test/SILOptimizer/alias-crash.sil

// RUN: %target-sil-opt -enable-sil-verify-all %s -redundant-load-elim | %FileCheck %s

sil_stage canonical

import Builtin

struct MyStruct {
  var value: Builtin.FPIEEE64
}

enum MyEnum {
  case some(MyStruct)
  case none
}

// Check if alias analysis can handle unchecked_take_enum_data_addr correctly
// and does not crash with a stack overflow.

// CHECK-LABEL: sil @testit
// CHECK: load
// CHECK: load
// CHECK: return
sil @testit : $@convention(method) (MyEnum) -> Builtin.FPIEEE64 {
bb0(%0 : $MyEnum):
  %x1 = alloc_stack $MyEnum
  store %0 to %x1 : $*MyEnum
  %x7 = unchecked_take_enum_data_addr %x1 : $*MyEnum, #MyEnum.some!enumelt.1
  %x8 = struct_element_addr %x7 : $*MyStruct, #MyStruct.value
  %x11 = alloc_stack $MyEnum
  store %0 to %x11 : $*MyEnum
  %x19 = unchecked_take_enum_data_addr %x11 : $*MyEnum, #MyEnum.some!enumelt.1
  %x20 = struct_element_addr %x19 : $*MyStruct, #MyStruct.value
  %x24 = load %x20 : $*Builtin.FPIEEE64
  %x27 = load %x8 : $*Builtin.FPIEEE64
  %x28 = builtin "fsub_FPIEEE64"(%x27 : $Builtin.FPIEEE64, %x24 : $Builtin.FPIEEE64) : $Builtin.FPIEEE64
  dealloc_stack %x11 : $*MyEnum
  dealloc_stack %x1 : $*MyEnum
  return %x28 : $Builtin.FPIEEE64
}