const_fold_objc_bridge.sil

// RUN: %target-sil-opt -assume-parsing-unqualified-ownership-sil -enable-sil-verify-all %s -performance-constant-propagation | %FileCheck %s

// REQUIRES: objc_interop

sil_stage canonical

import Builtin
import Swift
import Foundation

@objc class ObjCClass {}

struct Str: _ObjectiveCBridgeable {
  func _bridgeToObjectiveC() -> ObjCClass
  static func _forceBridgeFromObjectiveC(_ source: ObjCClass,
                                         result: inout Str?)
  static func _conditionallyBridgeFromObjectiveC(_ source: ObjCClass,
                                         result: inout Str?) -> Bool
  static func _unconditionallyBridgeFromObjectiveC(_ source: ObjCClass?) -> Str

  // Make it a non-trivial type
  var x: AnyObject?
}

// CHECK-LABEL: sil @checked_cast_with_take_always
// CHECK: [[A:%[0-9]+]] = alloc_stack
// CHECK: [[S:%[0-9]+]] = load %0
// CHECK-NOT: retain
// CHECK: [[D:%[0-9]+]] = apply %{{[0-9]+}}([[S]])
// CHECK: release_value [[S]]
// CHECK: store [[D]] to [[A]]
// CHECK: bb1:
// CHECK-NEXT: br bb3
// CHECK: bb2:
// CHECK-NEXT: br bb3
// CHECK: return
sil @checked_cast_with_take_always : $@convention(thin) (@in Str) -> ObjCClass {
bb0(%0 : $*Str):
  %b = alloc_stack $ObjCClass
  checked_cast_addr_br take_always Str in %0 : $*Str to ObjCClass in %b : $*ObjCClass, bb1, bb2

bb1:
  br bb3

bb2:
  br bb3

bb3:
  %r = load %b : $*ObjCClass
  dealloc_stack %b : $*ObjCClass
  return %r : $ObjCClass
}

// CHECK-LABEL: sil @checked_cast_with_take_on_success
// CHECK: [[A:%[0-9]+]] = alloc_stack
// CHECK: [[S:%[0-9]+]] = load %0
// CHECK-NOT: retain
// CHECK: [[D:%[0-9]+]] = apply %{{[0-9]+}}([[S]])
// CHECK-NOT: release
// CHECK: store [[D]] to [[A]]
// CHECK: bb1:
// CHECK-NEXT: release_value [[S]]
// CHECK-NEXT: br bb3
// CHECK: bb2:
// CHECK-NEXT: br bb3
// CHECK: return
sil @checked_cast_with_take_on_success : $@convention(thin) (@in Str) -> ObjCClass {
bb0(%0 : $*Str):
  %b = alloc_stack $ObjCClass
  checked_cast_addr_br take_on_success Str in %0 : $*Str to ObjCClass in %b : $*ObjCClass, bb1, bb2

bb1:
  br bb3

bb2:
  br bb3

bb3:
  %r = load %b : $*ObjCClass
  dealloc_stack %b : $*ObjCClass
  return %r : $ObjCClass
}

// CHECK-LABEL: sil @checked_cast_with_copy_on_success
// CHECK: [[A:%[0-9]+]] = alloc_stack
// CHECK: [[S:%[0-9]+]] = load %0
// CHECK: retain_value [[S]]
// CHECK: [[D:%[0-9]+]] = apply %{{[0-9]+}}([[S]])
// CHECK: release_value [[S]]
// CHECK: bb1:
// CHECK-NEXT: br bb3
// CHECK: bb2:
// CHECK-NEXT: br bb3
// CHECK: return
sil @checked_cast_with_copy_on_success : $@convention(thin) (@in Str) -> ObjCClass {
bb0(%0 : $*Str):
  %b = alloc_stack $ObjCClass
  checked_cast_addr_br copy_on_success Str in %0 : $*Str to ObjCClass in %b : $*ObjCClass, bb1, bb2

bb1:
  br bb3

bb2:
  br bb3

bb3:
  %r = load %b : $*ObjCClass
  dealloc_stack %b : $*ObjCClass
  return %r : $ObjCClass
}