test/SILOptimizer/mem2reg_unreachable.sil

// RUN: %target-sil-opt -enable-sil-verify-all %s -mem2reg

// Make sure we are not crashing on blocks that are not dominated by the entry block.

sil_stage canonical

import Builtin
import Swift

sil @_TF4main3fooFT1xSi1ySi_Si : $@convention(thin) (Int32, Int32) -> Int32 {
bb0(%0 : $Int32, %1 : $Int32):
  debug_value %0 : $Int32, let, name "x" // id: %2
  debug_value %1 : $Int32, let, name "y" // id: %3
  %4 = alloc_stack $Int32, var, name "g"               // users: %14, %18, %20, %21
  %6 = struct_extract %1 : $Int32, #Int32._value   // user: %8
  %7 = struct_extract %0 : $Int32, #Int32._value   // user: %8
  %8 = builtin "cmp_sgt_Word"(%6 : $Builtin.Int32, %7 : $Builtin.Int32) : $Builtin.Int1 // user: %9
  %9 = struct $Bool (%8 : $Builtin.Int1)          // user: %10
  %10 = struct_extract %9 : $Bool, #Bool._value    // user: %11
  br bb2                                          // id: %11

bb1:                                              // Preds: bb0
  %12 = integer_literal $Builtin.Int32, 5         // user: %13
  %13 = struct $Int32 (%12 : $Builtin.Int32)      // user: %14
  store %13 to %4 : $*Int32                     // id: %14
  br bb3                                          // id: %15

bb2:                                              // Preds: bb0
  %16 = integer_literal $Builtin.Int32, 4         // user: %17
  %17 = struct $Int32 (%16 : $Builtin.Int32)      // user: %18
  store %17 to %4 : $*Int32                     // id: %18
  br bb3                                          // id: %19

bb3:                                              // Preds: bb1 bb2
  %20 = load %4 : $*Int32                       // user: %22
  dealloc_stack %4 : $*Int32     // id: %21
  return %20 : $Int32                             // id: %22
}

struct S {}

sil hidden @handle_unreachable : $@convention(thin) () -> () {
bb0:
  %0 = alloc_stack $S, var, name "x"
  %1 = struct $S ()
  store %1 to %0 : $*S
  unreachable

bb1:
  debug_value_addr %0 : $*S, let, name "newvalue", argno 1
  br bb2

bb2:
  %3 = load %0 : $*S
  dealloc_stack %0 : $*S
  %4 = tuple ()
  return %4 : $()
}