OSLogMandatoryOptTest.sil

// RUN: %target-sil-opt -sil-print-types -os-log-optimization -enable-sil-verify-all %s 2>&1 | %FileCheck %s

// SIL tests for the OSLogOptimization pass which performs compile-time analysis
// and optimization of os log APIs. This test checks specific aspects of the
// OSLogOptimization pass on hand-crafted SIL code. The tests here do not depend
// on any library.

import Swift
import Builtin

/// A type that mimics the OSLogInterpolation struct in the tests in this file.
struct OSLogInterpolationStub {
  var formatString: String
}

/// A type that mimics the OSLogMessage struct in the tests in this file.
struct OSLogMessageStub {
  var interpolation: OSLogInterpolationStub
}

/// A stub for OSLogMessage.init.
sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub {
bb0(%0 : @owned $String):
  %1 = struct $OSLogInterpolationStub(%0 : $String)
  %2 = struct $OSLogMessageStub (%1 : $OSLogInterpolationStub)
  return %2 : $OSLogMessageStub
}

// String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
sil [serialized] [always_inline] [readonly] [_semantics "string.makeUTF8"] @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String

/// A function that models the use of a string in some arbitrary way.
sil @useFormatString: $@convention(thin) (@guaranteed String) -> ()

// CHECK-LABEL: @testConstantFoldingOfStructExtract :
// CHECK-DAG: [[STRINGUSE:%[0-9]+]] = function_ref @useFormatString
// CHECK-DAG: {{%.*}} = apply [[STRINGUSE]]([[BORROW:%[0-9]+]])
// CHECK-DAG: [[BORROW]] = begin_borrow [[STRINGCONST:%[0-9]+]]
// CHECK-DAG: [[STRINGCONST]] = apply [[STRINGINIT:%[0-9]+]]([[LIT:%[0-9]+]], {{%.*}}, {{%.*}}, {{%.*}})
// CHECK-DAG: [[STRINGINIT]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
// CHECK-DAG: [[LIT]] = string_literal oslog "test message: %lld"
// CHECK-DAG: destroy_value [[STRINGCONST]] : $String
sil [ossa] @testConstantFoldingOfStructExtract : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "test message: %lld"
  %1 = integer_literal $Builtin.Word, 18
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub

  // Use the formatString property of OSLogMessageStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %8 = begin_borrow %7 : $OSLogMessageStub
  %9 = struct_extract %8 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %10 = struct_extract %9 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  %11 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  %12 = apply %11(%10) : $@convention(thin) (@guaranteed String) -> ()
  end_borrow %8 : $OSLogMessageStub
  destroy_value %7 : $OSLogMessageStub
  %13 = tuple ()
  return %13 : $()
}

/// A function that models the use of a string in some arbitrary way.
sil @useFormatStringIndirect: $@convention(thin) (@in_guaranteed String) -> ()

// CHECK-LABEL: @testBorrowScopeIdentificationUsingStoreBorrow
sil [ossa] @testBorrowScopeIdentificationUsingStoreBorrow : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "some long message: %llx"
  %1 = integer_literal $Builtin.Word, 23
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub

  // Use the formatString property of OSLogMessageStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %8 = begin_borrow %7 : $OSLogMessageStub
  %9 = struct_extract %8 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %10 = struct_extract %9 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  %11 = alloc_stack $String
  %12 = store_borrow %10 to %11 : $*String
  %13 = function_ref @useFormatStringIndirect : $@convention(thin) (@in_guaranteed String) -> ()
  %14 = apply %13(%12) : $@convention(thin) (@in_guaranteed String) -> ()
  end_borrow %12 : $*String
  end_borrow %8 : $OSLogMessageStub
  destroy_value %7 : $OSLogMessageStub
  dealloc_stack %11 : $*String
  %15 = tuple ()
  return %15 : $()
    // CHECK: [[LIT:%[0-9]+]] = string_literal oslog "some long message: %llx"
    // CHECK: [[STRINGINIT:%[0-9]+]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK: [[STRINGCONST:%[0-9]+]] = apply [[STRINGINIT]]([[LIT]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[STRINGCONST]]
    // CHECK: store_borrow [[BORROW]] to {{%.*}} : $*String
    // CHECK: [[STRINGUSE:%[0-9]+]] = function_ref @useFormatStringIndirect
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[STRINGCONST]]
}

// CHECK-LABEL: @testConstantFoldingOfOwnedValue
sil [ossa] @testConstantFoldingOfOwnedValue : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "test message: %lld"
  %1 = integer_literal $Builtin.Word, 18
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub

  // Extract the formatString property of OSLogMessageStub as a owned value and
  // use it. The uses of this owned value should be constant folded.
  %8 = function_ref @extractFormatStringAsOwned : $@convention(thin) (@guaranteed OSLogMessageStub) -> @owned String
  %9 = apply %8(%7) : $@convention(thin) (@guaranteed OSLogMessageStub) -> @owned String
  %11 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  %12 = apply %11(%9) : $@convention(thin) (@guaranteed String) -> ()
  destroy_value %7 : $OSLogMessageStub
  destroy_value %9 : $String
  %13 = tuple ()
  return %13 : $()
    // CHECK-DAG: [[STRINGUSE:%[0-9]+]] = function_ref @useFormatString
    // CHECK-DAG: {{%.*}} = apply [[STRINGUSE]]([[STRINGCONST:%[0-9]+]])
    // CHECK-DAG: [[STRINGCONST]] = apply [[STRINGINIT:%[0-9]+]]([[LIT:%[0-9]+]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK-DAG: [[STRINGINIT]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK-DAG: [[LIT]] = string_literal oslog "test message: %lld"
    // FIXME: function_ref @extractFormatStringAsOwned will not be removed as of
    // now by OSLogOptimization pass even though it is folded as function calls
    // are not dead-code eliminated.
}

sil [ossa] [_semantics "constant_evaluable"] @extractFormatStringAsOwned : $@convention(thin) (@guaranteed OSLogMessageStub) -> @owned String {
bb0(%0 : @guaranteed $OSLogMessageStub):
  %1 = struct_extract %0 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %2 = struct_extract %1 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  %3 = copy_value %2 : $String
  return %3 : $String
}

// CHECK-LABEL: @testConstantFoldingOfDestructureStruct
sil [ossa] @testConstantFoldingOfDestructureStruct : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "test message: %lld"
  %1 = integer_literal $Builtin.Word, 18
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub

  // Destructure the OSLogMessage instance and use the formatString property
  // which should be constant folded by the OSLogOptimization pass.
  (%8) = destructure_struct %7 : $OSLogMessageStub
  (%9) = destructure_struct %8 : $OSLogInterpolationStub
  %10 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  %11 = apply %10(%9) : $@convention(thin) (@guaranteed String) -> ()
  destroy_value %9 : $String
  %12 = tuple ()
  return %12 : $()
    // CHECK-DAG: [[STRINGUSE:%[0-9]+]] = function_ref @useFormatString
    // CHECK-DAG: {{%.*}} = apply [[STRINGUSE]]([[STRINGCONST:%[0-9]+]])
    // CHECK-DAG: [[STRINGCONST]] = apply [[STRINGINIT:%[0-9]+]]([[LIT:%[0-9]+]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK-DAG: [[STRINGINIT]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK-DAG: [[LIT]] = string_literal oslog "test message: %lld"
    // CHECK-DAG: destroy_value [[STRINGCONST]] : $String
}

// Test that the OSLogOptimization pass does not fold instructions that define
// ownership scopes like `begin_borrow`, and `copy_value`.
// CHECK-LABEL: @testNonFoldingOfOwnershipScopes
sil [ossa] @testNonFoldingOfOwnershipScopes : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "test message: %lld"
  %1 = integer_literal $Builtin.Word, 18
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub

  // Use the formatString property of OSLogMessageStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %8 = begin_borrow %7 : $OSLogMessageStub
  %9 = struct_extract %8 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %10 = struct_extract %9 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  %11 = copy_value %10 : $String
  %12 = begin_borrow %11 : $String
  %13 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  %14 = apply %13(%12) : $@convention(thin) (@guaranteed String) -> ()
  end_borrow %12 : $String
  destroy_value %11 : $String
  end_borrow %8 : $OSLogMessageStub
  destroy_value %7 : $OSLogMessageStub
  %15 = tuple ()
  return %15 : $()
    // CHECK-DAG: [[STRINGUSE:%[0-9]+]] = function_ref @useFormatString
    // CHECK-DAG: {{%.*}} = apply [[STRINGUSE]]([[BORROW:%[0-9]+]])
    // CHECK-DAG: [[BORROW]] = begin_borrow [[COPYVAL:%[0-9]+]]
    // CHECK-DAG: [[COPYVAL]] = copy_value [[BORROW2:%[0-9]+]]
    // CHECK-DAG: [[BORROW2]] = begin_borrow [[STRINGCONST:%[0-9]+]]
    // CHECK-DAG: [[STRINGCONST]] = apply [[STRINGINIT:%[0-9]+]]([[LIT:%[0-9]+]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK-DAG: [[STRINGINIT]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK-DAG: [[LIT]] = string_literal oslog "test message: %lld"
    // CHECK-DAG: destroy_value [[STRINGCONST]] : $String
}

// CHECK-LABEL: @testPostdominatorComputation
sil [ossa] @testPostdominatorComputation : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "test message: %lld"
  %1 = integer_literal $Builtin.Word, 18
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %8 = begin_borrow %7 : $OSLogMessageStub
  %14 = struct_extract %8 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %15 = struct_extract %14 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  %9 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  cond_br %2, bb1, bb4

  // Use the OSLogMessage instance along different branches. The following code
  // deliberately uses a borrowed operation like struct_extract so that when it
  // is replaced with a folded value, it needs to be destroyed at the post-
  // dominating points of its uses.
bb1:
  %10 = struct_extract %8 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %11 = struct_extract %10 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  cond_br %2, bb2, bb3

bb2:
  %12 = apply %9(%11) : $@convention(thin) (@guaranteed String) -> ()
  br bb5

bb3:
  %13 = apply %9(%11) : $@convention(thin) (@guaranteed String) -> ()
  br bb5

bb4:
  %16 = apply %9(%15) : $@convention(thin) (@guaranteed String) -> ()
  br bb5

bb5:
  end_borrow %8 : $OSLogMessageStub
  destroy_value %7 : $OSLogMessageStub
  %17 = tuple ()
  return %17 : $()
    // We must have all string literals at the beginning of the borrowed scope,
    // and destroys of the literals at the end of the borrow scope.

    // CHECK: [[LIT:%[0-9]+]] = string_literal oslog "test message: %lld"
    // CHECK: [[STRINGINIT:%[0-9]+]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK: [[STRINGCONST:%[0-9]+]] = apply [[STRINGINIT]]([[LIT]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[STRINGCONST]]

    // CHECK: [[LIT2:%[0-9]+]] = string_literal oslog "test message: %lld"
    // CHECK: [[STRINGINIT2:%[0-9]+]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK: [[STRINGCONST2:%[0-9]+]] = apply [[STRINGINIT2]]([[LIT2]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK: [[BORROW2:%[0-9]+]] = begin_borrow [[STRINGCONST2]]

    // CHECK-LABEL: bb1:
    // CHECK-LABEL: bb5:
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[STRINGCONST]] : $String
    // CHECK: end_borrow [[BORROW2]]
    // CHECK: destroy_value [[STRINGCONST2]] : $String
}

// This test checks whether values that are transitively data dependent on
// an OSLogMessage instance are folded. These can be alive even beyond the
// lifetime of OSLogMessage.
// CHECK-LABEL: @testFoldingOfTransitiveDataDependencies
sil [ossa] @testFoldingOfTransitiveDataDependencies : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "test message: %lld"
  %1 = integer_literal $Builtin.Word, 18
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %8 = copy_value %7 : $OSLogMessageStub
  destroy_value %7 : $OSLogMessageStub
  %10 = begin_borrow %8 : $OSLogMessageStub
  %14 = struct_extract %10 : $OSLogMessageStub, #OSLogMessageStub.interpolation
  %15 = struct_extract %14 : $OSLogInterpolationStub, #OSLogInterpolationStub.formatString
  %12 = copy_value %15 : $String
  end_borrow %10 : $OSLogMessageStub
  destroy_value %8 : $OSLogMessageStub
  %9 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  %16 = apply %9(%12) : $@convention(thin) (@guaranteed String) -> ()
  destroy_value %12 : $String
  %17 = tuple ()
  return %17 : $()
    // CHECK-DAG: [[STRINGUSE:%[0-9]+]] = function_ref @useFormatString
    // CHECK-DAG: {{%.*}} = apply [[STRINGUSE]]([[CONSTCOPY:%[0-9]+]])
    // CHECK-DAG: [[CONSTCOPY]] = copy_value [[BORROW:%[0-9]+]]
    // CHECK-DAG: [[BORROW]] = begin_borrow [[STRINGCONST:%[0-9]+]]
    // CHECK-DAG: [[STRINGCONST]] = apply [[STRINGINIT:%[0-9]+]]([[LIT:%[0-9]+]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK-DAG: [[STRINGINIT]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK-DAG: [[LIT]] = string_literal oslog "test message: %lld"
    // CHECK-DAG: destroy_value [[STRINGCONST]] : $String
}

// Check folding of arrays by the OSLogOptimization pass.

/// A simplified stub for OSLogInterpolation type for testing array folding.
struct OSLogInterpolationArrayStub {
  var arguments: [Int64]
}

/// A simplified stub for OSLogMessage for testing array folding.
struct OSLogMessageArrayStub {
  var interpolation: OSLogInterpolationArrayStub
}

/// A stub for OSLogMessage.init. The optimization is driven by this function.
/// This function must take at least one argument which is required by the pass.
sil [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageArrayStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageArrayStub {
bb0(%0 : $Builtin.Int1):
  // Create an array with elements 99, 98 and 90
  %1 = integer_literal $Builtin.Word, 3
  // function_ref _allocateUninitializedArray<A>(_:)
  %2 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %3 = apply %2<Int64>(%1) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %4 = tuple_extract %3 : $(Array<Int64>, Builtin.RawPointer), 0
  %5 = tuple_extract %3 : $(Array<Int64>, Builtin.RawPointer), 1
  %6 = pointer_to_address %5 : $Builtin.RawPointer to [strict] $*Int64
  %7 = integer_literal $Builtin.Int64, 99
  %8 = struct $Int64 (%7 : $Builtin.Int64)
  store %8 to %6 : $*Int64
  %10 = integer_literal $Builtin.Word, 1
  %11 = index_addr %6 : $*Int64, %10 : $Builtin.Word
  %12 = integer_literal $Builtin.Int64, 98
  %13 = struct $Int64 (%12 : $Builtin.Int64)
  store %13 to %11 : $*Int64
  %15 = integer_literal $Builtin.Word, 2
  %16 = index_addr %6 : $*Int64, %15 : $Builtin.Word
  %17 = integer_literal $Builtin.Int64, 90
  %18 = struct $Int64 (%17 : $Builtin.Int64)
  store %18 to %16 : $*Int64

  // Create an instance of OSLogMessageArrayStub using the above array.
  %20 = struct $OSLogInterpolationArrayStub(%4 : $Array<Int64>)
  %21 = struct $OSLogMessageArrayStub(%20 : $OSLogInterpolationArrayStub)
  return %21 : $OSLogMessageArrayStub
}

// _allocateUninitializedArray<A>(_:)
sil [serialized] [always_inline] [_semantics "array.uninitialized_intrinsic"] @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)

/// A function that models the use of an array.
sil @useArray: $@convention(thin) (@guaranteed Array<Int64>) -> ()

// CHECK-LABEL: @testConstantFoldingOfArray
sil [ossa] @testConstantFoldingOfArray : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageArrayStub instance.
  %0 = integer_literal $Builtin.Int1, 1
  %1 = function_ref @oslogMessageArrayStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageArrayStub
  %2 = apply %1(%0) : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageArrayStub

  // Use the arguments property of OSLogMessageArrayStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %3 = begin_borrow %2 : $OSLogMessageArrayStub
  %4 = struct_extract %3 : $OSLogMessageArrayStub, #OSLogMessageArrayStub.interpolation
  %5 = struct_extract %4 : $OSLogInterpolationArrayStub, #OSLogInterpolationArrayStub.arguments
  %6 = function_ref @useArray : $@convention(thin) (@guaranteed Array<Int64>) -> ()
  %7 = apply %6(%5) : $@convention(thin) (@guaranteed Array<Int64>) -> ()
  end_borrow %3 : $OSLogMessageArrayStub
  destroy_value %2 : $OSLogMessageArrayStub
  %8 = tuple ()
  return %8 : $()
    // CHECK: [[ELEM1:%[0-9]+]] = integer_literal $Builtin.Int64, 99
    // CHECK: [[ELEM1INT:%[0-9]+]] = struct $Int64 ([[ELEM1]] : $Builtin.Int64)
    // CHECK: [[ELEM2:%[0-9]+]] = integer_literal $Builtin.Int64, 98
    // CHECK: [[ELEM2INT:%[0-9]+]] = struct $Int64 ([[ELEM2]] : $Builtin.Int64)
    // CHECK: [[ELEM3:%[0-9]+]] = integer_literal $Builtin.Int64, 90
    // CHECK: [[ELEM3INT:%[0-9]+]] = struct $Int64 ([[ELEM3]] : $Builtin.Int64)
    // CHECK: [[NUMELEMS:%[0-9]+]] = integer_literal $Builtin.Word, 3
    // CHECK: [[ALLOCATORREF:%[0-9]+]] = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF
    // CHECK: [[TUPLE:%[0-9]+]] = apply [[ALLOCATORREF]]<Int64>([[NUMELEMS]])
    // CHECK: ([[ARRAY:%[0-9]+]], [[STORAGEPTR:%[0-9]+]]) = destructure_tuple [[TUPLE]]
    // CHECK: [[MDI:%.*]] = mark_dependence [[STORAGEPTR]] : $Builtin.RawPointer on [[ARRAY]] : $Array<Int64>
    // CHECK: [[STORAGEADDR:%[0-9]+]] = pointer_to_address [[MDI]] : $Builtin.RawPointer to [strict] $*Int64
    // CHECK: store [[ELEM1INT]] to [trivial] [[STORAGEADDR]] : $*Int64
    // CHECK: [[INDEX1:%[0-9]+]] = integer_literal $Builtin.Word, 1
    // CHECK: [[INDEXADDR1:%[0-9]+]] = index_addr [[STORAGEADDR]] : $*Int64, [[INDEX1]] : $Builtin.Word
    // CHECK: store [[ELEM2INT]] to [trivial] [[INDEXADDR1]] : $*Int64
    // CHECK: [[INDEX2:%[0-9]+]] = integer_literal $Builtin.Word, 2
    // CHECK: [[INDEXADDR2:%[0-9]+]] = index_addr [[STORAGEADDR]] : $*Int64, [[INDEX2]] : $Builtin.Word
    // CHECK: store [[ELEM3INT]] to [trivial] [[INDEXADDR2]] : $*Int64
    // CHECK: [[FINALIZEREF:%[0-9]+]] = function_ref @$ss27_finalizeUninitializedArrayySayxGABnlF
    // CHECK: [[FINALIZED:%[0-9]+]] = apply [[FINALIZEREF]]<Int64>([[ARRAY]])
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[FINALIZED]]
    // CHECK: [[USEREF:%[0-9]+]] = function_ref @useArray
    // CHECK: apply [[USEREF]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[FINALIZED]] : $Array<Int64>
}

/// A stub for OSLogMessage.init. The optimization is driven by this function.
/// This function must take at least one argument which is required by the pass.
sil [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageStubEmptyArrayInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageArrayStub {
bb0(%0 : $Builtin.Int1):
  // Create an empty array
  %1 = integer_literal $Builtin.Word, 0
  // function_ref _allocateUninitializedArray<A>(_:)
  %2 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %3 = apply %2<Int64>(%1) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %4 = tuple_extract %3 : $(Array<Int64>, Builtin.RawPointer), 0

  // Create an instance of OSLogMessageArrayStub using the above array.
  %20 = struct $OSLogInterpolationArrayStub(%4 : $Array<Int64>)
  %21 = struct $OSLogMessageArrayStub(%20 : $OSLogInterpolationArrayStub)
  return %21 : $OSLogMessageArrayStub
}

// CHECK-LABEL: @testConstantFoldingOfEmptyArray
sil [ossa] @testConstantFoldingOfEmptyArray : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageArrayStub instance.
  %0 = integer_literal $Builtin.Int1, 1
  %1 = function_ref @oslogMessageStubEmptyArrayInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageArrayStub
  %2 = apply %1(%0) : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageArrayStub

  // Use the arguments property of OSLogMessageArrayStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %3 = begin_borrow %2 : $OSLogMessageArrayStub
  %4 = struct_extract %3 : $OSLogMessageArrayStub, #OSLogMessageArrayStub.interpolation
  %5 = struct_extract %4 : $OSLogInterpolationArrayStub, #OSLogInterpolationArrayStub.arguments
  %6 = function_ref @useArray : $@convention(thin) (@guaranteed Array<Int64>) -> ()
  %7 = apply %6(%5) : $@convention(thin) (@guaranteed Array<Int64>) -> ()
  end_borrow %3 : $OSLogMessageArrayStub
  destroy_value %2 : $OSLogMessageArrayStub
  %8 = tuple ()
  return %8 : $()
    // CHECK: [[NUMELEMS:%[0-9]+]] = integer_literal $Builtin.Word, 0
    // CHECK: [[ALLOCATORREF:%[0-9]+]] = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF
    // CHECK: [[TUPLE:%[0-9]+]] = apply [[ALLOCATORREF]]<Int64>([[NUMELEMS]])
    // CHECK: ([[ARRAY:%[0-9]+]], [[STORAGEPTR:%[0-9]+]]) = destructure_tuple [[TUPLE]]
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[ARRAY]]
    // CHECK: [[USEREF:%[0-9]+]] = function_ref @useArray
    // CHECK: apply [[USEREF]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[ARRAY]] : $Array<Int64>
}

/// A simplified stub for OSLogInterpolation type for testing folding of array
/// of strings.
struct OSLogInterpolationStringArrayStub {
  var arguments: [String]
}

/// A simplified stub for OSLogMessage for testing folding of array of strings.
struct OSLogMessageStringArrayStub {
  var interpolation: OSLogInterpolationStringArrayStub
}

/// A stub for OSLogMessage.init. The os_log optimization is driven by this
/// function. This function must take at least one argument which is required
/// by the pass.
sil [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageStringArrayStubInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStringArrayStub {
bb0(%0 : $String):
  // Create an array with one element "a"
  %1 = integer_literal $Builtin.Word, 1
  // function_ref _allocateUninitializedArray<A>(_:)
  %2 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %3 = apply %2<String>(%1) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %4 = tuple_extract %3 : $(Array<String>, Builtin.RawPointer), 0
  %5 = tuple_extract %3 : $(Array<String>, Builtin.RawPointer), 1
  %6 = pointer_to_address %5 : $Builtin.RawPointer to [strict] $*String
  store %0 to %6 : $*String

  // Create an instance of OSLogMessageArrayStub using the above array.
  %20 = struct $OSLogInterpolationStringArrayStub(%4 : $Array<String>)
  %21 = struct $OSLogMessageStringArrayStub(%20 : $OSLogInterpolationStringArrayStub)
  return %21 : $OSLogMessageStringArrayStub
}

/// A function that models the use of an array.
sil @useArrayString: $@convention(thin) (@guaranteed Array<String>) -> ()

// CHECK-LABEL: @testConstantFoldingOfStringArray
sil [ossa] @testConstantFoldingOfStringArray : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStringArrayStub instance.
  %10 = string_literal utf8 "ab"
  %11 = integer_literal $Builtin.Word, 2
  %12 = integer_literal $Builtin.Int1, -1
  %13 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %14 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %15 = apply %14(%10, %11, %12, %13) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type)   -> @owned String
  %1 = function_ref @oslogMessageStringArrayStubInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStringArrayStub
  %2 = apply %1(%15) : $@convention(thin) (@owned String) -> @owned OSLogMessageStringArrayStub

  // Use the arguments property of OSLogMessageStringArrayStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %3 = begin_borrow %2 : $OSLogMessageStringArrayStub
  %4 = struct_extract %3 : $OSLogMessageStringArrayStub, #OSLogMessageStringArrayStub.interpolation
  %5 = struct_extract %4 : $OSLogInterpolationStringArrayStub, #OSLogInterpolationStringArrayStub.arguments
  %6 = function_ref @useArrayString : $@convention(thin) (@guaranteed Array<String>) -> ()
  %7 = apply %6(%5) : $@convention(thin) (@guaranteed Array<String>) -> ()
  end_borrow %3 : $OSLogMessageStringArrayStub
  destroy_value %2 : $OSLogMessageStringArrayStub
  %8 = tuple ()
  return %8 : $()
    // The first instance of "ab" will be dead code eliminated.
    // CHECK: [[LIT:%[0-9]+]] = string_literal oslog "ab"
    // CHECK: [[STRINGINIT:%[0-9]+]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK: [[STRINGCONST:%[0-9]+]] = apply [[STRINGINIT]]([[LIT]], {{%.*}}, {{%.*}}, {{%.*}})
    // CHECK: [[NUMELEMS:%[0-9]+]] = integer_literal $Builtin.Word, 1
    // CHECK: [[ALLOCATORREF:%[0-9]+]] = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF
    // CHECK: [[TUPLE:%[0-9]+]] = apply [[ALLOCATORREF]]<String>([[NUMELEMS]])
    // CHECK: ([[ARRAY:%[0-9]+]], [[STORAGEPTR:%[0-9]+]]) = destructure_tuple [[TUPLE]]
    // CHECK: [[MDI:%.*]] = mark_dependence [[STORAGEPTR]] : $Builtin.RawPointer on [[ARRAY]] : $Array<String>
    // CHECK: [[STORAGEADDR:%[0-9]+]] = pointer_to_address [[MDI]] : $Builtin.RawPointer to [strict] $*String
    // CHECK: store [[STRINGCONST]] to [init] [[STORAGEADDR]] : $*String
    // CHECK: [[FINALIZEREF:%[0-9]+]] = function_ref @$ss27_finalizeUninitializedArrayySayxGABnlF
    // CHECK: [[FINALIZED:%[0-9]+]] = apply [[FINALIZEREF]]<String>([[ARRAY]])
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[FINALIZED]]
    // CHECK: [[USEREF:%[0-9]+]] = function_ref @useArrayString
    // CHECK: apply [[USEREF]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[FINALIZED]] : $Array<String>
}

sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageArrayInterpolationInit : $@convention(thin) (@owned OSLogInterpolationArrayStub)
  -> @owned OSLogMessageArrayStub {
bb0(%0 : @owned $OSLogInterpolationArrayStub):
  %1 = struct $OSLogMessageArrayStub(%0 : $OSLogInterpolationArrayStub)
  return %1 : $OSLogMessageArrayStub
}

// CHECK-LABEL: @testNoFoldingOfArrayLiterals
sil [ossa] @testNoFoldingOfArrayLiterals : $@convention(thin) () -> () {
bb0:
  // Create an empty array
  %1 = integer_literal $Builtin.Word, 0
  // function_ref _allocateUninitializedArray<A>(_:)
  %2 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %3 = apply %2<Int64>(%1) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  (%4, %ignore) = destructure_tuple %3 : $(Array<Int64>, Builtin.RawPointer)
  %5 = copy_value %4 : $Array<Int64>
  %6 = struct $OSLogInterpolationArrayStub(%4 : $Array<Int64>)
  %7 = function_ref @oslogMessageArrayInterpolationInit : $@convention(thin) (@owned OSLogInterpolationArrayStub) -> @owned OSLogMessageArrayStub
  %8 = apply %7(%6) : $@convention(thin) (@owned OSLogInterpolationArrayStub) -> @owned OSLogMessageArrayStub
  // Use the array literal.
  %9 = function_ref @useArray : $@convention(thin) (@guaranteed Array<Int64>) -> ()
  %10 = apply %9(%5) : $@convention(thin) (@guaranteed Array<Int64>) -> ()
  destroy_value %5 : $Array<Int64>
  destroy_value %8 : $OSLogMessageArrayStub
  %11 = tuple ()
  return %11 : $()
    // There should be only one instance of _allocateUninitializedArray
    // CHECK-LABEL: function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF
    // CHECK-NOT: function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF
}

// Check folding of closures by the OSLogOptimization pass.

/// A simplified stub for OSLogInterpolation type for testing closure folding.
struct OSLogInterpolationClosureStub {
  var closure: () -> Int32
}

/// A simplified stub for OSLogMessage for testing closure folding.
struct OSLogMessageClosureStub {
  var interpolation: OSLogInterpolationClosureStub
}

sil private @idFunction : $@convention(thin) (Int32) -> Int32 {
bb0(%0 : $Int32):
  return %0 : $Int32
}

/// A stub for OSLogMessage.init. The optimization is driven by this function.
/// This function must take at least one argument which is required by the pass.
sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageClosureStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureStub {
bb0(%0 : $Builtin.Int1):
  %7 = integer_literal $Builtin.Int32, 81
  %8 = struct $Int32 (%7 : $Builtin.Int32)
  %9 = function_ref @idFunction : $@convention(thin) (Int32) -> Int32
  %10 = partial_apply [callee_guaranteed] %9(%8) : $@convention(thin) (Int32) -> Int32

  // Create an instance of OSLogMessageClosureStub using the above closure.
  %20 = struct $OSLogInterpolationClosureStub(%10 : $@callee_guaranteed () -> Int32)
  %21 = struct $OSLogMessageClosureStub(%20 : $OSLogInterpolationClosureStub)
  return %21 : $OSLogMessageClosureStub
}

/// A function that models the use of a closure.
sil @useClosure: $@convention(thin) (@callee_guaranteed () -> Int32) -> ()

// CHECK-LABEL: @testConstantFoldingOfClosure
sil [ossa] @testConstantFoldingOfClosure : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageClosureStub instance.
  %0 = integer_literal $Builtin.Int1, 1
  %1 = function_ref @oslogMessageClosureStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureStub
  %2 = apply %1(%0) : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureStub

  // Use the closure property of OSLogMessageClosureStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %3 = begin_borrow %2 : $OSLogMessageClosureStub
  %4 = struct_extract %3 : $OSLogMessageClosureStub, #OSLogMessageClosureStub.interpolation
  %5 = struct_extract %4 : $OSLogInterpolationClosureStub, #OSLogInterpolationClosureStub.closure
  %6 = function_ref @useClosure : $@convention(thin) (@callee_guaranteed () -> Int32) -> ()
  %7 = apply %6(%5) : $@convention(thin) (@callee_guaranteed () -> Int32) -> ()
  end_borrow %3 : $OSLogMessageClosureStub
  destroy_value %2 : $OSLogMessageClosureStub
  %8 = tuple ()
  return %8 : $()
    // CHECK: [[LIT:%[0-9]+]] = integer_literal $Builtin.Int32, 81
    // CHECK: [[INT:%[0-9]+]] = struct $Int32 ([[LIT]] : $Builtin.Int32)
    // CHECK: [[FUNREF:%[0-9]+]] = function_ref @idFunction
    // CHECK: [[CLOSURE:%[0-9]+]] = partial_apply [callee_guaranteed] [[FUNREF]]([[INT]])
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[CLOSURE]] : $@callee_guaranteed () -> Int32
    // CHECK: [[USE:%[0-9]+]] = function_ref @useClosure
    // CHECK: apply [[USE]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[CLOSURE]]
}

sil private @constantFunction : $@convention(thin) () -> Int32 {
bb0:
  %0 = integer_literal $Builtin.Int32, 91
  %1 = struct $Int32 (%0 : $Builtin.Int32)
  return %1 : $Int32
}

sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageThinClosureStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureStub {
bb0(%0 : $Builtin.Int1):
  %7 = integer_literal $Builtin.Int32, 81
  %8 = struct $Int32 (%7 : $Builtin.Int32)
  %9 = function_ref @constantFunction : $@convention(thin) () -> Int32
  %10 = thin_to_thick_function %9 : $@convention(thin) () -> Int32 to $@callee_guaranteed () -> Int32
  // Create an instance of OSLogMessageClosureStub using the above closure.
  %20 = struct $OSLogInterpolationClosureStub(%10 : $@callee_guaranteed () -> Int32)
  %21 = struct $OSLogMessageClosureStub(%20 : $OSLogInterpolationClosureStub)
  return %21 : $OSLogMessageClosureStub
}

// CHECK-LABEL: @testConstantFoldingOfThinClosure
sil [ossa] @testConstantFoldingOfThinClosure : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageClosureStub instance.
  %0 = integer_literal $Builtin.Int1, 1
  %1 = function_ref @oslogMessageThinClosureStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureStub
  %2 = apply %1(%0) : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureStub

  %3 = begin_borrow %2 : $OSLogMessageClosureStub
  %4 = struct_extract %3 : $OSLogMessageClosureStub, #OSLogMessageClosureStub.interpolation
  %5 = struct_extract %4 : $OSLogInterpolationClosureStub, #OSLogInterpolationClosureStub.closure
  %6 = function_ref @useClosure : $@convention(thin) (@callee_guaranteed () -> Int32) -> ()
  %7 = apply %6(%5) : $@convention(thin) (@callee_guaranteed () -> Int32) -> ()
  end_borrow %3 : $OSLogMessageClosureStub
  destroy_value %2 : $OSLogMessageClosureStub
  %8 = tuple ()
  return %8 : $()
    // CHECK: [[FUNREF:%[0-9]+]] = function_ref @constantFunction
    // CHECK: [[CLOSURE:%[0-9]+]] = partial_apply [callee_guaranteed] [[FUNREF]]()
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[CLOSURE]] : $@callee_guaranteed () -> Int32
    // CHECK: [[USE:%[0-9]+]] = function_ref @useClosure
    // CHECK: apply [[USE]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[CLOSURE]]
}

/// A simplified stub for OSLogInterpolation type for testing folding of
/// closures with non-trivial captures.
struct OSLogInterpolationStringCapture {
  var closure: () -> String
}

/// A simplified stub for OSLogMessage for testing folding of closures with
/// non-trivial captures.
struct OSLogMessageStringCapture {
  var interpolation: OSLogInterpolationStringCapture
}

sil [ossa] @idString : $@convention(thin) (@guaranteed String) -> @owned String {
bb0(%0 : @guaranteed $String):
  %1 = copy_value %0 : $String
  return %1 : $String
}

sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageStringCaptureInit : $@convention(thin) (@owned OSLogInterpolationStringCapture)
  -> @owned OSLogMessageStringCapture {
bb0(%0 : @owned $OSLogInterpolationStringCapture):
  %5 = struct $OSLogMessageStringCapture(%0 : $OSLogInterpolationStringCapture)
  return %5 : $OSLogMessageStringCapture
}

sil @useStringCapture: $@convention(thin) (@callee_guaranteed () -> @owned String) -> ()

// CHECK-LABEL: @testConstantFoldingOfStringCapture
sil [ossa] @testConstantFoldingOfStringCapture : $@convention(thin) (@guaranteed String) -> () {
bb0(%0 : @guaranteed $String):
  %1 = function_ref @idString : $@convention(thin) (@guaranteed String) -> @owned String
  %2 = copy_value %0 : $String
  %3 = partial_apply [callee_guaranteed] %1(%2) : $@convention(thin) (@guaranteed String) -> @owned String
  %4 = struct $OSLogInterpolationStringCapture(%3 : $@callee_guaranteed () -> @owned String)
  %5 = function_ref @oslogMessageStringCaptureInit : $@convention(thin) (@owned OSLogInterpolationStringCapture) -> @owned OSLogMessageStringCapture
  %6 = apply %5(%4) : $@convention(thin) (@owned OSLogInterpolationStringCapture) -> @owned OSLogMessageStringCapture

  %13 = begin_borrow %6 : $OSLogMessageStringCapture
  %14 = struct_extract %13 : $OSLogMessageStringCapture, #OSLogMessageStringCapture.interpolation
  %15 = struct_extract %14 : $OSLogInterpolationStringCapture, #OSLogInterpolationStringCapture.closure
  %16 = function_ref @useStringCapture : $@convention(thin) (@callee_guaranteed () -> @owned String) -> ()
  %17 = apply %16(%15) : $@convention(thin) (@callee_guaranteed () -> @owned String) -> ()
  end_borrow %13 : $OSLogMessageStringCapture
  destroy_value %6 : $OSLogMessageStringCapture
  %18 = tuple ()
  return %18 : $()
    // CHECK: [[FUNREF:%[0-9]+]] = function_ref @idString
    // CHECK: [[ORIGCAPTURE:%[0-9]+]] = copy_value %0 : $String
    // CHECK: [[CLOSURE:%[0-9]+]] = partial_apply [callee_guaranteed] [[FUNREF]]([[ORIGCAPTURE]])
    // CHECK: [[CLOSURECOPY:%[0-9]+]] = copy_value [[CLOSURE]]
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[CLOSURECOPY]] : $@callee_guaranteed () -> @owned String
    // CHECK: [[USE:%[0-9]+]] = function_ref @useStringCapture
    // CHECK: apply [[USE]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[CLOSURECOPY]]
}

sil [ossa] @genericFunction : $@convention(thin) <U, V> (@in_guaranteed U, @in_guaranteed V) -> Int32 {
bb0(%0 : $*U, %1 : $*V):
  %2 = integer_literal $Builtin.Int32, 99
  %3 = struct $Int32 (%2 : $Builtin.Int32)
  return %3 : $Int32
}

sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageGenericClosureInit : $@convention(thin) (@owned OSLogInterpolationClosureStub) -> @owned OSLogMessageClosureStub {
bb0(%0 : @owned $OSLogInterpolationClosureStub):
  %5 = struct $OSLogMessageClosureStub(%0 : $OSLogInterpolationClosureStub)
  return %5 : $OSLogMessageClosureStub
}

// CHECK-LABEL: @testConstantFoldingOfGenericClosure
sil [ossa] @testConstantFoldingOfGenericClosure : $@convention(thin) () -> () {
bb0:
  %0 = integer_literal $Builtin.Int1, 1
  %1 = alloc_stack $Int64
  %2 = alloc_stack $Bool
  %3 = struct $Bool (%0 : $Builtin.Int1)
  store %3 to [trivial] %2 : $*Bool
  %4 = integer_literal $Builtin.Int64, 81
  %5 = struct $Int64 (%4 : $Builtin.Int64)
  store %5 to [trivial] %1 : $*Int64

  %6 = function_ref @genericFunction : $@convention(thin) <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0, @in_guaranteed τ_0_1) -> Int32
  %7 = partial_apply [callee_guaranteed] %6<Int64, Bool>(%1, %2) : $@convention(thin) <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0, @in_guaranteed τ_0_1) -> Int32
  %8 = struct $OSLogInterpolationClosureStub(%7 : $@callee_guaranteed () -> Int32)
  %11 = function_ref @oslogMessageGenericClosureInit : $@convention(thin) (@owned OSLogInterpolationClosureStub) -> @owned OSLogMessageClosureStub
  %12 = apply %11(%8) : $@convention(thin) (@owned OSLogInterpolationClosureStub) -> @owned OSLogMessageClosureStub

  %13 = begin_borrow %12 : $OSLogMessageClosureStub
  %14 = struct_extract %13 : $OSLogMessageClosureStub, #OSLogMessageClosureStub.interpolation
  %15 = struct_extract %14 : $OSLogInterpolationClosureStub, #OSLogInterpolationClosureStub.closure
  %16 = function_ref @useClosure : $@convention(thin) (@callee_guaranteed () -> Int32) -> ()
  %17 = apply %16(%15) : $@convention(thin) (@callee_guaranteed () -> Int32) -> ()
  end_borrow %13 : $OSLogMessageClosureStub
  destroy_value %12 : $OSLogMessageClosureStub
  dealloc_stack %2 : $*Bool
  dealloc_stack %1 : $*Int64
  %18 = tuple ()
  return %18 : $()
    // The first instance of function_ref @genericFunction will be dead-code eliminated.
    // CHECK: [[FUNREF:%[0-9]+]] = function_ref @genericFunction
    // CHECK: [[CLOSURE:%[0-9]+]] = partial_apply [callee_guaranteed] [[FUNREF]]<Int64, Bool>([[CAPTURE1:%[0-9]+]], [[CAPTURE2:%[0-9]+]])
    // CHECK: [[CLOSURECOPY:%[0-9]+]] = copy_value [[CLOSURE]]
    // CHECK: [[BORROW:%[0-9]+]] = begin_borrow [[CLOSURECOPY]] : $@callee_guaranteed () -> Int32
    // CHECK: [[USE:%[0-9]+]] = function_ref @useClosure
    // CHECK: apply [[USE]]([[BORROW]])
    // CHECK: end_borrow [[BORROW]]
    // CHECK: destroy_value [[CLOSURECOPY]]
}

// Check folding of array of closures. This is essentially the feature needed
// by the OSLog overlay.

/// A simplified stub for OSLogInterpolation type for testing folding of array
/// of closures.
struct OSLogInterpolationClosureArrayStub {
  var closure: [() -> Int32]
}

/// A simplified stub for OSLogMessage for testing folding of array of closures.
struct OSLogMessageClosureArrayStub {
  var interpolation: OSLogInterpolationClosureArrayStub
}

sil private @closure1 : $@convention(thin) (Int32) -> Int32 {
bb0(%0 : $Int32):
  return %0 : $Int32
}

sil shared [transparent] [reabstraction_thunk] @$ss5Int32VIegd_ABIegr_TR : $@convention(thin) (@guaranteed @callee_guaranteed () -> Int32) -> @out Int32 {
bb0(%0 : $*Int32, %1 : $@callee_guaranteed () -> Int32):
  %2 = apply %1() : $@callee_guaranteed () -> Int32
  store %2 to %0 : $*Int32
  %4 = tuple ()
  return %4 : $()
}

/// A stub for OSLogMessage.init. The optimization is driven by this function.
/// This function must take at least one argument which is required by the pass.
sil [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageClosureArrayStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureArrayStub {
bb0(%0 : $Builtin.Int1):
  %1 = integer_literal $Builtin.Word, 1
  // function_ref _allocateUninitializedArray<A>(_:)
  %2 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %3 = apply %2<() -> Int32>(%1) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %4 = tuple_extract %3 : $(Array<() -> Int32>, Builtin.RawPointer), 0
  %5 = tuple_extract %3 : $(Array<() -> Int32>, Builtin.RawPointer), 1
  %6 = pointer_to_address %5 : $Builtin.RawPointer to [strict] $*@callee_guaranteed @substituted <A> () -> @out A for <Int32>
  %7 = integer_literal $Builtin.Int32, 81
  %8 = struct $Int32 (%7 : $Builtin.Int32)
  %9 = function_ref @closure1 : $@convention(thin) (Int32) -> Int32
  %10 = partial_apply [callee_guaranteed] %9(%8) : $@convention(thin) (Int32) -> Int32
  %11 = function_ref @$ss5Int32VIegd_ABIegr_TR : $@convention(thin) (@guaranteed @callee_guaranteed () -> Int32) -> @out Int32 
  %12 = partial_apply [callee_guaranteed] %11(%10) : $@convention(thin) (@guaranteed @callee_guaranteed () -> Int32) -> @out Int32 
  %13 = convert_function %12 : $@callee_guaranteed () -> @out Int32 to $@callee_guaranteed @substituted <A> () -> @out A for <Int32>
  store %13 to %6 : $*@callee_guaranteed @substituted <A> () -> @out A for <Int32>

  // Create an instance of OSLogMessageClosureArrayStub using the above array
  // of closures.
  %20 = struct $OSLogInterpolationClosureArrayStub(%4 : $Array<() -> Int32>)
  %21 = struct $OSLogMessageClosureArrayStub(%20 : $OSLogInterpolationClosureArrayStub)
  return %21 : $OSLogMessageClosureArrayStub
}

/// A function that models the use of an array of closures.
sil @useClosureArray: $@convention(thin) (@guaranteed Array<() -> Int32>) -> ()

// CHECK-LABEL: @testConstantFoldingOfClosureArray
sil [ossa] @testConstantFoldingOfClosureArray : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageClosureArrayStub instance.
  %0 = integer_literal $Builtin.Int1, 1
  %1 = function_ref @oslogMessageClosureArrayStubInit : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureArrayStub
  %2 = apply %1(%0) : $@convention(thin) (Builtin.Int1) -> @owned OSLogMessageClosureArrayStub

  // Use the arguments property of OSLogMessageClosureArrayStub which will be constant
  // folded by the OSLogOptimization pass, as checked below.
  %3 = begin_borrow %2 : $OSLogMessageClosureArrayStub
  %4 = struct_extract %3 : $OSLogMessageClosureArrayStub, #OSLogMessageClosureArrayStub.interpolation
  %5 = struct_extract %4 : $OSLogInterpolationClosureArrayStub, #OSLogInterpolationClosureArrayStub.closure
  %6 = function_ref @useClosureArray : $@convention(thin) (@guaranteed Array<() -> Int32>) -> ()
  %7 = apply %6(%5) : $@convention(thin) (@guaranteed Array<() -> Int32>) -> ()
  end_borrow %3 : $OSLogMessageClosureArrayStub
  destroy_value %2 : $OSLogMessageClosureArrayStub
  %8 = tuple ()
  return %8 : $()
}

// The following tests are for checking dead-code elimination performed by the
// OSLogOptimization pass.

struct OSLogInterpolationDCEStub {
  var formatString: String
}

struct OSLogMessageDCEStub {
  var interpolation: OSLogInterpolationDCEStub
}

sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageDCEInit : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub {
bb0(%0 : @owned $OSLogInterpolationDCEStub):
  %1 = struct $OSLogMessageDCEStub (%0 : $OSLogInterpolationDCEStub)
  return %1 : $OSLogMessageDCEStub
}

// CHECK-LABEL: @testDCEOfStructCreation
sil [ossa] @testDCEOfStructCreation : $@convention(thin) () -> () {
bb0:
  %0 = string_literal utf8 "some message"
  %1 = integer_literal $Builtin.Word, 12
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = struct $OSLogInterpolationDCEStub(%5 : $String)
  %7 = copy_value %6 : $OSLogInterpolationDCEStub
  %8 = function_ref @oslogMessageDCEInit : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  %9 = apply %8(%7) : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  %10 = begin_borrow %9 : $OSLogMessageDCEStub
  end_borrow %10 : $OSLogMessageDCEStub
  destroy_value %9 : $OSLogMessageDCEStub
  destroy_value %6 : $OSLogInterpolationDCEStub
  %13 = tuple ()
  return %13 : $()
    // CHECK: bb0
    // CHECK-NEXT: [[EMPTYTUP:%[0-9]+]] = tuple ()
    // CHECK-NEXT: return [[EMPTYTUP]]
}

sil [ossa] [Onone] [_semantics "constant_evaluable"] [_semantics "oslog.message.init_stub"] @oslogMessageGuaranteedInit : $@convention(thin) (@guaranteed OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub {
bb0(%0 : @guaranteed $OSLogInterpolationDCEStub):
  %2 = copy_value %0 : $OSLogInterpolationDCEStub
  %3 = struct $OSLogMessageDCEStub (%2 : $OSLogInterpolationDCEStub)
  return %3 : $OSLogMessageDCEStub
}

// CHECK-LABEL: @testDCEOfGuaranteedStructCreation
sil [ossa] @testDCEOfGuaranteedStructCreation : $@convention(thin) () -> () {
bb0:
  %0 = string_literal utf8 "some message"
  %1 = integer_literal $Builtin.Word, 12
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = struct $OSLogInterpolationDCEStub(%5 : $String)
  %7 = begin_borrow %6 : $OSLogInterpolationDCEStub
  %9 = function_ref @oslogMessageGuaranteedInit : $@convention(thin) (@guaranteed OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  %10 = apply %9(%7) : $@convention(thin) (@guaranteed OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  destroy_value %10 : $OSLogMessageDCEStub
  end_borrow %7 : $OSLogInterpolationDCEStub
  destroy_value %6 : $OSLogInterpolationDCEStub
  %13 = tuple ()
  return %13 : $()
    // CHECK: bb0
    // CHECK-NEXT: [[EMPTYTUP:%[0-9]+]] = tuple ()
    // CHECK-NEXT: return [[EMPTYTUP]]
}

// CHECK-LABEL: @testLifetimeAdjustmentOfDCE
sil [ossa] @testLifetimeAdjustmentOfDCE : $@convention(thin) () -> () {
bb0:
  %0 = string_literal utf8 "some message"
  %1 = integer_literal $Builtin.Word, 12
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = copy_value %5 : $String
  %7 = struct $OSLogInterpolationDCEStub(%5 : $String)
  %8 = function_ref @oslogMessageDCEInit : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  %9 = apply %8(%7) : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  destroy_value %9 : $OSLogMessageDCEStub
  %11 = function_ref @useFormatString : $@convention(thin) (@guaranteed String) -> ()
  %12 = apply %11(%6) : $@convention(thin) (@guaranteed String) -> ()
  destroy_value %6 : $String
  %13 = tuple ()
  return %13 : $()
    // CHECK: [[STRINGINITREF:%[0-9]+]] = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC
    // CHECK: [[STRING:%[0-9]+]] = apply [[STRINGINITREF]](
    // CHECK-NEXT: [[COPY:%[0-9]+]]  = copy_value [[STRING]]
    // CHECK-NEXT: destroy_value [[STRING]]
    // CHECK-NOT: OSLogInterpolationDCEStub
    // CHECK-NOT: OSLogMessageDCEStub
    // CHECK: return
}

// Check dead-code elimination of alloc stack used only as inout parameter of a
// constant evaluable call (that only writes into that inout parameter).
sil [ossa] [_semantics "constant_evaluable"] @appendInterpolationStub : $@convention(thin) (@inout OSLogInterpolationDCEStub) -> () {
bb0(%0 : $*OSLogInterpolationDCEStub):
  %9999 = tuple()
  return %9999 : $()
}

// CHECK-LABEL: @testDCEOfAllocStack :
// CHECK: bb0
// CHECK-NEXT: [[EMPTYTUP:%[0-9]+]] = tuple ()
// CHECK-NEXT: return [[EMPTYTUP]]
sil [ossa] @testDCEOfAllocStack : $@convention(thin) () -> () {
bb0:
  %0 = string_literal utf8 "some message"
  %1 = integer_literal $Builtin.Word, 12
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = struct $OSLogInterpolationDCEStub(%5 : $String)
  %7 = alloc_stack $OSLogInterpolationDCEStub
  store %6 to [init] %7 : $*OSLogInterpolationDCEStub
  %8 = function_ref @appendInterpolationStub : $@convention(thin) (@inout OSLogInterpolationDCEStub) -> ()
  %9 = apply %8(%7) : $@convention(thin) (@inout OSLogInterpolationDCEStub) -> ()
  %10 = load [copy] %7 : $*OSLogInterpolationDCEStub
  %11 = function_ref @oslogMessageDCEInit : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  %12 = apply %11(%10) : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  destroy_value %12 : $OSLogMessageDCEStub
  destroy_addr %7 : $*OSLogInterpolationDCEStub
  dealloc_stack %7 : $*OSLogInterpolationDCEStub
  %13 = tuple ()
  return %13 : $()
}

// Check that dead-code elimination of alloc stack does not happen when there
// are multiple writable parameters
sil [ossa] [_semantics "constant_evaluable"] @appendInterpolationStubError : $@convention(thin) (@inout OSLogInterpolationDCEStub, @inout Builtin.Int32) -> () {
bb0(%0 : $*OSLogInterpolationDCEStub, %1 : $*Builtin.Int32):
  %9999 = tuple()
  return %9999 : $()
}

// CHECK-LABEL: @testNoDCEOfAllocStack
sil [ossa] @testNoDCEOfAllocStack : $@convention(thin) () -> () {
bb0:
  %0 = string_literal utf8 "some message"
  %1 = integer_literal $Builtin.Word, 12
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = struct $OSLogInterpolationDCEStub(%5 : $String)
  %7 = alloc_stack $OSLogInterpolationDCEStub
  store %6 to [init] %7 : $*OSLogInterpolationDCEStub
  %8 = alloc_stack $Builtin.Int32
  %lit = integer_literal $Builtin.Int32, -1
  store %lit to [trivial] %8 : $*Builtin.Int32
  %9 = function_ref @appendInterpolationStubError : $@convention(thin) (@inout OSLogInterpolationDCEStub, @inout Builtin.Int32) -> ()
  %10 = apply %9(%7, %8) : $@convention(thin) (@inout OSLogInterpolationDCEStub, @inout Builtin.Int32) -> ()
  %11 = load [copy] %7 : $*OSLogInterpolationDCEStub
  %12 = function_ref @oslogMessageDCEInit : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  %13 = apply %12(%11) : $@convention(thin) (@owned OSLogInterpolationDCEStub) -> @owned OSLogMessageDCEStub
  destroy_value %13 : $OSLogMessageDCEStub
  destroy_addr %7 : $*OSLogInterpolationDCEStub
  dealloc_stack %8 : $*Builtin.Int32
  dealloc_stack %7 : $*OSLogInterpolationDCEStub
  %14 = tuple ()
  return %14 : $()
    // CHECK: bb0
    // CHECK: alloc_stack $OSLogInterpolationDCEStub
}

// The following tests are for checking that constant folding doesn't
// cause a crash when evaluating the instructions of an animation signpost.

// Protocol stub for CVarArgStub
protocol CVarArgStub {}

// Ensure that Int conforms to our protocol stub
extension Int64 : CVarArgStub {}

// _finalizeUninitializedArray<A>(_:)
sil shared [serialized] [_semantics "array.finalize_intrinsic"] @$ss27_finalizeUninitializedArrayySayxGABnlF : $@convention(thin) <Element> (@owned Array<Element>) -> @owned Array<Element> {
bb0(%0 : $Array<Element>):
  return %0 : $Array<Element>
}

// Test that the OSLogOptimization does not fail while attempting to
// fold CVarArgStubs in animation signposts.
// CHECK-LABEL: @testFoldingOfCVarArgStubConstruction
sil [ossa] @testFoldingOfCVarArgStubConstruction : $@convention(thin) () -> () {
bb0:
  // Construct an OSLogMessageStub instance.
  %0 = string_literal utf8 "animation begins here %d"
  %1 = integer_literal $Builtin.Word, 24
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  // function_ref String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %4 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %5 = apply %4(%0, %1, %2, %3) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String // users: %60, %47
  %6 = function_ref @oslogMessageInit : $@convention(thin) (@owned String) -> @owned OSLogMessageStub
  %7 = apply %6(%5) : $@convention(thin) (@owned String) -> @owned OSLogMessageStub

  // Begin chain of evaluated instructions
  %8 = begin_borrow %7 : $OSLogMessageStub

  // Construct CVarArgStub
  %11 = integer_literal $Builtin.Word, 1
  // function_ref _allocateUninitializedArray<A>(_:)
  %12 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %13 = apply %12<CVarArgStub>(%11) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  (%14, %15) = destructure_tuple %13 : $(Array<CVarArgStub>, Builtin.RawPointer)
  %16 = pointer_to_address %15 : $Builtin.RawPointer to [strict] $*CVarArgStub
  %17 = integer_literal $Builtin.IntLiteral, 42
  %18 = builtin "s_to_s_checked_trunc_IntLiteral_Int64"(%17 : $Builtin.IntLiteral) : $(Builtin.Int64, Builtin.Int1)
  (%19, %20) = destructure_tuple %18 : $(Builtin.Int64, Builtin.Int1)
  %21 = struct $Int64 (%19 : $Builtin.Int64)
  %22 = init_existential_addr %16 : $*CVarArgStub, $Int64
  store %21 to [trivial] %22 : $*Int64
  // function_ref _finalizeUninitializedArray<A>(_:)
  %23 = function_ref @$ss27_finalizeUninitializedArrayySayxGABnlF : $@convention(thin) <τ_0_0> (@owned Array<τ_0_0>) -> @owned Array<τ_0_0>
  %24 = apply %23<CVarArgStub>(%14) : $@convention(thin) <τ_0_0> (@owned Array<τ_0_0>) -> @owned Array<τ_0_0>
  destroy_value %24 : $Array<CVarArgStub>

  // End chain of evaluated instructions
  end_borrow %8 : $OSLogMessageStub
  destroy_value %7 : $OSLogMessageStub
  %25 = tuple ()
  return %25 : $()
}