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

declare void @foo()

define void @bar(i32 %0) {
; CHECK-LABEL: define void @bar(
; CHECK-SAME: i32 [[TMP0:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br label %[[BB_1:.*]]
; CHECK:       [[BB_1]]:
; CHECK-NEXT:    [[V_0:%.*]] = icmp slt i32 [[TMP0]], 35
; CHECK-NEXT:    br i1 [[V_0]], label %[[BB_3:.*]], label %[[BB_2:.*]]
; CHECK:       [[BB_2]]:
; CHECK-NEXT:    [[V_1:%.*]] = icmp slt i32 [[TMP0]], 47
; CHECK-NEXT:    br label %[[IRR_GUARD:.*]]
; CHECK:       [[BB_3]]:
; CHECK-NEXT:    [[V_2:%.*]] = icmp eq i32 [[TMP0]], 0
; CHECK-NEXT:    br label %[[IRR_GUARD]]
; CHECK:       [[BB_4:.*]]:
; CHECK-NEXT:    br label %[[IRR_GUARD]]
; CHECK:       [[BB_5:.*]]:
; CHECK-NEXT:    [[V_4:%.*]] = icmp eq i32 [[V_3_MOVED:%.*]], 0
; CHECK-NEXT:    br i1 true, label %[[BB_6:.*]], label %[[BB_7:.*]]
; CHECK:       [[BB_6]]:
; CHECK-NEXT:    [[V_5:%.*]] = phi i32 [ [[V_3_MOVED]], %[[BB_5]] ], [ [[V_5_MOVED:%.*]], %[[IRR_GUARD1:.*]] ]
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label %[[BB_4]]
; CHECK:       [[BB_7]]:
; CHECK-NEXT:    ret void
; CHECK:       [[IRR_GUARD]]:
; CHECK-NEXT:    [[V_5_MOVED]] = phi i32 [ poison, %[[BB_4]] ], [ poison, %[[BB_2]] ], [ 0, %[[BB_3]] ]
; CHECK-NEXT:    [[V_3_MOVED]] = phi i32 [ 0, %[[BB_4]] ], [ 1, %[[BB_2]] ], [ poison, %[[BB_3]] ]
; CHECK-NEXT:    [[GUARD_BB_5:%.*]] = phi i1 [ true, %[[BB_4]] ], [ true, %[[BB_2]] ], [ false, %[[BB_3]] ]
; CHECK-NEXT:    [[GUARD_BB_6:%.*]] = phi i1 [ false, %[[BB_4]] ], [ false, %[[BB_2]] ], [ [[V_2]], %[[BB_3]] ]
; CHECK-NEXT:    br i1 [[GUARD_BB_5]], label %[[BB_5]], label %[[IRR_GUARD1]]
; CHECK:       [[IRR_GUARD1]]:
; CHECK-NEXT:    br i1 [[GUARD_BB_6]], label %[[BB_6]], label %[[BB_4]]
;
entry:
  br label %bb.1

bb.1:
  %v.0 = icmp slt i32 %0, 35
  br i1 %v.0, label %bb.3, label %bb.2

bb.2:
  %v.1 = icmp slt i32 %0, 47
  br i1 %v.1, label %bb.5, label %bb.5

bb.3:
  %v.2 = icmp eq i32 %0, 0
  br i1 %v.2, label %bb.6, label %bb.4

bb.4:
  br label %bb.5

bb.5:
  %v.3 = phi i32 [ 0, %bb.4 ], [ 1, %bb.2 ], [ 1, %bb.2 ]
  %v.4 = icmp eq i32 %v.3, 0
  br i1 true, label %bb.6, label %bb.7

bb.6:
  %v.5 = phi i32 [ %v.3, %bb.5 ], [ 0, %bb.3 ]
  call void @foo()
  br label %bb.4

bb.7:
  ret void
}

define void @baz(i1 %v.0, i1 %v.1) {
; CHECK-LABEL: define void @baz(
; CHECK-SAME: i1 [[V_0:%.*]], i1 [[V_1:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*:]]
; CHECK-NEXT:    br i1 [[V_0]], label %[[BB_1:.*]], label %[[BB_2:.*]]
; CHECK:       [[BB_1]]:
; CHECK-NEXT:    br label %[[IRR_GUARD:.*]]
; CHECK:       [[BB_2]]:
; CHECK-NEXT:    br label %[[IRR_GUARD]]
; CHECK:       [[BB_3:.*]]:
; CHECK-NEXT:    br label %[[BB_4:.*]]
; CHECK:       [[BB_4]]:
; CHECK-NEXT:    br label %[[IRR_GUARD]]
; CHECK:       [[IRR_GUARD]]:
; CHECK-NEXT:    [[GUARD_BB_3:%.*]] = phi i1 [ true, %[[BB_4]] ], [ true, %[[BB_2]] ], [ false, %[[BB_1]] ]
; CHECK-NEXT:    br i1 [[GUARD_BB_3]], label %[[BB_3]], label %[[BB_4]]
;
entry:
  br i1 %v.0, label %bb.1, label %bb.2

bb.1:
  br label %bb.4

bb.2:
  br i1 %v.1, label %bb.3, label %bb.3

bb.3:
  br label %bb.4

bb.4:
  br label %bb.3

  ; required to trigger the issue.
  uselistorder label %bb.4, { 1, 0 }
}