// RUN: %target-sil-opt -enable-sil-opaque-values -enable-sil-verify-all %s -jumpthread-simplify-cfg | %FileCheck %s

sil_stage canonical

protocol P {}

// Test jump threading into a destination block terminated by checked_cast_value_br.
//
// CHECK-LABEL: sil @testJumpThread : $@convention(thin) (Any, Any) -> () {
// CHECK: bb0(%0 : $Any, %1 : $Any):
// CHECK:   cond_br undef, bb1, bb4
// CHECK: bb1:
// CHECK:   retain_value %0 : $Any
// CHECK:   release_value %0 : $Any
// CHECK:   checked_cast_value_br %0 : $Any to $P, bb3, bb2
// CHECK-LABEL: } // end sil function 'testJumpThread'
sil @testJumpThread : $@convention(thin) (Any, Any) -> () {
bb0(%0 : $Any, %1 : $Any):
  cond_br undef, bb1, bb2
bb1:
  retain_value %0 : $Any // force jump-threading
  br bb6(%0 : $Any)
bb2:
  br bb6(%1 : $Any)
bb6(%any : $Any):
  release_value %any : $Any // force jump-threading
  checked_cast_value_br %any : $Any to $P, bb7, bb8
bb7(%p : $P):
  br bb9
bb8:
  br bb9
bb9:
  %999 = tuple ()
  return %999 : $()
}