; LLVM IR from FOSS-UCSC/FOSSALGO :: data-structures/ds-btree/c (binary_search_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.node = type { i32, ptr, ptr }

@root = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
define dso_local void @insert(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %6 = call noalias ptr @malloc(i64 noundef 24) #4
  store ptr %6, ptr %3, align 8, !tbaa !9
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = load ptr, ptr %3, align 8, !tbaa !9
  %9 = getelementptr inbounds %struct.node, ptr %8, i32 0, i32 0
  store i32 %7, ptr %9, align 8, !tbaa !11
  %10 = load ptr, ptr %3, align 8, !tbaa !9
  %11 = getelementptr inbounds %struct.node, ptr %10, i32 0, i32 2
  store ptr null, ptr %11, align 8, !tbaa !13
  %12 = load ptr, ptr %3, align 8, !tbaa !9
  %13 = getelementptr inbounds %struct.node, ptr %12, i32 0, i32 1
  store ptr null, ptr %13, align 8, !tbaa !14
  %14 = load ptr, ptr @root, align 8, !tbaa !9
  store ptr %14, ptr %4, align 8, !tbaa !9
  %15 = load ptr, ptr @root, align 8, !tbaa !9
  %16 = icmp eq ptr %15, null
  br i1 %16, label %17, label %19

17:                                               ; preds = %1
  %18 = load ptr, ptr %3, align 8, !tbaa !9
  store ptr %18, ptr @root, align 8, !tbaa !9
  br label %59

19:                                               ; preds = %1
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %20 = load ptr, ptr @root, align 8, !tbaa !9
  store ptr %20, ptr %5, align 8, !tbaa !9
  br label %21

21:                                               ; preds = %41, %19
  %22 = load ptr, ptr %5, align 8, !tbaa !9
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %42

24:                                               ; preds = %21
  %25 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %25, ptr %4, align 8, !tbaa !9
  %26 = load ptr, ptr %5, align 8, !tbaa !9
  %27 = getelementptr inbounds %struct.node, ptr %26, i32 0, i32 0
  %28 = load i32, ptr %27, align 8, !tbaa !11
  %29 = load ptr, ptr %3, align 8, !tbaa !9
  %30 = getelementptr inbounds %struct.node, ptr %29, i32 0, i32 0
  %31 = load i32, ptr %30, align 8, !tbaa !11
  %32 = icmp slt i32 %28, %31
  br i1 %32, label %33, label %37

33:                                               ; preds = %24
  %34 = load ptr, ptr %5, align 8, !tbaa !9
  %35 = getelementptr inbounds %struct.node, ptr %34, i32 0, i32 1
  %36 = load ptr, ptr %35, align 8, !tbaa !14
  store ptr %36, ptr %5, align 8, !tbaa !9
  br label %41

37:                                               ; preds = %24
  %38 = load ptr, ptr %5, align 8, !tbaa !9
  %39 = getelementptr inbounds %struct.node, ptr %38, i32 0, i32 2
  %40 = load ptr, ptr %39, align 8, !tbaa !13
  store ptr %40, ptr %5, align 8, !tbaa !9
  br label %41

41:                                               ; preds = %37, %33
  br label %21, !llvm.loop !15

42:                                               ; preds = %21
  %43 = load ptr, ptr %4, align 8, !tbaa !9
  %44 = getelementptr inbounds %struct.node, ptr %43, i32 0, i32 0
  %45 = load i32, ptr %44, align 8, !tbaa !11
  %46 = load ptr, ptr %3, align 8, !tbaa !9
  %47 = getelementptr inbounds %struct.node, ptr %46, i32 0, i32 0
  %48 = load i32, ptr %47, align 8, !tbaa !11
  %49 = icmp slt i32 %45, %48
  br i1 %49, label %50, label %54

50:                                               ; preds = %42
  %51 = load ptr, ptr %3, align 8, !tbaa !9
  %52 = load ptr, ptr %4, align 8, !tbaa !9
  %53 = getelementptr inbounds %struct.node, ptr %52, i32 0, i32 1
  store ptr %51, ptr %53, align 8, !tbaa !14
  br label %58

54:                                               ; preds = %42
  %55 = load ptr, ptr %3, align 8, !tbaa !9
  %56 = load ptr, ptr %4, align 8, !tbaa !9
  %57 = getelementptr inbounds %struct.node, ptr %56, i32 0, i32 2
  store ptr %55, ptr %57, align 8, !tbaa !13
  br label %58

58:                                               ; preds = %54, %50
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  br label %59

59:                                               ; preds = %58, %17
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nounwind allocsize(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 #3 = { nounwind }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"node", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 16}
!14 = !{!12, !10, i64 8}
!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"

@root = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nofree nounwind uwtable
define dso_local void @insert(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #3
  store i32 %0, ptr %2, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 8
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %3, i8 0, i64 16, i1 false)
  %4 = load ptr, ptr @root, align 8, !tbaa !11
  %5 = icmp eq ptr %4, null
  br i1 %5, label %13, label %.preheader

.preheader:                                       ; preds = %1, %.preheader
  %.018 = phi ptr [ %.1, %.preheader ], [ %4, %1 ]
  %6 = load i32, ptr %.018, align 8, !tbaa !5
  %7 = icmp slt i32 %6, %0
  %.1.in.v = select i1 %7, i64 8, i64 16
  %.1.in = getelementptr inbounds i8, ptr %.018, i64 %.1.in.v
  %.1 = load ptr, ptr %.1.in, align 8, !tbaa !11
  %.not = icmp eq ptr %.1, null
  br i1 %.not, label %8, label %.preheader, !llvm.loop !12

8:                                                ; preds = %.preheader
  br i1 %7, label %9, label %11

9:                                                ; preds = %8
  %10 = getelementptr inbounds i8, ptr %.018, i64 8
  br label %13

11:                                               ; preds = %8
  %12 = getelementptr inbounds i8, ptr %.018, i64 16
  br label %13

13:                                               ; preds = %1, %9, %11
  %.sink = phi ptr [ %10, %9 ], [ %12, %11 ], [ @root, %1 ]
  store ptr %2, ptr %.sink, align 8, !tbaa !11
  ret void
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { nofree 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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind allocsize(0) }

!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 = !{!"node", !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 = !{!10, !10, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass