; LLVM IR from bartobri/data-structures-c :: binary-tree/postorder-stack-traversal (tree)

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

; Function Attrs: nounwind uwtable
define dso_local void @traverseTree(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @STACKinit()
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  call void @STACKpush(ptr noundef %5)
  br label %6

6:                                                ; preds = %28, %2
  %7 = call i32 @STACKcount()
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %9, label %31

9:                                                ; preds = %6
  %10 = call ptr @STACKpop()
  store ptr %10, ptr %3, align 8, !tbaa !5
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.treenode, ptr %11, i32 0, i32 1
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  %14 = icmp ne ptr %13, null
  br i1 %14, label %15, label %19

15:                                               ; preds = %9
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.treenode, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !9
  call void @STACKpush(ptr noundef %18)
  br label %19

19:                                               ; preds = %15, %9
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.treenode, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !12
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %28

24:                                               ; preds = %19
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.treenode, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !12
  call void @STACKpush(ptr noundef %27)
  br label %28

28:                                               ; preds = %24, %19
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  call void %29(ptr noundef %30)
  br label %6, !llvm.loop !13

31:                                               ; preds = %6
  ret void
}

declare void @STACKinit() #1

declare void @STACKpush(ptr noundef) #1

declare i32 @STACKcount() #1

declare ptr @STACKpop() #1

attributes #0 = { 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" }
attributes #1 = { "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/C++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"treenode", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"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: nounwind uwtable
define dso_local void @traverseTree(ptr noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  tail call void @STACKinit() #2
  tail call void @STACKpush(ptr noundef %0) #2
  %3 = tail call i32 @STACKcount() #2
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %13
  %5 = tail call ptr @STACKpop() #2
  %6 = getelementptr inbounds i8, ptr %5, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %9, label %8

8:                                                ; preds = %.lr.ph
  tail call void @STACKpush(ptr noundef nonnull %7) #2
  br label %9

9:                                                ; preds = %8, %.lr.ph
  %10 = getelementptr inbounds i8, ptr %5, i64 16
  %11 = load ptr, ptr %10, align 8, !tbaa !11
  %.not8 = icmp eq ptr %11, null
  br i1 %.not8, label %13, label %12

12:                                               ; preds = %9
  tail call void @STACKpush(ptr noundef nonnull %11) #2
  br label %13

13:                                               ; preds = %12, %9
  tail call void %1(ptr noundef nonnull %5) #2
  %14 = tail call i32 @STACKcount() #2
  %15 = icmp sgt i32 %14, 0
  br i1 %15, label %.lr.ph, label %._crit_edge, !llvm.loop !12

._crit_edge:                                      ; preds = %13, %2
  ret void
}

declare void @STACKinit() local_unnamed_addr #1

declare void @STACKpush(ptr noundef) local_unnamed_addr #1

declare i32 @STACKcount() local_unnamed_addr #1

declare ptr @STACKpop() local_unnamed_addr #1

attributes #0 = { 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" }
attributes #1 = { "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" }
attributes #2 = { nounwind }

!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 = !{!"treenode", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !10, i64 16}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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