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

// REQUIRES: asserts

// This file is meant to pass the verifier.

import Builtin

sil_stage canonical

// Don't fail in the verifier on a shared unreachable exit block of two loops.
sil @dont_fail: $@convention(thin) (Builtin.Int1) -> () {
bb0(%0 : $Builtin.Int1):
  %2 = integer_literal $Builtin.Int1, -1
  cond_br %0, bb1, bb5

// Loop.
bb1:
  %4 = alloc_stack $Builtin.Int32
  cond_br %0, bb2, bb3

bb2:
  dealloc_stack %4 : $*Builtin.Int32
  cond_br %0, bb4, bb1

// Cloned loop.
bb5:
  %6 = alloc_stack $Builtin.Int32
  cond_br %0, bb6, bb3

bb6:
  dealloc_stack %6 : $*Builtin.Int32
  cond_br %0, bb4, bb5

// Shared unreachable exit block.
bb3:
  cond_fail %2 : $Builtin.Int1
  unreachable

bb4:
  %10 = tuple ()
  return %10 : $()
}


sil @dont_fail2: $@convention(thin) (Builtin.Int1) -> () {
bb0(%0 : $Builtin.Int1):
  %2 = integer_literal $Builtin.Int1, -1
  cond_br %0, bb1, bb5

// Loop.
bb1:
  %4 = alloc_stack $Builtin.Int32
  cond_br %0, bb2, bb3

bb2:
  dealloc_stack %4 : $*Builtin.Int32
  cond_br %0, bb4, bb1

// Cloned loop.
bb5:
  %6 = alloc_stack $Builtin.Int32
  cond_br %0, bb6, bb3

bb6:
  dealloc_stack %6 : $*Builtin.Int32
  cond_br %0, bb4, bb5

// Shared unreachable exit block.
bb3:
 cond_br %0, bb7, bb8

bb7:
  cond_fail %2 : $Builtin.Int1
  unreachable

bb8:
  cond_fail %2 : $Builtin.Int1
  unreachable

bb4:
  %10 = tuple ()
  return %10 : $()
}

// Verify that findAccessedStorage handles cyclic phis.
// <rdar://47059671> swiftc crashes
class AClass {
  var aStoredProp: Builtin.Int32
}

sil @testPhiCycle : $@convention(thin) (@guaranteed AClass) -> () {
bb0(%0 : $AClass):
  %accessAddr = ref_element_addr %0 : $AClass, #AClass.aStoredProp
  br bbloop(%accessAddr : $*Builtin.Int32)

bbloop(%phiAddr : $*Builtin.Int32):
  %access = begin_access [read] [dynamic] [no_nested_conflict] %phiAddr : $*Builtin.Int32
  %val = load %access : $*Builtin.Int32
  end_access %access : $*Builtin.Int32
  cond_br undef, bbtail, bbreturn

bbtail:
  br bbloop(%phiAddr : $*Builtin.Int32)

bbreturn:
  %v = tuple ()
  return %v : $()
}