test/SILOptimizer/licm_exclusivity.sil

// RUN: %target-sil-opt -enforce-exclusivity=checked -enable-sil-verify-all %s -licm | %FileCheck %s

sil_stage canonical


import Builtin
import Swift

struct X {
  @_hasStorage var i: Int64 { get set }
  init(i: Int64)
  init()
}

var globalX: X

sil_global hidden @globalX : $X


sil hidden_external [global_init] @globalAddressor : $@convention(thin) () -> Builtin.RawPointer

// public func hoist_access_with_conflict() {
// Tests Hoisting of begin/end access when there's a "sandwiched" unidentified access
//
// CHECK-LABEL: sil @hoist_access_with_conflict : $@convention(thin) () -> () {
// CHECK: [[GLOBAL:%.*]] = global_addr @globalX : $*X
// CHECK: [[BEGIN:%.*]] = begin_access [read] [dynamic] [[GLOBAL]] : $*X
// CHECK-NEXT: br bb1
// CHECK: apply
// CHECK: load
// CHECK: cond_br
// CHECK: bb2
// CHECK: end_access [[BEGIN]]
// CHECK-LABEL: } // end sil function 'hoist_access_with_conflict'
sil @hoist_access_with_conflict : $@convention(thin) () -> () {
bb0:
  %0 = global_addr @globalX: $*X
  %u0 = function_ref @globalAddressor : $@convention(thin) () -> Builtin.RawPointer
  br bb1
  
bb1:
  %u3 = begin_access [read] [dynamic] %0 : $*X
  %u1 = apply %u0() : $@convention(thin) () -> Builtin.RawPointer
  %u4 = load %u3 : $*X
  end_access %u3 : $*X
  cond_br undef, bb1, bb2

bb2:
  %10 = tuple ()
  return %10 : $()
}

// public func dont_hoist_access_with_conflict() {
// Tests *not* hoisting begin/end access when there's an unidentified access not protected by them
//
// CHECK-LABEL: sil @dont_hoist_access_with_conflict : $@convention(thin) () -> () {
// CHECK: [[GLOBAL:%.*]] = global_addr @globalX : $*X
// CHECK: br bb1
// CHECK: apply
// CHECK-NEXT: [[BEGIN:%.*]] = begin_access [read] [dynamic] [[GLOBAL]] : $*X
// CHECK-NEXT: load
// CHECK-NEXT: end_access [[BEGIN]]
// CHECK-LABEL: } // end sil function 'dont_hoist_access_with_conflict'
sil @dont_hoist_access_with_conflict : $@convention(thin) () -> () {
bb0:
  %0 = global_addr @globalX: $*X
  %u0 = function_ref @globalAddressor : $@convention(thin) () -> Builtin.RawPointer
  br bb1
  
bb1:
  %u1 = apply %u0() : $@convention(thin) () -> Builtin.RawPointer
  %u3 = begin_access [read] [dynamic] %0 : $*X
  %u4 = load %u3 : $*X
  end_access %u3 : $*X
  cond_br undef, bb1, bb2

bb2:
  %10 = tuple ()
  return %10 : $()
}

// public func hoist_access_with_may_release() {
// Tests Hoisting of begin/end access when there's a "sandwiched" MayRelease instruction
//
// CHECK-LABEL: sil @hoist_access_with_may_release : $@convention(thin) () -> () {
// CHECK: [[GLOBAL:%.*]] = global_addr @globalX : $*X
// CHECK: [[BEGIN:%.*]] = begin_access [read] [dynamic] [[GLOBAL]] : $*X
// CHECK-NEXT: br bb1
// CHECK: apply
// CHECK: load
// CHECK: cond_br
// CHECK: bb2
// CHECK: end_access [[BEGIN]]
// CHECK-LABEL: } // end sil function 'hoist_access_with_may_release'
sil @hoist_access_with_may_release : $@convention(thin) () -> () {
bb0:
  %alloc = alloc_box ${ var Int32 }, var, name "y"
  %0 = global_addr @globalX: $*X
  %u0 = function_ref @globalAddressor : $@convention(thin) () -> Builtin.RawPointer
  br bb1
  
bb1:
  %u3 = begin_access [read] [dynamic] %0 : $*X
  %u1 = apply %u0() : $@convention(thin) () -> Builtin.RawPointer
  %u4 = load %u3 : $*X
  strong_release %alloc : ${ var Int32 }
  end_access %u3 : $*X
  cond_br undef, bb1, bb2

bb2:
  %10 = tuple ()
  return %10 : $()
}

// public func dont_hoist_access_with_may_release() {
// Tests *not* hoisting begin/end access when there's a MayRelease not protected by them
//
// CHECK-LABEL: sil @dont_hoist_access_with_may_release : $@convention(thin) () -> () {
// CHECK: [[GLOBAL:%.*]] = global_addr @globalX : $*X
// CHECK: br bb1
// CHECK: [[BEGIN:%.*]] = begin_access [read] [dynamic] [[GLOBAL]] : $*X
// CHECK-NEXT: apply
// CHECK-NEXT: load
// CHECK-NEXT: end_access [[BEGIN]]
// CHECK-LABEL: } // end sil function 'dont_hoist_access_with_may_release'
sil @dont_hoist_access_with_may_release : $@convention(thin) () -> () {
bb0:
  %alloc = alloc_box ${ var Int32 }, var, name "y"
  %0 = global_addr @globalX: $*X
  %u0 = function_ref @globalAddressor : $@convention(thin) () -> Builtin.RawPointer
  br bb1
  
bb1:
  %u3 = begin_access [read] [dynamic] %0 : $*X
  %u1 = apply %u0() : $@convention(thin) () -> Builtin.RawPointer
  %u4 = load %u3 : $*X
  end_access %u3 : $*X
  strong_release %alloc : ${ var Int32 }
  cond_br undef, bb1, bb2

bb2:
  %10 = tuple ()
  return %10 : $()
}