; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 15. Binary Tree/12 Maximum in Binary Tree/12b.ll (Z7maximumP4Node)

; 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.std::initializer_list" = type { ptr, i64 }
%class.Node = type { i32, ptr, ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z7maximumP4Node(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca %"class.std::initializer_list", align 8
  %5 = alloca [3 x 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 -2147483648, ptr %2, align 4
  br label %30

9:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 12, ptr %5) #3
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  %11 = getelementptr inbounds %class.Node, ptr %10, i32 0, i32 0
  %12 = load i32, ptr %11, align 8, !tbaa !9
  store i32 %12, ptr %5, align 4, !tbaa !12
  %13 = getelementptr inbounds i32, ptr %5, i64 1
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %class.Node, ptr %14, i32 0, i32 1
  %16 = load ptr, ptr %15, align 8, !tbaa !13
  %17 = call noundef i32 @_Z7maximumP4Node(ptr noundef %16)
  store i32 %17, ptr %13, align 4, !tbaa !12
  %18 = getelementptr inbounds i32, ptr %5, i64 2
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %class.Node, ptr %19, i32 0, i32 2
  %21 = load ptr, ptr %20, align 8, !tbaa !14
  %22 = call noundef i32 @_Z7maximumP4Node(ptr noundef %21)
  store i32 %22, ptr %18, align 4, !tbaa !12
  %23 = getelementptr inbounds %"class.std::initializer_list", ptr %4, i32 0, i32 0
  store ptr %5, ptr %23, align 8, !tbaa !15
  %24 = getelementptr inbounds %"class.std::initializer_list", ptr %4, i32 0, i32 1
  store i64 3, ptr %24, align 8, !tbaa !18
  %25 = getelementptr inbounds { ptr, i64 }, ptr %4, i32 0, i32 0
  %26 = load ptr, ptr %25, align 8
  %27 = getelementptr inbounds { ptr, i64 }, ptr %4, i32 0, i32 1
  %28 = load i64, ptr %27, align 8
  %29 = call noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr %26, i64 %28)
  store i32 %29, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 12, ptr %5) #3
  br label %30

30:                                               ; preds = %9, %8
  %31 = load i32, ptr %2, align 4
  ret i32 %31
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr, i64) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { inlinehint 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !11, i64 0}
!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 8}
!14 = !{!10, !6, i64 16}
!15 = !{!16, !6, i64 0}
!16 = !{!"_ZTSSt16initializer_listIiE", !6, i64 0, !17, i64 8}
!17 = !{!"long", !7, i64 0}
!18 = !{!16, !17, i64 8}


; 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
define dso_local noundef i32 @_Z7maximumP4Node(ptr noundef readonly %0) local_unnamed_addr #0 {
  %2 = alloca [3 x i32], align 4
  %3 = icmp eq ptr %0, null
  br i1 %3, label %common.ret5, label %4

common.ret5:                                      ; preds = %1, %4
  %common.ret5.op = phi i32 [ %14, %4 ], [ -2147483648, %1 ]
  ret i32 %common.ret5.op

4:                                                ; preds = %1
  call void @llvm.lifetime.start.p0(i64 12, ptr nonnull %2) #3
  %5 = load i32, ptr %0, align 8, !tbaa !5
  store i32 %5, ptr %2, align 4, !tbaa !11
  %6 = getelementptr inbounds i8, ptr %2, i64 4
  %7 = getelementptr inbounds i8, ptr %0, i64 8
  %8 = load ptr, ptr %7, align 8, !tbaa !12
  %9 = tail call noundef i32 @_Z7maximumP4Node(ptr noundef %8)
  store i32 %9, ptr %6, align 4, !tbaa !11
  %10 = getelementptr inbounds i8, ptr %2, i64 8
  %11 = getelementptr inbounds i8, ptr %0, i64 16
  %12 = load ptr, ptr %11, align 8, !tbaa !13
  %13 = tail call noundef i32 @_Z7maximumP4Node(ptr noundef %12)
  store i32 %13, ptr %10, align 4, !tbaa !11
  %14 = call noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr nonnull %2, i64 3)
  call void @llvm.lifetime.end.p0(i64 12, ptr nonnull %2) #3
  br label %common.ret5
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZSt3maxIiET_St16initializer_listIS0_E(ptr, i64) local_unnamed_addr #1

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { inlinehint 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !7, i64 0}
!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 8}
!13 = !{!6, !10, i64 16}


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