; LLVM IR from AlgoGenesis/C :: Graph Algorithms/Graph_Reversal (program)

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

; Function Attrs: nounwind uwtable
define dso_local void @pushBack(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.AdjList, ptr %5, i32 0, i32 1
  %7 = load i32, ptr %6, align 8, !tbaa !11
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.AdjList, ptr %8, i32 0, i32 2
  %10 = load i32, ptr %9, align 4, !tbaa !13
  %11 = icmp eq i32 %7, %10
  br i1 %11, label %12, label %38

12:                                               ; preds = %2
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.AdjList, ptr %13, i32 0, i32 2
  %15 = load i32, ptr %14, align 4, !tbaa !13
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %12
  br label %23

18:                                               ; preds = %12
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.AdjList, ptr %19, i32 0, i32 2
  %21 = load i32, ptr %20, align 4, !tbaa !13
  %22 = mul nsw i32 %21, 2
  br label %23

23:                                               ; preds = %18, %17
  %24 = phi i32 [ 2, %17 ], [ %22, %18 ]
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.AdjList, ptr %25, i32 0, i32 2
  store i32 %24, ptr %26, align 4, !tbaa !13
  %27 = load ptr, ptr %3, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.AdjList, ptr %27, i32 0, i32 0
  %29 = load ptr, ptr %28, align 8, !tbaa !14
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.AdjList, ptr %30, i32 0, i32 2
  %32 = load i32, ptr %31, align 4, !tbaa !13
  %33 = sext i32 %32 to i64
  %34 = mul i64 %33, 4
  %35 = call ptr @realloc(ptr noundef %29, i64 noundef %34) #2
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = getelementptr inbounds %struct.AdjList, ptr %36, i32 0, i32 0
  store ptr %35, ptr %37, align 8, !tbaa !14
  br label %38

38:                                               ; preds = %23, %2
  %39 = load i32, ptr %4, align 4, !tbaa !9
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = getelementptr inbounds %struct.AdjList, ptr %40, i32 0, i32 0
  %42 = load ptr, ptr %41, align 8, !tbaa !14
  %43 = load ptr, ptr %3, align 8, !tbaa !5
  %44 = getelementptr inbounds %struct.AdjList, ptr %43, i32 0, i32 1
  %45 = load i32, ptr %44, align 8, !tbaa !11
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %44, align 8, !tbaa !11
  %47 = sext i32 %45 to i64
  %48 = getelementptr inbounds i32, ptr %42, i64 %47
  store i32 %39, ptr %48, align 4, !tbaa !9
  ret void
}

; Function Attrs: nounwind allocsize(1)
declare ptr @realloc(ptr noundef, i64 noundef) #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 = { nounwind allocsize(1) "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 = { nounwind allocsize(1) }

!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 8}
!12 = !{!"", !6, i64 0, !10, i64 8, !10, i64 12}
!13 = !{!12, !10, i64 12}
!14 = !{!12, !6, i64 0}


; 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 nounwind willreturn uwtable
define dso_local void @pushBack(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i32, ptr %3, align 8, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %0, i64 12
  %6 = load i32, ptr %5, align 4, !tbaa !11
  %7 = icmp eq i32 %4, %6
  %.pre = load ptr, ptr %0, align 8, !tbaa !12
  br i1 %7, label %8, label %14

8:                                                ; preds = %2
  %9 = icmp eq i32 %4, 0
  %10 = shl nsw i32 %4, 1
  %spec.select = select i1 %9, i32 2, i32 %10
  store i32 %spec.select, ptr %5, align 4, !tbaa !11
  %11 = sext i32 %spec.select to i64
  %12 = shl nsw i64 %11, 2
  %13 = tail call ptr @realloc(ptr noundef %.pre, i64 noundef %12) #2
  store ptr %13, ptr %0, align 8, !tbaa !12
  %.pre10 = load i32, ptr %3, align 8, !tbaa !5
  br label %14

14:                                               ; preds = %8, %2
  %15 = phi i32 [ %.pre10, %8 ], [ %4, %2 ]
  %16 = phi ptr [ %13, %8 ], [ %.pre, %2 ]
  %17 = add nsw i32 %15, 1
  store i32 %17, ptr %3, align 8, !tbaa !5
  %18 = sext i32 %15 to i64
  %19 = getelementptr inbounds i32, ptr %16, i64 %18
  store i32 %1, ptr %19, align 4, !tbaa !13
  ret void
}

; Function Attrs: mustprogress nounwind willreturn allockind("realloc") allocsize(1) memory(argmem: readwrite, inaccessiblemem: readwrite)
declare noalias noundef ptr @realloc(ptr allocptr nocapture noundef, i64 noundef) local_unnamed_addr #1

attributes #0 = { mustprogress nounwind willreturn 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 = { mustprogress nounwind willreturn allockind("realloc") allocsize(1) memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nounwind allocsize(1) }

!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 = !{!"", !7, i64 0, !10, i64 8, !10, i64 12}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 12}
!12 = !{!6, !7, i64 0}
!13 = !{!10, !10, i64 0}


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