test/SILOptimizer/cowarray_opt.sil

// RUN: %target-sil-opt -enforce-exclusivity=none -enable-sil-verify-all -cowarray-opt %s | %FileCheck %s

// Declare this SIL to be canonical because some tests break raw SIL
// conventions. e.g. address-type block args. -enforce-exclusivity=none is also
// required to allow address-type block args in canonical SIL.
sil_stage canonical

import Builtin
import Swift

/////////////
// Utility //
/////////////

struct ArrayIntBuffer {
  var storage : Builtin.NativeObject
}

struct MyArray<T> {
  var buffer : ArrayIntBuffer
}

struct MyStruct {
}

class MyArrayContainer<T> {
  var array: MyArray<T>

  init()
  deinit
}

struct Container {
  var array: MyArray<MyStruct>
}

struct ContainerContainer {
  var container: Container
}

class MyArrayStorage {
  @_hasStorage var header: Int

  init()
  deinit
}

sil [_semantics "array.make_mutable"] @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
sil [_semantics "array.get_count"] @guaranteed_array_get_count : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
sil [_semantics "array.get_capacity"] @guaranteed_array_get_capacity : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
sil [_semantics "array.mutate_unknown"] @array_unknown_mutate : $@convention(method) (@inout MyArray<MyStruct>) -> ()

// An unknown user
sil @unknown : $@convention(thin) () -> ()

///////////
// Tests //
///////////

// CHECK-LABEL: sil @simple_hoist
// CHECK: bb0([[ARRAY:%[0-9]+]]
// CHECK: [[FUN:%[0-9]+]] = function_ref @array_make_mutable
// CHECK: apply [[FUN]]([[ARRAY]]
// CHECK: bb1
// CHECK-NOT: array_make_mutable
// CHECK-NOT: apply [[FUN]]
sil @simple_hoist : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  debug_value_addr %0 : $*MyArray<MyStruct>
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}


// CHECK-LABEL: sil @hoist_ignoring_paired_retain_release_and_hoist
// CHECK: bb0(
// CHECK-NOT: br bb
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK-NOT: br bb
// CHECK: apply [[MM]]
// CHECK: br bb1
// CHECK: bb1:
// CHECK-NOT: apply
// CHECK:  cond_br {{.*}}, bb1
sil @hoist_ignoring_paired_retain_release_and_hoist : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  retain_value %2 : $MyArray<MyStruct>
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  release_value %2 : $MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_blocked_by_unpaired_retain_release_1
// CHECK: bb0(
// CHECK-NOT: apply
// CHECK: bb1:
// CHECK: retain_value
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK: apply [[MM]]
// CHECK:  cond_br {{.*}}, bb1
sil @hoist_blocked_by_unpaired_retain_release_1 : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  retain_value %2 : $MyArray<MyStruct>
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_blocked_by_unpaired_retain_release_2
// CHECK: bb0(
// CHECK-NOT: apply
// CHECK: bb1:
// CHECK: retain_value
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK: apply [[MM]]
// CHECK:  cond_br {{.*}}, bb1
sil @hoist_blocked_by_unpaired_retain_release_2 : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  br bb1

bb1:
  %10 = load %0 : $*MyArray<MyStruct>
  %11 = load %0 : $*MyArray<MyStruct>
  %8 = struct_extract  %10 : $MyArray<MyStruct>, #MyArray.buffer
  %9 = struct_extract  %11 : $MyArray<MyStruct>, #MyArray.buffer
  retain_value %8 : $ArrayIntBuffer
  retain_value %9 : $ArrayIntBuffer
  release_value %9 : $ArrayIntBuffer
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_not_blocked_by_unpaired_release
// CHECK: bb0(
// CHECK-NOT: br bb
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK-NOT: br bb
// CHECK: apply [[MM]]
// CHECK: br bb1
// CHECK: bb1:
// CHECK-NOT: apply
// CHECK:  cond_br {{.*}}, bb1
sil @hoist_not_blocked_by_unpaired_release : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  release_value %2 : $MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @dont_hoist_if_executed_conditionally
// CHECK: bb0({{.*}}):
// CHECK-NOT: apply
// CHECK: bb1({{.*}}):
// CHECK: bb2:
// CHECK:   apply
// CHECK: bb3:
sil @dont_hoist_if_executed_conditionally : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> MyArray<MyStruct> {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  debug_value_addr %0 : $*MyArray<MyStruct>
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1(%2 : $MyArray<MyStruct>)

bb1(%p1 : $MyArray<MyStruct>):
  cond_br undef, bb2, bb3

bb2:
  // If this block is never taken, then hoisting to bb0 would change the value of %p3.
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %7 = load %0 : $*MyArray<MyStruct>
  br bb4(%7 : $MyArray<MyStruct>)

bb3:
  br bb4(%p1 : $MyArray<MyStruct>)

bb4(%p2 : $MyArray<MyStruct>):
  cond_br undef, bb1(%p2 : $MyArray<MyStruct>), bb5(%p2 : $MyArray<MyStruct>)

bb5(%p3 : $MyArray<MyStruct>):
  return %p3 : $MyArray<MyStruct>
}

// CHECK-LABEL: sil @cow_should_ignore_mark_dependence_addrproj_use : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
// CHECK: bb0(
// CHECK-NOT: br bb
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK-NOT: br bb
// CHECK: apply [[MM]]
// CHECK: br bb1
// CHECK: bb1:
// CHECK-NOT: apply
// CHECK:  cond_br {{.*}}, bb1
sil @cow_should_ignore_mark_dependence_addrproj_use : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %999 = struct_element_addr %0 : $*MyArray<MyStruct>, #MyArray.buffer
  %9999 = struct_element_addr %999 : $*ArrayIntBuffer, #ArrayIntBuffer.storage
  %99999 = load %9999 : $*Builtin.NativeObject
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  retain_value %2 : $MyArray<MyStruct>
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  release_value %2 : $MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  mark_dependence %1 : $*Builtin.Int1 on %99999 : $Builtin.NativeObject
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @cow_should_ignore_mark_dependence_value : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
// CHECK: bb0(
// CHECK-NOT: br bb
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK-NOT: br bb
// CHECK: apply [[MM]]
// CHECK: br bb1
// CHECK: bb1:
// CHECK-NOT: apply
// CHECK:  cond_br {{.*}}, bb1
sil @cow_should_ignore_mark_dependence_value : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  retain_value %2 : $MyArray<MyStruct>
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  release_value %2 : $MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  mark_dependence %1 : $*Builtin.Int1 on %2 : $MyArray<MyStruct>
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @cow_should_ignore_enum : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
// CHECK: bb0(
// CHECK-NOT: br bb
// CHECK: [[MM:%.*]] = function_ref @array_make_mutable
// CHECK-NOT: br bb
// CHECK: apply [[MM]]
// CHECK: br bb1
// CHECK: bb1:
// CHECK-NOT: apply
// CHECK:  cond_br {{.*}}, bb1
sil @cow_should_ignore_enum : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  retain_value %2 : $MyArray<MyStruct>
  %3 = load %1 : $*Builtin.Int1
  %4 = load %0 : $*MyArray<MyStruct>
  release_value %2 : $MyArray<MyStruct>
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %8 = enum $Optional<MyArray<MyStruct>>, #Optional.some!enumelt.1, %2 : $MyArray<MyStruct>
  mark_dependence %1 : $*Builtin.Int1 on %8 : $Optional<MyArray<MyStruct>>
  cond_br %3, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @cow_should_ignore_guaranteed_semantic_call_sequence : $@convention(thin) (@guaranteed MyArrayContainer<MyStruct>, Builtin.NativeObject) -> () {
// CHECK: bb0
// CHECK: [[F:%.*]] = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
// CHECK: apply [[F]](
// CHECK: bb1:
// CHECK: bb2:
// CHECK-NOT: apply [[F]](
// CHECK: bb3:
// CHECK: bb4:
// CHECK-NOT: apply [[F]](
// CHECK: bb5:
// CHECK: bb6:
// CHECK-NOT: apply [[F]](
// CHECK: bb7:
// CHECK: bb8:
// CHECK-NOT: apply [[F]](
// CHECK: bb9:
sil @cow_should_ignore_guaranteed_semantic_call_sequence : $@convention(thin) (@guaranteed MyArrayContainer<MyStruct>, Builtin.NativeObject) -> () {
bb0(%0 : $MyArrayContainer<MyStruct>, %00 : $Builtin.NativeObject):
  %1 = ref_element_addr %0 : $MyArrayContainer<MyStruct>, #MyArrayContainer.array
  %2 = load %1 : $*MyArray<MyStruct>
  %3 = function_ref @guaranteed_array_get_count : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  %4 = function_ref @guaranteed_array_get_capacity : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  %5 = function_ref @unknown : $@convention(thin) () -> ()
  %6 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  br bb1

bb1:
  // Simple case. This should hoist.
  retain_value %2 : $MyArray<MyStruct>
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  br bb3

bb3:
  // Failure case b/c of use in between release and call.
  retain_value %2 : $MyArray<MyStruct>
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  fix_lifetime %0 : $MyArrayContainer<MyStruct>
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb4, bb3

bb4:
  br bb5

bb5:
  // Failure case b/c of use in between calls.
  retain_value %2 : $MyArray<MyStruct>
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  fix_lifetime %0 : $MyArrayContainer<MyStruct>
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb5, bb6

bb6:
  br bb7

bb7:
  // Failure b/c use is in between apply and retain.
  retain_value %2 : $MyArray<MyStruct>
  fix_lifetime %0 : $MyArrayContainer<MyStruct>
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb7, bb8

bb8:
  br bb9

bb9:
  // Failure b/c of release_value
  retain_value %00 : $Builtin.NativeObject
  retain_value %2 : $MyArray<MyStruct>
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  release_value %00 : $Builtin.NativeObject
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb9, bb10

bb10:
  %7 = tuple()
  return %7 : $()
}

// CHECK: sil @cow_handle_array_address_load
// CHECK: bb0({{.*}}):
// CHECK:   apply
// CHECK: br bb1
// CHECK: bb1:
// CHECK-NOT: apply
// CHECK: bb2

sil @cow_handle_array_address_load : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Int1) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Int1):
  %2 = load %0 : $*MyArray<MyStruct>
  %3 = struct_element_addr %0 : $*MyArray<MyStruct>, #MyArray.buffer
  %4 = struct_element_addr %3 : $*ArrayIntBuffer, #ArrayIntBuffer.storage
  br bb1

bb1:
  %6 = load %4 : $*Builtin.NativeObject
  strong_retain %6 : $Builtin.NativeObject
  %8 = load %1 : $*Builtin.Int1
  strong_release %6 : $Builtin.NativeObject
  %10 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %11 = apply %10(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %12 = enum $Optional<MyArray<MyStruct>>, #Optional.some!enumelt.1, %2 : $MyArray<MyStruct>
  %13 = mark_dependence %1 : $*Builtin.Int1 on %12 : $Optional<MyArray<MyStruct>>
  cond_br %8, bb1, bb2

bb2:
  %15 = tuple ()
  return %15 : $()
}

// CHECK-LABEL: sil @cow_type_based_hoisting_retain_release_matching : $@convention(thin) (@guaranteed MyArrayContainer<MyStruct>, Builtin.NativeObject) -> () {
// CHECK: bb0
// CHECK: [[F:%.*]] = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
// CHECK-NOT: apply [[F]](
// CHECK: bb1:
// CHECK: apply [[F]](
// CHECK: bb2:
// CHECK-NOT: apply [[F]](
// CHECK: bb3:
// CHECK: apply [[F]](
// CHECK: bb4:

sil @cow_type_based_hoisting_retain_release_matching : $@convention(thin) (@guaranteed MyArrayContainer<MyStruct>, Builtin.NativeObject) -> () {
bb0(%0 : $MyArrayContainer<MyStruct>, %00 : $Builtin.NativeObject):
  %1 = ref_element_addr %0 : $MyArrayContainer<MyStruct>, #MyArrayContainer.array
  %2 = load %1 : $*MyArray<MyStruct>
  %3 = function_ref @guaranteed_array_get_count : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  %4 = function_ref @guaranteed_array_get_capacity : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  %5 = function_ref @unknown : $@convention(thin) () -> ()
  %6 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %7 = function_ref @array_unknown_mutate : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  br bb1

bb1:
  retain_value %2 : $MyArray<MyStruct>
  retain_value %00 : $Builtin.NativeObject
  release_value %00: $Builtin.NativeObject
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  br bb3

bb3:
  retain_value %2 : $MyArray<MyStruct>
  apply %7(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  apply %3(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  apply %4(%2) : $@convention(method) (@guaranteed MyArray<MyStruct>) -> Int
  release_value %2 : $MyArray<MyStruct>
  apply %6(%1) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb3, bb4

bb4:
  %8 = tuple()
  return %8 : $()
}

struct _MyBridgeStorage {
  var rawValue : Builtin.BridgeObject
}

struct _My2dArrayBuffer<T> {
  var _storage : _MyBridgeStorage
}

struct My2dArray<T> {
  var _buffer : _My2dArrayBuffer<T>
}


struct MyInt {
  @_hasStorage var _value: Builtin.Int64
  init(_ value: Int16)
}

// CHECK-LABEL: sil @hoist_projections
// CHECK: bb0([[CONTAINER:%[0-9]+]]
// CHECK: [[CONTAINER2:%.*]] = struct_element_addr [[CONTAINER]] : $*ContainerContainer
// CHECK: [[ARRAY:%.*]] = struct_element_addr [[CONTAINER2]] : $*Container,
// CHECK: [[FUN:%[0-9]+]] = function_ref @array_make_mutable
// CHECK: apply [[FUN]]([[ARRAY]]
// CHECK: bb1
// CHECK-NOT: array_make_mutable
// CHECK-NOT: apply [[FUN]]
sil @hoist_projections : $@convention(thin) (@inout ContainerContainer, @inout Builtin.Int1) -> () {
bb0(%0 : $*ContainerContainer, %1 : $*Builtin.Int1):
  br bb1

bb1:
  %2 = struct_element_addr %0 : $*ContainerContainer, #ContainerContainer.container
  br bb3(%2 : $*Container)

bb3(%3: $*Container):
  %4 = struct_element_addr %3 : $*Container, #Container.array
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%4) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_non_unary_projections
// CHECK: index_addr
// CHECK: struct_element_addr
// CHECK: bb1:
// CHECK-NOT: index_addr
// CHECK-NOT: struct_element_addr
sil @hoist_non_unary_projections : $@convention(thin) (@inout ContainerContainer, @inout Builtin.Int1) -> () {
bb0(%0 : $*ContainerContainer, %1 : $*Builtin.Int1):
  %i = integer_literal $Builtin.Int32, 0
  br bb1

bb1:
  %2 = struct_element_addr %0 : $*ContainerContainer, #ContainerContainer.container
  br bb2(%2 : $*Container)

bb2(%3: $*Container):
  %3i = index_addr %3 : $*Container, %i : $Builtin.Int32
  %4 = struct_element_addr %3i : $*Container, #Container.array
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%4) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb3

bb3:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_projections2
// CHECK: bb0([[CONTAINER:%[0-9]+]]
// CHECK: [[CONTAINER2:%.*]] = struct_element_addr [[CONTAINER]] : $*ContainerContainer
// CHECK: [[ARRAY:%.*]] = struct_element_addr [[CONTAINER2]] : $*Container,
// CHECK: [[FUN:%[0-9]+]] = function_ref @array_make_mutable
// CHECK: apply [[FUN]]([[ARRAY]]
// CHECK: bb1
// CHECK-NOT: array_make_mutable
// CHECK-NOT: apply [[FUN]]
sil @hoist_projections2 : $@convention(thin) (@inout ContainerContainer, @inout Builtin.Int1) -> () {
bb0(%0 : $*ContainerContainer, %1 : $*Builtin.Int1):
  br bb1

bb1:
  %2 = struct_element_addr %0 : $*ContainerContainer, #ContainerContainer.container
  %3 = struct_element_addr %2 : $*Container, #Container.array
  br bb3(%3 : $*MyArray<MyStruct>)

bb3(%4 : $*MyArray<MyStruct>):
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%4) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_projections3
// CHECK: bb0([[CONTAINER:%[0-9]+]]
// CHECK: [[CONTAINER2:%.*]] = struct_element_addr [[CONTAINER]] : $*ContainerContainer
// CHECK: [[ARRAY:%.*]] = struct_element_addr [[CONTAINER2]] : $*Container,
// CHECK: [[FUN:%[0-9]+]] = function_ref @array_make_mutable
// CHECK: apply [[FUN]]([[ARRAY]]
// CHECK: bb1
// CHECK-NOT: array_make_mutable
// CHECK-NOT: apply [[FUN]]
sil @hoist_projections3 : $@convention(thin) (@inout ContainerContainer, @inout Builtin.Int1) -> () {
bb0(%0 : $*ContainerContainer, %1 : $*Builtin.Int1):
  br bb1

bb1:
  %2 = struct_element_addr %0 : $*ContainerContainer, #ContainerContainer.container
  %3 = struct_element_addr %2 : $*Container, #Container.array
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%3) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %7 = tuple()
  return %7 : $()
}

// CHECK-LABEL: sil @hoist_array2d
// CHECK:      bb0({{.*}}):
// CHECK:        apply
// CHECK-NEXT:   load
// CHECK-NEXT:   struct_extract
// CHECK-NEXT:   struct_extract
// CHECK-NEXT:   unchecked_ref_cast
// CHECK-NEXT:   ref_tail_addr
// CHECK-NEXT:   index_addr
// CHECK-NEXT:   apply
// CHECK-NEXT:   br bb1
// CHECK:      bb1:
// CHECK-NOT:    apply
sil @hoist_array2d : $@convention(thin) (@inout MyArray<MyStruct>) -> () {
bb0(%0 : $*MyArray<MyStruct>):
  %2 = load %0 : $*MyArray<MyStruct>
  %3 = integer_literal $Builtin.Word, 1
  br bb1

bb1:
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %7 = load %0 : $*MyArray<MyStruct>
  %8 = struct_extract  %7 : $MyArray<MyStruct>, #MyArray.buffer
  %9 = struct_extract  %8 : $ArrayIntBuffer, #ArrayIntBuffer.storage
  %10 = unchecked_ref_cast %9 : $Builtin.NativeObject to $MyArrayStorage
  %11 = ref_tail_addr %10 : $MyArrayStorage, $MyArray<MyStruct>
  %12 = index_addr %11 : $*MyArray<MyStruct>, %3 : $Builtin.Word
  %13 = apply %5(%12) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %r = tuple()
  return %r : $()
}

// CHECK-LABEL: sil @dont_hoist_inner_mutating_outer
// CHECK:     bb0({{.*}}):
// CHECK:       apply
// CHECK-NOT:   apply
// CHECK:     bb1:
// CHECK:       apply
// CHECK:       apply
// CHECK-NOT:   apply
// CHECK:       return
sil @dont_hoist_inner_mutating_outer : $@convention(thin) (@inout MyArray<MyStruct>) -> () {
bb0(%0 : $*MyArray<MyStruct>):
  %2 = load %0 : $*MyArray<MyStruct>
  %3 = integer_literal $Builtin.Word, 1
  %4 = function_ref @array_unknown_mutate : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  br bb1

bb1:
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %7 = load %0 : $*MyArray<MyStruct>
  %8 = struct_extract  %7 : $MyArray<MyStruct>, #MyArray.buffer
  %9 = struct_extract  %8 : $ArrayIntBuffer, #ArrayIntBuffer.storage
  %10 = unchecked_ref_cast %9 : $Builtin.NativeObject to $MyArrayStorage
  %11 = ref_tail_addr %10 : $MyArrayStorage, $MyArray<MyStruct>
  %12 = index_addr %11 : $*MyArray<MyStruct>, %3 : $Builtin.Word
  %13 = apply %5(%12) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  apply %4(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %r = tuple()
  return %r : $()
}

// CHECK-LABEL: sil @dont_hoist_inner_variant_index
// CHECK:     bb0({{.*}}):
// CHECK:       apply
// CHECK-NOT:   apply
// CHECK:     bb1:
// CHECK:       apply
// CHECK-NOT:   apply
// CHECK:       return
sil @dont_hoist_inner_variant_index : $@convention(thin) (@inout MyArray<MyStruct>, @inout Builtin.Word) -> () {
bb0(%0 : $*MyArray<MyStruct>, %1 : $*Builtin.Word):
  %2 = load %0 : $*MyArray<MyStruct>
  br bb1

bb1:
  %4 = load %1 : $*Builtin.Word
  %5 = function_ref @array_make_mutable : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %6 = apply %5(%0) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  %7 = load %0 : $*MyArray<MyStruct>
  %8 = struct_extract  %7 : $MyArray<MyStruct>, #MyArray.buffer
  %9 = struct_extract  %8 : $ArrayIntBuffer, #ArrayIntBuffer.storage
  %10 = unchecked_ref_cast %9 : $Builtin.NativeObject to $MyArrayStorage
  %11 = ref_tail_addr %10 : $MyArrayStorage, $MyArray<MyStruct>
  %12 = index_addr %11 : $*MyArray<MyStruct>, %4 : $Builtin.Word
  %13 = apply %5(%12) : $@convention(method) (@inout MyArray<MyStruct>) -> ()
  cond_br undef, bb1, bb2

bb2:
  %r = tuple()
  return %r : $()
}