test/SILOptimizer/dead_array_elim.sil

// RUN: %target-sil-opt -enable-sil-verify-all -deadobject-elim %s | FileCheck %s

// Linux doesn't have the same symbol name for _ArrayBuffer.
// XFAIL: linux

import Swift
import Builtin

//////////
// Data //
//////////

class TrivialDestructor {
  var int : Builtin.Int32
  var ptr : Builtin.NativeObject
  init()
  deinit { }
}

// Remove a dead array.
// rdar://20980377 Add dead array elimination to DeadObjectElimination
// Swift._allocateUninitializedArray <A> (Builtin.Word) -> (Swift.Array<A>, Builtin.RawPointer)
sil [_semantics "array.uninitialized"] @allocArray : $@convention(thin) <τ_0_0> (Builtin.Word) -> @owned (Array<τ_0_0>, Builtin.RawPointer)

// CHECK-LABEL: sil @deadarray
// CHECK-NOT: apply
// CHECK-NOT: store
// CHECK: strong_retain
// CHECK-NEXT: strong_release
// CHECK-NEXT: strong_release
// CHECK-NEXT: tuple ()
// CHECK-NEXT: return
sil @deadarray : $@convention(thin) (@owned TrivialDestructor) -> () {
bb0(%0 : $TrivialDestructor):
  %2 = integer_literal $Builtin.Word, 2
  // function_ref Swift._allocateUninitializedArray <A> (Builtin.Word) -> (Swift.Array<A>, Builtin.RawPointer)
  %3 = function_ref @allocArray : $@convention(thin) <τ_0_0> (Builtin.Word) -> @owned (Array<τ_0_0>, Builtin.RawPointer)
  %4 = apply %3<TrivialDestructor>(%2) : $@convention(thin) <τ_0_0> (Builtin.Word) -> @owned (Array<τ_0_0>, Builtin.RawPointer)
  %5 = tuple_extract %4 : $(Array<TrivialDestructor>, Builtin.RawPointer), 0
  %6 = tuple_extract %4 : $(Array<TrivialDestructor>, Builtin.RawPointer), 1
  %7 = pointer_to_address %6 : $Builtin.RawPointer to $*TrivialDestructor
  store %0 to %7 : $*TrivialDestructor
  %9 = integer_literal $Builtin.Word, 1
  %10 = index_addr %7 : $*TrivialDestructor, %9 : $Builtin.Word
  store %0 to %10 : $*TrivialDestructor
  %13 = struct_extract %5 : $Array<TrivialDestructor>, #Array._buffer
  %14 = struct_extract %13 : $_ArrayBuffer<TrivialDestructor>, #_ArrayBuffer._storage
  %15 = struct_extract %14 : $_BridgeStorage<_ContiguousArrayStorageBase, _NSArrayCoreType>, #_BridgeStorage.rawValue
  strong_retain %0 : $TrivialDestructor
  strong_release %15 : $Builtin.BridgeObject
  %18 = tuple ()
  return %18 : $()
}