; LLVM IR from PetarV-/Algorithms :: Data Structures/Binary Search Tree.ll (ZN3BST11predecessorEP4Node)

; 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"

%class.Node = type { i8, i32, ptr, ptr, ptr, ptr }

; Function Attrs: mustprogress uwtable
declare dso_local noundef ptr @_ZN3BST7maximumEv(ptr noundef nonnull align 8 dereferenceable(8)) #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN3BST11predecessorEP4Node(ptr noundef nonnull align 8 dereferenceable(8) %0, ptr noundef %1) #0 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %7 = load ptr, ptr %4, align 8
  %8 = load ptr, ptr %5, align 8, !tbaa !5
  %9 = getelementptr inbounds %class.Node, ptr %8, i32 0, i32 2
  %10 = load ptr, ptr %9, align 8, !tbaa !9
  %11 = icmp ne ptr %10, null
  br i1 %11, label %12, label %17

12:                                               ; preds = %2
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds %class.Node, ptr %13, i32 0, i32 2
  %15 = load ptr, ptr %14, align 8, !tbaa !9
  %16 = call noundef ptr @_ZN3BST7maximumEv(ptr noundef nonnull align 8 dereferenceable(8) %15)
  store ptr %16, ptr %3, align 8
  br label %43

17:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = getelementptr inbounds %class.Node, ptr %18, i32 0, i32 4
  %20 = load ptr, ptr %19, align 8, !tbaa !12
  store ptr %20, ptr %6, align 8, !tbaa !5
  br label %21

21:                                               ; preds = %36, %17
  %22 = load ptr, ptr %6, align 8, !tbaa !5
  %23 = icmp ne ptr %22, null
  br i1 %23, label %24, label %34

24:                                               ; preds = %21
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = getelementptr inbounds %class.Node, ptr %25, i32 0, i32 0
  %27 = load i8, ptr %26, align 8, !tbaa !13
  %28 = sext i8 %27 to i32
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %class.Node, ptr %29, i32 0, i32 0
  %31 = load i8, ptr %30, align 8, !tbaa !13
  %32 = sext i8 %31 to i32
  %33 = icmp sgt i32 %28, %32
  br label %34

34:                                               ; preds = %24, %21
  %35 = phi i1 [ false, %21 ], [ %33, %24 ]
  br i1 %35, label %36, label %41

36:                                               ; preds = %34
  %37 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %37, ptr %5, align 8, !tbaa !5
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = getelementptr inbounds %class.Node, ptr %38, i32 0, i32 4
  %40 = load ptr, ptr %39, align 8, !tbaa !12
  store ptr %40, ptr %6, align 8, !tbaa !5
  br label %21, !llvm.loop !14

41:                                               ; preds = %34
  %42 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %42, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %43

43:                                               ; preds = %41, %12
  %44 = load ptr, ptr %3, align 8
  ret ptr %44
}

; 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 = { 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" }
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++ TBAA"}
!9 = !{!10, !6, i64 8}
!10 = !{!"_ZTS4Node", !7, i64 0, !11, i64 4, !6, i64 8, !6, i64 16, !6, i64 24, !6, i64 32}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !6, i64 24}
!13 = !{!10, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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: mustprogress uwtable
declare dso_local noundef ptr @_ZN3BST7maximumEv(ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN3BST11predecessorEP4Node(ptr nocapture noundef nonnull readnone align 8 dereferenceable(8) %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 align 2 {
  %3 = getelementptr inbounds i8, ptr %1, i64 8
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %.not = icmp eq ptr %4, null
  br i1 %.not, label %.preheader, label %5

5:                                                ; preds = %2
  %6 = tail call noundef ptr @_ZN3BST7maximumEv(ptr noundef nonnull align 8 dereferenceable(8) %4)
  br label %.critedge

.preheader:                                       ; preds = %2, %7
  %.011 = phi ptr [ %.0, %7 ], [ %1, %2 ]
  %.0.in = getelementptr inbounds i8, ptr %.011, i64 24
  %.0 = load ptr, ptr %.0.in, align 8, !tbaa !11
  %.not14 = icmp eq ptr %.0, null
  br i1 %.not14, label %.critedge, label %7

7:                                                ; preds = %.preheader
  %8 = load i8, ptr %.0, align 8, !tbaa !12
  %9 = load i8, ptr %.011, align 8, !tbaa !12
  %10 = icmp sgt i8 %8, %9
  br i1 %10, label %.preheader, label %.critedge, !llvm.loop !13

.critedge:                                        ; preds = %7, %.preheader, %5
  %.012 = phi ptr [ %6, %5 ], [ %.0, %7 ], [ null, %.preheader ]
  ret ptr %.012
}

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, !10, i64 8}
!6 = !{!"_ZTS4Node", !7, i64 0, !9, i64 4, !10, i64 8, !10, i64 16, !10, i64 24, !10, i64 32}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!"int", !7, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!6, !10, i64 24}
!12 = !{!6, !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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