; LLVM IR from VAR-solutions/Algorithms :: Graphs/dfs/c (dfs)

; 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.Graph = type { i32, ptr, ptr }
%struct.node = type { i32, ptr }

@.str = external hidden unnamed_addr constant [13 x i8], align 1

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

; Function Attrs: nounwind uwtable
define dso_local void @DFS(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.Graph, ptr %8, i32 0, i32 2
  %10 = load ptr, ptr %9, align 8, !tbaa !11
  %11 = load i32, ptr %4, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds ptr, ptr %10, i64 %12
  %14 = load ptr, ptr %13, align 8, !tbaa !5
  store ptr %14, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %15, ptr %6, align 8, !tbaa !5
  %16 = load ptr, ptr %3, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.Graph, ptr %16, i32 0, i32 1
  %18 = load ptr, ptr %17, align 8, !tbaa !13
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i32, ptr %18, i64 %20
  store i32 1, ptr %21, align 4, !tbaa !9
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %22)
  br label %24

24:                                               ; preds = %42, %2
  %25 = load ptr, ptr %6, align 8, !tbaa !5
  %26 = icmp ne ptr %25, null
  br i1 %26, label %27, label %46

27:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %28 = load ptr, ptr %6, align 8, !tbaa !5
  %29 = getelementptr inbounds %struct.node, ptr %28, i32 0, i32 0
  %30 = load i32, ptr %29, align 8, !tbaa !14
  store i32 %30, ptr %7, align 4, !tbaa !9
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.Graph, ptr %31, i32 0, i32 1
  %33 = load ptr, ptr %32, align 8, !tbaa !13
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i32, ptr %33, i64 %35
  %37 = load i32, ptr %36, align 4, !tbaa !9
  %38 = icmp eq i32 %37, 0
  br i1 %38, label %39, label %42

39:                                               ; preds = %27
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = load i32, ptr %7, align 4, !tbaa !9
  call void @DFS(ptr noundef %40, i32 noundef %41)
  br label %42

42:                                               ; preds = %39, %27
  %43 = load ptr, ptr %6, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.node, ptr %43, i32 0, i32 1
  %45 = load ptr, ptr %44, align 8, !tbaa !16
  store ptr %45, ptr %6, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %24, !llvm.loop !17

46:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret void
}

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

declare i32 @printf(ptr noundef, ...) #2

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 = { "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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 16}
!12 = !{!"Graph", !10, i64 0, !6, i64 8, !6, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!15, !10, i64 0}
!15 = !{!"node", !10, i64 0, !6, i64 8}
!16 = !{!15, !6, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"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"

@.str = external hidden unnamed_addr constant [13 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local void @DFS(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 16
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = sext i32 %1 to i64
  %6 = getelementptr inbounds ptr, ptr %4, i64 %5
  %7 = load ptr, ptr %6, align 8, !tbaa !11
  %8 = getelementptr inbounds i8, ptr %0, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !12
  %10 = getelementptr inbounds i32, ptr %9, i64 %5
  store i32 1, ptr %10, align 4, !tbaa !13
  %11 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %1)
  %.not12 = icmp eq ptr %7, null
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %19
  %.013 = phi ptr [ %21, %19 ], [ %7, %2 ]
  %12 = load i32, ptr %.013, align 8, !tbaa !14
  %13 = load ptr, ptr %8, align 8, !tbaa !12
  %14 = sext i32 %12 to i64
  %15 = getelementptr inbounds i32, ptr %13, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !13
  %17 = icmp eq i32 %16, 0
  br i1 %17, label %18, label %19

18:                                               ; preds = %.lr.ph
  tail call void @DFS(ptr noundef nonnull %0, i32 noundef %12)
  br label %19

19:                                               ; preds = %18, %.lr.ph
  %20 = getelementptr inbounds i8, ptr %.013, i64 8
  %21 = load ptr, ptr %20, align 8, !tbaa !16
  %.not = icmp eq ptr %21, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !17

._crit_edge:                                      ; preds = %19, %2
  ret void
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { nofree 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 = { nofree nounwind "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 16}
!6 = !{!"Graph", !7, i64 0, !10, i64 8, !10, i64 16}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!10, !10, i64 0}
!12 = !{!6, !10, i64 8}
!13 = !{!7, !7, i64 0}
!14 = !{!15, !7, i64 0}
!15 = !{!"node", !7, i64 0, !10, i64 8}
!16 = !{!15, !10, i64 8}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}


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