; LLVM IR from ahampriyanshu/algo-ds-101 :: Data-Structures/Tree/Binary-Tree/subtree_check.ll (Z12areIdenticalP4nodeS0_)

; 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"

%class.node = type { i32, ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z12areIdenticalP4nodeS0_(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 %4, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %12

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

11:                                               ; preds = %8
  store i1 true, ptr %3, align 1
  br label %46

12:                                               ; preds = %8, %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = icmp eq ptr %13, null
  br i1 %14, label %18, label %15

15:                                               ; preds = %12
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = icmp eq ptr %16, null
  br i1 %17, label %18, label %19

18:                                               ; preds = %15, %12
  store i1 false, ptr %3, align 1
  br label %46

19:                                               ; preds = %15
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds %class.node, ptr %20, i32 0, i32 0
  %22 = load i32, ptr %21, align 8, !tbaa !9
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = getelementptr inbounds %class.node, ptr %23, i32 0, i32 0
  %25 = load i32, ptr %24, align 8, !tbaa !9
  %26 = icmp eq i32 %22, %25
  br i1 %26, label %27, label %45

27:                                               ; preds = %19
  %28 = load ptr, ptr %4, align 8, !tbaa !5
  %29 = getelementptr inbounds %class.node, ptr %28, i32 0, i32 1
  %30 = load ptr, ptr %29, align 8, !tbaa !12
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds %class.node, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !12
  %34 = call noundef zeroext i1 @_Z12areIdenticalP4nodeS0_(ptr noundef %30, ptr noundef %33)
  br i1 %34, label %35, label %43

35:                                               ; preds = %27
  %36 = load ptr, ptr %4, align 8, !tbaa !5
  %37 = getelementptr inbounds %class.node, ptr %36, i32 0, i32 2
  %38 = load ptr, ptr %37, align 8, !tbaa !13
  %39 = load ptr, ptr %5, align 8, !tbaa !5
  %40 = getelementptr inbounds %class.node, ptr %39, i32 0, i32 2
  %41 = load ptr, ptr %40, align 8, !tbaa !13
  %42 = call noundef zeroext i1 @_Z12areIdenticalP4nodeS0_(ptr noundef %38, ptr noundef %41)
  br label %43

43:                                               ; preds = %35, %27
  %44 = phi i1 [ false, %27 ], [ %42, %35 ]
  store i1 %44, ptr %3, align 1
  br label %46

45:                                               ; preds = %19
  store i1 false, ptr %3, align 1
  br label %46

46:                                               ; preds = %45, %43, %18, %11
  %47 = load i1, ptr %3, align 1
  ret i1 %47
}

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, !11, i64 0}
!10 = !{!"_ZTS4node", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!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 nofree nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z12areIdenticalP4nodeS0_(ptr noundef readonly %0, ptr noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %or.cond17 = and i1 %3, %4
  br i1 %or.cond17, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %tailrecurse
  %5 = phi i1 [ %22, %tailrecurse ], [ %4, %2 ]
  %6 = phi i1 [ %21, %tailrecurse ], [ %3, %2 ]
  %.tr1619 = phi ptr [ %20, %tailrecurse ], [ %1, %2 ]
  %.tr18 = phi ptr [ %18, %tailrecurse ], [ %0, %2 ]
  %or.cond3 = or i1 %6, %5
  br i1 %or.cond3, label %._crit_edge, label %7

7:                                                ; preds = %.lr.ph
  %8 = load i32, ptr %.tr18, align 8, !tbaa !5
  %9 = load i32, ptr %.tr1619, align 8, !tbaa !5
  %10 = icmp eq i32 %8, %9
  br i1 %10, label %11, label %._crit_edge

11:                                               ; preds = %7
  %12 = getelementptr inbounds i8, ptr %.tr18, i64 8
  %13 = load ptr, ptr %12, align 8, !tbaa !11
  %14 = getelementptr inbounds i8, ptr %.tr1619, i64 8
  %15 = load ptr, ptr %14, align 8, !tbaa !11
  %16 = tail call noundef zeroext i1 @_Z12areIdenticalP4nodeS0_(ptr noundef %13, ptr noundef %15)
  br i1 %16, label %tailrecurse, label %._crit_edge

tailrecurse:                                      ; preds = %11
  %17 = getelementptr inbounds i8, ptr %.tr18, i64 16
  %18 = load ptr, ptr %17, align 8, !tbaa !12
  %19 = getelementptr inbounds i8, ptr %.tr1619, i64 16
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  %21 = icmp eq ptr %18, null
  %22 = icmp eq ptr %20, null
  %or.cond = and i1 %21, %22
  br i1 %or.cond, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %tailrecurse, %.lr.ph, %11, %7, %2
  %.0 = phi i1 [ true, %2 ], [ false, %7 ], [ false, %11 ], [ false, %.lr.ph ], [ true, %tailrecurse ]
  ret i1 %.0
}

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(read, inaccessiblemem: none) 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, !7, i64 0}
!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 8}
!12 = !{!6, !10, i64 16}


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