// RUN: %target-swift-frontend -primary-file %s -gnone -emit-ir | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-%target-ptrsize

// REQUIRES: CPU=x86_64

sil_stage canonical

import Swift

sil hidden @test_helper : $@convention(thin) () -> () {
bb0:
  %0 = tuple ()
  return %0 : $()
}

// CHECK-64:  define hidden void @test1([[WORD:i64]], [[WORD]])
// CHECK-32:  define hidden void @test1([[WORD:i32]], [[WORD]])
sil hidden @test1 : $@convention(thin) (@owned Optional<() -> ()>) -> () {
bb0(%0 : $Optional<() -> ()>):
  // CHECK: [[T0:%.*]] = icmp eq [[WORD]] %0, 0
  // CHECK: br i1 [[T0]], label
  // CHECK: [[FNPTR:%.*]] = inttoptr [[WORD]] %0 to i8*
  // CHECK: [[CTX:%.*]] = inttoptr [[WORD]] %1 to %swift.refcounted*
  // CHECK: call void @rt_swift_retain(%swift.refcounted* [[CTX]])
  // CHECK: br label
  retain_value %0 : $Optional<() -> ()>
  
  // CHECK: icmp eq i64 %0, 0
  switch_enum %0 : $Optional<() -> ()>, case #Optional.some!enumelt.1: bb1, case #Optional.none!enumelt: bb2

  // CHECK: [[FNPTR:%.*]] = inttoptr [[WORD]] %0 to i8*
  // CHECK: [[CTX:%.*]] = inttoptr [[WORD]] %1 to %swift.refcounted*
  // CHECK: br label
  // CHECK: [[FNPTR2:%.*]] = phi i8* [ [[FNPTR]], {{%.*}} ]
  // CHECK: [[CTX2:%.*]] = phi %swift.refcounted* [ [[CTX]], {{%.*}} ]
bb1(%1 : $@callee_owned (@in ()) -> @out ()):
  %2 = alloc_stack $()
  %3 = alloc_stack $()

  // CHECK: [[FNPTR3:%.*]] = bitcast i8* [[FNPTR2]] to void (%swift.opaque*, %swift.opaque*, %swift.refcounted*)*
  // CHECK: call void [[FNPTR3]](%swift.opaque* noalias nocapture sret undef, %swift.opaque* noalias nocapture undef, %swift.refcounted* [[CTX2]])
  apply %1(%3, %2) : $@callee_owned (@in ()) -> @out ()
  dealloc_stack %3 : $*()
  dealloc_stack %2 : $*()
  // CHECK: br label [[CONT:%[0-9]+]]
  br bb3

bb2:
  %4 = function_ref @test_helper : $@convention(thin) () -> ()
  apply %4() : $@convention(thin) () -> ()
  // CHECK: call void @test_helper()
  // CHECK: br label [[CONT]]
  br bb3

bb3:
  %5 = tuple ()
  // CHECK: ret void
  return %5 : $()
}