; LLVM IR from AlgoGenesis/C :: Graph Algorithms/Kosaraju 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, [100 x [100 x i32]] }

@.str = external hidden unnamed_addr constant [4 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
define dso_local void @dfsT(i32 noundef %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !9
  %8 = load ptr, ptr %5, align 8, !tbaa !9
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds i8, ptr %8, i64 %10
  store i8 1, ptr %11, align 1, !tbaa !11
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %12)
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 1, ptr %7, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %44, %3
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = load ptr, ptr %6, align 8, !tbaa !9
  %17 = getelementptr inbounds %struct.Graph, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %17, align 4, !tbaa !13
  %19 = icmp slt i32 %15, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %47

21:                                               ; preds = %14
  %22 = load ptr, ptr %6, align 8, !tbaa !9
  %23 = getelementptr inbounds %struct.Graph, ptr %22, i32 0, i32 1
  %24 = load i32, ptr %4, align 4, !tbaa !5
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds [100 x [100 x i32]], ptr %23, i64 0, i64 %25
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [100 x i32], ptr %26, i64 0, i64 %28
  %30 = load i32, ptr %29, align 4, !tbaa !5
  %31 = icmp ne i32 %30, 0
  br i1 %31, label %32, label %43

32:                                               ; preds = %21
  %33 = load ptr, ptr %5, align 8, !tbaa !9
  %34 = load i32, ptr %7, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds i8, ptr %33, i64 %35
  %37 = load i8, ptr %36, align 1, !tbaa !11, !range !15, !noundef !16
  %38 = trunc i8 %37 to i1
  br i1 %38, label %43, label %39

39:                                               ; preds = %32
  %40 = load i32, ptr %7, align 4, !tbaa !5
  %41 = load ptr, ptr %5, align 8, !tbaa !9
  %42 = load ptr, ptr %6, align 8, !tbaa !9
  call void @dfsT(i32 noundef %40, ptr noundef %41, ptr noundef %42)
  br label %43

43:                                               ; preds = %39, %32, %21
  br label %44

44:                                               ; preds = %43
  %45 = load i32, ptr %7, align 4, !tbaa !5
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %7, align 4, !tbaa !5
  br label %14, !llvm.loop !17

47:                                               ; preds = %20
  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 = !{!"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, !12, i64 0}
!12 = !{!"_Bool", !7, i64 0}
!13 = !{!14, !6, i64 0}
!14 = !{!"", !6, i64 0, !7, i64 4}
!15 = !{i8 0, i8 2}
!16 = !{}
!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 [4 x i8], align 1

; Function Attrs: nofree nounwind uwtable
define dso_local void @dfsT(i32 noundef %0, ptr nocapture noundef %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds i8, ptr %1, i64 %4
  store i8 1, ptr %5, align 1, !tbaa !5
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %0)
  %7 = load i32, ptr %2, align 4, !tbaa !9
  %8 = icmp sgt i32 %7, 1
  br i1 %8, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3
  %9 = getelementptr inbounds i8, ptr %2, i64 4
  br label %10

._crit_edge:                                      ; preds = %20, %3
  ret void

10:                                               ; preds = %.lr.ph, %20
  %11 = phi i32 [ %7, %.lr.ph ], [ %21, %20 ]
  %indvars.iv = phi i64 [ 1, %.lr.ph ], [ %indvars.iv.next, %20 ]
  %12 = getelementptr inbounds [100 x [100 x i32]], ptr %9, i64 0, i64 %4, i64 %indvars.iv
  %13 = load i32, ptr %12, align 4, !tbaa !12
  %.not = icmp eq i32 %13, 0
  br i1 %.not, label %20, label %14

14:                                               ; preds = %10
  %15 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %16 = load i8, ptr %15, align 1, !tbaa !5, !range !13, !noundef !14
  %17 = trunc nuw i8 %16 to i1
  br i1 %17, label %20, label %18

18:                                               ; preds = %14
  %19 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @dfsT(i32 noundef %19, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %.pre = load i32, ptr %2, align 4, !tbaa !9
  br label %20

20:                                               ; preds = %10, %14, %18
  %21 = phi i32 [ %11, %10 ], [ %11, %14 ], [ %.pre, %18 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %22 = sext i32 %21 to i64
  %23 = icmp slt i64 %indvars.iv.next, %22
  br i1 %23, label %10, label %._crit_edge, !llvm.loop !15
}

; 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, !6, i64 0}
!6 = !{!"_Bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"", !11, i64 0, !7, i64 4}
!11 = !{!"int", !7, i64 0}
!12 = !{!11, !11, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}


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