; LLVM IR from ahampriyanshu/algo-ds-101 :: Data-Structures/Tree/Threaded Binary Tree/Threaded_Binary_Tree.ll (Z7pre_sucP6TBT_nd)

; 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.TBT_nd = type { i32, ptr, ptr, i32, i32 }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef ptr @_Z7pre_sucP6TBT_nd(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds %struct.TBT_nd, ptr %4, i32 0, i32 3
  %6 = load i32, ptr %5, align 8, !tbaa !9
  %7 = icmp eq i32 %6, 1
  br i1 %7, label %8, label %12

8:                                                ; preds = %1
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.TBT_nd, ptr %9, i32 0, i32 1
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  store ptr %11, ptr %2, align 8
  br label %26

12:                                               ; preds = %1
  br label %13

13:                                               ; preds = %18, %12
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.TBT_nd, ptr %14, i32 0, i32 4
  %16 = load i32, ptr %15, align 4, !tbaa !13
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %22

18:                                               ; preds = %13
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.TBT_nd, ptr %19, i32 0, i32 2
  %21 = load ptr, ptr %20, align 8, !tbaa !14
  store ptr %21, ptr %3, align 8, !tbaa !5
  br label %13, !llvm.loop !15

22:                                               ; preds = %13
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.TBT_nd, ptr %23, i32 0, i32 2
  %25 = load ptr, ptr %24, align 8, !tbaa !14
  store ptr %25, ptr %2, align 8
  br label %26

26:                                               ; preds = %22, %8
  %27 = load ptr, ptr %2, align 8
  ret ptr %27
}

attributes #0 = { mustprogress nounwind 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 24}
!10 = !{!"_ZTS6TBT_nd", !11, i64 0, !6, i64 8, !6, i64 16, !11, i64 24, !11, i64 28}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 8}
!13 = !{!10, !11, i64 28}
!14 = !{!10, !6, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


; 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 norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_Z7pre_sucP6TBT_nd(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = getelementptr inbounds i8, ptr %0, i64 24
  %3 = load i32, ptr %2, align 8, !tbaa !5
  %4 = icmp eq i32 %3, 1
  br i1 %4, label %8, label %.preheader

.preheader:                                       ; preds = %1
  %5 = getelementptr inbounds i8, ptr %0, i64 28
  %6 = load i32, ptr %5, align 4, !tbaa !11
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.lr.ph, label %._crit_edge

8:                                                ; preds = %1
  %9 = getelementptr inbounds i8, ptr %0, i64 8
  br label %16

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.07 = phi ptr [ %11, %.lr.ph ], [ %0, %.preheader ]
  %10 = getelementptr inbounds i8, ptr %.07, i64 16
  %11 = load ptr, ptr %10, align 8, !tbaa !12
  %12 = getelementptr inbounds i8, ptr %11, i64 28
  %13 = load i32, ptr %12, align 4, !tbaa !11
  %14 = icmp eq i32 %13, 0
  br i1 %14, label %.lr.ph, label %._crit_edge, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.0.lcssa = phi ptr [ %0, %.preheader ], [ %11, %.lr.ph ]
  %15 = getelementptr inbounds i8, ptr %.0.lcssa, i64 16
  br label %16

16:                                               ; preds = %._crit_edge, %8
  %.06.in = phi ptr [ %9, %8 ], [ %15, %._crit_edge ]
  %.06 = load ptr, ptr %.06.in, align 8, !tbaa !15
  ret ptr %.06
}

attributes #0 = { mustprogress nofree norecurse 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 24}
!6 = !{!"_ZTS6TBT_nd", !7, i64 0, !10, i64 8, !10, i64 16, !7, i64 24, !7, i64 28}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 28}
!12 = !{!6, !10, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !10, i64 0}


; Effective O3 passes: GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass