; LLVM IR from smv1999/CompetitiveProgrammingQuestionBank :: Data Structures/Trees/check_if_subtree.ll (Z9isSubTreeP4NodeS0_)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.Node = type { i32, ptr, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z12areIdenticalP4NodeS0_(ptr noundef, ptr noundef) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z9isSubTreeP4NodeS0_(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %6 = load ptr, ptr %5, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %9

8:                                                ; preds = %2
  store i1 true, ptr %3, align 1
  br label %32

9:                                                ; preds = %2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = icmp eq ptr %10, null
  br i1 %11, label %12, label %13

12:                                               ; preds = %9
  store i1 false, ptr %3, align 1
  br label %32

13:                                               ; preds = %9
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = call noundef zeroext i1 @_Z12areIdenticalP4NodeS0_(ptr noundef %14, ptr noundef %15)
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  store i1 true, ptr %3, align 1
  br label %32

18:                                               ; preds = %13
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.Node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = call noundef zeroext i1 @_Z9isSubTreeP4NodeS0_(ptr noundef %21, ptr noundef %22)
  br i1 %23, label %30, label %24

24:                                               ; preds = %18
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.Node, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !12
  %28 = load ptr, ptr %5, align 8, !tbaa !5
  %29 = call noundef zeroext i1 @_Z9isSubTreeP4NodeS0_(ptr noundef %27, ptr noundef %28)
  br label %30

30:                                               ; preds = %24, %18
  %31 = phi i1 [ true, %18 ], [ %29, %24 ]
  store i1 %31, ptr %3, align 1
  br label %32

32:                                               ; preds = %30, %17, %12, %8
  %33 = load i1, ptr %3, align 1
  ret i1 %33
}

attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS4Node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z12areIdenticalP4NodeS0_(ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z9isSubTreeP4NodeS0_(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %1, null
  br i1 %3, label %._crit_edge, label %.lr.ph.split

.lr.ph.split:                                     ; preds = %2
  %4 = icmp eq ptr %0, null
  br i1 %4, label %._crit_edge, label %.lr.ph22

.lr.ph22:                                         ; preds = %.lr.ph.split, %tailrecurse
  %.tr1221 = phi ptr [ %11, %tailrecurse ], [ %0, %.lr.ph.split ]
  %5 = tail call noundef zeroext i1 @_Z12areIdenticalP4NodeS0_(ptr noundef nonnull %.tr1221, ptr noundef nonnull %1)
  br i1 %5, label %._crit_edge, label %6

6:                                                ; preds = %.lr.ph22
  %7 = getelementptr inbounds i8, ptr %.tr1221, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %9 = tail call noundef zeroext i1 @_Z9isSubTreeP4NodeS0_(ptr noundef %8, ptr noundef nonnull %1)
  br i1 %9, label %._crit_edge, label %tailrecurse

tailrecurse:                                      ; preds = %6
  %10 = getelementptr inbounds i8, ptr %.tr1221, i64 16
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %12 = icmp eq ptr %11, null
  br i1 %12, label %._crit_edge, label %.lr.ph22

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph22, %6, %.lr.ph.split, %2
  %.0 = phi i1 [ true, %2 ], [ false, %.lr.ph.split ], [ true, %6 ], [ true, %.lr.ph22 ], [ false, %tailrecurse ]
  ret i1 %.0
}

attributes #0 = { mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !10, i64 8}
!6 = !{!"_ZTS4Node", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}


; Effective O3 passes: GlobalOptPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass