test/Transforms/GVN/br-identical.ll

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

; If a branch has two identical successors, we cannot declare either dead.
define void @widget(i1 %p) {
; CHECK-LABEL: define void @widget(
; CHECK-SAME: i1 [[P:%.*]]) {
; CHECK-NEXT:  [[ENTRY:.*]]:
; CHECK-NEXT:    br label %[[BB2:.*]]
; CHECK:       [[BB2]]:
; CHECK-NEXT:    [[T1:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[T2:%.*]], %[[BB7:.*]] ]
; CHECK-NEXT:    [[T2]] = add i64 [[T1]], 1
; CHECK-NEXT:    [[T3:%.*]] = icmp ult i64 0, [[T2]]
; CHECK-NEXT:    br i1 [[T3]], label %[[BB3:.*]], label %[[BB4:.*]]
; CHECK:       [[BB3]]:
; CHECK-NEXT:    [[T4:%.*]] = call i64 @f()
; CHECK-NEXT:    br label %[[BB4]]
; CHECK:       [[BB4]]:
; CHECK-NEXT:    [[FOO:%.*]] = phi i64 [ [[T4]], %[[BB3]] ], [ 0, %[[BB2]] ]
; CHECK-NEXT:    br i1 [[P]], label %[[BB5:.*]], label %[[BB6:.*]]
; CHECK:       [[BB5]]:
; CHECK-NEXT:    br i1 true, label %[[BB7]], label %[[BB7]]
; CHECK:       [[BB6]]:
; CHECK-NEXT:    br i1 true, label %[[BB7]], label %[[BB7]]
; CHECK:       [[BB7]]:
; CHECK-NEXT:    br i1 [[P]], label %[[BB2]], label %[[BB8:.*]]
; CHECK:       [[BB8]]:
; CHECK-NEXT:    ret void
;
entry:
  br label %bb2

bb2:
  %t1 = phi i64 [ 0, %entry ], [ %t5, %bb7 ]
  %t2 = add i64 %t1, 1
  %t3 = icmp ult i64 0, %t2
  br i1 %t3, label %bb3, label %bb4

bb3:
  %t4 = call i64 @f()
  br label %bb4

bb4:
  %foo = phi i64 [ %t4, %bb3 ], [ 0, %bb2 ]
  br i1 %p, label %bb5, label %bb6

bb5:
  br i1 true, label %bb7, label %bb7

bb6:
  br i1 true, label %bb7, label %bb7

bb7:
  %t5 = add i64 %t1, 1
  br i1 %p, label %bb2, label %bb8

bb8:
  ret void
}

declare i64 @f()