; LLVM IR from lekkas/c-algorithms :: src/algos (BinaryTree)

; 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.BTree = type { ptr, %struct.DataOps }
%struct.DataOps = type { ptr, ptr }
%struct.BTreeNode = type { ptr, ptr, ptr, ptr }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local ptr @findBTreeNode(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.BTree, ptr %8, i32 0, i32 0
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  store ptr %10, ptr %6, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %47, %2
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  %13 = icmp ne ptr %12, null
  br i1 %13, label %14, label %48

14:                                               ; preds = %11
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.BTree, ptr %15, i32 0, i32 1
  %17 = getelementptr inbounds %struct.DataOps, ptr %16, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8, !tbaa !12
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = getelementptr inbounds %struct.BTreeNode, ptr %20, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !13
  %23 = call i32 %18(ptr noundef %19, ptr noundef %22)
  %24 = icmp slt i32 %23, 0
  br i1 %24, label %25, label %29

25:                                               ; preds = %14
  %26 = load ptr, ptr %6, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.BTreeNode, ptr %26, i32 0, i32 1
  %28 = load ptr, ptr %27, align 8, !tbaa !15
  store ptr %28, ptr %6, align 8, !tbaa !5
  br label %47

29:                                               ; preds = %14
  %30 = load ptr, ptr %4, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.BTree, ptr %30, i32 0, i32 1
  %32 = getelementptr inbounds %struct.DataOps, ptr %31, i32 0, i32 0
  %33 = load ptr, ptr %32, align 8, !tbaa !12
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  %35 = load ptr, ptr %6, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.BTreeNode, ptr %35, i32 0, i32 0
  %37 = load ptr, ptr %36, align 8, !tbaa !13
  %38 = call i32 %33(ptr noundef %34, ptr noundef %37)
  %39 = icmp sgt i32 %38, 0
  br i1 %39, label %40, label %44

40:                                               ; preds = %29
  %41 = load ptr, ptr %6, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.BTreeNode, ptr %41, i32 0, i32 2
  %43 = load ptr, ptr %42, align 8, !tbaa !16
  store ptr %43, ptr %6, align 8, !tbaa !5
  br label %46

44:                                               ; preds = %29
  %45 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %45, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %49

46:                                               ; preds = %40
  br label %47

47:                                               ; preds = %46, %25
  br label %11, !llvm.loop !17

48:                                               ; preds = %11
  store ptr null, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %49

49:                                               ; preds = %48, %44
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %50 = load ptr, ptr %3, align 8
  ret ptr %50
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"BTree", !6, i64 0, !11, i64 8}
!11 = !{!"DataOps", !6, i64 0, !6, i64 8}
!12 = !{!10, !6, i64 8}
!13 = !{!14, !6, i64 0}
!14 = !{!"BTreeNode", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!15 = !{!14, !6, i64 8}
!16 = !{!14, !6, i64 16}
!17 = distinct !{!17, !18}
!18 = !{!"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 noundef ptr @findBTreeNode(ptr nocapture noundef readonly %0, ptr noundef %1) local_unnamed_addr #0 {
  %.013 = load ptr, ptr %0, align 8, !tbaa !5
  %.not14 = icmp eq ptr %.013, null
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  br label %4

4:                                                ; preds = %.lr.ph, %14
  %.015 = phi ptr [ %.013, %.lr.ph ], [ %.0, %14 ]
  %5 = load ptr, ptr %3, align 8, !tbaa !9
  %6 = load ptr, ptr %.015, align 8, !tbaa !12
  %7 = tail call i32 %5(ptr noundef %1, ptr noundef %6) #1
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %14, label %9

9:                                                ; preds = %4
  %10 = load ptr, ptr %3, align 8, !tbaa !9
  %11 = load ptr, ptr %.015, align 8, !tbaa !12
  %12 = tail call i32 %10(ptr noundef %1, ptr noundef %11) #1
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %14, label %._crit_edge

14:                                               ; preds = %9, %4
  %.sink = phi i64 [ 8, %4 ], [ 16, %9 ]
  %15 = getelementptr inbounds i8, ptr %.015, i64 %.sink
  %.0 = load ptr, ptr %15, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %._crit_edge, label %4, !llvm.loop !14

._crit_edge:                                      ; preds = %9, %14, %2
  %.0.lcssa = phi ptr [ null, %2 ], [ null, %14 ], [ %.015, %9 ]
  ret ptr %.0.lcssa
}

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 = { 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, !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 = !{!"BTree", !6, i64 0, !11, i64 8}
!11 = !{!"DataOps", !6, i64 0, !6, i64 8}
!12 = !{!13, !6, i64 0}
!13 = !{!"BTreeNode", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


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