; LLVM IR from AlgoGenesis/C :: Graph Algorithms/Topological Sort Algorithm (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.Graph = 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: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #1

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

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

21:                                               ; preds = %39, %1
  %22 = load i32, ptr %4, align 4, !tbaa !5
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %42

26:                                               ; preds = %21
  %27 = load ptr, ptr %3, align 8, !tbaa !9
  %28 = getelementptr inbounds %struct.Graph, ptr %27, i32 0, i32 1
  %29 = load ptr, ptr %28, align 8, !tbaa !13
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds ptr, ptr %29, i64 %31
  store ptr null, ptr %32, align 8, !tbaa !9
  %33 = load ptr, ptr %3, align 8, !tbaa !9
  %34 = getelementptr inbounds %struct.Graph, ptr %33, i32 0, i32 2
  %35 = load ptr, ptr %34, align 8, !tbaa !14
  %36 = load i32, ptr %4, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i32, ptr %35, i64 %37
  store i32 0, ptr %38, align 4, !tbaa !5
  br label %39

39:                                               ; preds = %26
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %4, align 4, !tbaa !5
  br label %21, !llvm.loop !15

42:                                               ; preds = %25
  %43 = load ptr, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret ptr %43
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind allocsize(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 = { 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 }
attributes #4 = { nounwind allocsize(0) }

!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 = !{!"Graph", !6, i64 0, !10, i64 8, !10, i64 16}
!13 = !{!12, !10, i64 8}
!14 = !{!12, !10, i64 16}
!15 = distinct !{!15, !16}
!16 = !{!"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"

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nofree nounwind willreturn memory(write, argmem: none, inaccessiblemem: readwrite) uwtable
define dso_local noalias noundef ptr @createGraph(i32 noundef %0) local_unnamed_addr #1 {
  %2 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #3
  store i32 %0, ptr %2, align 8, !tbaa !5
  %3 = sext i32 %0 to i64
  %4 = shl nsw i64 %3, 3
  %5 = tail call noalias ptr @malloc(i64 noundef %4) #3
  %6 = getelementptr inbounds i8, ptr %2, i64 8
  store ptr %5, ptr %6, align 8, !tbaa !11
  %7 = shl nsw i64 %3, 2
  %8 = tail call noalias ptr @malloc(i64 noundef %7) #3
  %9 = getelementptr inbounds i8, ptr %2, i64 16
  store ptr %8, ptr %9, align 8, !tbaa !12
  %10 = icmp sgt i32 %0, 0
  br i1 %10, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %11 = zext nneg i32 %0 to i64
  %12 = shl nuw nsw i64 %11, 3
  tail call void @llvm.memset.p0.i64(ptr align 8 %5, i8 0, i64 %12, i1 false), !tbaa !13
  %13 = shl nuw nsw i64 %11, 2
  tail call void @llvm.memset.p0.i64(ptr align 4 %8, i8 0, i64 %13, i1 false), !tbaa !14
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.preheader, %1
  ret ptr %2
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

attributes #0 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(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 #1 = { mustprogress nofree nounwind willreturn memory(write, argmem: none, inaccessiblemem: readwrite) 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 nounwind willreturn memory(argmem: write) }
attributes #3 = { nounwind allocsize(0) }

!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 = !{!"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 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 16}
!13 = !{!10, !10, i64 0}
!14 = !{!7, !7, i64 0}


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