; LLVM IR from graphitemaster/libintrusive :: rb (rb_search)

; 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.rb_tree_s = type { ptr, ptr }
%struct.rb_node_s = type { i64, ptr, ptr }

; Function Attrs: nounwind uwtable
define dso_local ptr @rb_search(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.rb_tree_s, ptr %11, i32 0, i32 0
  %13 = load ptr, ptr %12, align 8, !tbaa !9
  store ptr %13, ptr %8, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %44, %3
  %15 = load ptr, ptr %8, align 8, !tbaa !5
  %16 = icmp ne ptr %15, null
  br i1 %16, label %17, label %45

17:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %18 = load ptr, ptr %7, align 8, !tbaa !5
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  %20 = load ptr, ptr %8, align 8, !tbaa !5
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.rb_tree_s, ptr %21, i32 0, i32 1
  %23 = load ptr, ptr %22, align 8, !tbaa !11
  %24 = call i32 %18(ptr noundef %19, ptr noundef %20, ptr noundef %23)
  store i32 %24, ptr %9, align 4, !tbaa !12
  %25 = load i32, ptr %9, align 4, !tbaa !12
  %26 = icmp slt i32 %25, 0
  br i1 %26, label %27, label %31

27:                                               ; preds = %17
  %28 = load ptr, ptr %8, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.rb_node_s, ptr %28, i32 0, i32 2
  %30 = load ptr, ptr %29, align 8, !tbaa !14
  store ptr %30, ptr %8, align 8, !tbaa !5
  br label %41

31:                                               ; preds = %17
  %32 = load i32, ptr %9, align 4, !tbaa !12
  %33 = icmp sgt i32 %32, 0
  br i1 %33, label %34, label %38

34:                                               ; preds = %31
  %35 = load ptr, ptr %8, align 8, !tbaa !5
  %36 = getelementptr inbounds %struct.rb_node_s, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !17
  store ptr %37, ptr %8, align 8, !tbaa !5
  br label %40

38:                                               ; preds = %31
  %39 = load ptr, ptr %8, align 8, !tbaa !5
  store ptr %39, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %42

40:                                               ; preds = %34
  br label %41

41:                                               ; preds = %40, %27
  store i32 0, ptr %10, align 4
  br label %42

42:                                               ; preds = %41, %38
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  %43 = load i32, ptr %10, align 4
  switch i32 %43, label %46 [
    i32 0, label %44
  ]

44:                                               ; preds = %42
  br label %14, !llvm.loop !18

45:                                               ; preds = %14
  store ptr null, ptr %4, align 8
  store i32 1, ptr %10, align 4
  br label %46

46:                                               ; preds = %45, %42
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %47 = load ptr, ptr %4, align 8
  ret ptr %47
}

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

; 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 }

!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 = !{!"rb_tree_s", !6, i64 0, !6, i64 8}
!11 = !{!10, !6, i64 8}
!12 = !{!13, !13, i64 0}
!13 = !{!"int", !7, i64 0}
!14 = !{!15, !6, i64 16}
!15 = !{!"rb_node_s", !16, i64 0, !6, i64 8, !6, i64 16}
!16 = !{!"long", !7, i64 0}
!17 = !{!15, !6, i64 8}
!18 = distinct !{!18, !19}
!19 = !{!"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 @rb_search(ptr nocapture noundef readonly %0, ptr noundef %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %.01321 = load ptr, ptr %0, align 8, !tbaa !5
  %.not22 = icmp eq ptr %.01321, null
  br i1 %.not22, label %.thread, label %.lr.ph

.lr.ph:                                           ; preds = %3
  %4 = getelementptr inbounds i8, ptr %0, i64 8
  br label %5

5:                                                ; preds = %.lr.ph, %10
  %.01323 = phi ptr [ %.01321, %.lr.ph ], [ %.013, %10 ]
  %6 = load ptr, ptr %4, align 8, !tbaa !9
  %7 = tail call i32 %2(ptr noundef %1, ptr noundef nonnull %.01323, ptr noundef %6) #1
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %10, label %9

9:                                                ; preds = %5
  %.not17 = icmp eq i32 %7, 0
  br i1 %.not17, label %.thread, label %10

10:                                               ; preds = %9, %5
  %.sink = phi i64 [ 16, %5 ], [ 8, %9 ]
  %11 = getelementptr inbounds i8, ptr %.01323, i64 %.sink
  %.013 = load ptr, ptr %11, align 8, !tbaa !5
  %.not = icmp eq ptr %.013, null
  br i1 %.not, label %.thread, label %5, !llvm.loop !11

.thread:                                          ; preds = %10, %9, %3
  %.013.lcssa = phi ptr [ null, %3 ], [ %.01323, %9 ], [ null, %10 ]
  ret ptr %.013.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 = !{!"rb_tree_s", !6, i64 0, !6, i64 8}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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