test/SILOptimizer/constant_propagation.sil

// RUN: %target-sil-opt -enable-sil-verify-all %s -diagnostic-constant-propagation | %FileCheck %s
// RUN: %target-sil-opt -enable-sil-verify-all %s -performance-constant-propagation | %FileCheck %s

import Swift
import Builtin

struct UInt {
  var value: Builtin.Word
}
struct Int {
  var value: Builtin.Word
}
struct Bool {
  var value: Builtin.Int1
}
struct Int64 {
  var value: Builtin.Int64
}
struct UInt64 {
  var value: Builtin.Int64
}

sil @count_leading_zeros_corner_case : $@convention(thin) () -> Builtin.Int64 {
bb0:
 %zero64 = integer_literal $Builtin.Int64, 0
 %zero1 = integer_literal $Builtin.Int1, 0
 %ctlz = builtin "int_ctlz_Int64"(%zero64 : $Builtin.Int64, %zero1 : $Builtin.Int1) : $Builtin.Int64
 return %ctlz : $Builtin.Int64

// CHECK-LABEL: sil @count_leading_zeros_corner_case
// CHECK-NOT: integer_literal $Builtin.Int64, 0
// CHECK-NOT: integer_literal $Builtin.Int1, 0
// CHECK-NOT: builtin
// CHECK: [[RES:%.*]] = integer_literal $Builtin.Int64, 64
// CHECK-NEXT: return [[RES]] : $Builtin.Int64
}

sil @count_leading_zeros : $@convention(thin) () -> Builtin.Int64 {
bb0:
 %zero64 = integer_literal $Builtin.Int64, 2
 %zero1 = integer_literal $Builtin.Int1, 0
 %ctlz = builtin "int_ctlz_Int64"(%zero64 : $Builtin.Int64, %zero1 : $Builtin.Int1) : $Builtin.Int64
 return %ctlz : $Builtin.Int64

// CHECK-LABEL: sil @count_leading_zeros
// CHECK-NOT: integer_literal $Builtin.Int64, 2
// CHECK-NOT: integer_literal $Builtin.Int1, 0
// CHECK-NOT: builtin
// CHECK: [[RES:%.*]] = integer_literal $Builtin.Int64, 62
// CHECK-NEXT: return [[RES]] : $Builtin.Int64
}

sil @count_trailing_zeros_corner_case : $@convention(thin) () -> Builtin.Int64 {
bb0:
 %zero64 = integer_literal $Builtin.Int64, 0
 %zero1 = integer_literal $Builtin.Int1, 0
 %cttz = builtin "int_cttz_Int64"(%zero64 : $Builtin.Int64, %zero1 : $Builtin.Int1) : $Builtin.Int64
 return %cttz : $Builtin.Int64

// CHECK-LABEL: sil @count_trailing_zeros_corner_case
// CHECK-NOT: integer_literal $Builtin.Int64, 0
// CHECK-NOT: integer_literal $Builtin.Int1, 0
// CHECK-NOT: builtin
// CHECK: [[RES:%.*]] = integer_literal $Builtin.Int64, 64
// CHECK-NEXT: return [[RES]] : $Builtin.Int64
}

sil @count_trailing_zeros : $@convention(thin) () -> Builtin.Int64 {
bb0:
 %zero64 = integer_literal $Builtin.Int64, 2
 %zero1 = integer_literal $Builtin.Int1, 0
 %cttz = builtin "int_cttz_Int64"(%zero64 : $Builtin.Int64, %zero1 : $Builtin.Int1) : $Builtin.Int64
 return %cttz : $Builtin.Int64

// CHECK-LABEL: sil @count_trailing_zeros
// CHECK-NOT: integer_literal $Builtin.Int64, 2
// CHECK-NOT: integer_literal $Builtin.Int1, 0
// CHECK-NOT: builtin
// CHECK: [[RES:%.*]] = integer_literal $Builtin.Int64, 1
// CHECK-NEXT: return [[RES]] : $Builtin.Int64
}

// Compute an expression using a chain of arithmetic with overflow instructions: 2 * (2 + 3) - 3
sil @fold_arithmetic_with_overflow : $@convention(thin) () -> Builtin.Int64 {
bb0:
 %0 = integer_literal $Builtin.Int64, 2
 %110 = integer_literal $Builtin.Int64, 3
 %18 = builtin "int_sadd_with_overflow_Int64"(%0 : $Builtin.Int64, %110 : $Builtin.Int64) : $(Builtin.Int64, Builtin.Int1)
 %19 = tuple_extract %18 : $(Builtin.Int64, Builtin.Int1), 0
 %20 = builtin "int_smul_with_overflow_Int64"(%0 : $Builtin.Int64, %19 : $Builtin.Int64) : $(Builtin.Int64, Builtin.Int1)
 %21 = tuple_extract %20 : $(Builtin.Int64, Builtin.Int1), 0
 %22 = builtin "int_ssub_with_overflow_Int64"(%21 : $Builtin.Int64, %110 : $Builtin.Int64) : $(Builtin.Int64, Builtin.Int1)
 %23 = tuple_extract %22 : $(Builtin.Int64, Builtin.Int1), 0
 return %23 : $Builtin.Int64

// CHECK-LABEL: sil @fold_arithmetic_with_overflow
// CHECK-NOT: integer_literal $Builtin.Int64, 2
// CHECK-NOT: integer_literal $Builtin.Int64, 3
// CHECK-NOT: integer_literal $Builtin.Int64, 0
// CHECK-NOT: builtin
// CHECK: [[RES:%.*]] = integer_literal $Builtin.Int64, 7
// CHECK-NEXT: return [[RES]] : $Builtin.Int64
}

// Fold casts. (This test assumes that DCE does not run, otherwise the unreachable blocks will get removed.)
sil @fold_trunc : $@convention(thin) () -> Builtin.Int64 {
bb0:
 %0 = integer_literal $Builtin.Int128, 22
 %2 = builtin "trunc_Int128_Int64"(%0 : $Builtin.Int128) : $Builtin.Int64
 br bb4(%2 : $Builtin.Int64)

bb1:
 %3 = integer_literal $Builtin.Int8, 23
 %5 = builtin "sext_Int8_Int64"(%3 : $Builtin.Int8) : $Builtin.Int64
 br bb4(%5 : $Builtin.Int64)

bb2:
 %6 = integer_literal $Builtin.Int8, 24
 %8 = builtin "zext_Int8_Int64"(%6 : $Builtin.Int8) : $Builtin.Int64
 br bb4(%8 : $Builtin.Int64)

bb4(%100 : $Builtin.Int64):
 return %100 : $Builtin.Int64
// CHECK-LABEL: sil @fold_trunc
// CHECK-NOT: integer_literal $Builtin.Int128, 22
// CHECK: integer_literal $Builtin.Int64, 22
// CHECK-NOT: integer_literal $Builtin.Int8, 23
// CHECK: integer_literal $Builtin.Int64, 23
// CHECK-NOT: integer_literal $Builtin.Int8, 24
// CHECK: integer_literal $Builtin.Int64, 24
}

sil @test_tuple_extract_folding : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 5
  %1 = integer_literal $Builtin.Int1, 0
  %2 = tuple (%0 : $Builtin.Int64, %1 : $Builtin.Int1)
  %3 = tuple_extract %2 : $(Builtin.Int64, Builtin.Int1), 0
  return %3 : $Builtin.Int64
// CHECK-LABEL: sil @test_tuple_extract_folding
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int64, 5
// CHECK-NEXT: return %0 : $Builtin.Int64
// CHECK-NEXT: }
}

sil @test_struct_extract_folding_first : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 2
  %1 = struct $Int64 (%0 : $Builtin.Int64)
  %2 = struct_extract %1 : $Int64, #Int64.value
  return %2 : $Builtin.Int64
// CHECK-LABEL: sil @test_struct_extract_folding_first
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int64, 2
// CHECK-NEXT: return %0 : $Builtin.Int64
// CHECK-NEXT: }
}

struct TwoValueStruct {
  var a : Builtin.Int64
  var b : Builtin.Int64
}

sil @test_struct_extract_folding_second : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 2
  %1 = integer_literal $Builtin.Int64, 20
  %2 = struct $TwoValueStruct (%0 : $Builtin.Int64, %1 : $Builtin.Int64)
  %3 = struct_extract %2 : $TwoValueStruct, #TwoValueStruct.b
  return %3 : $Builtin.Int64
// CHECK-LABEL: sil @test_struct_extract_folding_second
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int64, 20
// CHECK-NEXT: return %0 : $Builtin.Int64
// CHECK-NEXT: }
}

sil @test_struct_extract_folding_third : $() -> Bool {
bb0:
  %0 = integer_literal $Builtin.Int64, 200
  %a = integer_literal $Builtin.Int1, 1
  %1 = struct $Bool (%a : $Builtin.Int1)
  %2 = tuple (%0 : $Builtin.Int64, %1 : $Bool)
  %3 = tuple_extract %2 : $(Builtin.Int64, Bool), 1
  return %3 : $Bool

// CHECK-LABEL: sil @test_struct_extract_folding_third
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int1, -1
// CHECK-NEXT: %1 = struct $Bool
// CHECK-NEXT: return %1 : $Bool
// CHECK-NEXT: }
}

sil @testChainingCCP : $@convention(thin) () -> Builtin.Int1 {
bb0:
  %2 = integer_literal $Builtin.Int64, 0
  %3 = struct $Int64 (%2 : $Builtin.Int64)
  %4 = struct_extract %3 : $Int64, #Int64.value
  %5 = builtin "trunc_Int64_Int1"(%4 : $Builtin.Int64) : $Builtin.Int1
  return %5 : $Builtin.Int1

// CHECK-LABEL: sil @testChainingCCP
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int1, 0
// CHECK-NEXT: return %0 : $Builtin.Int1
// CHECK-NEXT: }
}

sil @testDivision : $@convention(thin) () -> Builtin.Int8 {
bb0:
  %1 = integer_literal $Builtin.Int8, 6
  %2 = integer_literal $Builtin.Int8, 3
  %3 = builtin "sdiv_Int8"(%1: $Builtin.Int8, %2: $Builtin.Int8) : $Builtin.Int8
  return %3 : $Builtin.Int8

// CHECK-LABEL: sil @testDivision
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int8, 2
// CHECK-NEXT: return %0 : $Builtin.Int8
// CHECK-NEXT: }
}

sil @testRem : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %1 = integer_literal $Builtin.Int64, 10
  %2 = integer_literal $Builtin.Int64, 2
  %3 = builtin "urem_Int64"(%1 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64
  return %3 : $Builtin.Int64

// CHECK-LABEL: sil @testRem
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int64, 0
// CHECK-NEXT: return %0 : $Builtin.Int64
// CHECK-NEXT: }
}

sil @testFoldingNonNegativeSignedInt : $@convention(thin) (Builtin.Int64) -> () {
bb0(%0 : $Builtin.Int64):
  %zero  = integer_literal $Builtin.Int64, 0
  %non_neg = builtin "assumeNonNegative_Int64"(%0 : $Builtin.Int64) : $Builtin.Int64
  %compare_slt = builtin "cmp_slt_Int64"(%non_neg : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1
  %compare_sgt = builtin "cmp_sgt_Int64"(%zero : $Builtin.Int64, %non_neg : $Builtin.Int64) : $Builtin.Int1
  %compare_sge = builtin "cmp_sge_Int64"(%non_neg : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1
  %compare_sle = builtin "cmp_sle_Int64"(%zero : $Builtin.Int64, %non_neg : $Builtin.Int64) : $Builtin.Int1
  %5 = tuple ()
  return %5 : $()
// CHECK-LABEL: sil @testFoldingNonNegativeSignedInt
// CHECK: bb
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: tuple
// CHECK-NEXT: return
}

sil @testFoldingIntBinaryPredicates : $@convention(thin) (Builtin.Int32) -> () {
bb0(%0 : $Builtin.Int32):
  %1 = integer_literal $Builtin.Int1, 1
  %2 = integer_literal $Builtin.Int1, 0
  // This is Int32.Max
  %3 = integer_literal $Builtin.Int32, 2147483647 
  %4 = builtin "cmp_eq_Int1"(%1 : $Builtin.Int1, %2 : $Builtin.Int1) : $Builtin.Int1
  %11 = integer_literal $Builtin.Int32, 21
  %12 = integer_literal $Builtin.Int32, 12
  %14 = builtin "cmp_ne_Int32"(%11 : $Builtin.Int32, %12 : $Builtin.Int32) : $Builtin.Int1
  %16 = builtin "cmp_sgt_Int32"(%12 : $Builtin.Int32, %11 : $Builtin.Int32) : $Builtin.Int1
  %17 = builtin "cmp_ult_Int32"(%12 : $Builtin.Int32, %11 : $Builtin.Int32) : $Builtin.Int1
  // Int32.Max < x
  %18 = builtin "cmp_slt_Int32"(%3 : $Builtin.Int32, %0 : $Builtin.Int32) : $Builtin.Int1
  // x > Int32.Max
  %19 = builtin "cmp_sgt_Int32"(%0 : $Builtin.Int32, %3 : $Builtin.Int32) : $Builtin.Int1
  // Int32.Max >= x
  %20 = builtin "cmp_sge_Int32"(%3 : $Builtin.Int32, %0 : $Builtin.Int32) : $Builtin.Int1
  // x <= Int32.Max
  %21 = builtin "cmp_sle_Int32"(%0 : $Builtin.Int32, %3 : $Builtin.Int32) : $Builtin.Int1

  %5 = tuple ()
  return %5 : $()
// CHECK-LABEL: sil @testFoldingIntBinaryPredicates
// CHECK: bb
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: tuple
// CHECK-NEXT: return
}

sil @testFoldingUnsignedIntComparisons : $@convention(thin) (Builtin.Int32) -> () {
bb0(%0 : $Builtin.Int32):
  %2 = integer_literal $Builtin.Int1, 0
  %3 = integer_literal $Builtin.Int32, 0
  // unsigned value is never less then 0
  %18 = builtin "cmp_ult_Int32"(%0 : $Builtin.Int32, %3 : $Builtin.Int32) : $Builtin.Int1
  // unsigned value is always >= 0
  %19 = builtin "cmp_uge_Int32"(%0 : $Builtin.Int32, %3 : $Builtin.Int32) : $Builtin.Int1
  // 0 is always <= an unsigned value
  %20 = builtin "cmp_ule_Int32"(%3 : $Builtin.Int32, %0 : $Builtin.Int32) : $Builtin.Int1
  // 0 is never greater than an unsigned value
  %21 = builtin "cmp_ugt_Int32"(%3 : $Builtin.Int32, %0 : $Builtin.Int32) : $Builtin.Int1
  %5 = tuple ()
  return %5 : $()
// CHECK-LABEL: sil @testFoldingUnsignedIntComparisons
// CHECK: bb0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: tuple
// CHECK-NEXT: return
}

// fold_binary_bitwise
sil @fold_binary_bitwise : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, 1          // users: %7, %6, %5
  %1 = integer_literal $Builtin.Int64, 0          // users: %7, %6, %5
  %5 = builtin "and_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int64
  %6 = builtin "or_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int64
  %7 = builtin "xor_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int64 // user: %8
  return %7 : $Builtin.Int64                      // id: %8

// CHECK-LABEL: sil @fold_binary_bitwise
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int64, 0
// CHECK_NEXT: %1 = integer_literal $Builtin.Int64, 1
// CHECK_NEXT: %2 = integer_literal $Builtin.Int64, 1
// CHECK_NEXT: return %2 : $Builtin.Int64
}

// For any x of the same size as Int.max and n>=1 , (x>>n) is always <= Int.max,
// that is (x>>n) <= Int.max and Int.max >= (x>>n) are true.
// At the same time (x>>n) > Int.max and Int.max < (x>>n) is always false.
sil @fold_cmp_lshr_with_IntMax : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
bb0(%0 : $Builtin.Int64):
  %1 = integer_literal $Builtin.Int64, 9223372036854775807 
  %2 = integer_literal $Builtin.Int64, 1
  %3 = integer_literal $Builtin.Int64, 3
  %4 = integer_literal $Builtin.Int64, 0
  %5 = integer_literal $Builtin.Int64, -2

  // x >> 1
  %9 = builtin "lshr_Int64"(%0 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64

  %10 = builtin "cmp_sge_Int64"(%1 : $Builtin.Int64, %9 : $Builtin.Int64) : $Builtin.Int1
  %11 = builtin "cmp_uge_Int64"(%1 : $Builtin.Int64, %9 : $Builtin.Int64) : $Builtin.Int1
  %12 = builtin "cmp_sle_Int64"(%9 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %13 = builtin "cmp_ule_Int64"(%9 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  %20 = builtin "cmp_slt_Int64"(%1 : $Builtin.Int64, %9 : $Builtin.Int64) : $Builtin.Int1
  %21 = builtin "cmp_ult_Int64"(%1 : $Builtin.Int64, %9 : $Builtin.Int64) : $Builtin.Int1
  %22 = builtin "cmp_sgt_Int64"(%9 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %23 = builtin "cmp_ugt_Int64"(%9 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  // x >> 3
  %29 = builtin "lshr_Int64"(%0 : $Builtin.Int64, %3 : $Builtin.Int64) : $Builtin.Int64

  %30 = builtin "cmp_sge_Int64"(%1 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
  %31 = builtin "cmp_uge_Int64"(%1 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
  %32 = builtin "cmp_sle_Int64"(%29 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %33 = builtin "cmp_ule_Int64"(%29 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  %40 = builtin "cmp_slt_Int64"(%1 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
  %41 = builtin "cmp_ult_Int64"(%1 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
  %42 = builtin "cmp_sgt_Int64"(%29 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %43 = builtin "cmp_ugt_Int64"(%29 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  // Check that this peephole does not happen if the shift amount is < 1

  // x >> 0 (i.e. x shifted by something < 1)
  %59 = builtin "lshr_Int64"(%0 : $Builtin.Int64, %4 : $Builtin.Int64) : $Builtin.Int64

  %60 = builtin "cmp_sge_Int64"(%1 : $Builtin.Int64, %59 : $Builtin.Int64) : $Builtin.Int1
  %61 = builtin "cmp_uge_Int64"(%1 : $Builtin.Int64, %59 : $Builtin.Int64) : $Builtin.Int1
  %62 = builtin "cmp_sle_Int64"(%59 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %63 = builtin "cmp_ule_Int64"(%59 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  %70 = builtin "cmp_slt_Int64"(%1 : $Builtin.Int64, %59 : $Builtin.Int64) : $Builtin.Int1
  %71 = builtin "cmp_ult_Int64"(%1 : $Builtin.Int64, %59 : $Builtin.Int64) : $Builtin.Int1
  %72 = builtin "cmp_sgt_Int64"(%59 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %73 = builtin "cmp_ugt_Int64"(%59 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  // x >> -2 (i.e. x shifted by something < 1)
  %79 = builtin "lshr_Int64"(%0 : $Builtin.Int64, %5 : $Builtin.Int64) : $Builtin.Int64

  %80 = builtin "cmp_sge_Int64"(%1 : $Builtin.Int64, %79 : $Builtin.Int64) : $Builtin.Int1
  %81 = builtin "cmp_uge_Int64"(%1 : $Builtin.Int64, %79 : $Builtin.Int64) : $Builtin.Int1
  %82 = builtin "cmp_sle_Int64"(%79 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %83 = builtin "cmp_ule_Int64"(%79 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  %90 = builtin "cmp_slt_Int64"(%1 : $Builtin.Int64, %79 : $Builtin.Int64) : $Builtin.Int1
  %91 = builtin "cmp_ult_Int64"(%1 : $Builtin.Int64, %79 : $Builtin.Int64) : $Builtin.Int1
  %92 = builtin "cmp_sgt_Int64"(%79 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
  %93 = builtin "cmp_ugt_Int64"(%79 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1

  return %4 : $Builtin.Int64

// CHECK-LABEL: sil @fold_cmp_lshr_with_IntMax
// CHECK: bb0
// CHECK-NEXT: integer_literal $Builtin.Int64, 9223372036854775807 
// CHECK-NEXT: integer_literal $Builtin.Int64, 0
// CHECK-NEXT: integer_literal $Builtin.Int64, -2
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: builtin "lshr_Int64"(%0 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: builtin "cmp_uge_Int64"(%1 : $Builtin.Int64, %20 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: builtin "cmp_ule_Int64"(%20 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: builtin "cmp_ult_Int64"(%1 : $Builtin.Int64, %20 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: builtin "cmp_ugt_Int64"(%20 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: builtin "lshr_Int64"(%0 : $Builtin.Int64, %3 : $Builtin.Int64) : $Builtin.Int64
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: builtin "cmp_uge_Int64"(%1 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: integer_literal $Builtin.Int1, -1
// CHECK-NEXT: builtin "cmp_ule_Int64"(%29 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: builtin "cmp_ult_Int64"(%1 : $Builtin.Int64, %29 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: integer_literal $Builtin.Int1, 0
// CHECK-NEXT: builtin "cmp_ugt_Int64"(%29 : $Builtin.Int64, %1 : $Builtin.Int64) : $Builtin.Int1
// CHECK-NEXT: return %2 : $Builtin.Int64
}

// fold_shifts
sil @fold_shifts : $@convention(thin) () -> Builtin.Int64 {
bb0:
  %0 = integer_literal $Builtin.Int64, -32        // users: %9, %8
  %1 = integer_literal $Builtin.Int64, 32         // users: %11, %10
  %2 = integer_literal $Builtin.Int64, 3          // users: %11, %10, %9, %8
  %3 = integer_literal $Builtin.Int64, 1          // user: %12
  %4 = integer_literal $Builtin.Int64, 5          // user: %12
  %8 = builtin "ashr_Int64"(%0 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64
  %9 = builtin "lshr_Int64"(%0 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64
  %10 = builtin "ashr_Int64"(%1 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64
  %11 = builtin "lshr_Int64"(%1 : $Builtin.Int64, %2 : $Builtin.Int64) : $Builtin.Int64
  %12 = builtin "shl_Int64"(%3 : $Builtin.Int64, %4 : $Builtin.Int64) : $Builtin.Int64 // user: %13
  return %12 : $Builtin.Int64                     // id: %13

// CHECK-LABEL: sil @fold_shifts
// CHECK: bb0:
// CHECK-NEXT: %0 = integer_literal $Builtin.Int64, -4
// CHECK-NEXT: %1 = integer_literal $Builtin.Int64, 2305843009213693948
// CHECK-NEXT: %2 = integer_literal $Builtin.Int64, 4
// CHECK-NEXT: %3 = integer_literal $Builtin.Int64, 4
// CHECK-NEXT: %4 = integer_literal $Builtin.Int64, 32
// CHECK-NEXT: return %4 : $Builtin.Int64
}

// Fold x < 0 into false, if x is known to be a result of an unsigned
// operation with overflow checks enabled.
// At the same time x >= 0 is always true under the same conditions.
sil @fold_unsigned_op_with_overflow_lt_zero : $@convention(thin) (Builtin.Int64, Builtin.Int64) -> Builtin.Int64 {
bb0(%0 : $Builtin.Int64, %1 : $Builtin.Int64):
 %zero  = integer_literal $Builtin.Int64, 0
 %2 = integer_literal $Builtin.Int1, -1

 %uadd_result = builtin "uadd_with_overflow_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64, %2: $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
 %uadd_with_overflow_result = tuple_extract %uadd_result : $(Builtin.Int64, Builtin.Int1), 0
 %uadd_overflow = tuple_extract %uadd_result : $(Builtin.Int64, Builtin.Int1), 1
 cond_fail %uadd_overflow : $Builtin.Int1
 %compare_slt_uadd_result = builtin "cmp_slt_Int64"(%uadd_with_overflow_result : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1
 %compare_sge_uadd_result = builtin "cmp_sge_Int64"(%uadd_with_overflow_result : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1


 %usub_result = builtin "usub_with_overflow_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64, %2: $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
 %usub_with_overflow_result = tuple_extract %usub_result : $(Builtin.Int64, Builtin.Int1), 0
 %usub_overflow = tuple_extract %usub_result : $(Builtin.Int64, Builtin.Int1), 1
 cond_fail %uadd_overflow : $Builtin.Int1
 %compare_slt_usub_result = builtin "cmp_slt_Int64"(%usub_with_overflow_result : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1
 %compare_sge_usub_result = builtin "cmp_sge_Int64"(%usub_with_overflow_result : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1


 %umul_result = builtin "umul_with_overflow_Int64"(%0 : $Builtin.Int64, %1 : $Builtin.Int64, %2: $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1)
 %umul_with_overflow_result = tuple_extract %umul_result : $(Builtin.Int64, Builtin.Int1), 0
 %umul_overflow = tuple_extract %umul_result : $(Builtin.Int64, Builtin.Int1), 1
 cond_fail %umul_overflow : $Builtin.Int1
 %compare_slt_umul_result = builtin "cmp_slt_Int64"(%umul_with_overflow_result : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1
 %compare_sge_umul_result = builtin "cmp_sge_Int64"(%umul_with_overflow_result : $Builtin.Int64, %zero : $Builtin.Int64) : $Builtin.Int1

 return %uadd_with_overflow_result : $Builtin.Int64

// CHECK-LABEL: sil @fold_unsigned_op_with_overflow_lt_zero
// CHECK: builtin "uadd_with_overflow_Int64"
// CHECK: integer_literal $Builtin.Int1, 0 
// CHECK: integer_literal $Builtin.Int1, -1 
// CHECK: builtin "usub_with_overflow_Int64"
// CHECK: integer_literal $Builtin.Int1, 0 
// CHECK: integer_literal $Builtin.Int1, -1 
// CHECK: builtin "umul_with_overflow_Int64"
// CHECK: integer_literal $Builtin.Int1, 0 
// CHECK: integer_literal $Builtin.Int1, -1 
// CHECK-NEXT: return {{.*}}$Builtin.Int64
}


// fold_float_operations
sil @fold_float_operations : $@convention(thin) () -> Builtin.FPIEEE64 {
bb0:
  %4 = float_literal $Builtin.FPIEEE64, 0x402E4CCCCCCCCCCD // 15.15
  %11 = float_literal $Builtin.FPIEEE64, 0x400A666666666666 // 3.2999999999999998 // user: %12
  %8 = builtin "fadd_FPIEEE64"(%4 : $Builtin.FPIEEE64, %11 : $Builtin.FPIEEE64) : $Builtin.FPIEEE64
  %9 = builtin "fdiv_FPIEEE64"(%4 : $Builtin.FPIEEE64, %11 : $Builtin.FPIEEE64) : $Builtin.FPIEEE64
  %10 = builtin "fsub_FPIEEE64"(%4 : $Builtin.FPIEEE64, %11 : $Builtin.FPIEEE64) : $Builtin.FPIEEE64
  %13 = builtin "fmul_FPIEEE64"(%4 : $Builtin.FPIEEE64, %11 : $Builtin.FPIEEE64) : $Builtin.FPIEEE64
  return %13 : $Builtin.FPIEEE64

// CHECK-LABEL: sil @fold_float_operations
// CHECK: bb0:
// CHECK-NEXT: %0 = float_literal $Builtin.FPIEEE64, 0x4032733333333333
// CHECK-NEXT: %1 = float_literal $Builtin.FPIEEE64, 0x40125D1745D1745D
// CHECK-NEXT: %2 = float_literal $Builtin.FPIEEE64, 0x4027B33333333334
// CHECK-NEXT: %3 = float_literal $Builtin.FPIEEE64, 0x4048FF5C28F5C28F
// CHECK-NEXT: return %3 : $Builtin.FPIEEE64
}

// rdar://15729207 - Verify that constant folding doesn't leave around obviously
// dead cond_fail instructions.
sil @fold_condfail_instructions : $@convention(thin) () -> Int64 {
bb0:
  %0 = integer_literal $Builtin.IntLiteral, 1        // user: %2
  %2 = builtin "s_to_s_checked_trunc_IntLiteral_Int64"(%0 : $Builtin.IntLiteral) : $(Builtin.Int64, Builtin.Int1) // user: %3
  %3 = tuple_extract %2 : $(Builtin.Int64, Builtin.Int1), 0 // user: %4
  %4 = struct $Int64 (%3 : $Builtin.Int64)        // users: %14, %5
  %6 = integer_literal $Builtin.IntLiteral, 2        // user: %8
  %8 = builtin "s_to_s_checked_trunc_IntLiteral_Int64"(%6 : $Builtin.IntLiteral) : $(Builtin.Int64, Builtin.Int1) // user: %9
  %9 = tuple_extract %8 : $(Builtin.Int64, Builtin.Int1), 0 // user: %10
  %10 = struct $Int64 (%9 : $Builtin.Int64)       // users: %15, %11
  %12 = integer_literal $Builtin.Int1, -1         // user: %16
  %14 = struct_extract %4 : $Int64, #Int64.value  // user: %16
  %15 = struct_extract %10 : $Int64, #Int64.value // user: %16
  %16 = builtin "sadd_with_overflow_Int64"(%14 : $Builtin.Int64, %15 : $Builtin.Int64, %12 : $Builtin.Int1) : $(Builtin.Int64, Builtin.Int1) // users: %18, %17
  %17 = tuple_extract %16 : $(Builtin.Int64, Builtin.Int1), 0 // user: %19
  %18 = tuple_extract %16 : $(Builtin.Int64, Builtin.Int1), 1 // user: %20
  %19 = struct $Int64 (%17 : $Builtin.Int64)      // user: %21
  cond_fail %18 : $Builtin.Int1                   // id: %20
  return %19 : $Int64                             // id: %21


// CHECK-LABEL: sil @fold_condfail_instructions
// CHECK: bb0
// CHECK-NEXT: integer_literal{{.*}}3
// CHECK-NEXT: struct
// CHECK-NEXT: return
}

// Make sure that we properly handle functions eliminated by CCP by removing
// from the worklist. If we don't the following (reduced) test case will blow
// up.

// CHECK-LABEL: sil @properly_handle_eliminated_instructions_in_worklist : $@convention(method) (Bool, @inout UInt) -> () {
sil @properly_handle_eliminated_instructions_in_worklist : $@convention(method) (Bool, @inout UInt) -> () {
bb0(%0 : $Bool, %1 : $*UInt):
  %2 = load %1 : $*UInt
  %3 = integer_literal $Builtin.IntLiteral, 1
  %5 = builtin "s_to_u_checked_trunc_IntLiteral_Word"(%3 : $Builtin.IntLiteral) : $(Builtin.Word, Builtin.Int1)
  %6 = tuple_extract %5 : $(Builtin.Word, Builtin.Int1), 0
  %7 = tuple_extract %5 : $(Builtin.Word, Builtin.Int1), 1
  %8 = struct $UInt (%6 : $Builtin.Word)
  %9 = integer_literal $Builtin.IntLiteral, 0
  %11 = builtin "s_to_u_checked_trunc_IntLiteral_Word"(%9 : $Builtin.IntLiteral) : $(Builtin.Word, Builtin.Int1)
  %12 = tuple_extract %11 : $(Builtin.Word, Builtin.Int1), 0
  %13 = tuple_extract %11 : $(Builtin.Word, Builtin.Int1), 1
  %14 = struct $UInt (%12 : $Builtin.Word)
  %15 = integer_literal $Builtin.IntLiteral, 1
  %17 = builtin "s_to_u_checked_trunc_IntLiteral_Word"(%15 : $Builtin.IntLiteral) : $(Builtin.Word, Builtin.Int1)
  %18 = tuple_extract %17 : $(Builtin.Word, Builtin.Int1), 0
  %19 = tuple_extract %17 : $(Builtin.Word, Builtin.Int1), 1
  %20 = struct $UInt (%18 : $Builtin.Word)
  %22 = struct_extract %14 : $UInt, #UInt.value
  %23 = struct_extract %20 : $UInt, #UInt.value
  %25 = integer_literal $Builtin.IntLiteral, 0
  %27 = builtin "s_to_s_checked_trunc_IntLiteral_Word"(%25 : $Builtin.IntLiteral) : $(Builtin.Word, Builtin.Int1)
  %28 = tuple_extract %27 : $(Builtin.Word, Builtin.Int1), 0
  %29 = tuple_extract %27 : $(Builtin.Word, Builtin.Int1), 1
  %30 = struct $Int (%28 : $Builtin.Word)
  %31 = struct_extract %30 : $Int, #Int.value
  %32 = builtin "trunc_Word_Int1"(%31 : $Builtin.Word) : $Builtin.Int1
  %33 = struct $Bool (%32 : $Builtin.Int1)
  %34 = struct_extract %33 : $Bool, #Bool.value
  %35 = builtin "usub_with_overflow_Word"(%22 : $Builtin.Word, %23 : $Builtin.Word, %34 : $Builtin.Int1) : $(Builtin.Word, Builtin.Int1)
  %36 = tuple_extract %35 : $(Builtin.Word, Builtin.Int1), 0
  %37 = tuple_extract %35 : $(Builtin.Word, Builtin.Int1), 1
  %38 = struct $UInt (%36 : $Builtin.Word)
  %39 = struct $Bool (%37 : $Builtin.Int1)
  %40 = tuple (%38 : $UInt, %39 : $Bool)
  %41 = tuple_extract %40 : $(UInt, Bool), 0
  %42 = tuple_extract %40 : $(UInt, Bool), 1
  %44 = struct_extract %8 : $UInt, #UInt.value
  %45 = struct_extract %41 : $UInt, #UInt.value
  %46 = builtin "xor_Word"(%44 : $Builtin.Word, %45 : $Builtin.Word) : $Builtin.Word
  %47 = struct $UInt (%46 : $Builtin.Word)
  %49 = struct_extract %2 : $UInt, #UInt.value
  %50 = struct_extract %47 : $UInt, #UInt.value
  %51 = builtin "and_Word"(%49 : $Builtin.Word, %50 : $Builtin.Word) : $Builtin.Word
  %52 = struct $UInt (%51 : $Builtin.Word)
  %53 = tuple ()
  return %53 : $()
}

// CHECK-LABEL: sil @constant_expect_hint
// CHECK: bb0:
// CHECK-NEXT: [[INT1:%[0-9]+]] = integer_literal $Builtin.Int1, 0
// CHECK-NEXT: [[INT2:%[0-9]+]] = integer_literal $Builtin.Int32, 5
// CHECK-NEXT: [[INT3:%[0-9]+]] = integer_literal $Builtin.Int64, 32
// CHECK-NEXT: [[TUPLE:%[0-9]+]] = tuple ([[INT1]] : $Builtin.Int1, [[INT2]] : $Builtin.Int32, [[INT3]] : $Builtin.Int64)
// CHECK-NEXT: return [[TUPLE]]
// CHECK-NEXT: }
sil @constant_expect_hint : $@convention(thin) () -> (Builtin.Int1, Builtin.Int32, Builtin.Int64) {
bb0:
  %0 = integer_literal $Builtin.Int1, 0
  %1 = integer_literal $Builtin.Int32, 5
  %2 = integer_literal $Builtin.Int64, 32

  %3 = integer_literal $Builtin.Int1, 1
  %4 = integer_literal $Builtin.Int32, 400
  %5 = integer_literal $Builtin.Int64, 5000

  %9 = builtin "int_expect_Int1"(%0 : $Builtin.Int1, %3 : $Builtin.Int1) : $Builtin.Int1
  %10 = builtin "int_expect_Int32"(%1 : $Builtin.Int32, %4 : $Builtin.Int32) : $Builtin.Int32
  %11 = builtin "int_expect_Int64"(%2 : $Builtin.Int64, %5 : $Builtin.Int64) : $Builtin.Int64

  %12 = tuple (%9 : $Builtin.Int1, %10 : $Builtin.Int32, %11 : $Builtin.Int64)
  return %12 : $(Builtin.Int1, Builtin.Int32, Builtin.Int64)
}

// CHECK-LABEL: sil @constant_fold_indexing_inst_of_0 : $@convention(thin) (Builtin.RawPointer) -> (Builtin.Int8, Builtin.Int8) {
// CHECK: bb0
// CHECK-NEXT: pointer_to_address
// CHECK-NEXT: pointer_to_address
// CHECK-NEXT: load
// CHECK-NEXT: load
// CHECK-NEXT: tuple
// CHECK-NEXT: return
sil @constant_fold_indexing_inst_of_0 : $@convention(thin) (Builtin.RawPointer) -> (Builtin.Int8, Builtin.Int8) {
bb0(%0 : $Builtin.RawPointer):
  %1 = integer_literal $Builtin.Word, 0
  %2 = pointer_to_address %0 : $Builtin.RawPointer to [strict] $*Builtin.Int8
  %3 = index_addr %2 : $*Builtin.Int8, %1 : $Builtin.Word
  %4 = index_raw_pointer %0 : $Builtin.RawPointer, %1 : $Builtin.Word
  %5 = pointer_to_address %4 : $Builtin.RawPointer to [strict] $*Builtin.Int8
  %6 = load %3 : $*Builtin.Int8
  %7 = load %5 : $*Builtin.Int8
  %8 = tuple(%6 : $Builtin.Int8, %7 : $Builtin.Int8)
  return %8 : $(Builtin.Int8, Builtin.Int8)
}

// CHECK-LABEL: sil @constant_assume_non_negative
// CHECK: bb0:
// CHECK-NEXT: [[I:%[0-9]+]] = integer_literal $Builtin.Word, 27
// CHECK-NEXT: return [[I]]
// CHECK-NEXT: }
sil @constant_assume_non_negative : $@convention(thin) () -> Builtin.Word {
  %0 = integer_literal $Builtin.Word, 27
  %1 = builtin "assumeNonNegative_Word"(%0 : $Builtin.Word) : $Builtin.Word
  return %0 : $Builtin.Word
}

// CHECK-LABEL: sil @constant_fold_fptrunc
// CHECK: bb0:
// CHECK-NEXT: %0 = float_literal
// CHECK-NEXT: %1 = tuple ()
// CHECK-NEXT: return
// CHECK-NEXT: }
sil @constant_fold_fptrunc : $@convention(thin) () -> () {
bb0:
  %0 = float_literal $Builtin.FPIEEE80, 0x4000C90E5604189374BC // 3.14149999999999999991 // user: %1
  %1 = builtin "fptrunc_FPIEEE80_FPIEEE64"(%0 : $Builtin.FPIEEE80) : $Builtin.FPIEEE64 // user: %2
  %3 = tuple ()
  return %3 : $()                             // id: %3
}

struct Value {}

class AnObject {}

// CHECK-LABEL: sil @replace_unconditional_check_cast_failure
// CHECK:  bb2:
// CHECK:  alloc_stack $AnObject
// CHECK:  store undef to %0
// CHECK:  dealloc_stack
// CHECK:  builtin "int_trap"()
// CHECK:  unreachable

sil @replace_unconditional_check_cast_failure : $@convention(thin) (Builtin.Int1, @guaranteed AnObject) -> (@out Value) {
bb0(%2 : $*Value, %0 : $Builtin.Int1, %1 : $AnObject):
  cond_br %0, bb1, bb2

bb1:
  %3 = tuple()
  return %3 : $()

bb2:
  %31 = alloc_stack $AnObject
  store %1 to %31 : $*AnObject
  strong_retain %1 : $AnObject
  unconditional_checked_cast_addr AnObject in %31 : $*AnObject to Value in %2 : $*Value
  %32 = alloc_stack $AnObject
  dealloc_stack %32: $*AnObject
  dealloc_stack %31 : $*AnObject
  br bb1
}

public protocol P {
}

public protocol PP {
}

struct X : P {
}

struct Y<T>: P {
  var x : T
}

class Z: P {
  init()
}

// Do not optimize casts to unrelated protocols.
// CHECK-LABEL: sil @dont_replace_unconditional_check_cast_addr_for_type_to_unrelated_existential
// CHECK: unconditional_checked_cast_addr
// CHECK: end sil function 'dont_replace_unconditional_check_cast_addr_for_type_to_unrelated_existential'
sil @dont_replace_unconditional_check_cast_addr_for_type_to_unrelated_existential : $@convention(thin) (@in X) -> (@out PP) {
bb0(%0 : $*PP, %1 : $*X):
  unconditional_checked_cast_addr X in %1 : $*X to PP in %0 : $*PP
  %2 = tuple ()
  return %2 : $()
}

// Do not optimize casts between existentials.
// CHECK-LABEL: sil @dont_replace_unconditional_check_cast_addr_for_existential_to_existential
// CHECK: unconditional_checked_cast_addr
// CHECK: end sil function 'dont_replace_unconditional_check_cast_addr_for_existential_to_existential'
sil @dont_replace_unconditional_check_cast_addr_for_existential_to_existential : $@convention(thin) (@in PP) -> (@out P) {
bb0(%0 : $*P, %1 : $*PP):
  unconditional_checked_cast_addr PP in %1 : $*PP to P in %0 : $*P
  %2 = tuple ()
  return %2 : $()
}

// Check that an unconditional_checked_cast_addr from a non-existential loadable type to a protocol
// can be replaced by a more efficient code sequence if it is statitcally known that this
// type conforms to this protocol.
// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_type_to_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential
// CHECK-NOT: store
// CHECK: copy_addr
// CHECK-NOT: destroy_addr
// CHECK-NOT: unconditional_checked_cast_addr
sil @replace_unconditional_check_cast_addr_for_type_to_existential : $@convention(thin) (@in X) -> (@out P) {
bb0(%0 : $*P, %1 : $*X):
  unconditional_checked_cast_addr X in %1 : $*X to P in %0 : $*P
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_class_to_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential_addr
// CHECK-NOT: unconditional_checked_cast_addr
sil @replace_unconditional_check_cast_addr_for_class_to_existential : $@convention(thin) (@in Z) -> (@out P) {
bb0(%0 : $*P, %1 : $*Z):
  unconditional_checked_cast_addr Z in %1 : $*Z to P in %0 : $*P
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_archetype_to_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential_addr
// CHECK-NOT: unconditional_checked_cast_addr
sil @replace_unconditional_check_cast_addr_for_archetype_to_existential : $@convention(thin) <X:P> (@in X) -> (@out P) {
bb0(%0 : $*P, %1 : $*X):
  unconditional_checked_cast_addr X in %1 : $*X to P in %0 : $*P
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_generic_type_to_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential_addr
// CHECK-NOT: unconditional_checked_cast_addr
sil @replace_unconditional_check_cast_addr_for_generic_type_to_existential : $@convention(thin) <X:P> (@in Y<X>) -> (@out P) {
bb0(%0 : $*P, %1 : $*Y<X>):
  unconditional_checked_cast_addr Y<X> in %1 : $*Y<X> to P in %0 : $*P
  %2 = tuple ()
  return %2 : $()
}

protocol Q : class {
}

class V : Q {
  init()
}

class W<T>: Q {
  var x : T
  init()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_type_to_class_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK-NOT: retain_value
// CHECK: init_existential_ref
// CHECK-NOT: retain_value
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: return
sil @replace_unconditional_check_cast_addr_for_type_to_class_existential : $@convention(thin) (@in V) -> (@out Q) {
bb0(%0 : $*Q, %1 : $*V):
  unconditional_checked_cast_addr V in %1 : $*V to Q in %0 : $*Q
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_archetype_to_class_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK-NOT: retain_value
// CHECK: init_existential_ref
// CHECK-NOT: retain_value
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: return
sil @replace_unconditional_check_cast_addr_for_archetype_to_class_existential : $@convention(thin) <X:Q> (@in X) -> (@out Q) {
bb0(%0 : $*Q, %1 : $*X):
  unconditional_checked_cast_addr X in %1 : $*X to Q in %0 : $*Q
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_to_class_existential
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK-NOT: retain_value
// CHECK: init_existential_ref
// CHECK-NOT: retain_value
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: return
sil @replace_unconditional_check_cast_addr_to_class_existential : $@convention(thin) <X:Q> (@in W<X>) -> (@out Q) {
bb0(%0 : $*Q, %1 : $*W<X>):
  unconditional_checked_cast_addr W<X> in %1 : $*W<X> to Q in %0 : $*Q
  %2 = tuple ()
  return %2 : $()
}

public protocol MyError : Error {
}

public class E1 : MyError {
  init()
}

public class E2<T> : MyError {
  init()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_type_to_myerror_existential 
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential_addr
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: return
sil @replace_unconditional_check_cast_addr_for_type_to_myerror_existential : $@convention(thin) (@in E1) -> (@out MyError) {
bb0(%0 : $*MyError, %1 : $*E1):
  unconditional_checked_cast_addr E1 in %1 : $*E1 to MyError in %0 : $*MyError
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_archetype_to_myerror_existentia
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential_addr
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: return
sil @replace_unconditional_check_cast_addr_for_archetype_to_myerror_existential : $@convention(thin) <X:MyError> (@in X) -> (@out MyError) {
bb0(%0 : $*MyError, %1 : $*X):
  unconditional_checked_cast_addr X in %1 : $*X to MyError in %0 : $*MyError
  %2 = tuple ()
  return %2 : $()
}

// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_to_myerror_existential 
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: init_existential_addr
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: return
sil @replace_unconditional_check_cast_addr_to_myerror_existential : $@convention(thin) <X:MyError> (@in E2<X>) -> (@out MyError) {
bb0(%0 : $*MyError, %1 : $*E2<X>):
  unconditional_checked_cast_addr E2<X> in %1 : $*E2<X> to MyError in %0 : $*MyError
  %2 = tuple ()
  return %2 : $()
}

// Check casts to Error.
// CHECK-LABEL: sil @replace_unconditional_check_cast_addr_for_type_to_error_existential 
// CHECK-NOT: unconditional_checked_cast_addr
// CHECK: [[ALLOC_BOX:%.*]] = alloc_existential_box $Error, $E1
// CHECK: [[PROJ:%.*]] = project_existential_box $E1 in [[ALLOC_BOX]] : $Error
// CHECK: copy_addr [take] %1 to [initialization] [[PROJ]]
// CHECK: store [[ALLOC_BOX]] to %0 : $*Error
// CHECK: return
sil @replace_unconditional_check_cast_addr_for_type_to_error_existential : $@convention(thin) (@in E1) -> (@out Error) {
bb0(%0 : $*Error, %1 : $*E1):
  unconditional_checked_cast_addr E1 in %1 : $*E1 to Error in %0 : $*Error
  %2 = tuple ()
  return %2 : $()
}