File: select_enum_addr_reads_memory.sil

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// RUN: %target-sil-opt -enable-sil-verify-all -loop-rotate %s | %FileCheck %s

import Builtin

enum TestEnum {
  case A
  case B
}

// CHECK-LABEL: testit
sil @testit : $@convention(thin) () -> () {
bb0:
  %i0 = integer_literal $Builtin.Int1, 0
  %i1 = integer_literal $Builtin.Int1, -1
  %0 = alloc_stack $TestEnum
  %1 = enum $TestEnum, #TestEnum.A!enumelt
  store %1 to %0 : $*TestEnum
  br bb1

// CHECK: bb1:
bb1:

// Test if this select_enum_addr inst is not moved before the loop but stays in the loop.
// CHECK: apply
// CHECK: [[X:%[0-9]+]] = select_enum_addr
// CHECK: cond_br [[X]]
  %x1 = select_enum_addr %0 : $*TestEnum, case #TestEnum.A!enumelt: %i0, default %i1 : $Builtin.Int1
  cond_br %x1, bb2, bb3

bb2:
  %6 = function_ref @writeEnum: $@convention(thin) (@inout TestEnum) -> ()
  %7 = apply %6(%0) : $@convention(thin) (@inout TestEnum) -> ()
  br bb1

bb3:
  %9 = tuple ()
  dealloc_stack %0 : $*TestEnum
  return %9 : $()
}

sil @writeEnum: $@convention(thin) (@inout TestEnum) -> ()