; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/ds/Shortest_Distance_Between_Nodes_Of_BST.ll (Z21ShortestDistanceUtillP4Nodei)

; 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
define dso_local noundef i32 @_Z21ShortestDistanceUtillP4Nodei(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct.Node, ptr %6, i32 0, i32 0
  %8 = load i32, ptr %7, align 8, !tbaa !11
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp eq i32 %8, %9
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %33

12:                                               ; preds = %2
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.Node, ptr %13, i32 0, i32 0
  %15 = load i32, ptr %14, align 8, !tbaa !11
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = icmp sgt i32 %15, %16
  br i1 %17, label %18, label %25

18:                                               ; preds = %12
  %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 !13
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = call noundef i32 @_Z21ShortestDistanceUtillP4Nodei(ptr noundef %21, i32 noundef %22)
  %24 = add nsw i32 1, %23
  store i32 %24, ptr %3, align 4
  br label %33

25:                                               ; preds = %12
  br label %26

26:                                               ; preds = %25
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.Node, ptr %27, i32 0, i32 2
  %29 = load ptr, ptr %28, align 8, !tbaa !14
  %30 = load i32, ptr %5, align 4, !tbaa !9
  %31 = call noundef i32 @_Z21ShortestDistanceUtillP4Nodei(ptr noundef %29, i32 noundef %30)
  %32 = add nsw i32 1, %31
  store i32 %32, ptr %3, align 4
  br label %33

33:                                               ; preds = %26, %18, %11
  %34 = load i32, ptr %3, align 4
  ret i32 %34
}

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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTS4Node", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !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 i32 @_Z21ShortestDistanceUtillP4Nodei(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  br label %tailrecurse26

tailrecurse26:                                    ; preds = %12, %2
  %accumulator.tr = phi i32 [ 0, %2 ], [ %accumulator.ret.tr, %12 ]
  %.tr = phi ptr [ %0, %2 ], [ %14, %12 ]
  %3 = load i32, ptr %.tr, align 8, !tbaa !5
  %4 = icmp eq i32 %3, %1
  br i1 %4, label %common.ret, label %.lr.ph

.lr.ph:                                           ; preds = %tailrecurse26, %tailrecurse
  %5 = phi i32 [ %10, %tailrecurse ], [ %3, %tailrecurse26 ]
  %.tr15 = phi ptr [ %8, %tailrecurse ], [ %.tr, %tailrecurse26 ]
  %accumulator.tr14 = phi i32 [ %9, %tailrecurse ], [ 0, %tailrecurse26 ]
  %6 = icmp sgt i32 %5, %1
  br i1 %6, label %tailrecurse, label %12

tailrecurse:                                      ; preds = %.lr.ph
  %7 = getelementptr inbounds i8, ptr %.tr15, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = add nuw nsw i32 %accumulator.tr14, 1
  %10 = load i32, ptr %8, align 8, !tbaa !5
  %11 = icmp eq i32 %10, %1
  br i1 %11, label %common.ret, label %.lr.ph

common.ret:                                       ; preds = %tailrecurse, %tailrecurse26
  %common.ret.op = phi i32 [ 0, %tailrecurse26 ], [ %9, %tailrecurse ]
  %accumulator.ret.tr28 = add i32 %common.ret.op, %accumulator.tr
  ret i32 %accumulator.ret.tr28

12:                                               ; preds = %.lr.ph
  %13 = getelementptr inbounds i8, ptr %.tr15, i64 16
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = add nuw i32 %accumulator.tr14, 1
  %accumulator.ret.tr = add i32 %15, %accumulator.tr
  br label %tailrecurse26
}

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,GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass