; LLVM IR from AllenDowney/ExercisesInC :: exercises/web_server (wrapsock)

; 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"

@.str = external hidden unnamed_addr constant [13 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @Accept(i32 noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %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
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  br label %8

8:                                                ; preds = %22, %3
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = load ptr, ptr %5, align 8, !tbaa !9
  %11 = load ptr, ptr %6, align 8, !tbaa !9
  %12 = call i32 @accept(i32 noundef %9, ptr noundef %10, ptr noundef %11)
  store i32 %12, ptr %7, align 4, !tbaa !5
  %13 = icmp slt i32 %12, 0
  br i1 %13, label %14, label %25

14:                                               ; preds = %8
  %15 = call ptr @__errno_location() #5
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp eq i32 %16, 71
  br i1 %17, label %22, label %18

18:                                               ; preds = %14
  %19 = call ptr @__errno_location() #5
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = icmp eq i32 %20, 103
  br i1 %21, label %22, label %23

22:                                               ; preds = %18, %14
  br label %8

23:                                               ; preds = %18
  call void (ptr, ...) @err_sys(ptr noundef @.str)
  br label %24

24:                                               ; preds = %23
  br label %25

25:                                               ; preds = %24, %8
  %26 = load i32, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  ret i32 %26
}

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

declare i32 @accept(i32 noundef, ptr noundef, ptr noundef) #2

; Function Attrs: nounwind willreturn memory(none)
declare ptr @__errno_location() #3

declare void @err_sys(ptr noundef, ...) #2

; 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 = { "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 willreturn memory(none) "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 #4 = { nounwind }
attributes #5 = { nounwind willreturn memory(none) }

!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}


; 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 [13 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @Accept(i32 noundef %0, ptr noundef %1, ptr noundef %2) local_unnamed_addr #0 {
  %4 = tail call i32 @accept(i32 noundef %0, ptr noundef %1, ptr noundef %2) #3
  %5 = icmp slt i32 %4, 0
  br i1 %5, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %3
  %6 = tail call ptr @__errno_location() #4
  br label %7

7:                                                ; preds = %.lr.ph, %10
  %8 = phi i32 [ %4, %.lr.ph ], [ %11, %10 ]
  %9 = load i32, ptr %6, align 4, !tbaa !5
  switch i32 %9, label %13 [
    i32 71, label %10
    i32 103, label %10
  ]

10:                                               ; preds = %7, %7
  %11 = tail call i32 @accept(i32 noundef %0, ptr noundef %1, ptr noundef %2) #3
  %12 = icmp slt i32 %11, 0
  br i1 %12, label %7, label %.loopexit

13:                                               ; preds = %7
  tail call void (ptr, ...) @err_sys(ptr noundef nonnull @.str) #3
  br label %.loopexit

.loopexit:                                        ; preds = %10, %3, %13
  %14 = phi i32 [ %8, %13 ], [ %4, %3 ], [ %11, %10 ]
  ret i32 %14
}

declare i32 @accept(i32 noundef, ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(none)
declare ptr @__errno_location() local_unnamed_addr #2

declare void @err_sys(ptr noundef, ...) local_unnamed_addr #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 = { "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 = { mustprogress nofree nosync nounwind willreturn memory(none) "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 }
attributes #4 = { nounwind willreturn memory(none) }

!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"}


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