; LLVM IR from aspuru-guzik-group/qtorch :: nlopt-2.4.2/util (redblack)

; 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_node_s = type { ptr, ptr, ptr, ptr, i32 }

@nil = external dso_local global %struct.rb_node_s, align 8

; 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 @rb_tree_pred(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = icmp ne ptr %5, null
  br i1 %6, label %8, label %7

7:                                                ; preds = %1
  store ptr null, ptr %2, align 8
  br label %53

8:                                                ; preds = %1
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct.rb_node_s, ptr %9, i32 0, i32 2
  %11 = load ptr, ptr %10, align 8, !tbaa !9
  %12 = icmp eq ptr %11, @nil
  br i1 %12, label %13, label %38

13:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  br label %14

14:                                               ; preds = %28, %13
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %15, ptr %4, align 8, !tbaa !5
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.rb_node_s, ptr %16, i32 0, i32 0
  %18 = load ptr, ptr %17, align 8, !tbaa !12
  store ptr %18, ptr %3, align 8, !tbaa !5
  br label %19

19:                                               ; preds = %14
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = load ptr, ptr %3, align 8, !tbaa !5
  %22 = getelementptr inbounds %struct.rb_node_s, ptr %21, i32 0, i32 2
  %23 = load ptr, ptr %22, align 8, !tbaa !9
  %24 = icmp eq ptr %20, %23
  br i1 %24, label %25, label %28

25:                                               ; preds = %19
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = icmp ne ptr %26, @nil
  br label %28

28:                                               ; preds = %25, %19
  %29 = phi i1 [ false, %19 ], [ %27, %25 ]
  br i1 %29, label %14, label %30, !llvm.loop !13

30:                                               ; preds = %28
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = icmp eq ptr %31, @nil
  br i1 %32, label %33, label %34

33:                                               ; preds = %30
  br label %36

34:                                               ; preds = %30
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  br label %36

36:                                               ; preds = %34, %33
  %37 = phi ptr [ null, %33 ], [ %35, %34 ]
  store ptr %37, ptr %2, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %53

38:                                               ; preds = %8
  %39 = load ptr, ptr %3, align 8, !tbaa !5
  %40 = getelementptr inbounds %struct.rb_node_s, ptr %39, i32 0, i32 2
  %41 = load ptr, ptr %40, align 8, !tbaa !9
  store ptr %41, ptr %3, align 8, !tbaa !5
  br label %42

42:                                               ; preds = %47, %38
  %43 = load ptr, ptr %3, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.rb_node_s, ptr %43, i32 0, i32 1
  %45 = load ptr, ptr %44, align 8, !tbaa !15
  %46 = icmp ne ptr %45, @nil
  br i1 %46, label %47, label %51

47:                                               ; preds = %42
  %48 = load ptr, ptr %3, align 8, !tbaa !5
  %49 = getelementptr inbounds %struct.rb_node_s, ptr %48, i32 0, i32 1
  %50 = load ptr, ptr %49, align 8, !tbaa !15
  store ptr %50, ptr %3, align 8, !tbaa !5
  br label %42, !llvm.loop !16

51:                                               ; preds = %42
  %52 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %52, ptr %2, align 8
  br label %53

53:                                               ; preds = %51, %36, %7
  %54 = load ptr, ptr %2, align 8
  ret ptr %54
}

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 16}
!10 = !{!"rb_node_s", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24, !11, i64 32}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = !{!10, !6, i64 8}
!16 = distinct !{!16, !14}


; 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"

%struct.rb_node_s = type { ptr, ptr, ptr, ptr, i32 }

@nil = external dso_local global %struct.rb_node_s, align 8

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @rb_tree_pred(ptr noundef readonly %0) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.loopexit, label %2

2:                                                ; preds = %1
  %3 = getelementptr inbounds i8, ptr %0, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = icmp eq ptr %4, @nil
  br i1 %5, label %.preheader, label %.preheader19

.preheader:                                       ; preds = %2, %.preheader
  %.014 = phi ptr [ %6, %.preheader ], [ %0, %2 ]
  %6 = load ptr, ptr %.014, align 8, !tbaa !11
  %7 = getelementptr inbounds i8, ptr %6, i64 16
  %8 = load ptr, ptr %7, align 8, !tbaa !5
  %9 = icmp eq ptr %.014, %8
  %10 = icmp ne ptr %6, @nil
  %11 = and i1 %10, %9
  br i1 %11, label %.preheader, label %12, !llvm.loop !12

12:                                               ; preds = %.preheader
  %13 = icmp eq ptr %6, @nil
  %14 = select i1 %13, ptr null, ptr %6
  br label %.loopexit

.preheader19:                                     ; preds = %2, %.preheader19
  %.1 = phi ptr [ %16, %.preheader19 ], [ %4, %2 ]
  %15 = getelementptr inbounds i8, ptr %.1, i64 8
  %16 = load ptr, ptr %15, align 8, !tbaa !14
  %.not18 = icmp eq ptr %16, @nil
  br i1 %.not18, label %.loopexit, label %.preheader19, !llvm.loop !15

.loopexit:                                        ; preds = %.preheader19, %1, %12
  %.0 = phi ptr [ %14, %12 ], [ null, %1 ], [ %.1, %.preheader19 ]
  ret ptr %.0
}

attributes #0 = { nofree norecurse nosync nounwind 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 16}
!6 = !{!"rb_node_s", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !10, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = !{!6, !7, i64 8}
!15 = distinct !{!15, !13}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass