; LLVM IR from LamberttLiu/CS-Basic-SelfLearning :: 【DSA】数据结构与算法（C语言版本）/src/tree (tree_in_order_get_predecessor)

; 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.BiTNode = type { i32, ptr, ptr }

@finalNode = external dso_local global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local void @InOrderTraversal(ptr noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @GetPredecessor(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  %9 = icmp eq ptr %8, null
  br i1 %9, label %13, label %10

10:                                               ; preds = %2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = icmp eq ptr %11, null
  br i1 %12, label %13, label %14

13:                                               ; preds = %10, %2
  store i1 false, ptr %3, align 1
  br label %28

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load i32, ptr %15, align 4, !tbaa !9
  store i32 %16, ptr %6, align 4, !tbaa !9
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = load i32, ptr %6, align 4, !tbaa !9
  call void @InOrderTraversal(ptr noundef %17, i32 noundef %18)
  %19 = load ptr, ptr @finalNode, align 8, !tbaa !5
  %20 = icmp eq ptr %19, null
  br i1 %20, label %21, label %22

21:                                               ; preds = %14
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %27

22:                                               ; preds = %14
  %23 = load ptr, ptr @finalNode, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.BiTNode, ptr %23, i32 0, i32 0
  %25 = load i32, ptr %24, align 8, !tbaa !11
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  store i32 %25, ptr %26, align 4, !tbaa !9
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %27

27:                                               ; preds = %22, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %28

28:                                               ; preds = %27, %13
  %29 = load i1, ptr %3, align 1
  ret i1 %29
}

; 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"BiTNode", !10, i64 0, !6, i64 8, !6, i64 16}


; 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"

@finalNode = external dso_local local_unnamed_addr global ptr, align 8

; Function Attrs: nounwind uwtable
declare dso_local void @InOrderTraversal(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef zeroext i1 @GetPredecessor(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq ptr %0, null
  %4 = icmp eq ptr %1, null
  %or.cond = or i1 %3, %4
  br i1 %or.cond, label %10, label %5

5:                                                ; preds = %2
  %6 = load i32, ptr %1, align 4, !tbaa !5
  tail call void @InOrderTraversal(ptr noundef nonnull %0, i32 noundef %6)
  %7 = load ptr, ptr @finalNode, align 8, !tbaa !9
  %.not = icmp eq ptr %7, null
  br i1 %.not, label %10, label %8

8:                                                ; preds = %5
  %9 = load i32, ptr %7, align 8, !tbaa !11
  store i32 %9, ptr %1, align 4, !tbaa !5
  br label %10

10:                                               ; preds = %8, %5, %2
  %.1 = phi i1 [ false, %2 ], [ false, %5 ], [ true, %8 ]
  ret i1 %.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" }

!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 = !{!"BiTNode", !6, i64 0, !10, i64 8, !10, i64 16}


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