; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
; RUN: opt -passes=gvn -S < %s | FileCheck %s

@a = external local_unnamed_addr global i32, align 4
@b = external local_unnamed_addr global i32, align 4

; Function Attrs: nounwind readnone
declare ptr @j() local_unnamed_addr #0

define i64 @k() local_unnamed_addr {
; CHECK-LABEL: define i64 @k() local_unnamed_addr {
; CHECK-NEXT:  [[BB:.*:]]
; CHECK-NEXT:    br i1 undef, label %[[BB10_PREHEADER:.*]], label %[[BB3:.*]]
; CHECK:       [[BB10_PREHEADER]]:
; CHECK-NEXT:    br label %[[BB13:.*]]
; CHECK:       [[BB3]]:
; CHECK-NEXT:    [[I4:%.*]] = load i32, ptr @a, align 4
; CHECK-NEXT:    [[I5_NOT:%.*]] = icmp eq i32 [[I4]], 0
; CHECK-NEXT:    [[I8:%.*]] = tail call ptr @j()
; CHECK-NEXT:    br label %[[BB37:.*]]
; CHECK:       [[BB13]]:
; CHECK-NEXT:    br i1 undef, label %[[BB30THREAD_PRE_SPLIT:.*]], label %[[BB16:.*]]
; CHECK:       [[BB16]]:
; CHECK-NEXT:    [[I17:%.*]] = tail call ptr @j()
; CHECK-NEXT:    br i1 undef, label %[[BB22THREAD_PRE_SPLIT:.*]], label %[[BB37_LOOPEXIT:.*]]
; CHECK:       [[BB22THREAD_PRE_SPLIT]]:
; CHECK-NEXT:    br i1 undef, label %[[BB30THREAD_PRE_SPLIT]], label %[[BB37_LOOPEXIT]]
; CHECK:       [[BB30THREAD_PRE_SPLIT]]:
; CHECK-NEXT:    [[I31_PR:%.*]] = load i32, ptr @a, align 4
; CHECK-NEXT:    [[I32_NOT2:%.*]] = icmp eq i32 [[I31_PR]], 0
; CHECK-NEXT:    br i1 undef, label %[[BB37_LOOPEXIT]], label %[[BB13]]
; CHECK:       [[BB37_LOOPEXIT]]:
; CHECK-NEXT:    [[I38_PRE:%.*]] = load i32, ptr @a, align 4
; CHECK-NEXT:    br label %[[BB37]]
; CHECK:       [[BB37]]:
; CHECK-NEXT:    [[I38:%.*]] = phi i32 [ [[I38_PRE]], %[[BB37_LOOPEXIT]] ], [ [[I4]], %[[BB3]] ]
; CHECK-NEXT:    store i32 [[I38]], ptr @b, align 4
; CHECK-NEXT:    [[I39:%.*]] = tail call ptr @j()
; CHECK-NEXT:    unreachable
;
bb:
  br i1 undef, label %bb10.preheader, label %bb3

bb10.preheader:                                   ; preds = %bb
  br label %bb13

bb3:                                              ; preds = %bb
  %i4 = load i32, ptr @a, align 4
  %i5.not = icmp eq i32 %i4, 0
  br label %bb7

bb7:                                              ; preds = %bb3
  %i8 = tail call ptr @j()
  br label %bb37

bb13:                                             ; preds = %bb34, %bb10.preheader
  br i1 undef, label %bb30thread-pre-split, label %bb16

bb16:                                             ; preds = %bb13
  %i17 = tail call ptr @j()
  br i1 undef, label %bb22thread-pre-split, label %bb37.loopexit

bb22thread-pre-split:                             ; preds = %bb16
  br label %bb27

bb27:                                             ; preds = %bb22thread-pre-split
  br i1 undef, label %bb30thread-pre-split, label %bb37.loopexit

bb30thread-pre-split:                             ; preds = %bb27, %bb13
  %i31.pr = load i32, ptr @a, align 4
  %i32.not2 = icmp eq i32 %i31.pr, 0
  br label %bb34

bb34:                                             ; preds = %bb30thread-pre-split
  br i1 undef, label %bb37.loopexit, label %bb13

bb37.loopexit:                                    ; preds = %bb34, %bb27, %bb16
  br label %bb37

bb37:                                             ; preds = %bb37.loopexit, %bb7
  %i38 = load i32, ptr @a, align 4
  store i32 %i38, ptr @b, align 4
  %i39 = tail call ptr @j()
  unreachable
}

attributes #0 = { nounwind readnone }