test/SILOptimizer/constant_evaluator_test.sil

// RUN: %target-sil-opt -test-constant-evaluator %s 2>&1 | %FileCheck %s

/// Tests for the constant evaluator in stepwise evaluation mode (also referred
/// to as flow-sensitive mode) in which instructions are evaluated following
/// the control flow of the program. The evaluator will be run on every function
/// whose name starts with `interpret` prefix and outputs the constant value
/// returned by the function or diagnostics if the evaluation fails.

sil_stage canonical

import Builtin
import Swift

// Test builtin literals and operations.

// CHECK-LABEL: @interpretBuiltinIntLiteral
sil @interpretBuiltinIntLiteral : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 17
  return %0 : $(Builtin.Int64)
} // CHECK: Returns int: 17

// CHECK-LABEL: @interpretBuiltinAddition
sil @interpretBuiltinAddition : $@convention(thin) () -> Builtin.Int32 {
bb0:
  %0 = integer_literal $Builtin.Int32, 1
  %1 = builtin "add_Int32"(%0 : $Builtin.Int32, %0 : $Builtin.Int32) : $(Builtin.Int32)
  return %1 : $(Builtin.Int32)
} // CHECK: Returns int: 2

// CHECK-LABEL: @interpretBuiltinAddWrapAround
sil @interpretBuiltinAddWrapAround : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int8, 127
  %1 = integer_literal $Builtin.Int8, 1
  %2 = builtin "add_Int32"(%0 : $Builtin.Int8, %1 : $Builtin.Int8) : $(Builtin.Int8)
  return %2 : $(Builtin.Int8)
} // CHECK: Returns int: -128

// CHECK-LABEL: @interpretBuiltinMultiplication
sil @interpretBuiltinMultiplication : $@convention(thin) () -> Builtin.Int64 {
bb0:
%0 = integer_literal $Builtin.Int64, 10
%1 = integer_literal $Builtin.Int64, 11
%2 = builtin "mul_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64) : $(Builtin.Int64)
return %2 : $(Builtin.Int64)
} // CHECK: Returns int: 110

// CHECK-LABEL: @interpretBuiltinDivision
sil @interpretBuiltinDivision : $@convention(thin) () -> Builtin.Int16 {
bb0:
  %0 = integer_literal $Builtin.Int16, 10
  %1 = integer_literal $Builtin.Int16, 11
  %2 = builtin "sdiv_Int16"(%1 : $Builtin.Int16, %0 : $Builtin.Int16) : $(Builtin.Int16)
  return %2 : $(Builtin.Int16)
} // CHECK: Returns int: 1

// CHECK-LABEL: @interpretBuiltinModulo
sil @interpretBuiltinModulo : $@convention(thin) () -> Builtin.Int16 {
bb0:
  %0 = integer_literal $Builtin.Int16, 23
  %1 = integer_literal $Builtin.Int16, 6
  %2 = builtin "srem_Int16"(%0 : $Builtin.Int16, %1 : $Builtin.Int16) : $(Builtin.Int16)
  return %2 : $(Builtin.Int16)
} // CHECK: Returns int: 5

// CHECK-LABEL: @interpretBuiltinLeftShift
sil @interpretBuiltinLeftShift : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int8, 10
  %1 = integer_literal $Builtin.Int8, 2
  %2 = builtin "shl_Int8"(%0 : $Builtin.Int8, %1: $Builtin.Int8) : $(Builtin.Int8)
  return %2 : $(Builtin.Int8)
} // CHECK: Returns int: 40

// CHECK-LABEL: @interpretBuiltinRightShift
sil @interpretBuiltinRightShift : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int8, 10
  %1 = integer_literal $Builtin.Int8, 2
  %2 = builtin "ashr_Int8"(%0 : $Builtin.Int8, %1: $Builtin.Int8) : $(Builtin.Int8)
  return %2 : $(Builtin.Int8)
} // CHECK: Returns int: 2

// CHECK-LABEL: @interpretBuiltinBitWiseAnd
sil @interpretBuiltinBitWiseAnd : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int8, 10
  %1 = integer_literal $Builtin.Int8, 8
  %2 = builtin "and_Int8"(%0 : $Builtin.Int8, %1: $Builtin.Int8) : $(Builtin.Int8)
  return %2 : $(Builtin.Int8)
} // CHECK: Returns int: 8

// CHECK-LABEL: @interpretBuiltinBitWiseOr
sil @interpretBuiltinBitWiseOr : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int8, 10
  %1 = integer_literal $Builtin.Int8, 8
  %2 = builtin "or_Int8"(%0 : $Builtin.Int8, %1: $Builtin.Int8) : $(Builtin.Int8)
  return %2 : $(Builtin.Int8)
} // CHECK: Returns int: 10

// Test conditional branches and comparison operators.

// CHECK-LABEL: @interpretFalseBranch
sil hidden @interpretFalseBranch : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = integer_literal $Builtin.Int64, 100
  %2 = integer_literal $Builtin.Int64, 0
  %3 = builtin "cmp_slt_Int64"(%1 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int1
  cond_br %3, bb1, bb2

bb1:
  %8 = integer_literal $Builtin.Int64, 0
  br bb3(%8 : $Builtin.Int64)

bb2:
  br bb3(%1 : $Builtin.Int64)

bb3(%12 : $Builtin.Int64):
  return %12 : $Builtin.Int64
} // CHECK: Returns int: 100

// CHECK-LABEL: @interpretTrueBranch
sil hidden @interpretTrueBranch : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = integer_literal $Builtin.Int64, 100
  %2 = integer_literal $Builtin.Int64, 0
  %3 = builtin "cmp_slt_Int64"(%1 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int1
  %4 = integer_literal $Builtin.Int1, -1
  %5 = builtin "xor_Int1"(%3 : $Builtin.Int1, %4 : $Builtin.Int1) : $Builtin.Int1
  cond_br %5, bb1, bb2

bb1:
  %8 = integer_literal $Builtin.Int64, 0
  br bb3(%8 : $Builtin.Int64)

bb2:
  br bb3(%1 : $Builtin.Int64)

bb3(%12 : $Builtin.Int64):
  return %12 : $Builtin.Int64
} // CHECK: Returns int: 0

// Test builtin truncation and extension.

// CHECK-LABEL: @interpretSignedTruncation
sil @interpretSignedTruncation : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int64, -1
  %1 = builtin "s_to_s_checked_trunc_Int64_Int8"(%0 : $Builtin.Int64) : $(Builtin.Int8, Builtin.Int1)
  %2 = tuple_extract %1 : $(Builtin.Int8, Builtin.Int1), 0
  return %2 : $(Builtin.Int8)
} // CHECK: Returns int: -1

// CHECK-LABEL: @interpretSignedTruncWithIntLiteral
sil @interpretSignedTruncWithIntLiteral : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.IntLiteral, 5
  %1 = builtin "s_to_s_checked_trunc_IntLiteral_Int64"(%0 : $Builtin.IntLiteral) : $(Builtin.Int64, Builtin.Int1)
  %2 = tuple_extract %1 : $(Builtin.Int64, Builtin.Int1), 0
  return %2 : $(Builtin.Int64)
} // CHECK: Returns int: 5

// CHECK-LABEL: @interpretSignedExtend
sil @interpretSignedExtend : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int8, -1
  %1 = builtin "sext_Int8_Int64"(%0 : $Builtin.Int8) : $Builtin.Int64
  return %1 : $(Builtin.Int64)
} // CHECK: Returns int: -1

// CHECK-LABEL: @interpretZeroExtend
sil @interpretZeroExtend : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int8, -1
  %1 = builtin "zext_Int8_Int64"(%0 : $Builtin.Int8) : $Builtin.Int64
  return %1 : $(Builtin.Int64)
} // CHECK: Returns int: 255

// FIXME: assertion failure in conversion of s_to_s_checked_trunc_IntLiteral.
sil @xfailInterpretBuiltinIntLiteralTrunc : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.IntLiteral, 2
  %2 = builtin "s_to_s_checked_trunc_IntLiteral_Int8"(%0 : $Builtin.IntLiteral) : $(Builtin.Int8, Builtin.Int1)
  %3 = tuple_extract %2 : $(Builtin.Int8, Builtin.Int1), 0
  return %3 : $(Builtin.Int8)
}

// Test overflow diagnostics.
// FIXME: Imprecision:  the following builtin operations return a tuple where
// the second element indicate whether an overflow happened or not.
// The interpreter currently makes the entire tuple unknown in the case of
// overflow. This should be replaced by the correct semantics of the builtin
// which produces a trucated value for the first element and returns true for
// the second element.

// CHECK-LABEL: @interpretSignedTruncationError
sil @interpretSignedTruncationError : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int64, -1
  %1 = builtin "s_to_u_checked_trunc_Int64_Int8"(%0 : $Builtin.Int64) : $(Builtin.Int8, Builtin.Int1)
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: integer overflow detected
  %2 = tuple_extract %1 : $(Builtin.Int8, Builtin.Int1), 0
  return %2 : $(Builtin.Int8)
}

// CHECK-LABEL: @interpretBuiltinAddOverflow
sil @interpretBuiltinAddOverflow : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int8, 127
  %1 = integer_literal $Builtin.Int8, 1
  %2 = integer_literal $Builtin.Int1, -1
  %3 = builtin "sadd_with_overflow_Int8"(%0 : $Builtin.Int8, %1 : $Builtin.Int8, %2: $Builtin.Int1) : $(Builtin.Int8, Builtin.Int1)
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: integer overflow detected
  %4 = tuple_extract %3 : $(Builtin.Int8, Builtin.Int1), 0
  return %4 : $(Builtin.Int8)
}

// Test function calls

sil hidden @identity : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
bb0(%0 : $Builtin.Int64):
  return %0 : $Builtin.Int64
}

// CHECK-LABEL: @interpretCallTest
sil hidden @interpretCallTest : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 10
  %2 = function_ref @identity : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  %3 = apply %2(%0) : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  return %3 : $Builtin.Int64
} // CHECK: Returns int: 10

// A function that computes factorial of a Builtin.Int64 and traps on overflow.
sil hidden @factorial : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
bb0(%0 : $Builtin.Int64):
  %2 = integer_literal $Builtin.Int64, 0
  %4 = builtin "cmp_eq_Int64"(%0 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int1
  cond_br %4, bb1, bb2

bb1:
  %8 = integer_literal $Builtin.Int64, 1
  br bb3(%8 : $Builtin.Int64)

bb2:
  %11 = integer_literal $Builtin.Int64, 1
  %13 = integer_literal $Builtin.Int1, -1
  %14 = builtin "usub_with_overflow_Int64"(%0 : $Builtin.Int64, %11 : $Builtin.Int64, %13 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
  %15 = tuple_extract %14 : $(Builtin.Int64, Builtin.Int1), 0
  %16 = tuple_extract %14 : $(Builtin.Int64, Builtin.Int1), 1
  cond_fail %16 : $Builtin.Int1
  %19 = function_ref @factorial : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  %20 = apply %19(%15) : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  %23 = integer_literal $Builtin.Int1, -1
  %24 = builtin "umul_with_overflow_Int64"(%0 : $Builtin.Int64, %20 : $Builtin.Int64, %23 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
  %25 = tuple_extract %24 : $(Builtin.Int64, Builtin.Int1), 0
  %26 = tuple_extract %24 : $(Builtin.Int64, Builtin.Int1), 1
  cond_fail %26 : $Builtin.Int1
  br bb3(%25 : $Builtin.Int64)

bb3(%30 : $Builtin.Int64):
  return %30 : $Builtin.Int64
}

// CHECK-LABEL: @interpretFactorialCall
sil hidden @interpretFactorialCall : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 5
  %2 = function_ref @factorial : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  %3 = apply %2(%0) : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  return %3 : $Builtin.Int64
} // CHECK: Returns int: 120

// CHECK-LABEL: @interpretAndDiagnoseLongRecursion
sil hidden @interpretAndDiagnoseLongRecursion : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, -5
  %2 = function_ref @factorial : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
  %3 = apply %2(%0) : $@convention(thin) (Builtin.Int64) -> Builtin.Int64
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: exceeded instruction limit: {{.*}} when evaluating the expression at compile time
    // CHECK: {{.*}}: note: limit exceeded here
  return %3 : $Builtin.Int64
}

// Test meta types.

// CHECK-LABEL: @interpretIntMetatype
sil @interpretIntMetatype : $@convention(thin) () -> @thin Int.Type {
bb0:
  %0 = metatype $@thin Int.Type
  return %0 : $@thin Int.Type
} // CHECK: Returns metatype: Int

// CHECK-LABEL: @interpretStringMetatype
sil @interpretStringMetatype : $@convention(thin) () -> @thin String.Type {
bb0:
  %0 = metatype $@thin String.Type
  return %0 : $@thin String.Type
} // CHECK: Returns metatype: String

// Test standard integers.

// CHECK-LABEL: @interpretIntInit
sil @interpretIntInit : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 122
  %1 = struct $Int64 (%0 : $Builtin.Int64)
  %2 = struct_extract %1 : $Int64, #Int64._value
  return %2 : $Builtin.Int64
} // CHECK: Returns int: 122

sil @mockInt8Init : $@convention(thin) (Builtin.Int64, @thin Int8.Type) -> Int8 {
bb0(%0 : $Builtin.Int64, %1 : $@thin Int8.Type):
  %2 = builtin "s_to_s_checked_trunc_Int64_Int8"(%0 : $Builtin.Int64) : $(Builtin.Int8, Builtin.Int1)
  %3 = tuple_extract %2 : $(Builtin.Int8, Builtin.Int1), 0
  %4 = struct $Int8 (%3 : $Builtin.Int8)
  return %4 : $Int8
}

// CHECK-LABEL: @interpretInt8Init
sil @interpretInt8Init : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %0 = integer_literal $Builtin.Int64, 122
  %1 = metatype $@thin Int8.Type
  %2 = function_ref @mockInt8Init : $@convention(thin) (Builtin.Int64, @thin Int8.Type) -> Int8
  %3 = apply %2(%0, %1) : $@convention(thin) (Builtin.Int64, @thin Int8.Type) -> Int8
  %4 = struct_extract %3 : $Int8, #Int8._value
  return %4 : $Builtin.Int8
} // CHECK: Returns int: 122

sil @boolEquals : $@convention(method) (Bool, Bool, @thin Bool.Type) -> Bool {
bb0(%0 : $Bool, %1 : $Bool, %2 : $@thin Bool.Type):
  %3 = struct_extract %0 : $Bool, #Bool._value
  %4 = struct_extract %1 : $Bool, #Bool._value
  %5 = builtin "cmp_eq_Int1"(%3 : $Builtin.Int1, %4 : $Builtin.Int1) : $Builtin.Int1
  %6 = struct $Bool (%5 : $Builtin.Int1)
  return %6 : $Bool
}

// CHECK-LABEL: @interpretBoolEquals
sil @interpretBoolEquals : $@convention(thin) () -> Builtin.Int1 {
bb0:
  %0 = integer_literal $Builtin.Int1, 0
  %1 = struct $Bool (%0 : $Builtin.Int1)
  %2 = integer_literal $Builtin.Int1, -1
  %3 = struct $Bool (%2 : $Builtin.Int1)
  %4 = metatype $@thin Bool.Type
  %5 = function_ref @boolEquals : $@convention(method) (Bool, Bool, @thin Bool.Type) -> Bool
  %6 = apply %5(%1, %3, %4) : $@convention(method) (Bool, Bool, @thin Bool.Type) -> Bool
  %7 = struct_extract %6 : $Bool, #Bool._value
  return %7 : $Builtin.Int1
} // CHECK: Returns int: 0

// Test custom structs.

struct InnerStruct {
  var z: Int64
  var w: Bool
}

struct CustomStruct {
  let x: (Int64, Int64)
  let y: InnerStruct
}

sil @innerStructInit : $@convention(method) (Int64, Bool, @thin InnerStruct.Type) -> InnerStruct {
bb0(%0 : $Int64, %1 : $Bool, %2 : $@thin InnerStruct.Type):
  %3 = struct $InnerStruct (%0 : $Int64, %1 : $Bool)
  return %3 : $InnerStruct
}

sil @customStructInit : $@convention(method) (Int64, Int64, InnerStruct, @thin CustomStruct.Type) -> CustomStruct {
bb0(%0 : $Int64, %1 : $Int64, %2 : $InnerStruct, %3 : $@thin CustomStruct.Type):
  %4 = tuple (%0 : $Int64, %1 : $Int64)
  %5 = struct $CustomStruct (%4 : $(Int64, Int64), %2 : $InnerStruct)
  return %5 : $CustomStruct
}

sil @constructCustomStruct : $@convention(thin) () -> CustomStruct {
bb0:
  %0 = metatype $@thin CustomStruct.Type
  %1 = integer_literal $Builtin.Int64, 1
  %2 = struct $Int64 (%1 : $Builtin.Int64)
  %3 = integer_literal $Builtin.Int64, 2
  %4 = struct $Int64 (%3 : $Builtin.Int64)
  %5 = metatype $@thin InnerStruct.Type
  %6 = integer_literal $Builtin.Int64, 3
  %7 = struct $Int64 (%6 : $Builtin.Int64)
  %8 = integer_literal $Builtin.Int1, -1
  %9 = struct $Bool (%8 : $Builtin.Int1)

  %10 = function_ref @innerStructInit : $@convention(method) (Int64, Bool, @thin InnerStruct.Type) -> InnerStruct
  %11 = apply %10(%7, %9, %5) : $@convention(method) (Int64, Bool, @thin InnerStruct.Type) -> InnerStruct

  %12 = function_ref @customStructInit : $@convention(method) (Int64, Int64, InnerStruct, @thin CustomStruct.Type) -> CustomStruct
  %13 = apply %12(%2, %4, %11, %0) : $@convention(method) (Int64, Int64, InnerStruct, @thin CustomStruct.Type) -> CustomStruct
  return %13 : $CustomStruct
}

// CHECK-LABEL: @interpretCustomStruct
sil @interpretCustomStruct : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = function_ref @constructCustomStruct : $@convention(thin) () -> CustomStruct
  %2 = apply %1() : $@convention(thin) () -> CustomStruct
  %3 = struct_extract %2 : $CustomStruct, #CustomStruct.x
  %4 = tuple_extract %3 : $(Int64, Int64), 0
  %5 = struct_extract %4 : $Int64, #Int64._value
  return %5 : $Builtin.Int64
} // CHECK: Returns int: 1

// CHECK-LABEL: @interpretCustomStruct2
sil @interpretCustomStruct2 : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = function_ref @constructCustomStruct : $@convention(thin) () -> CustomStruct
  %2 = apply %1() : $@convention(thin) () -> CustomStruct
  %3 = struct_extract %2 : $CustomStruct, #CustomStruct.x
  %4 = tuple_extract %3 : $(Int64, Int64), 1
  %5 = struct_extract %4 : $Int64, #Int64._value
  return %5 : $Builtin.Int64
} // CHECK: Returns int: 2

// CHECK-LABEL: @interpretCustomStruct3
sil @interpretCustomStruct3 : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = function_ref @constructCustomStruct : $@convention(thin) () -> CustomStruct
  %2 = apply %1() : $@convention(thin) () -> CustomStruct
  %3 = struct_extract %2 : $CustomStruct, #CustomStruct.y
  %4 = struct_extract %3 : $InnerStruct, #InnerStruct.z
  %5 = struct_extract %4 : $Int64, #Int64._value
  return %5 : $Builtin.Int64
} // CHECK: Returns int: 3

// CHECK-LABEL: @interpretCustomStruct4
sil @interpretCustomStruct4 : $@convention(thin) () -> Builtin.Int1 {
bb0:
  %1 = function_ref @constructCustomStruct : $@convention(thin) () -> CustomStruct
  %2 = apply %1() : $@convention(thin) () -> CustomStruct
  %3 = struct_extract %2 : $CustomStruct, #CustomStruct.y
  %4 = struct_extract %3 : $InnerStruct, #InnerStruct.w
  %5 = struct_extract %4 : $Bool, #Bool._value
  return %5 : $Builtin.Int1
} // CHECK: Returns int: -1

// Test non-constant diagnostics.

// CHECK-LABEL: @interpretAndDiagnoseNonConstantVars
sil hidden @interpretAndDiagnoseNonConstantVars : $@convention(thin) (Int) -> () {
bb0(%0 : $Int):
  %4 = struct_extract %0 : $Int, #Int._value
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: encountered use of a variable not tracked by the evaluator
  %10 = tuple ()
  return %10 : $()
}

sil @$ss8readLine16strippingNewlineSSSgSb_tF : $@convention(thin) (Bool) -> @owned Optional<String>

// CHECK-LABEL: @interpretAndDiagnoseNonConstantCalls
sil @interpretAndDiagnoseNonConstantCalls : $@convention(thin) () -> () {
bb0:
  %0 = integer_literal $Builtin.Int1, -1
  %1 = struct $Bool (%0 : $Builtin.Int1)
  // function_ref readLine(strippingNewline:)
  %2 = function_ref @$ss8readLine16strippingNewlineSSSgSb_tF : $@convention(thin) (Bool) -> @owned Optional<String>
  %3 = apply %2(%1) : $@convention(thin) (Bool) -> @owned Optional<String>
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: encountered call to 'Swift.readLine(strippingNewline: Swift.Bool) -> Swift.Optional<Swift.String>' whose body is not available
  release_value %3 : $Optional<String>
  %5 = tuple ()
  return %5 : $()
}

// Test loop diagnostics.

// CHECK-LABEL: @interpretAndDiagnoseLoops
sil hidden @interpretAndDiagnoseLoops : $@convention(thin) () -> () {
bb0:
  br bb1

bb1:
  %3 = integer_literal $Builtin.Int64, 0
  %4 = integer_literal $Builtin.Int64, 100

  %5 = builtin "cmp_slt_Int64"(%3 : $Builtin.Int64, %4 : $Builtin.Int64) : $Builtin.Int1
  cond_br %5, bb2, bb3

bb2:
  br bb1
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: control-flow loop found during evaluation 

bb3:
  %10 = tuple ()
  return %10 : $()
}

// Test stack allocation and memory access.

// CHECK-LABEL: @interpretLoadStore
sil hidden @interpretLoadStore : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = alloc_stack $Builtin.Int64, var, name "i"
  %1 = integer_literal $Builtin.Int64, 11
  store %1 to %0 : $*Builtin.Int64
  %3 = load %0 : $*Builtin.Int64
  dealloc_stack %0 : $*Builtin.Int64
  return %3 : $Builtin.Int64
} // CHECK: Returns int: 11

// CHECK-LABEL: @interpretBeginEndAccess
sil hidden @interpretBeginEndAccess : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = alloc_stack $Builtin.Int64, var, name "i"
  %1 = integer_literal $Builtin.Int64, 11
  %3 = begin_access [modify] [static] %0 : $*Builtin.Int64
  store %1 to %3 : $*Builtin.Int64
  end_access %3 : $*Builtin.Int64
  %5 = load %0 : $*Builtin.Int64
  dealloc_stack %0 : $*Builtin.Int64
  return %5 : $Builtin.Int64
} // CHECK: Returns int: 11

// Test structs with mutating functions.

sil hidden @increment : $@convention(thin) (@inout Int32) -> () {
bb0(%0 : $*Int32):
  %2 = integer_literal $Builtin.Int32, 1
  %3 = begin_access [modify] [static] %0 : $*Int32
  %4 = struct_element_addr %3 : $*Int32, #Int32._value
  %5 = load %4 : $*Builtin.Int32
  %6 = integer_literal $Builtin.Int1, -1
  %7 = builtin "sadd_with_overflow_Int32"(%5 : $Builtin.Int32, %2 : $Builtin.Int32, %6 : $Builtin.Int1) : $(Builtin.Int32, Builtin.Int1)
  %8 = tuple_extract %7 : $(Builtin.Int32, Builtin.Int1), 0
  %9 = tuple_extract %7 : $(Builtin.Int32, Builtin.Int1), 1
  cond_fail %9 : $Builtin.Int1
  %11 = struct $Int32 (%8 : $Builtin.Int32)
  store %11 to %3 : $*Int32
  %13 = tuple ()
  end_access %3 : $*Int32
  %15 = tuple ()
  return %15 : $()
}

// CHECK-LABEL: @interpretIntInOut
sil hidden @interpretIntInOut : $@convention(thin) () -> Builtin.Int32 {
bb0:
  %0 = alloc_stack $Int32, var, name "i"
  %1 = integer_literal $Builtin.Int32, 13
  %2 = struct $Int32 (%1 : $Builtin.Int32)
  store %2 to %0 : $*Int32
  %4 = begin_access [modify] [static] %0 : $*Int32
  %5 = function_ref @increment : $@convention(thin) (@inout Int32) -> ()
  %6 = apply %5(%4) : $@convention(thin) (@inout Int32) -> ()
  end_access %4 : $*Int32

  %7 = load %0 : $*Int32
  %8 = struct_extract %7 : $Int32, #Int32._value
  dealloc_stack %0 : $*Int32
  return %8 : $Builtin.Int32
} // CHECK: Returns int: 14

// CHECK-LABEL: @interpretNoAliasingTest
sil hidden @interpretNoAliasingTest : $@convention(thin) () -> Builtin.Int32 {
bb0:
  %0 = alloc_stack $Int32, var, name "x"
  %1 = integer_literal $Builtin.Int32, 1
  %2 = struct $Int32 (%1 : $Builtin.Int32)
  store %2 to %0 : $*Int32
  %4 = alloc_stack $Int32, var, name "y"
  %5 = begin_access [read] [static] %0 : $*Int32
  store %2 to %4 : $*Int32
  end_access %5 : $*Int32
  %8 = begin_access [modify] [static] %0 : $*Int32
  %9 = function_ref @increment : $@convention(thin) (@inout Int32) -> ()
  %10 = apply %9(%8) : $@convention(thin) (@inout Int32) -> ()
  end_access %8 : $*Int32
  %12 = begin_access [read] [static] %0 : $*Int32
  %13 = load %12 : $*Int32
  end_access %12 : $*Int32
  %15 = begin_access [read] [static] %4 : $*Int32
  end_access %15 : $*Int32
  %17 = struct_extract %13 : $Int32, #Int32._value
  %18 = integer_literal $Builtin.Int1, -1
  %19 = builtin "sadd_with_overflow_Int32"(%17 : $Builtin.Int32, %1 : $Builtin.Int32, %18 : $Builtin.Int1) : $(Builtin.Int32, Builtin.Int1)
  %20 = tuple_extract %19 : $(Builtin.Int32, Builtin.Int1), 0
  %21 = tuple_extract %19 : $(Builtin.Int32, Builtin.Int1), 1
  cond_fail %21 : $Builtin.Int1
  dealloc_stack %4 : $*Int32
  dealloc_stack %0 : $*Int32
  return %20 : $Builtin.Int32
} // CHECK: Returns int: 3

// Test strings.

// CHECK-LABEL: @interpretStringLiteral
sil hidden @interpretStringLiteral : $@convention(thin) () -> Builtin.RawPointer {
bb0:
  %0 = string_literal utf8 "plain string"
  return %0 : $Builtin.RawPointer
} // CHECK: Returns string: "plain string"

// CHECK-LABEL: @interpretStringLiteralUnicode
sil hidden @interpretStringLiteralUnicode : $@convention(thin) () -> Builtin.RawPointer {
bb0:
  %0 = string_literal utf8 "\u{1F496}"
  return %0 : $Builtin.RawPointer
} // CHECK: Returns string: "💖"

// String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
// The semantics attribute is used by the interpreter.
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

// CHECK-LABEL: @interpretStringInitIntrinsic
sil hidden @interpretStringInitIntrinsic : $@convention(thin) () ->  @owned String {
bb0:
  %0 = string_literal utf8 "plain string"
  %1 = integer_literal $Builtin.Word, 12
  %2 = integer_literal $Builtin.Int1, -1
  %3 = metatype $@thin String.Type
  %4 = function_ref @$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
  return %5 : $String
} // CHECK: Returns string: "plain string"

// TODO: Provide a more descriptive note that mentions the actual error.
// CHECK-LABEL: @interpretAndDiagnoseStringInitError
sil hidden @interpretAndDiagnoseStringInitError: $@convention(thin) () ->  @owned String {
bb0:
  %0 = string_literal utf8 "\u{1F496}"
  %1 = integer_literal $Builtin.Word, 1  // The byte length of the literal is wrong.
  %2 = integer_literal $Builtin.Int1, 0
  %3 = metatype $@thin String.Type
  %4 = function_ref @$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
      // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: operation with invalid operands encountered during evaluation
  return %5 : $String
}

// String.append(_:_:)
// The semantics attribute is used by the interpreter.
sil [serialized] [_semantics "string.append"] @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()

// CHECK-LABEL: @interpretStringAppend
sil @interpretStringAppend: $@convention(thin) () -> @owned String {
bb0:
  %0 = alloc_stack $String, var, name "a"
  %1 = string_literal utf8 "a"
  %2 = integer_literal $Builtin.Word, 1
  %3 = integer_literal $Builtin.Int1, -1
  %4 = metatype $@thin String.Type
  %5 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = apply %5(%1, %2, %3, %4) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  store %6 to %0 : $*String
  %8 = metatype $@thin String.Type
  %9 = string_literal utf8 "b"
  %10 = integer_literal $Builtin.Word, 1
  %11 = integer_literal $Builtin.Int1, -1
  %12 = metatype $@thin String.Type
  %13 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %14 = apply %13(%9, %10, %11, %12) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %15 = begin_access [modify] [static] %0 : $*String
  // function_ref static String.append (_:_:)
  %16 = function_ref @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()
  %17 = apply %16(%14, %15) : $@convention(method) (@guaranteed String, @inout String) -> ()
  end_access %15 : $*String
  release_value %14 : $String
  %20 = begin_access [read] [static] %0 : $*String
  %21 = load %20 : $*String
  retain_value %21 : $String
  end_access %20 : $*String
  destroy_addr %0 : $*String
  dealloc_stack %0 : $*String
  return %21 : $String
} // CHECK: Returns string: "ab"

// CHECK-LABEL: @interpretStringAppendUnicode
sil @interpretStringAppendUnicode: $@convention(thin) () -> @owned String {
bb0:
  %0 = alloc_stack $String, var, name "a"
  %1 = string_literal utf8 "\u{1F1FA}"
  %2 = integer_literal $Builtin.Word, 4
  %3 = integer_literal $Builtin.Int1, 0
  %4 = metatype $@thin String.Type
  %5 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = apply %5(%1, %2, %3, %4) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  store %6 to %0 : $*String
  %8 = metatype $@thin String.Type
  %9 = string_literal utf8 "\u{1F1F8}"
  %10 = integer_literal $Builtin.Word, 4
  %11 = integer_literal $Builtin.Int1, 0
  %12 = metatype $@thin String.Type
  %13 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %14 = apply %13(%9, %10, %11, %12) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %15 = begin_access [modify] [static] %0 : $*String
  // function_ref static String.+= infix(_:_:)
  %16 = function_ref @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()
  %17 = apply %16(%14, %15) : $@convention(method) (@guaranteed String, @inout String) -> ()
  end_access %15 : $*String
  release_value %14 : $String
  %20 = begin_access [read] [static] %0 : $*String
  %21 = load %20 : $*String
  retain_value %21 : $String
  end_access %20 : $*String
  destroy_addr %0 : $*String
  dealloc_stack %0 : $*String
  return %21 : $String
} // CHECK: Returns string: "🇺🇸"

// Test Enums.

public enum Shape {
  case square(Int64)
  case rectangle(Int64, Int64)
}

// CHECK-LABEL: @interpretShapeArea
sil @interpretShapeArea : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = integer_literal $Builtin.Int64, 10
  %2 = struct $Int64 (%1 : $Builtin.Int64)
  %3 = enum $Shape, #Shape.square!enumelt.1, %2 : $Int64
  switch_enum %3 : $Shape, case #Shape.square!enumelt.1: bb1, case #Shape.rectangle!enumelt.1: bb2

bb1(%4 : $Int64):
  debug_value %4 : $Int64, let, name "side"
  %5 = struct_extract %4 : $Int64, #Int64._value
  %6 = struct_extract %4 : $Int64, #Int64._value
  %7 = integer_literal $Builtin.Int1, -1
  %8 = builtin "smul_with_overflow_Int64"(%5 : $Builtin.Int64, %6 : $Builtin.Int64, %7 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
  %9 = tuple_extract %8 : $(Builtin.Int64, Builtin.Int1), 0
  %10 = tuple_extract %8 : $(Builtin.Int64, Builtin.Int1), 1
  cond_fail %10 : $Builtin.Int1
  br bb3(%9 : $Builtin.Int64)

bb2(%15 : $(Int64, Int64)):
  %16 = tuple_extract %15 : $(Int64, Int64), 0
  %17 = tuple_extract %15 : $(Int64, Int64), 1
  debug_value %16 : $Int64, let, name "length"
  debug_value %17 : $Int64, let, name "width"
  %20 = struct_extract %16 : $Int64, #Int64._value // user: %23
  %21 = struct_extract %17 : $Int64, #Int64._value // user: %23
  %22 = integer_literal $Builtin.Int1, -1
  %23 = builtin "smul_with_overflow_Int64"(%20 : $Builtin.Int64, %21 : $Builtin.Int64, %22 : $Builtin.Int1) :             $(Builtin.Int64, Builtin.Int1)
  %24 = tuple_extract %23 : $(Builtin.Int64, Builtin.Int1), 0
  %25 = tuple_extract %23 : $(Builtin.Int64, Builtin.Int1), 1
  cond_fail %25 : $Builtin.Int1
  br bb3(%24 : $Builtin.Int64)

bb3(%30 : $Builtin.Int64):
    return %30 : $Builtin.Int64
} // CHECK: Returns int: 100

// Test inject_enum_addr instruction.

public enum Direction {
  case north
  case south
  case east
  case west
}

sil @isNorth : $@convention(thin) (@in_guaranteed Direction) -> Builtin.Int32 {
bb0(%0 : $*Direction):
  switch_enum_addr %0 : $*Direction, case #Direction.north!enumelt: bb1, default bb2

bb1:
  %3 = integer_literal $Builtin.Int32, 1
  br bb3(%3 : $Builtin.Int32)

bb2:
  %6 = integer_literal $Builtin.Int32, 0
  br bb3(%6 : $Builtin.Int32)

bb3(%9 : $Builtin.Int32):
  return %9 : $Builtin.Int32
}

// CHECK: @interpretTestInjectEnumAddr
sil hidden @interpretTestInjectEnumAddr : $@convention(thin) () -> Builtin.Int32 {
bb0:
  %1 = alloc_stack $Direction
  inject_enum_addr %1 : $*Direction, #Direction.north!enumelt
  %2 = function_ref @isNorth : $@convention(thin) (@in_guaranteed Direction) -> Builtin.Int32
  %3 = apply %2(%1) : $@convention(thin) (@in_guaranteed Direction) -> Builtin.Int32
  destroy_addr %1 : $*Direction
  dealloc_stack %1 : $*Direction
  return %3 : $Builtin.Int32
} // CHECK: Returns int: 1

// Test select_enum and select_enum_addr instructions.

// CHECK: @interpretTestSelectEnum
sil hidden @interpretTestSelectEnum : $@convention(thin) () -> Builtin.Int32 {
bb0:
  %1 = enum $Direction, #Direction.north!enumelt
  %2 = integer_literal $Builtin.Int32, 1
  %3 = integer_literal $Builtin.Int32, 0
  %4 = select_enum %1 : $Direction, case #Direction.north!enumelt: %2, default %3 : $Builtin.Int32
  return %4 : $Builtin.Int32
} // CHECK: Returns int: 1

// CHECK: @interpretTestSelectEnumAddr
sil hidden @interpretTestSelectEnumAddr : $@convention(thin) () -> Builtin.Int32 {
bb0:
  %1 = alloc_stack $Direction
  inject_enum_addr %1 : $*Direction, #Direction.north!enumelt
  %2 = integer_literal $Builtin.Int32, 1
  %3 = integer_literal $Builtin.Int32, 0
  %4 = select_enum_addr %1 : $*Direction, case #Direction.north!enumelt: %2, default %3 : $Builtin.Int32
  destroy_addr %1 : $*Direction
  dealloc_stack %1 : $*Direction
  return %4 : $Builtin.Int32
} // CHECK: Returns int: 1

// Test calling conventions.

// Test struct with a string property. The struct will be passed and returned
// @guaranteed when its methods are called.

struct S {
  var prop: String
}

sil hidden @initS : $@convention(thin) () -> @owned S {
bb0:
  %2 = string_literal utf8 "something"
  %3 = integer_literal $Builtin.Word, 9
  %4 = integer_literal $Builtin.Int1, -1
  %5 = metatype $@thin String.Type
  // String.init(_builtinStringLiteral:utf8CodeUnitCount:isASCII:)
  %6 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %7 = apply %6(%2, %3, %4, %5) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %12 = struct $S (%7 : $String)
  retain_value %12 : $S
  return %12 : $S
}

sil @getProp : $@convention(method) (@guaranteed S) -> @owned String {
bb0(%0 : $S):
  %2 = struct_extract %0 : $S, #S.prop
  retain_value %2 : $String
  return %2 : $String
}

// CHECK: @interpretGuaranteedConvention
sil @interpretGuaranteedConvention : $@convention(thin) () -> @owned String {
bb0:
  %1 = function_ref @initS : $@convention(thin) () -> @owned S
  %2 = apply %1() : $@convention(thin) () -> @owned S
  %4 = function_ref @getProp : $@convention(method) (@guaranteed S) -> @owned String
  %5 = apply %4(%2) : $@convention(method) (@guaranteed S) -> @owned String
  release_value %2 : $S
  return %5 : $String
} // CHECK: Returns string: "something"


// TODO: add tests for generic functions, generic structs and generic enums.

// A composite test that mimics the format specifier construction used by
// os log APIs.

enum IntFormat {
  case decimal
  case hex
  case octal
}

// getIntegerFormatSpecifier(IntFormat:isPrivate:bitWidth:isSigned:)
sil @getIntegerFormatSpecifier : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String {
bb0(%0 : $IntFormat, %1 : $Bool, %2 : $Int64, %3 : $Bool):
  %10 = alloc_stack $String, var, name "formatSpecifier"
  %11 = struct_extract %1 : $Bool, #Bool._value
  cond_br %11, bb1, bb2

bb1:
  %13 = string_literal utf8 "%{private}"
  %14 = integer_literal $Builtin.Word, 10
  %15 = integer_literal $Builtin.Int1, -1
  %16 = metatype $@thin String.Type
  %17 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %18 = apply %17(%13, %14, %15, %16) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  br bb3(%18 : $String)

bb2:
  %20 = string_literal utf8 "%{public}"
  %21 = integer_literal $Builtin.Word, 9
  %22 = integer_literal $Builtin.Int1, -1
  %23 = metatype $@thin String.Type
  %24 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %25 = apply %24(%20, %21, %22, %23) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  br bb3(%25 : $String)

bb3(%27 : $String):
  store %27 to %10 : $*String
  %29 = integer_literal $Builtin.Int64, 64
  %30 = struct_extract %2 : $Int64, #Int64._value
  %31 = builtin "cmp_eq_Int64"(%30 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
  %32 = struct $Bool (%31 : $Builtin.Int1)
  %33 = struct_extract %32 : $Bool, #Bool._value
  cond_br %33, bb4, bb5

bb4:
  %35 = metatype $@thin String.Type
  %36 = string_literal utf8 "ll"
  %37 = integer_literal $Builtin.Word, 2
  %38 = integer_literal $Builtin.Int1, -1
  %39 = metatype $@thin String.Type
  %40 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %41 = apply %40(%36, %37, %38, %39) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %42 = begin_access [modify] [static] %10 : $*String
  %43 = function_ref @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()
  %44 = apply %43(%41, %42) : $@convention(method) (@guaranteed String, @inout String) -> ()
  end_access %42 : $*String
  release_value %41 : $String
  br bb6

bb5:
  br bb6

bb6:
  switch_enum %0 : $IntFormat, case #IntFormat.hex!enumelt: bb7, case #IntFormat.octal!enumelt: bb8, default bb9

bb7:
  %50 = metatype $@thin String.Type
  %51 = string_literal utf8 "x"
  %52 = integer_literal $Builtin.Word, 1
  %53 = integer_literal $Builtin.Int1, -1
  %54 = metatype $@thin String.Type
  %55 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %56 = apply %55(%51, %52, %53, %54) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %57 = begin_access [modify] [static] %10 : $*String
  %58 = function_ref @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()
  %59 = apply %58(%56, %57) : $@convention(method) (@guaranteed String, @inout String) -> ()
  end_access %57 : $*String
  release_value %56 : $String
  br bb13

bb8:
  %63 = metatype $@thin String.Type
  %64 = string_literal utf8 "o"
  %65 = integer_literal $Builtin.Word, 1
  %66 = integer_literal $Builtin.Int1, -1
  %67 = metatype $@thin String.Type
  %68 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %69 = apply %68(%64, %65, %66, %67) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %70 = begin_access [modify] [static] %10 : $*String
  %71 = function_ref @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()
  %72 = apply %71(%69, %70) : $@convention(method) (@guaranteed String, @inout String) -> ()
  end_access %70 : $*String
  release_value %69 : $String
  br bb13

bb9:
  %76 = metatype $@thin String.Type
  %77 = struct_extract %3 : $Bool, #Bool._value
  cond_br %77, bb10, bb11

bb10:
  %79 = string_literal utf8 "d"
  %80 = integer_literal $Builtin.Word, 1
  %81 = integer_literal $Builtin.Int1, -1
  %82 = metatype $@thin String.Type
  %83 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %84 = apply %83(%79, %80, %81, %82) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  br bb12(%84 : $String)

bb11:
  %86 = string_literal utf8 "u"
  %87 = integer_literal $Builtin.Word, 1
  %88 = integer_literal $Builtin.Int1, -1
  %89 = metatype $@thin String.Type
  %90 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %91 = apply %90(%86, %87, %88, %89) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  br bb12(%91 : $String)

bb12(%93 : $String):
  %94 = begin_access [modify] [static] %10 : $*String
  %95 = function_ref @$sSS6appendyySSF : $@convention(method) (@guaranteed String, @inout String) -> ()
  %96 = apply %95(%93, %94) : $@convention(method) (@guaranteed String, @inout String) -> ()
  end_access %94 : $*String
  release_value %93 : $String
  br bb13

bb13:
  %100 = begin_access [read] [static] %10 : $*String
  %101 = load %100 : $*String
  retain_value %101 : $String
  end_access %100 : $*String
  destroy_addr %10 : $*String
  dealloc_stack %10 : $*String
  return %101 : $String
}

// CHECK-LABEL: @interpretGetPrivateInt64FormatString
sil @interpretGetPrivateInt64FormatString : $@convention(thin) () -> @owned String {
bb0:
  %2 = metatype $@thin IntFormat.Type
  %3 = enum $IntFormat, #IntFormat.decimal!enumelt
  %4 = integer_literal $Builtin.Int1, -1
  %5 = struct $Bool (%4 : $Builtin.Int1)
  %6 = integer_literal $Builtin.Int64, 64
  %7 = struct $Int64 (%6 : $Builtin.Int64)
  %8 = integer_literal $Builtin.Int1, -1
  %9 = struct $Bool (%8 : $Builtin.Int1)
  %10 = function_ref @getIntegerFormatSpecifier : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  %11 = apply %10(%3, %5, %7, %9) : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  return %11 : $String
} // CHECK: Returns string: "%{private}lld"

// CHECK-LABEL: @interpretGetPrivateHexInt64FormatString
sil @interpretGetPrivateHexInt64FormatString : $@convention(thin) () -> @owned String {
bb0:
  %2 = metatype $@thin IntFormat.Type
  %3 = enum $IntFormat, #IntFormat.hex!enumelt
  %4 = integer_literal $Builtin.Int1, -1
  %5 = struct $Bool (%4 : $Builtin.Int1)
  %6 = integer_literal $Builtin.Int64, 64
  %7 = struct $Int64 (%6 : $Builtin.Int64)
  %8 = integer_literal $Builtin.Int1, -1
  %9 = struct $Bool (%8 : $Builtin.Int1)
  %10 = function_ref @getIntegerFormatSpecifier : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  %11 = apply %10(%3, %5, %7, %9) : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  return %11 : $String
} // CHECK: Returns string: "%{private}llx"

// CHECK-LABEL: @interpretGetPublicOctalInt32FormatString
sil @interpretGetPublicOctalInt32FormatString : $@convention(thin) () -> @owned String {
bb0:
  %2 = metatype $@thin IntFormat.Type
  %3 = enum $IntFormat, #IntFormat.octal!enumelt
  %4 = integer_literal $Builtin.Int1, 0
  %5 = struct $Bool (%4 : $Builtin.Int1)
  %6 = integer_literal $Builtin.Int64, 32
  %7 = struct $Int64 (%6 : $Builtin.Int64)
  %8 = integer_literal $Builtin.Int1, -1
  %9 = struct $Bool (%8 : $Builtin.Int1)
  %10 = function_ref @getIntegerFormatSpecifier : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  %11 = apply %10(%3, %5, %7, %9) : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  return %11 : $String
} // CHECK: Returns string: "%{public}o"

// CHECK-LABEL: @interpretGetUInt64FormatString
sil @interpretGetUInt64FormatString : $@convention(thin) () -> @owned String {
bb0:
  %2 = metatype $@thin IntFormat.Type
  %3 = enum $IntFormat, #IntFormat.decimal!enumelt
  %4 = integer_literal $Builtin.Int1, 0
  %5 = struct $Bool (%4 : $Builtin.Int1)
  %6 = integer_literal $Builtin.Int64, 64
  %7 = struct $Int64 (%6 : $Builtin.Int64)
  %8 = integer_literal $Builtin.Int1, 0
  %9 = struct $Bool (%8 : $Builtin.Int1)
  %10 = function_ref @getIntegerFormatSpecifier : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  %11 = apply %10(%3, %5, %7, %9) : $@convention(thin) (IntFormat, Bool, Int64, Bool) -> @owned String
  return %11 : $String
} // CHECK: Returns string: "%{public}llu"

// String.percentEscapedString.getter
// The semantics attribute is used by the interpreter.
sil [serialized] [readonly] [_semantics "string.escapePercent.get"] @$sSS14OSLogPrototypeE20percentEscapedStringSSvg : $@convention(method) (@guaranteed String) -> @owned String

// CHECK-LABEL: @interpretStringPercentEscape
sil @interpretStringPercentEscape : $@convention(thin) () -> @owned String {
bb0:
  %1 = string_literal utf8 "a%"
  %2 = integer_literal $Builtin.Word, 2
  %3 = integer_literal $Builtin.Int1, -1
  %4 = metatype $@thin String.Type
  %5 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = apply %5(%1, %2, %3, %4) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %8 = function_ref @$sSS14OSLogPrototypeE20percentEscapedStringSSvg : $@convention(method) (@guaranteed String) -> @owned String
  %9 = apply %8(%6) : $@convention(method) (@guaranteed String) -> @owned String
  return %9 : $String
} // CHECK: Returns string: "a%%"

// CHECK-LABEL: @interpretEscapeMutiplePercent
sil @interpretEscapeMutiplePercent : $@convention(thin) () -> @owned String {
bb0:
  %1 = string_literal utf8 "%%%a% %%b%"
  %2 = integer_literal $Builtin.Word, 10
  %3 = integer_literal $Builtin.Int1, -1
  %4 = metatype $@thin String.Type
  %5 = function_ref @$sSS21_builtinStringLiteral17utf8CodeUnitCount7isASCIISSBp_BwBi1_tcfC : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %6 = apply %5(%1, %2, %3, %4) : $@convention(method) (Builtin.RawPointer, Builtin.Word, Builtin.Int1, @thin String.Type) -> @owned String
  %8 = function_ref @$sSS14OSLogPrototypeE20percentEscapedStringSSvg : $@convention(method) (@guaranteed String) -> @owned String
  %9 = apply %8(%6) : $@convention(method) (@guaranteed String) -> @owned String
  return %9 : $String
} // CHECK: Returns string: "%%%%%%a%% %%%%b%%"

// Tests for Ownership SIL.

// CHECK-LABEL: @interpretDestructureInt64
sil [ossa] @interpretDestructureInt64 : $@convention(thin) () -> Builtin.Int64 {
  %1 = integer_literal $Builtin.Int64, 12
  %2 = struct $Int64 (%1 : $Builtin.Int64)
  %3 = destructure_struct %2 : $Int64
  return %3 : $Builtin.Int64
} // CHECK: Returns int: 12

struct IntPair {
  var first: Builtin.Int64
  var second: Builtin.Int64
}

// CHECK-LABEL: @interpretIntPairStruct
sil [ossa] @interpretIntPairStruct : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 17
  %1 = integer_literal $Builtin.Int64, 34
  %2 = struct $IntPair (%0: $Builtin.Int64, %1: $Builtin.Int64)
  (%3, %4) = destructure_struct %2 : $IntPair
  return %4 : $Builtin.Int64
} // CHECK: Returns int: 34

sil [ossa] @constructCustomStructOSSA : $@convention(thin) () -> CustomStruct {
bb0:
  %1 = integer_literal $Builtin.Int64, 11
  %2 = struct $Int64 (%1 : $Builtin.Int64)
  %3 = integer_literal $Builtin.Int64, 12
  %4 = struct $Int64 (%3 : $Builtin.Int64)
  %6 = integer_literal $Builtin.Int64, 13
  %7 = struct $Int64 (%6 : $Builtin.Int64)
  %8 = integer_literal $Builtin.Int1, 0
  %9 = struct $Bool (%8 : $Builtin.Int1)

  %10 = struct $InnerStruct (%7 : $Int64, %9 : $Bool)
  %11 = tuple (%2 : $Int64, %4 : $Int64)
  %12 = struct $CustomStruct (%11 : $(Int64, Int64), %10 : $InnerStruct)
  return %12 : $CustomStruct
}

// CHECK-LABEL: @interpretCustomStructOSSA
sil [ossa] @interpretCustomStructOSSA : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = function_ref @constructCustomStructOSSA : $@convention(thin) () -> CustomStruct
  %2 = apply %1() : $@convention(thin) () -> CustomStruct
  (%3, %4) = destructure_struct %2 : $CustomStruct
  (%5, %6) = destructure_tuple %3 : $(Int64, Int64)
  (%7, %8) = destructure_struct %4 : $InnerStruct
  %9 = destructure_struct %5 : $Int64
  %10 = destructure_struct %6 : $Int64
  %11 = destructure_struct %7 : $Int64
  %12 = destructure_struct %8 : $Bool
  cond_fail %12 : $Builtin.Int1

  %13 = integer_literal $Builtin.Int1, -1
  %14 = builtin "sadd_with_overflow_Int64"(%9 : $Builtin.Int64, %10 : $Builtin.Int64, %13 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
  (%15, %16) = destructure_tuple %14 : $(Builtin.Int64, Builtin.Int1)
  cond_fail %16 : $Builtin.Int1

  %17 = builtin "sadd_with_overflow_Int64"(%15 : $Builtin.Int64, %11 : $Builtin.Int64, %13 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
  (%18, %19) = destructure_tuple %17 : $(Builtin.Int64, Builtin.Int1)
  cond_fail %19 : $Builtin.Int1
  return %18 : $Builtin.Int64
} // CHECK: Returns int: 36

// Tests for builtin "ptrtoint_Word", which is supported only for string
// constants in order to handle 'StaticString' construction.

// CHECK-LABEL: @interpretPtrToInt
sil @interpretPtrToInt : $@convention(thin) () -> Builtin.Word {
  %0 = string_literal utf8 "Fatal error"
  %1 = builtin "ptrtoint_Word"(%0 : $Builtin.RawPointer) : $Builtin.Word
  return %1 : $Builtin.Word
} // CHECK: Returns string: "Fatal error"

// CHECK-LABEL: @interpretStaticStringInit
sil @interpretStaticStringInit : $@convention(thin) () -> Builtin.Word {
  %0 = string_literal utf8 "static error message"
  %1 = integer_literal $Builtin.Word, 11
  %2 = builtin "ptrtoint_Word"(%0 : $Builtin.RawPointer) : $Builtin.Word
  %3 = integer_literal $Builtin.Int8, 2
  %4 = struct $StaticString (%2 : $Builtin.Word, %1 : $Builtin.Word, %3 : $Builtin.Int8)
  %5 = struct_extract %4 : $StaticString, #StaticString._startPtrOrData
  return %5 : $Builtin.Word
} // CHECK: Returns string: "static error message"

// Tests for builtin "assert_configuration". Constant evaluator evaluates this
// builtin to 0, meaning that the the configuration is "debug".

// CHECK-LABEL: @interpretAssertConfiguration
sil @interpretAssertConfiguration : $@convention(thin) () -> Builtin.Int32 {
  %0 = builtin "assert_configuration"() : $Builtin.Int32
  return %0 : $Builtin.Int32
} // CHECK: Returns int: 0

// Tests for "assertionFailure" stdlib functions. Such functions have the
// @_semantics attribute: "programtermination_point"

sil [noinline] [_semantics "programtermination_point"] [canonical] @$assertionFailure : $@convention(thin) (StaticString, StaticString, UInt64) -> Never

// CHECK-LABEL: @interpretAssertionFailure
sil @interpretAssertionFailure : $@convention(thin) () -> Never {
  // Construct error prefix.
  %0 = string_literal utf8 "error-prefix"
  %1 = integer_literal $Builtin.Word, 12
  %2 = builtin "ptrtoint_Word"(%0 : $Builtin.RawPointer) : $Builtin.Word
  %3 = integer_literal $Builtin.Int8, 2
  %4 = struct $StaticString (%2 : $Builtin.Word, %1 : $Builtin.Word, %3 : $Builtin.Int8)

  // Construct error message.
  %10 = string_literal utf8 "message"
  %11 = integer_literal $Builtin.Word, 7
  %12 = builtin "ptrtoint_Word"(%10 : $Builtin.RawPointer) : $Builtin.Word
  %13 = integer_literal $Builtin.Int8, 2
  %14 = struct $StaticString (%12 : $Builtin.Word, %11 : $Builtin.Word, %13 : $Builtin.Int8)

  // Construct line number.
  %20 = integer_literal $Builtin.Int64, 1208
  %21 = struct $UInt64 (%20 : $Builtin.Int64)

  %22 = function_ref @$assertionFailure : $@convention(thin) (StaticString, StaticString, UInt64) -> Never
  %23 = apply %22(%4, %14, %21) : $@convention(thin) (StaticString, StaticString, UInt64) -> Never
    // CHECK: {{.*}}:[[@LINE-1]]:{{.*}}: note: error-prefix: message
  unreachable
}

// Tests for arrays.

// Array.init()
sil [serialized] [_semantics "array.init.empty"] @$sS2ayxGycfC : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>

// _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)

sil @interpretArrayInit : $@convention(thin) () -> @owned Array<Int> {
bb0:
  %0 = metatype $@thin Array<Int>.Type
  // function_ref Array.init()
  %1 = function_ref @$sS2ayxGycfC : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>
  %2 = apply %1<Int>(%0) : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>
  return %2 : $Array<Int>
} // CHECK: Returns Array<Int>
  // CHECK: size: 0 contents []

sil [ossa] @interpretEmptyArrayLiteral : $@convention(thin) () -> @owned Array<String> {
bb0:
  %0 = integer_literal $Builtin.Word, 0
  // function_ref _allocateUninitializedArray<A>(_:)
  %1 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %2 = apply %1<String>(%0) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  (%3, %4) = destructure_tuple %2 : $(Array<String>, Builtin.RawPointer)
  return %3 : $Array<String>
} // CHECK: Returns Array<String>
  // CHECK: size: 0 contents []

sil [ossa] @initializeArrayWithLiterals : $@convention(thin) () -> @owned Array<Int64> {
bb0:
  %0 = integer_literal $Builtin.Int64, 11 // element 1
  %1 = struct $Int64 (%0 : $Builtin.Int64)
  %2 = integer_literal $Builtin.Int64, 12  // element 2
  %3 = struct $Int64 (%2 : $Builtin.Int64)
  %4 = integer_literal $Builtin.Int64, 14 // element 3
  %5 = struct $Int64 (%4 : $Builtin.Int64)

  %6 = integer_literal $Builtin.Word, 3 // array literal size
  // function_ref _allocateUninitializedArray<A>(_:)
  %7 = function_ref @$ss27_allocateUninitializedArrayySayxG_BptBwlF : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  %8 = apply %7<Int64>(%6) : $@convention(thin) <τ_0_0> (Builtin.Word) -> (@owned Array<τ_0_0>, Builtin.RawPointer)
  (%9, %10) = destructure_tuple %8 : $(Array<Int64>, Builtin.RawPointer)
  %11 = pointer_to_address %10 : $Builtin.RawPointer to [strict] $*Int64
  store %1 to [trivial] %11 : $*Int64
  %13 = integer_literal $Builtin.Word, 1 // Index: 1
  %14 = index_addr %11 : $*Int64, %13 : $Builtin.Word
  store %3 to [trivial] %14 : $*Int64
  %16 = integer_literal $Builtin.Word, 2 // Index: 2
  %17 = index_addr %11 : $*Int64, %16 : $Builtin.Word
  store %5 to [trivial] %17 : $*Int64
  return %9 : $Array<Int64>
}

sil [ossa] @interpretArrayLiteral : $@convention(thin) () -> @owned Array<Int64> {
bb0:
  %7 = function_ref @initializeArrayWithLiterals : $@convention(thin) () -> @owned Array<Int64>
  %8 = apply %7() : $@convention(thin) () -> @owned Array<Int64>
  return %8 : $Array<Int64>
} // CHECK: Returns Array<Int64>
  // CHECK: size: 3
  // CHECK: agg: 1 elt: int: 11
  // CHECK: agg: 1 elt: int: 12
  // CHECK: agg: 1 elt: int: 14

// Array.append(_:)
sil [serialized] [_semantics "array.append_element"] @$sSa6appendyyxnF : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()

sil [ossa] @interpretArrayAppend : $@convention(thin) () -> @owned Array<Int64> {
  %0 = integer_literal $Builtin.Int64, 71
  %1 = struct $Int64 (%0 : $Builtin.Int64)
  %2 = alloc_stack $Array<Int64>, var, name "a"
  %3 = metatype $@thin Array<Int64>.Type
  // function_ref Array.init()
  %4 = function_ref @$sS2ayxGycfC : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>
  %5 = apply %4<Int64>(%3) : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>
  store %5 to [init] %2 : $*Array<Int64>
  %10 = alloc_stack $Int64
  store %1 to [trivial] %10 : $*Int64
  // function_ref Array.append(_:)
  %13 = function_ref @$sSa6appendyyxnF : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()
  %14 = apply %13<Int64>(%10, %2) : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()
  dealloc_stack %10 : $*Int64
  %18 = load [copy] %2 : $*Array<Int64>
  destroy_addr %2 : $*Array<Int64>
  dealloc_stack %2 : $*Array<Int64>
  return %18 : $Array<Int64>
} // CHECK: Returns Array<Int64>
  // CHECK: size: 1
  // CHECK: agg: 1 elt: int: 71

sil [ossa] @interpretArrayAppendNonEmpty : $@convention(thin) () -> @owned Array<Int64> {
bb0:
  %0 = integer_literal $Builtin.Int64, 100
  %1 = struct $Int64 (%0 : $Builtin.Int64)
  %2 = alloc_stack $Array<Int64>, var, name "a"
  %3 = metatype $@thin Array<Int64>.Type
  %4 = function_ref @initializeArrayWithLiterals : $@convention(thin) () -> @owned Array<Int64>
  %5 = apply %4() : $@convention(thin) () -> @owned Array<Int64>
  store %5 to [init] %2 : $*Array<Int64>
  %10 = alloc_stack $Int64
  store %1 to [trivial] %10 : $*Int64
  // function_ref Array.append(_:)
  %13 = function_ref @$sSa6appendyyxnF : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()
  %14 = apply %13<Int64>(%10, %2) : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()
  dealloc_stack %10 : $*Int64
  %18 = load [copy] %2 : $*Array<Int64>
  destroy_addr %2 : $*Array<Int64>
  dealloc_stack %2 : $*Array<Int64>
  return %18 : $Array<Int64>
} // CHECK: Returns Array<Int64>
  // CHECK: size: 4
  // CHECK: agg: 1 elt: int: 11
  // CHECK: agg: 1 elt: int: 12
  // CHECK: agg: 1 elt: int: 14
  // CHECK: agg: 1 elt: int: 100

/// Test appending of a static string to an array. The construction of a static
/// string is a bit complicated due to the use of instructions like "ptrtoint".
/// This tests that array append works with such complex constant values as well.
sil @interpretArrayAppendStaticString : $@convention(thin) () -> @owned Array<StaticString> {
  %0 = string_literal utf8 "constant" // string to be appended.

  // Initialize an empty array
  %2 = alloc_stack $Array<StaticString>, var, name "a"
  %3 = metatype $@thin Array<StaticString>.Type
  // function_ref Array.init()
  %4 = function_ref @$sS2ayxGycfC : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>
  %5 = apply %4<StaticString>(%3) : $@convention(method) <τ_0_0> (@thin Array<τ_0_0>.Type) -> @owned Array<τ_0_0>
  store %5 to %2 : $*Array<StaticString>

  // Initialize a static string.
  %6 = integer_literal $Builtin.Word, 8
  %7 = builtin "ptrtoint_Word"(%0 : $Builtin.RawPointer) : $Builtin.Word
  %8 = integer_literal $Builtin.Int8, 2
  %9 = struct $StaticString (%7 : $Builtin.Word, %6 : $Builtin.Word, %8 : $Builtin.Int8)

  %10 = alloc_stack $StaticString
  store %9 to %10 : $*StaticString
  // function_ref Array.append(_:)
  %13 = function_ref @$sSa6appendyyxnF : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()
  %14 = apply %13<StaticString>(%10, %2) : $@convention(method) <τ_0_0> (@in τ_0_0, @inout Array<τ_0_0>) -> ()
  dealloc_stack %10 : $*StaticString
  %18 = load %2 : $*Array<StaticString>
  destroy_addr %2 : $*Array<StaticString>
  dealloc_stack %2 : $*Array<StaticString>
  return %18 : $Array<StaticString>
} // CHECK: Returns Array<StaticString>
  // CHECK: size: 1
  // CHECK: string: "constant"