; LLVM IR from nevermosby/linux-bpf-learning :: tc (tc-xdp-statistics)

; 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.pair = type { i32, i32 }
%struct.xdp_md = type { i32, i32, i32, i32, i32, i32 }

; Function Attrs: nounwind uwtable
define dso_local i32 @track_rx(ptr noundef %0) #0 section "rx" {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca %struct.pair, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = getelementptr inbounds %struct.xdp_md, ptr %8, i32 0, i32 1
  %10 = load i32, ptr %9, align 4, !tbaa !9
  %11 = zext i32 %10 to i64
  %12 = inttoptr i64 %11 to ptr
  store ptr %12, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.xdp_md, ptr %13, i32 0, i32 0
  %15 = load i32, ptr %14, align 4, !tbaa !12
  %16 = zext i32 %15 to i64
  %17 = inttoptr i64 %16 to ptr
  store ptr %17, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %18 = load ptr, ptr %5, align 8, !tbaa !5
  %19 = load ptr, ptr %4, align 8, !tbaa !5
  %20 = call zeroext i1 @parse_ipv4(i1 noundef zeroext true, ptr noundef %18, ptr noundef %19, ptr noundef %6)
  br i1 %20, label %22, label %21

21:                                               ; preds = %1
  store i32 2, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %28

22:                                               ; preds = %1
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = ptrtoint ptr %23 to i64
  %26 = ptrtoint ptr %24 to i64
  %27 = sub i64 %25, %26
  call void @update_stats(i1 noundef zeroext true, ptr noundef %6, i64 noundef %27)
  store i32 2, ptr %2, align 4
  store i32 1, ptr %7, align 4
  br label %28

28:                                               ; preds = %22, %21
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %29 = load i32, ptr %2, align 4
  ret i32 %29
}

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

; Function Attrs: nounwind uwtable
declare hidden zeroext i1 @parse_ipv4(i1 noundef zeroext, ptr noundef, ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
declare hidden void @update_stats(i1 noundef zeroext, ptr noundef, i64 noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 4}
!10 = !{!"xdp_md", !11, i64 0, !11, i64 4, !11, i64 8, !11, i64 12, !11, i64 16, !11, i64 20}
!11 = !{!"int", !7, i64 0}
!12 = !{!10, !11, i64 0}


; 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.pair = type { i32, i32 }

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @track_rx(ptr nocapture noundef readonly %0) local_unnamed_addr #0 section "rx" {
  %2 = alloca %struct.pair, align 4
  %3 = getelementptr inbounds i8, ptr %0, i64 4
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = zext i32 %4 to i64
  %6 = inttoptr i64 %5 to ptr
  %7 = load i32, ptr %0, align 4, !tbaa !10
  %8 = zext i32 %7 to i64
  %9 = inttoptr i64 %8 to ptr
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #2
  %10 = call zeroext i1 @parse_ipv4(i1 noundef zeroext true, ptr noundef %9, ptr noundef %6, ptr noundef nonnull %2)
  br i1 %10, label %11, label %13

11:                                               ; preds = %1
  %12 = sub nsw i64 %5, %8
  call void @update_stats(i1 noundef zeroext true, ptr noundef nonnull %2, i64 noundef %12)
  br label %13

13:                                               ; preds = %1, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #2
  ret i32 2
}

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

; Function Attrs: nounwind uwtable
declare hidden zeroext i1 @parse_ipv4(i1 noundef zeroext, ptr noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden void @update_stats(i1 noundef zeroext, ptr noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { mustprogress 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, !7, i64 4}
!6 = !{!"xdp_md", !7, i64 0, !7, i64 4, !7, i64 8, !7, i64 12, !7, i64 16, !7, i64 20}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 0}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass