// RUN: %target-swift-frontend -O -emit-ir %s | %FileCheck %s
//
// Test LLVM ARC Optimization

// REQUIRES: objc_interop

sil_stage canonical

import Builtin

typealias AnyObject = Builtin.AnyObject

sil @getObject : $@convention(thin) <T where T : AnyObject> () -> T

// Test swift_getObjCClassFromObject side-effects. It reads the object
// argument. A release cannot be hoisted above it.
//
// CHECK-LABEL: define {{.*}}swiftcc %objc_class* @testGetObjCClassFromObjectSideEffect(%swift.type* %T)
// CHECK:     entry:
// CHECK-NEXT:  %0 = tail call swiftcc %objc_object* @getObject(%swift.type* %T)
// CHECK-NEXT:  %.Type = tail call %objc_class* @swift_getObjCClassFromObject(%objc_object* %0)
// CHECK-NEXT:  tail call void @swift_unknownObjectRelease(%objc_object* %0)
// CHECK:       ret %objc_class* %.Type
// CHECK:     }
sil @testGetObjCClassFromObjectSideEffect : $@convention(thin) <T where T : AnyObject> () -> @objc_metatype T.Type {
bb0:
  %f = function_ref @getObject : $@convention(thin) <τ_0_0 where τ_0_0 : AnyObject> () -> τ_0_0
  %obj = apply %f<T>() : $@convention(thin) <τ_0_0 where τ_0_0 : AnyObject> () -> τ_0_0
  %mt = value_metatype $@objc_metatype T.Type, %obj : $T
  // Do not hoist this release.
  strong_release %obj : $T
  return %mt : $@objc_metatype T.Type
}