Bool):
  %2 = alloc_stack $T, var, name "ro"                 // users: %9, %15, %17, %19
  debug_value_addr %0 : $*T
  debug_value_addr %2 : $*T
  %3 = struct_extract %1 : $Bool, #Bool._value     // user: %4
  cond_br %3, bb1, bb2                            // id: %4

bb1:                                              // Preds: bb0
  %5 = metatype $@thick T.Type                    // user: %9
  %6 = witness_method $T, #P.init!allocator.1 : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (Int32, @thick τ_0_0.Type) -> @out τ_0_0 // user: %9
  %7 = integer_literal $Builtin.Int32, 10          // user: %8
  %8 = struct $Int32 (%7 : $Builtin.Int32)           // user: %9
  %9 = apply %6<T>(%2, %8, %5) : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (Int32, @thick τ_0_0.Type) -> @out τ_0_0
  br bb3                                          // id: %10

bb2:                                              // Preds: bb0
  %11 = metatype $@thick T.Type                   // user: %15
  %12 = witness_method $T, #P.init!allocator.1 : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (Int32, @thick τ_0_0.Type) -> @out τ_0_0 // user: %15
  %13 = integer_literal $Builtin.Int32, 1          // user: %14
  %14 = struct $Int32 (%13 : $Builtin.Int32)         // user: %15
  %15 = apply %12<T>(%2, %14, %11) : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (Int32, @thick τ_0_0.Type) -> @out τ_0_0
  br bb3                                          // id: %16

bb3:                                              // Preds: bb1 bb2
  copy_addr [take] %2 to [initialization] %0 : $*T // id: %17
  %18 = tuple ()                                  // user: %20
  debug_value_addr %0 : $*T
  debug_value_addr %2 : $*T
  dealloc_stack %2 : $*T         // id: %19
  return %18 : $()                                // id: %20
}


// CHECK-LABEL: dont_assert_nrvo
// CHECK: return

sil hidden @dont_assert_nrvo : $@convention(thin) <T where T : P> (Bool) -> @out T {
bb0(%0 : $*T, %1 : $Bool):
  %2 = alloc_stack $T, var, name "ro"                 // users: %9, %15, %17, %19
  debug_value_addr %0 : $*T
  debug_value_addr %2 : $*T
  %3 = struct_extract %1 : $Bool, #Bool._value     // user: %4
  %5 = metatype $@thick T.Type                    // user: %9
  %6 = witness_method $T, #P.init!allocator.1 : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (Int32, @thick τ_0_0.Type) -> @out τ_0_0 // user: %9
  %7 = integer_literal $Builtin.Int32, 10          // user: %8
  %8 = struct $Int32 (%7 : $Builtin.Int32)           // user: %9
  %9 = apply %6<T>(%2, %8, %5) : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (Int32, @thick τ_0_0.Type) -> @out τ_0_0
  br bb3(%0 : $*T)

bb3(%10 : $*T):                                              // Preds: bb1 bb2
  copy_addr [take] %2 to [initialization] %10 : $*T // id: %17
  %18 = tuple ()                                  // user: %20
  debug_value_addr %0 : $*T
  debug_value_addr %2 : $*T
  dealloc_stack %2 : $*T         // id: %19
  return %18 : $()                                // id: %20
}

//CHECK-LABEL: forward_init
//CHECK-NOT: copy_addr
//CHECK-NOT: destroy_addr
//CHECK: return
sil hidden @forward_init : $@convention(thin) <T> (@in T) -> () {
bb0(%0 : $*T):
  debug_value_addr %0 : $*T
  %l1 = alloc_stack $T
  copy_addr %0 to [initialization] %l1 : $*T
  %f1 = function_ref @f_in : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  debug_value_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  debug_value_addr %0 : $*T
  destroy_addr %0 : $*T
  %r1 = tuple ()
  return %r1 : $()
}

//CHECK-LABEL: dont_assert_on_basic_block_arg
//CHECK: return
sil hidden @dont_assert_on_basic_block_arg : $@convention(thin) <T> (@in T) -> () {
bb0(%0 : $*T):
  debug_value_addr %0 : $*T
  br bb1(%0: $*T)

bb1(%1 : $*T):
  %l1 = alloc_stack $T
  copy_addr %1 to [initialization] %l1 : $*T
  %f1 = function_ref @f_in : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  debug_value_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  debug_value_addr %0 : $*T
  destroy_addr %0 : $*T
  %r1 = tuple ()
  return %r1 : $()
}

//CHECK-LABEL: forward_noinit
//CHECK-NOT: copy_addr
//CHECK: destroy_addr
//CHECK: return
sil hidden @forward_noinit : $@convention(thin) <T> (@in T) -> () {
bb0(%0 : $*T):
  debug_value_addr %0 : $*T
  %l1 = alloc_stack $T
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  copy_addr %0 to %l1 : $*T
  debug_value_addr %l1 : $*T
  debug_value_addr %0 : $*T
  %f2 = function_ref @f_in : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  %c2 = apply %f2<T>(%l1) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  dealloc_stack %l1 : $*T
  destroy_addr %0 : $*T
  %r1 = tuple ()
  return %r1 : $()
}

//CHECK-LABEL: forward_takeinit
//CHECK-NOT: copy_addr
//CHECK-NOT: destroy_addr
//CHECK: return
sil hidden @forward_takeinit : $@convention(thin) <T> (@in T) -> () {
bb0(%0 : $*T):
  debug_value_addr %0 : $*T
  %l1 = alloc_stack $T
  copy_addr [take] %0 to [initialization] %l1 : $*T
  %f1 = function_ref @f_in : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %r1 = tuple ()
  return %r1 : $()
}

//CHECK-LABEL: forward_takenoinit
//CHECK-NOT: copy_addr
//CHECK: destroy_addr
//CHECK: return
sil hidden @forward_takenoinit : $@convention(thin) <T> (@in T) -> () {
bb0(%0 : $*T):
  debug_value_addr %0 : $*T
  %l1 = alloc_stack $T
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  copy_addr [take] %0 to %l1 : $*T
  %f2 = function_ref @f_in : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  %c2 = apply %f2<T>(%l1) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %r1 = tuple ()
  return %r1 : $()
}

//CHECK-LABEL: backward_init
//CHECK-NOT: copy_addr
//CHECK-NOT: destroy_addr
//CHECK: return
sil hidden @backward_init : $@convention(thin) <T> () -> @out T {
bb0(%0 : $*T):
  %l1 = alloc_stack $T
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  copy_addr %l1 to [initialization] %0 : $*T
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  destroy_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %t = tuple ()
  return %t : $()
}

//CHECK-LABEL: dont_assert_backward_init
//CHECK: return
sil hidden @dont_assert_backward_init : $@convention(thin) <T> () -> @out T {
bb0(%0 : $*T):
  %l1 = alloc_stack $T
br bb1(%0: $*T)

bb1(%1 : $*T):
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  copy_addr %l1 to [initialization] %0 : $*T
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  destroy_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %t = tuple ()
  return %t : $()
}
//CHECK-LABEL: backward_noinit
//CHECK: copy_addr
//CHECK: destroy_addr
//CHECK: return
sil hidden @backward_noinit : $@convention(thin) <T> () -> @out T {
bb0(%0 : $*T):
  %l1 = alloc_stack $T
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%0) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c2 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  copy_addr %l1 to %0 : $*T
  destroy_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %t = tuple ()
  return %t : $()
}


//CHECK-LABEL: backward_takeinit
//CHECK-NOT: copy_addr
//CHECK-NOT: destroy_addr
//CHECK: return
sil hidden @backward_takeinit : $@convention(thin) <T> () -> @out T {
bb0(%0 : $*T):
  %l1 = alloc_stack $T
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  copy_addr [take] %l1 to [initialization] %0 : $*T
  debug_value_addr %0 : $*T
  debug_value_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %t = tuple ()
  return %t : $()
}

//CHECK-LABEL: backward_takenoinit
//CHECK: copy_addr
//CHECK-NOT: destroy_addr
//CHECK: return
sil hidden @backward_takenoinit : $@convention(thin) <T> () -> @out T {
bb0(%0 : $*T):
  %l1 = alloc_stack $T
  %f1 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c1 = apply %f1<T>(%0) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  %c2 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  copy_addr [take] %l1 to %0 : $*T
  dealloc_stack %l1 : $*T
  %t = tuple ()
  return %t : $()
}

//CHECK-LABEL: branch
//CHECK-NOT: copy_addr
//CHECK: return
sil hidden @branch : $@convention(thin) <T> (@in T, Bool) -> () {
bb0(%0 : $*T, %1 : $Bool):
  %2 = struct_extract %1 : $Bool, #Bool._value     // user: %3
  cond_br %2, bb1, bb2                            // id: %3

bb1:                                              // Preds: bb0
  %4 = function_ref @f_in : $@convention(thin) <τ_0_0> (@in τ_0_0) -> () // user: %7
  %5 = alloc_stack $T                             // users: %6, %7, %8
  copy_addr %0 to [initialization] %5 : $*T     // id: %6
  %7 = apply %4<T>(%5) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
  dealloc_stack %5 : $*T         // id: %8
  br bb2                                          // id: %9

bb2:                                              // Preds: bb0 bb1
  destroy_addr %0 : $*T                           // id: %10
  %11 = tuple ()                                  // user: %12
  return %11 : $()                                // id: %12
}

enum A<T> {
  case Val(T)
  init(_ val: T)
}

sil [transparent] @_TFO8enuminit1A3ValU__fMGS0_Q__FQ_GS0_Q__ : $@convention(thin) <T> (@in T, @thin A<T>.Type) -> @out A<T>

//CHECK-LABEL: enuminit
//CHECK-NOT: copy_addr
//CHECK: return
sil @enuminit : $@convention(thin) <T> (@in T, @thin A<T>.Type) -> @out A<T> {
bb0(%0 : $*A<T>, %1 : $*T, %2 : $@thin A<T>.Type):
  %3 = alloc_stack $A<T>, var, name "sf"             // users: %10, %14, %16
  // function_ref enuminit.A.Val <A>(enuminit.A<A>.Type)(A) -> enuminit.A<A>
  %4 = function_ref @_TFO8enuminit1A3ValU__fMGS0_Q__FQ_GS0_Q__ : $@convention(thin) <τ_0_0> (@in τ_0_0, @thin A<τ_0_0>.Type) -> @out A<τ_0_0> // user: %9
  %5 = metatype $@thin A<T>.Type                  // user: %9
  %6 = alloc_stack $T                             // users: %7, %9, %12
  copy_addr %1 to [initialization] %6 : $*T     // id: %7
  %8 = alloc_stack $A<T>                          // users: %9, %10, %11
  %9 = apply %4<T>(%8, %6, %5) : $@convention(thin) <τ_0_0> (@in τ_0_0, @thin A<τ_0_0>.Type) -> @out A<τ_0_0>
  copy_addr [take] %8 to [initialization] %3 : $*A<T> // id: %10
  dealloc_stack %8 : $*A<T>      // id: %11
  dealloc_stack %6 : $*T         // id: %12
  destroy_addr %1 : $*T                           // id: %13
  copy_addr [take] %3 to [initialization] %0 : $*A<T> // id: %14
  %15 = tuple ()                                  // user: %17
  dealloc_stack %3 : $*A<T>      // id: %16
  return %15 : $()                                // id: %17
}

//CHECK-LABEL: make_addronly
//CHECK-NOT: copy_addr
//CHECK: return
sil hidden @make_addronly : $@convention(thin) <T> () -> @out T {
bb0(%0 : $*T):
  %1 = alloc_stack $T, let, name "t"                   // users: %3, %4, %5
  %2 = function_ref @f_out : $@convention(thin) <τ_0_0> () -> @out τ_0_0 // user: %3
  %3 = apply %2<T>(%1) : $@convention(thin) <τ_0_0> () -> @out τ_0_0
  copy_addr [take] %1 to [initialization] %0 : $*T // id: %4
  dealloc_stack %1 : $*T         // id: %5
  %6 = tuple ()                                   // user: %7
  return %6 : $()                                 // id: %7
}

sil @_TFSq4someU__fMGSqQ__FQ_GSqQ__ : $@convention(thin) <τ_0_0> (@in τ_0_0, @thin Optional<τ_0_0>.Type) -> @out Optional<τ_0_0>

sil @_TFsoi2neU__FTGSqQ__Vs26_OptionalNilComparisonType_Sb : $@convention(thin) <τ_0_0> (@in Optional<τ_0_0>, _OptionalNilComparisonType) -> Bool

//CHECK-LABEL: option_init
//CHECK: alloc_stack
//CHECK: alloc_stack
//CHECK: alloc_stack
//CHECK: copy_addr
//CHECK: copy_addr
//CHECK-NOT: copy_addr
//CHECK: alloc_stack
//CHECK: alloc_stack
//CHECK: copy_addr
//CHECK-NOT: copy_addr
//CHECK: alloc_stack
//CHECK-NOT: copy_addr
//CHECK: copy_addr
//CHECK-NOT: copy_addr
//CHECK: alloc_stack
//CHECK-NOT: copy_addr
//CHECK: return
sil hidden @option_init : $@convention(thin) <T> (@in AnyObject) -> () {
bb0(%0 : $*AnyObject):
  %g0 = alloc_stack $IteratorOverOne<AnyObject> // 831
  %s0 = struct_element_addr %g0 : $*IteratorOverOne<AnyObject>, #IteratorOverOne._elements

  %l0 = alloc_stack $Optional<AnyObject>
  // function_ref Swift.Optional.some <A>(Swift.Optional<A>.Type)(A) -> Swift.Optional<A>
  %f0 = function_ref @_TFSq4someU__fMGSqQ__FQ_GSqQ__ : $@convention(thin) <τ_0_0> (@in τ_0_0, @thin Optional<τ_0_0>.Type) -> @out Optional<τ_0_0>
  %t0 = metatype $@thin Optional<AnyObject>.Type
  %i0 = apply %f0<AnyObject>(%l0, %0, %t0) : $@convention(thin) <τ_0_0> (@in τ_0_0, @thin Optional<τ_0_0>.Type) -> @out Optional<τ_0_0>

  %g1 = alloc_stack $IteratorOverOne<AnyObject> // 850
  %s1 = struct_element_addr %g1 : $*IteratorOverOne<AnyObject>, #IteratorOverOne._elements
  // We can't backward propagate this yet because we can't analyze struct_element_addr copy dest.
  copy_addr [take] %l0 to [initialization] %s1 : $*Optional<AnyObject>
  // We ignore this copy because its Def is used by struct_element_addr
  copy_addr [take] %g1 to [initialization] %g0 : $*IteratorOverOne<AnyObject>

  %l1 = alloc_stack $Optional<AnyObject> // 869

  %l2 = alloc_stack $Optional<AnyObject> // 873
  // We ignore this copy because its Def is used by struct_element_addr
  copy_addr %s0 to [initialization] %l2 : $*Optional<AnyObject>

  %l3 = alloc_stack $Optional<AnyObject> // 877
  %o1 = enum $Optional<AnyObject>, #Optional.none!enumelt
  store %o1 to %l3 : $*Optional<AnyObject>
  // We can't backward propagate this yet because we can't analyze struct_element_addr copy dest.
  copy_addr [take] %l3 to %s0 : $*Optional<AnyObject>
  dealloc_stack %l3 : $*Optional<AnyObject>
  // We can't forward propagate this because l2 is deallocated, but we can backward propagate l1.
  copy_addr [take] %l2 to [initialization] %l1 : $*Optional<AnyObject>
  dealloc_stack %l2 : $*Optional<AnyObject>
  %l4 = alloc_stack $Optional<AnyObject> // 889
  %o2 = load %l1 : $*Optional<AnyObject>
  store %o2 to %l4 : $*Optional<AnyObject>
  %s5 = struct $_OptionalNilComparisonType ()
  retain_value %o2 : $Optional<AnyObject>

  %f1 = function_ref @_TFsoi2neU__FTGSqQ__Vs26_OptionalNilComparisonType_Sb : $@convention(thin) <τ_0_0> (@in Optional<τ_0_0>, _OptionalNilComparisonType) -> Bool
  %c5 = apply %f1<AnyObject>(%l4, %s5) : $@convention(thin) <τ_0_0> (@in Optional<τ_0_0>, _OptionalNilComparisonType) -> Bool
  dealloc_stack %l4 : $*Optional<AnyObject>
  destroy_addr %l1 : $*Optional<AnyObject>
  dealloc_stack %l1 : $*Optional<AnyObject>
  dealloc_stack %g1 : $*IteratorOverOne<AnyObject>
  dealloc_stack %l0 : $*Optional<AnyObject>
  destroy_addr %g0 : $*IteratorOverOne<AnyObject>
  dealloc_stack %g0 : $*IteratorOverOne<AnyObject>
  %p0 = tuple ()
  return %p0 : $()
}

// <rdar://problem/19779711> Premature release of optional NSData
// after optimization
//
// Check that destroy is not hoisted above a retain of a transitively
// referenced object.
//
// CHECK-LABEL: load_nontrivial
// CHECK: load %0 : $*Optional<AClass>
// CHECK-NOT: destroy_addr
// CHECK: unchecked_enum_data %{{.*}} : $Optional<AClass>
// CHECK-NOT: destroy_addr
// CHECK: strong_retain %{{.*}} : $AClass
// CHECK: destroy_addr %0
sil hidden @load_nontrivial : $@convention(thin) () -> () {
bb0:
  %v0 = alloc_stack $Optional<AClass>
  %v1 = alloc_stack $Optional<AClass>

  %f0 = function_ref @f_out : $@convention(thin) <A> () -> @out A
  %c0 = apply %f0<AClass?>(%v0) : $@convention(thin) <τ_0_0> () -> @out τ_0_0

  copy_addr %v0 to [initialization] %v1 : $*Optional<AClass>

  %f1 = function_ref @f_in : $@convention(thin) <A> (@in A) -> ()
  %c1 = apply %f1<AClass?>(%v1) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()

  dealloc_stack %v1 : $*Optional<AClass>
  %l1 = load %v0 : $*Optional<AClass>
  %d1 = unchecked_enum_data %l1 : $Optional<AClass>, #Optional.some!enumelt.1
  %f2 = function_ref @f_owned : $@convention(thin) <A> (@owned A) -> ()
  %c2 = apply %f2<AClass>(%d1) : $@convention(thin) <τ_0_0> (@owned τ_0_0) -> ()
  strong_retain %d1 : $AClass
  destroy_addr %v0 : $*Optional<AClass>
  %34 = tuple ()
  dealloc_stack %v0 : $*Optional<AClass>
  return %34 : $()
}

// CHECK-LABEL: sil @nil_comparison
// CHECK:  alloc_stack
// CHECK-NOT: copy_addr
// CHECK-NOT: destroy_addr
// CHECK: switch_enum_addr %0
// CHECK: [[D:%.*]] = unchecked_take_enum_data_addr %0
// CHECK: destroy_addr [[D]]
// CHECK: return
sil @nil_comparison : $@convention(thin) <T> (@in Optional<T>) -> Bool {
bb0(%0 : $*Optional<T>):
  %2 = alloc_stack $Optional<T>
  copy_addr %0 to [initialization] %2 : $*Optional<T>
  destroy_addr %0 : $*Optional<T>
  switch_enum_addr %2 : $*Optional<T>, case #Optional.some!enumelt.1: bb1, case #Optional.none!enumelt: bb2

bb1:
  %6 = unchecked_take_enum_data_addr %2 : $*Optional<T>, #Optional.some!enumelt.1
  destroy_addr %6 : $*T
  %8 = integer_literal $Builtin.Int1, -1
  br bb3(%8 : $Builtin.Int1)

bb2:
  %10 = integer_literal $Builtin.Int1, 0
  br bb3(%10 : $Builtin.Int1)

bb3(%12 : $Builtin.Int1):
  %13 = struct $Bool (%12 : $Builtin.Int1)
  dealloc_stack %2 : $*Optional<T>
  return %13 : $Bool
}

sil @use: $@convention(thin) <T> (@inout T) -> ()

// We currently don't handle reasoning about multiple copy_addr instructions at
// once. With the current logic we must not optimize this case (we would have to
// prove that we can replace both copy_addr to be able to optimize).

// CHECK-LABEL: sil @not_dominated_uses
// CHECK: alloc_stack
// CHECK: cond_br
// CHECK: bb1
// CHECK: copy_addr
// CHECK: apply
// CHECK: br bb3
// CHECK: bb2
// CHECK: copy_addr
// CHECK: apply
// CHECK: br bb3
// CHECK: bb3
// CHECK: apply
// CHECK: destroy_addr

sil @not_dominated_uses: $@convention(thin) <T> (@in Optional<T>, @in Optional<T>, Bool) -> () {
bb0(%0 : $*Optional<T>, %1 : $*Optional<T>, %3 : $Bool):
  %4 = alloc_stack $Optional<T>
  %5 = struct_extract %3 : $Bool, #Bool._value
  %f = function_ref @use : $@convention(thin) <T2> (@inout T2) -> ()
  cond_br %5, bb1, bb2

bb1:
  copy_addr [take] %0 to [initialization] %4 : $*Optional<T>
  %r1 = apply %f<Optional<T>>(%4) : $@convention(thin) <T2> (@inout T2) -> ()
  br bb3

bb2:
  copy_addr [take] %1 to  [initialization] %4 : $*Optional<T>
  %r2 = apply %f<Optional<T>>(%4) : $@convention(thin) <T2> (@inout T2) -> ()
  br bb3

bb3:
  %r3 = apply %f<Optional<T>>(%4) : $@convention(thin) <T2> (@inout T2) -> ()
  destroy_addr %4 : $*Optional<T>
  dealloc_stack %4 : $*Optional<T>
  %13 = tuple()
  return %13 : $()
}

//CHECK-LABEL: test_in_guaranteed
//CHECK: copy_addr %1 to [initialization]
//CHECK-NOT: copy_addr
//CHECK-NOT: destroy_addr
//CHECK: return
sil hidden @test_in_guaranteed : $@convention(thin) <T> (@in T) -> @out T {
bb0(%0 : $*T, %1 : $*T):
  %l1 = alloc_stack $T
  copy_addr %1 to [initialization] %l1 : $*T
  %f1 = function_ref @f_in_guaranteed : $@convention(thin) <τ_0_0> (@in_guaranteed τ_0_0) -> ()
  %c2 = apply %f1<T>(%l1) : $@convention(thin) <τ_0_0> (@in_guaranteed τ_0_0) -> ()
  copy_addr %l1 to [initialization] %0 : $*T
  destroy_addr %l1 : $*T
  dealloc_stack %l1 : $*T
  %t = tuple ()
  return %t : $()
}

// CHECK-LABEL: forward_unchecked_ref_cast_addr
// CHECK: unchecked_ref_cast_addr
// CHECK-NOT: copy_addr
// CHECK: return
sil hidden @forward_unchecked_ref_cast_addr : $@convention(thin) (@in AnyObject) -> @out AClass {
bb0(%0 : $*AClass, %1 : $*AnyObject):
  %3 = alloc_stack $AnyObject                     // user: %10
  %4 = alloc_stack $AnyObject                     // user: %9
  %5 = alloc_stack $AClass                        // users: %6, %7, %8
  unchecked_ref_cast_addr  AnyObject in %1 : $*AnyObject to AClass in %5 : $*AClass // id: %6
  copy_addr [take] %5 to [initialization] %0 : $*AClass // id: %7
  dealloc_stack %5 : $*AClass    // id: %8
  dealloc_stack %4 : $*AnyObject // id: %9
  dealloc_stack %3 : $*AnyObject // id: %10
  %11 = tuple ()                                  // user: %12
  return %11 : $()                                // id: %12
}

sil @element_use : $@convention(thin)  (@inout P) -> ()

// CHECK-LABEL: backward_propagate_enum_init
// CHECK-NOT: copy_addr
// CHECK: %[[TMP:.*]] = init_enum_data_addr %0 : $*Optional<P>
// CHECK: copy_addr %1 to [initialization] %[[TMP]]
// CHECK-NOT: copy_addr
sil @backward_propagate_enum_init : $@convention(thin) (@inout P) -> @out Optional<P> {
bb0(%0 : $*Optional<P>, %1 : $*P):
  %2 = alloc_stack $P
  copy_addr %1 to [initialization] %2 : $*P
  %3 = function_ref @element_use : $@convention(thin)  (@inout P) -> ()
  %4 = apply %3(%1) : $@convention(thin)  (@inout P) -> ()
  %5 = init_enum_data_addr %0 : $*Optional<P>, #Optional.some!enumelt.1
  copy_addr %2 to [initialization] %5 : $*P
  inject_enum_addr %0 : $*Optional<P>, #Optional.some!enumelt.1
  destroy_addr %2 : $*P
  dealloc_stack %2 : $*P
  %27 = tuple ()
  return %27 : $()
}

// CHECK-LABEL: backward_propagate_exi_init
// CHECK-NOT: copy_addr
// CHECK: %[[TMP:.*]] = init_existential_addr %0 : $*P, $T
// CHECK: copy_addr %1 to [initialization] %[[TMP]] : $*T
// CHECK-NOT: copy_addr
sil @backward_propagate_exi_init : $@convention(thin) <T where T : P>(@inout T) -> @out P {
bb0(%0 : $*P, %1 : $*T):
  %2 = alloc_stack $T
  copy_addr %1 to [initialization] %2 : $*T
  %3 = witness_method $T, #P.poke!1 : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (@inout τ_0_0) -> ()
  %4 = apply %3<T>(%1) : $@convention(witness_method) <τ_0_0 where τ_0_0 : P> (@inout τ_0_0) -> ()
  %5 = init_existential_addr %0 : $*P, $T
  copy_addr [take] %2 to [initialization] %5 : $*T
  dealloc_stack %2 : $*T
  %27 = tuple ()
  return %27 : $()
}

public struct S<T> {
  @sil_stored var f: T { get set }
  @sil_stored var g: T { get set }
  init(f: T, g: T)
}

// Test a dead copy that initializes a stack local.
// CHECK-LABEL: deadtemp
// CHECK: %[[G:.*]] = struct_element_addr %0 : $*S<T>, #S.g
// CHECK-NOT: copy_addr
// CHECK: %[[F:.*]] = struct_element_addr %0 : $*S<T>, #S.f
// CHECK: copy_addr %[[G]] to %[[F]] : $*T
// CHECK: return
sil @deadtemp : $@convention(thin) <T> (@inout S<T>) -> () {
bb0(%0 : $*S<T>):
  %1 = struct_element_addr %0 : $*S<T>, #S.g
  %2 = alloc_stack $T
  copy_addr %1 to [initialization] %2 : $*T
  %4 = struct_element_addr %0 : $*S<T>, #S.f
  copy_addr [take] %2 to %4 : $*T
  dealloc_stack %2 : $*T
  %7 = tuple ()
  return %7 : $()
}

// Test assigning into a stack local.
// CHECK-LABEL: deadtemp_assign
// CHECK: %[[G:.*]] = struct_element_addr %0 : $*S<T>, #S.g
// CHECK-NOT: copy_addr
// CHECK: destroy_addr %2 : $*T
// CHECK: %[[F:.*]] = struct_element_addr %0 : $*S<T>, #S.f
// CHECK: copy_addr %[[G]] to %[[F]] : $*T
// CHECK: return
sil @deadtemp_assign : $@convention(thin) <T> (@inout S<T>) -> () {
bb0(%0 : $*S<T>):
  %1 = struct_element_addr %0 : $*S<T>, #S.g
  %2 = alloc_stack $T
  copy_addr %1 to %2 : $*T
  %4 = struct_element_addr %0 : $*S<T>, #S.f
  copy_addr [take] %2 to %4 : $*T
  dealloc_stack %2 : $*T
  %7 = tuple ()
  return %7 : $()
}

// Test a dead copy that initializes a stack local,
// taking the source, and initializing the destination.
// CHECK-LABEL: deadtemp_take_init
// CHECK: %[[G:.*]] = struct_element_addr %0 : $*S<T>, #S.g
// CHECK-NOT: copy_addr
// CHECK: %[[F:.*]] = struct_element_addr %0 : $*S<T>, #S.f
// CHECK: copy_addr [take] %[[G]] to [initialization] %[[F]] : $*T
// CHECK: return
sil @deadtemp_take_init : $@convention(thin) <T> (@inout S<T>) -> () {
bb0(%0 : $*S<T>):
  %1 = struct_element_addr %0 : $*S<T>, #S.g
  %2 = alloc_stack $T
  copy_addr [take] %1 to [initialization] %2 : $*T
  %4 = struct_element_addr %0 : $*S<T>, #S.f
  copy_addr [take] %2 to [initialization] %4 : $*T
  dealloc_stack %2 : $*T
  %7 = tuple ()
  return %7 : $()
}

// Test a dead copy that initializes a stack local and destroy's it later.
// CHECK-LABEL: deadtemp_destroy
// CHECK: %[[G:.*]] = struct_element_addr %0 : $*S<T>, #S.g
// CHECK-NOT: copy_addr
// CHECK: %[[F:.*]] = struct_element_addr %0 : $*S<T>, #S.f
// CHECK: copy_addr %[[G]] to %[[F]] : $*T
// CHECK-NOT: destroy_addr
// CHECK: return
sil @deadtemp_destroy : $@convention(thin) <T> (@inout S<T>) -> () {
bb0(%0 : $*S<T>):
  %1 = struct_element_addr %0 : $*S<T>, #S.g
  %2 = alloc_stack $T
  copy_addr %1 to [initialization] %2 : $*T
  %4 = struct_element_addr %0 : $*S<T>, #S.f
  copy_addr %2 to %4 : $*T
  destroy_addr %2 : $*T
  dealloc_stack %2 : $*T
  %7 = tuple ()
  return %7 : $()
}