; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/cp/largest_bst_in_btree.ll (Z10isvalidbstP4node)

; 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 { i32, ptr, ptr }

; 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: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z5isbstP4nodeii(ptr noundef, i32 noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z5nodesP4node(ptr noundef) #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z10isvalidbstP4node(ptr noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i32 0, ptr %2, align 4
  br label %26

9:                                                ; preds = %1
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = call noundef zeroext i1 @_Z5isbstP4nodeii(ptr noundef %10, i32 noundef -2147483648, i32 noundef 2147483647)
  br i1 %11, label %12, label %15

12:                                               ; preds = %9
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = call noundef i32 @_Z5nodesP4node(ptr noundef %13)
  store i32 %14, ptr %2, align 4
  br label %26

15:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %class.node, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !9
  %19 = call noundef i32 @_Z10isvalidbstP4node(ptr noundef %18)
  store i32 %19, ptr %4, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = getelementptr inbounds %class.node, ptr %20, i32 0, i32 2
  %22 = load ptr, ptr %21, align 8, !tbaa !13
  %23 = call noundef i32 @_Z10isvalidbstP4node(ptr noundef %22)
  store i32 %23, ptr %5, align 4, !tbaa !12
  %24 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %4, ptr noundef nonnull align 4 dereferenceable(4) %5)
  %25 = load i32, ptr %24, align 4, !tbaa !12
  store i32 %25, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %26

26:                                               ; preds = %15, %12, %8
  %27 = load i32, ptr %2, align 4
  ret i32 %27
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { inlinehint mustprogress 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 #3 = { 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", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!10, !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"

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z5isbstP4nodeii(ptr noundef, i32 noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare dso_local noundef i32 @_Z5nodesP4node(ptr noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z10isvalidbstP4node(ptr noundef %0) local_unnamed_addr #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = icmp eq ptr %0, null
  br i1 %4, label %common.ret6, label %5

5:                                                ; preds = %1
  %6 = tail call noundef zeroext i1 @_Z5isbstP4nodeii(ptr noundef nonnull %0, i32 noundef -2147483648, i32 noundef 2147483647)
  br i1 %6, label %7, label %9

7:                                                ; preds = %5
  %8 = tail call noundef i32 @_Z5nodesP4node(ptr noundef nonnull %0)
  br label %common.ret6

common.ret6:                                      ; preds = %1, %7, %9
  %common.ret6.op = phi i32 [ %17, %9 ], [ %8, %7 ], [ 0, %1 ]
  ret i32 %common.ret6.op

9:                                                ; preds = %5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #3
  %10 = getelementptr inbounds i8, ptr %0, i64 8
  %11 = load ptr, ptr %10, align 8, !tbaa !5
  %12 = tail call noundef i32 @_Z10isvalidbstP4node(ptr noundef %11)
  store i32 %12, ptr %2, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #3
  %13 = getelementptr inbounds i8, ptr %0, i64 16
  %14 = load ptr, ptr %13, align 8, !tbaa !12
  %15 = tail call noundef i32 @_Z10isvalidbstP4node(ptr noundef %14)
  store i32 %15, ptr %3, align 4, !tbaa !11
  %16 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %2, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %17 = load i32, ptr %16, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #3
  br label %common.ret6
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { inlinehint mustprogress 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 #3 = { 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, !10, i64 8}
!6 = !{!"_ZTS4node", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!6, !10, i64 16}


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