; LLVM IR from Dev-XYS/Algorithms :: Cut-Vertex.ll (Z3geti)

; 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.vertex = type { i32, i32, i32, i8 }
%struct.edge = type { i32, i32 }

@V = external dso_local global [100000 x %struct.vertex], align 16
@E = external dso_local global [100000 x %struct.edge], align 16
@dfn = 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 @_Z3geti(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 0, ptr %3, align 4, !tbaa !5
  %5 = load i32, ptr @dfn, align 4, !tbaa !5
  %6 = add nsw i32 %5, 1
  store i32 %6, ptr @dfn, align 4, !tbaa !5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %8
  %10 = getelementptr inbounds %struct.vertex, ptr %9, i32 0, i32 2
  store i32 %5, ptr %10, align 8, !tbaa !9
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %12
  %14 = getelementptr inbounds %struct.vertex, ptr %13, i32 0, i32 1
  store i32 %5, ptr %14, align 4, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %16
  %18 = getelementptr inbounds %struct.vertex, ptr %17, i32 0, i32 0
  %19 = load i32, ptr %18, align 16, !tbaa !13
  store i32 %19, ptr %4, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %45, %1
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = icmp ne i32 %21, 0
  br i1 %22, label %24, label %23

23:                                               ; preds = %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %51

24:                                               ; preds = %20
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [100000 x %struct.edge], ptr @E, i64 0, i64 %26
  %28 = getelementptr inbounds %struct.edge, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %28, align 8, !tbaa !14
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %30
  %32 = getelementptr inbounds %struct.vertex, ptr %31, i32 0, i32 1
  %33 = load i32, ptr %32, align 4, !tbaa !12
  %34 = icmp eq i32 %33, 0
  br i1 %34, label %35, label %44

35:                                               ; preds = %24
  %36 = load i32, ptr %3, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %3, align 4, !tbaa !5
  %38 = load i32, ptr %4, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [100000 x %struct.edge], ptr @E, i64 0, i64 %39
  %41 = getelementptr inbounds %struct.edge, ptr %40, i32 0, i32 0
  %42 = load i32, ptr %41, align 8, !tbaa !14
  %43 = load i32, ptr %2, align 4, !tbaa !5
  call void @_Z3DFSii(i32 noundef %42, i32 noundef %43)
  br label %44

44:                                               ; preds = %35, %24
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %4, align 4, !tbaa !5
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds [100000 x %struct.edge], ptr @E, i64 0, i64 %47
  %49 = getelementptr inbounds %struct.edge, ptr %48, i32 0, i32 1
  %50 = load i32, ptr %49, align 4, !tbaa !16
  store i32 %50, ptr %4, align 4, !tbaa !5
  br label %20, !llvm.loop !17

51:                                               ; preds = %23
  %52 = load i32, ptr %3, align 4, !tbaa !5
  %53 = icmp sgt i32 %52, 1
  br i1 %53, label %54, label %59

54:                                               ; preds = %51
  %55 = load i32, ptr %2, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %56
  %58 = getelementptr inbounds %struct.vertex, ptr %57, i32 0, i32 3
  store i8 1, ptr %58, align 4, !tbaa !19
  br label %59

59:                                               ; preds = %54, %51
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #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 8}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4, !6, i64 8, !11, i64 12}
!11 = !{!"bool", !7, i64 0}
!12 = !{!10, !6, i64 4}
!13 = !{!10, !6, i64 0}
!14 = !{!15, !6, i64 0}
!15 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!16 = !{!15, !6, i64 4}
!17 = distinct !{!17, !18}
!18 = !{!"llvm.loop.mustprogress"}
!19 = !{!10, !11, i64 12}


; 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.vertex = type { i32, i32, i32, i8 }
%struct.edge = type { i32, i32 }

@V = external dso_local local_unnamed_addr global [100000 x %struct.vertex], align 16
@E = external dso_local local_unnamed_addr global [100000 x %struct.edge], align 16
@dfn = 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 @_Z3geti(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @dfn, align 4, !tbaa !5
  %3 = add nsw i32 %2, 1
  store i32 %3, ptr @dfn, align 4, !tbaa !5
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %4
  %6 = getelementptr inbounds i8, ptr %5, i64 8
  store i32 %2, ptr %6, align 8, !tbaa !9
  %7 = getelementptr inbounds i8, ptr %5, i64 4
  store i32 %2, ptr %7, align 4, !tbaa !12
  %.012 = load i32, ptr %5, align 16, !tbaa !5
  %.not13 = icmp eq i32 %.012, 0
  br i1 %.not13, label %._crit_edge.thread, label %.lr.ph

._crit_edge:                                      ; preds = %18
  %8 = icmp sgt i32 %.1, 1
  br i1 %8, label %20, label %._crit_edge.thread

.lr.ph:                                           ; preds = %1, %18
  %.015 = phi i32 [ %.0, %18 ], [ %.012, %1 ]
  %.01114 = phi i32 [ %.1, %18 ], [ 0, %1 ]
  %9 = sext i32 %.015 to i64
  %10 = getelementptr inbounds [100000 x %struct.edge], ptr @E, i64 0, i64 %9
  %11 = load i32, ptr %10, align 8, !tbaa !13
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [100000 x %struct.vertex], ptr @V, i64 0, i64 %12, i32 1
  %14 = load i32, ptr %13, align 4, !tbaa !12
  %15 = icmp eq i32 %14, 0
  br i1 %15, label %16, label %18

16:                                               ; preds = %.lr.ph
  %17 = add nsw i32 %.01114, 1
  tail call void @_Z3DFSii(i32 noundef %11, i32 noundef %0)
  br label %18

18:                                               ; preds = %.lr.ph, %16
  %.1 = phi i32 [ %17, %16 ], [ %.01114, %.lr.ph ]
  %19 = getelementptr inbounds i8, ptr %10, i64 4
  %.0 = load i32, ptr %19, align 4, !tbaa !5
  %.not = icmp eq i32 %.0, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !15

20:                                               ; preds = %._crit_edge
  %21 = getelementptr inbounds i8, ptr %5, i64 12
  store i8 1, ptr %21, align 4, !tbaa !17
  br label %._crit_edge.thread

._crit_edge.thread:                               ; preds = %1, %20, %._crit_edge
  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 8}
!10 = !{!"_ZTS6vertex", !6, i64 0, !6, i64 4, !6, i64 8, !11, i64 12}
!11 = !{!"bool", !7, i64 0}
!12 = !{!10, !6, i64 4}
!13 = !{!14, !6, i64 0}
!14 = !{!"_ZTS4edge", !6, i64 0, !6, i64 4}
!15 = distinct !{!15, !16}
!16 = !{!"llvm.loop.mustprogress"}
!17 = !{!10, !11, i64 12}


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