; LLVM IR from DroneBridge/DroneBridge :: common (db_utils)

; 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.timeval = type { i64, i64 }

; Function Attrs: nounwind uwtable
define dso_local void @clear_socket_buffer(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca %struct.timeval, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr %3) #5
  %7 = getelementptr inbounds %struct.timeval, ptr %3, i32 0, i32 0
  store i64 0, ptr %7, align 8, !tbaa !9
  %8 = getelementptr inbounds %struct.timeval, ptr %3, i32 0, i32 1
  store i64 100, ptr %8, align 8, !tbaa !12
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = call i32 @setsockopt(i32 noundef %9, i32 noundef 1, i32 noundef 20, ptr noundef %3, i32 noundef 16) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  store i32 2048, ptr %4, align 4, !tbaa !5
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = zext i32 %11 to i64
  %13 = call ptr @llvm.stacksave.p0()
  store ptr %13, ptr %5, align 8
  %14 = alloca i8, i64 %12, align 16
  store i64 %12, ptr %6, align 8
  br label %15

15:                                               ; preds = %21, %1
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = call i64 @recv(i32 noundef %16, ptr noundef %14, i64 noundef %18, i32 noundef 0)
  %20 = icmp sgt i64 %19, 0
  br i1 %20, label %21, label %22

21:                                               ; preds = %15
  br label %15, !llvm.loop !13

22:                                               ; preds = %15
  %23 = getelementptr inbounds %struct.timeval, ptr %3, i32 0, i32 0
  store i64 0, ptr %23, align 8, !tbaa !9
  %24 = getelementptr inbounds %struct.timeval, ptr %3, i32 0, i32 1
  store i64 0, ptr %24, align 8, !tbaa !12
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = call i32 @setsockopt(i32 noundef %25, i32 noundef 1, i32 noundef 20, ptr noundef %3, i32 noundef 16) #5
  %27 = load ptr, ptr %5, align 8
  call void @llvm.stackrestore.p0(ptr %27)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 16, ptr %3) #5
  ret void
}

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

; Function Attrs: nounwind
declare i32 @setsockopt(i32 noundef, i32 noundef, i32 noundef, ptr noundef, i32 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

declare i64 @recv(i32 noundef, ptr noundef, i64 noundef, i32 noundef) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

; 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 "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 = { nocallback nofree nosync nounwind willreturn }
attributes #4 = { "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 #5 = { 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, !11, i64 0}
!10 = !{!"timeval", !11, i64 0, !11, i64 8}
!11 = !{!"long", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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.timeval = type { i64, i64 }

; Function Attrs: nounwind uwtable
define dso_local void @clear_socket_buffer(i32 noundef %0) local_unnamed_addr #0 {
  %2 = alloca %struct.timeval, align 8
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %2) #6
  store i64 0, ptr %2, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 8
  store i64 100, ptr %3, align 8, !tbaa !10
  %4 = call i32 @setsockopt(i32 noundef %0, i32 noundef 1, i32 noundef 20, ptr noundef nonnull %2, i32 noundef 16) #6
  %5 = call ptr @llvm.stacksave.p0()
  %6 = alloca [2048 x i8], align 16
  br label %7

7:                                                ; preds = %7, %1
  %8 = call i64 @recv(i32 noundef %0, ptr noundef nonnull %6, i64 noundef 2048, i32 noundef 0) #6
  %9 = icmp sgt i64 %8, 0
  br i1 %9, label %7, label %10, !llvm.loop !11

10:                                               ; preds = %7
  call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(16) %2, i8 0, i64 16, i1 false)
  %11 = call i32 @setsockopt(i32 noundef %0, i32 noundef 1, i32 noundef 20, ptr noundef nonnull %2, i32 noundef 16) #6
  call void @llvm.stackrestore.p0(ptr %5)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %2) #6
  ret void
}

; 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
declare i32 @setsockopt(i32 noundef, i32 noundef, i32 noundef, ptr noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

declare i64 @recv(i32 noundef, ptr noundef, i64 noundef, i32 noundef) local_unnamed_addr #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

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

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #5

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 "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 = { mustprogress nocallback nofree nosync nounwind willreturn }
attributes #4 = { "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 #5 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #6 = { 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 0}
!6 = !{!"timeval", !7, i64 0, !7, i64 8}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 8}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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