; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=reassociate %s -S | FileCheck %s

target triple = "x86_64-unknown-linux-gnu"

define void @f() {
; CHECK-LABEL: @f(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[DONE:%.*]]
; CHECK:       dead:
; CHECK-NEXT:    [[XOR0:%.*]] = xor i16 [[XOR1:%.*]], undef
; CHECK-NEXT:    [[XOR1]] = xor i16 [[XOR0]], undef
; CHECK-NEXT:    br i1 undef, label [[DEAD:%.*]], label [[DONE]]
; CHECK:       done:
; CHECK-NEXT:    ret void
;
entry:
  br label %done

dead:
  %xor0 = xor i16 %xor1, undef
  %xor1 = xor i16 %xor0, undef
  br i1 undef, label %dead, label %done

done:
  %e = phi i16 [ %xor1, %dead ], [ 0, %entry ]
  ret void
}