; LLVM IR from VAR-solutions/Algorithms :: Graphs/Kosaraju ALgorithm/Kosaraju_ALgorithm.ll (Z10order_passv)

; 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.vertices_s = type { i32, i32, [5 x i32] }

@vertices = external dso_local global [12 x %struct.vertices_s], align 16
@num_vertices = external dso_local global i32, align 4

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsii(i32 noundef, i32 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z10order_passv() #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %2

2:                                                ; preds = %16, %0
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = load i32, ptr @num_vertices, align 4, !tbaa !5
  %5 = icmp slt i32 %3, %4
  br i1 %5, label %6, label %19

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [12 x %struct.vertices_s], ptr @vertices, i64 0, i64 %8
  %10 = getelementptr inbounds %struct.vertices_s, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 4, !tbaa !9
  %12 = icmp ne i32 %11, 0
  br i1 %12, label %15, label %13

13:                                               ; preds = %6
  %14 = load i32, ptr %1, align 4, !tbaa !5
  call void @_Z3dfsii(i32 noundef %14, i32 noundef -1)
  br label %15

15:                                               ; preds = %13, %6
  br label %16

16:                                               ; preds = %15
  %17 = load i32, ptr %1, align 4, !tbaa !5
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %1, align 4, !tbaa !5
  br label %2, !llvm.loop !11

19:                                               ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  ret void
}

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTS10vertices_s", !6, i64 0, !6, i64 4, !7, i64 8}
!11 = distinct !{!11, !12}
!12 = !{!"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"

%struct.vertices_s = type { i32, i32, [5 x i32] }

@vertices = external dso_local local_unnamed_addr global [12 x %struct.vertices_s], align 16
@num_vertices = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z3dfsii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z10order_passv() local_unnamed_addr #0 {
  %1 = load i32, ptr @num_vertices, align 4, !tbaa !5
  %2 = icmp sgt i32 %1, 0
  br i1 %2, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %8
  %3 = phi i32 [ %9, %8 ], [ %1, %0 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %8 ], [ 0, %0 ]
  %4 = getelementptr inbounds [12 x %struct.vertices_s], ptr @vertices, i64 0, i64 %indvars.iv
  %5 = load i32, ptr %4, align 4, !tbaa !9
  %.not = icmp eq i32 %5, 0
  br i1 %.not, label %6, label %8

6:                                                ; preds = %.lr.ph
  %7 = trunc nuw nsw i64 %indvars.iv to i32
  tail call void @_Z3dfsii(i32 noundef %7, i32 noundef -1)
  %.pre = load i32, ptr @num_vertices, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %.lr.ph, %6
  %9 = phi i32 [ %3, %.lr.ph ], [ %.pre, %6 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %10 = sext i32 %9 to i64
  %11 = icmp slt i64 %indvars.iv.next, %10
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %8, %0
  ret void
}

attributes #0 = { mustprogress 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" }

!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++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTS10vertices_s", !6, i64 0, !6, i64 4, !7, i64 8}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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