; 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 }

@.str = external hidden unnamed_addr constant [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
declare dso_local ptr @createStack(i32 noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @isEmpty(ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop(ptr noundef) #1

; Function Attrs: nounwind uwtable
declare dso_local void @topologicalSortUtil(ptr noundef, i32 noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @topologicalSort(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds %struct.Graph, ptr %5, i32 0, i32 0
  %7 = load i32, ptr %6, align 8, !tbaa !9
  %8 = call ptr @createStack(i32 noundef %7)
  store ptr %8, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !12
  br label %9

9:                                                ; preds = %30, %1
  %10 = load i32, ptr %4, align 4, !tbaa !12
  %11 = load ptr, ptr %2, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.Graph, ptr %11, i32 0, i32 0
  %13 = load i32, ptr %12, align 8, !tbaa !9
  %14 = icmp slt i32 %10, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  br label %33

16:                                               ; preds = %9
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.Graph, ptr %17, i32 0, i32 2
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  %20 = load i32, ptr %4, align 4, !tbaa !12
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !12
  %24 = icmp eq i32 %23, 0
  br i1 %24, label %25, label %29

25:                                               ; preds = %16
  %26 = load ptr, ptr %2, align 8, !tbaa !5
  %27 = load i32, ptr %4, align 4, !tbaa !12
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  call void @topologicalSortUtil(ptr noundef %26, i32 noundef %27, ptr noundef %28)
  br label %29

29:                                               ; preds = %25, %16
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %4, align 4, !tbaa !12
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %4, align 4, !tbaa !12
  br label %9, !llvm.loop !14

33:                                               ; preds = %15
  br label %34

34:                                               ; preds = %39, %33
  %35 = load ptr, ptr %3, align 8, !tbaa !5
  %36 = call i32 @isEmpty(ptr noundef %35)
  %37 = icmp ne i32 %36, 0
  %38 = xor i1 %37, true
  br i1 %38, label %39, label %43

39:                                               ; preds = %34
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = call i32 @pop(ptr noundef %40)
  %42 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %41)
  br label %34, !llvm.loop !16

43:                                               ; preds = %34
  %44 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

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, !11, i64 0}
!10 = !{!"Graph", !11, i64 0, !6, i64 8, !6, i64 16}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{!10, !6, i64 16}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = distinct !{!16, !15}


; 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 [4 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @createStack(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @isEmpty(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @pop(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local void @topologicalSortUtil(ptr noundef, i32 noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @topologicalSort(ptr noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr %0, align 8, !tbaa !5
  %3 = tail call ptr @createStack(i32 noundef %2)
  %4 = load i32, ptr %0, align 8, !tbaa !5
  %5 = icmp sgt i32 %4, 0
  br i1 %5, label %.lr.ph, label %.preheader

.lr.ph:                                           ; preds = %1
  %6 = getelementptr inbounds i8, ptr %0, i64 16
  br label %8

.preheader:                                       ; preds = %16, %1
  %7 = tail call i32 @isEmpty(ptr noundef %3)
  %.not11 = icmp eq i32 %7, 0
  br i1 %.not11, label %.lr.ph12, label %._crit_edge

8:                                                ; preds = %.lr.ph, %16
  %9 = phi i32 [ %4, %.lr.ph ], [ %17, %16 ]
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %16 ]
  %10 = load ptr, ptr %6, align 8, !tbaa !11
  %11 = getelementptr inbounds i32, ptr %10, i64 %indvars.iv
  %12 = load i32, ptr %11, align 4, !tbaa !12
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %16

14:                                               ; preds = %8
  %15 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @topologicalSortUtil(ptr noundef nonnull %0, i32 noundef %15, ptr noundef %3)
  %.pre = load i32, ptr %0, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %8, %14
  %17 = phi i32 [ %9, %8 ], [ %.pre, %14 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %18 = sext i32 %17 to i64
  %19 = icmp slt i64 %indvars.iv.next, %18
  br i1 %19, label %8, label %.preheader, !llvm.loop !13

.lr.ph12:                                         ; preds = %.preheader, %.lr.ph12
  %20 = tail call i32 @pop(ptr noundef %3)
  %21 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %20)
  %22 = tail call i32 @isEmpty(ptr noundef %3)
  %.not = icmp eq i32 %22, 0
  br i1 %.not, label %.lr.ph12, label %._crit_edge, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph12, %.preheader
  %23 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  ret void
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #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 = { 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, !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 16}
!12 = !{!7, !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass