; LLVM IR from openanolis/openssl :: doc/designs/ddd (ddd-04-fd-nonblocking)

; 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.app_conn_st = type { ptr, i32, i32, i32 }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

declare i32 @SSL_get_error(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @rx(ptr noundef %0, ptr noundef %1, i32 noundef %2) #2 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.app_conn_st, ptr %11, i32 0, i32 2
  store i32 0, ptr %12, align 4, !tbaa !11
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds %struct.app_conn_st, ptr %13, i32 0, i32 0
  %15 = load ptr, ptr %14, align 8, !tbaa !13
  %16 = load ptr, ptr %6, align 8, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = call i32 @SSL_read(ptr noundef %15, ptr noundef %16, i32 noundef %17)
  store i32 %18, ptr %9, align 4, !tbaa !9
  %19 = load i32, ptr %9, align 4, !tbaa !9
  %20 = icmp sle i32 %19, 0
  br i1 %20, label %21, label %33

21:                                               ; preds = %3
  %22 = load ptr, ptr %5, align 8, !tbaa !5
  %23 = getelementptr inbounds %struct.app_conn_st, ptr %22, i32 0, i32 0
  %24 = load ptr, ptr %23, align 8, !tbaa !13
  %25 = load i32, ptr %9, align 4, !tbaa !9
  %26 = call i32 @SSL_get_error(ptr noundef %24, i32 noundef %25)
  store i32 %26, ptr %8, align 4, !tbaa !9
  %27 = load i32, ptr %8, align 4, !tbaa !9
  switch i32 %27, label %32 [
    i32 3, label %28
    i32 2, label %31
  ]

28:                                               ; preds = %21
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.app_conn_st, ptr %29, i32 0, i32 2
  store i32 1, ptr %30, align 4, !tbaa !11
  br label %31

31:                                               ; preds = %28, %21
  store i32 -2, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %35

32:                                               ; preds = %21
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %35

33:                                               ; preds = %3
  %34 = load i32, ptr %9, align 4, !tbaa !9
  store i32 %34, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %35

35:                                               ; preds = %33, %32, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  %36 = load i32, ptr %4, align 4
  ret i32 %36
}

declare i32 @SSL_read(ptr noundef, ptr noundef, i32 noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 #3 = { 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, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 12}
!12 = !{!"app_conn_st", !6, i64 0, !10, i64 8, !10, i64 12, !10, i64 16}
!13 = !{!12, !6, 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"

declare i32 @SSL_get_error(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local range(i32 -2, -2147483648) i32 @rx(ptr nocapture noundef %0, ptr noundef %1, i32 noundef %2) local_unnamed_addr #1 {
  %4 = getelementptr inbounds i8, ptr %0, i64 12
  store i32 0, ptr %4, align 4, !tbaa !5
  %5 = load ptr, ptr %0, align 8, !tbaa !11
  %6 = tail call i32 @SSL_read(ptr noundef %5, ptr noundef %1, i32 noundef %2) #2
  %7 = icmp slt i32 %6, 1
  br i1 %7, label %8, label %13

8:                                                ; preds = %3
  %9 = load ptr, ptr %0, align 8, !tbaa !11
  %10 = tail call i32 @SSL_get_error(ptr noundef %9, i32 noundef %6) #2
  switch i32 %10, label %12 [
    i32 3, label %11
    i32 2, label %13
  ]

11:                                               ; preds = %8
  store i32 1, ptr %4, align 4, !tbaa !5
  br label %13

12:                                               ; preds = %8
  br label %13

13:                                               ; preds = %3, %8, %11, %12
  %.0 = phi i32 [ -1, %12 ], [ -2, %11 ], [ -2, %8 ], [ %6, %3 ]
  ret i32 %.0
}

declare i32 @SSL_read(ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #0

attributes #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 = { 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 #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, !10, i64 12}
!6 = !{!"app_conn_st", !7, i64 0, !10, i64 8, !10, i64 12, !10, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !7, i64 0}


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