; LLVM IR from marcinbor85/microshell :: src/src (ush_read_char)

; 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.ush_object = type { ptr, i32, i32, i32, ptr, i64, i64, i32, i64, i64, i64, i8, ptr, ptr, ptr, %struct.ush_node_object, ptr, ptr, ptr, i64, i64, ptr, i64, i32, i32, ptr, ptr, ptr, i64, i64, i64 }
%struct.ush_node_object = type { ptr, i64, ptr, ptr, ptr, ptr }
%struct.ush_descriptor = type { ptr, ptr, i64, ptr, i64, i64, ptr, ptr }
%struct.ush_io_interface = type { ptr, ptr }

@.str = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @ush_read_char(ptr noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  %4 = alloca i8, align 1
  %5 = alloca i8, align 1
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #3
  store i8 1, ptr %5, align 1, !tbaa !9
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  %8 = getelementptr inbounds %struct.ush_object, ptr %7, i32 0, i32 0
  %9 = load ptr, ptr %8, align 8, !tbaa !11
  %10 = getelementptr inbounds %struct.ush_descriptor, ptr %9, i32 0, i32 0
  %11 = load ptr, ptr %10, align 8, !tbaa !16
  %12 = getelementptr inbounds %struct.ush_io_interface, ptr %11, i32 0, i32 0
  %13 = load ptr, ptr %12, align 8, !tbaa !18
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = call i32 %13(ptr noundef %14, ptr noundef %4)
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %1
  store i1 false, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %63

18:                                               ; preds = %1
  %19 = load i8, ptr %4, align 1, !tbaa !20
  %20 = sext i8 %19 to i32
  switch i32 %20, label %49 [
    i32 3, label %21
    i32 8, label %23
    i32 127, label %23
    i32 9, label %44
    i32 27, label %46
  ]

21:                                               ; preds = %18
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  call void @ush_write_pointer(ptr noundef %22, ptr noundef @.str, i32 noundef 0)
  store i8 0, ptr %5, align 1, !tbaa !9
  br label %54

23:                                               ; preds = %18, %18
  %24 = load ptr, ptr %3, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.ush_object, ptr %24, i32 0, i32 8
  %26 = load i64, ptr %25, align 8, !tbaa !21
  %27 = icmp ugt i64 %26, 0
  br i1 %27, label %28, label %42

28:                                               ; preds = %23
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = getelementptr inbounds %struct.ush_object, ptr %29, i32 0, i32 8
  %31 = load i64, ptr %30, align 8, !tbaa !21
  %32 = add i64 %31, -1
  store i64 %32, ptr %30, align 8, !tbaa !21
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = getelementptr inbounds %struct.ush_object, ptr %33, i32 0, i32 0
  %35 = load ptr, ptr %34, align 8, !tbaa !11
  %36 = getelementptr inbounds %struct.ush_descriptor, ptr %35, i32 0, i32 1
  %37 = load ptr, ptr %36, align 8, !tbaa !22
  %38 = load ptr, ptr %3, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.ush_object, ptr %38, i32 0, i32 8
  %40 = load i64, ptr %39, align 8, !tbaa !21
  %41 = getelementptr inbounds i8, ptr %37, i64 %40
  store i8 0, ptr %41, align 1, !tbaa !20
  br label %43

42:                                               ; preds = %23
  store i8 0, ptr %5, align 1, !tbaa !9
  br label %43

43:                                               ; preds = %42, %28
  br label %54

44:                                               ; preds = %18
  %45 = load ptr, ptr %3, align 8, !tbaa !5
  call void @ush_autocomp_start(ptr noundef %45)
  store i8 0, ptr %5, align 1, !tbaa !9
  br label %54

46:                                               ; preds = %18
  %47 = load ptr, ptr %3, align 8, !tbaa !5
  %48 = getelementptr inbounds %struct.ush_object, ptr %47, i32 0, i32 7
  store i32 1, ptr %48, align 8, !tbaa !23
  store i8 0, ptr %5, align 1, !tbaa !9
  br label %54

49:                                               ; preds = %18
  %50 = load ptr, ptr %3, align 8, !tbaa !5
  %51 = load i8, ptr %4, align 1, !tbaa !20
  %52 = call zeroext i1 @ush_read_char_by_escape_state(ptr noundef %50, i8 noundef signext %51)
  %53 = zext i1 %52 to i8
  store i8 %53, ptr %5, align 1, !tbaa !9
  br label %54

54:                                               ; preds = %49, %46, %44, %43, %21
  %55 = load i8, ptr %5, align 1, !tbaa !9, !range !24, !noundef !25
  %56 = trunc i8 %55 to i1
  %57 = zext i1 %56 to i32
  %58 = icmp ne i32 %57, 0
  br i1 %58, label %59, label %62

59:                                               ; preds = %54
  %60 = load ptr, ptr %3, align 8, !tbaa !5
  %61 = load i8, ptr %4, align 1, !tbaa !20
  call void @ush_read_echo_service(ptr noundef %60, i8 noundef signext %61)
  br label %62

62:                                               ; preds = %59, %54
  store i1 true, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %63

63:                                               ; preds = %62, %17
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %4) #3
  %64 = load i1, ptr %2, align 1
  ret i1 %64
}

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

declare void @ush_write_pointer(ptr noundef, ptr noundef, i32 noundef) #2

declare void @ush_autocomp_start(ptr noundef) #2

declare zeroext i1 @ush_read_char_by_escape_state(ptr noundef, i8 noundef signext) #2

declare void @ush_read_echo_service(ptr noundef, i8 noundef signext) #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 }

!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 = !{!"_Bool", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"ush_object", !6, i64 0, !13, i64 8, !13, i64 12, !13, i64 16, !6, i64 24, !14, i64 32, !14, i64 40, !13, i64 48, !14, i64 56, !14, i64 64, !14, i64 72, !10, i64 80, !6, i64 88, !6, i64 96, !6, i64 104, !15, i64 112, !6, i64 160, !6, i64 168, !6, i64 176, !14, i64 184, !14, i64 192, !6, i64 200, !14, i64 208, !13, i64 216, !13, i64 220, !6, i64 224, !6, i64 232, !6, i64 240, !14, i64 248, !14, i64 256, !14, i64 264}
!13 = !{!"int", !7, i64 0}
!14 = !{!"long", !7, i64 0}
!15 = !{!"ush_node_object", !6, i64 0, !14, i64 8, !6, i64 16, !6, i64 24, !6, i64 32, !6, i64 40}
!16 = !{!17, !6, i64 0}
!17 = !{!"ush_descriptor", !6, i64 0, !6, i64 8, !14, i64 16, !6, i64 24, !14, i64 32, !14, i64 40, !6, i64 48, !6, i64 56}
!18 = !{!19, !6, i64 0}
!19 = !{!"ush_io_interface", !6, i64 0, !6, i64 8}
!20 = !{!7, !7, i64 0}
!21 = !{!12, !14, i64 56}
!22 = !{!17, !6, i64 8}
!23 = !{!12, !13, i64 48}
!24 = !{i8 0, i8 2}
!25 = !{}


; 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 [3 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local noundef zeroext i1 @ush_read_char(ptr noundef %0) local_unnamed_addr #0 {
  %2 = alloca i8, align 1
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %2) #3
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !14
  %5 = load ptr, ptr %4, align 8, !tbaa !16
  %6 = call i32 %5(ptr noundef nonnull %0, ptr noundef nonnull %2) #3
  %7 = icmp ne i32 %6, 0
  br i1 %7, label %8, label %.critedge

8:                                                ; preds = %1
  %9 = load i8, ptr %2, align 1, !tbaa !18
  switch i8 %9, label %22 [
    i8 3, label %10
    i8 8, label %11
    i8 127, label %11
    i8 9, label %19
    i8 27, label %20
  ]

10:                                               ; preds = %8
  call void @ush_write_pointer(ptr noundef nonnull %0, ptr noundef nonnull @.str, i32 noundef 0) #3
  br label %.critedge

11:                                               ; preds = %8, %8
  %12 = getelementptr inbounds i8, ptr %0, i64 56
  %13 = load i64, ptr %12, align 8, !tbaa !19
  %.not = icmp eq i64 %13, 0
  br i1 %.not, label %.critedge, label %.critedge15

.critedge15:                                      ; preds = %11
  %14 = add i64 %13, -1
  store i64 %14, ptr %12, align 8, !tbaa !19
  %15 = load ptr, ptr %0, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i64 8
  %17 = load ptr, ptr %16, align 8, !tbaa !20
  %18 = getelementptr inbounds i8, ptr %17, i64 %14
  store i8 0, ptr %18, align 1, !tbaa !18
  br label %24

19:                                               ; preds = %8
  call void @ush_autocomp_start(ptr noundef nonnull %0) #3
  br label %.critedge

20:                                               ; preds = %8
  %21 = getelementptr inbounds i8, ptr %0, i64 48
  store i32 1, ptr %21, align 8, !tbaa !21
  br label %.critedge

22:                                               ; preds = %8
  %23 = call zeroext i1 @ush_read_char_by_escape_state(ptr noundef nonnull %0, i8 noundef signext %9) #3
  br i1 %23, label %24, label %.critedge

24:                                               ; preds = %.critedge15, %22
  %25 = load i8, ptr %2, align 1, !tbaa !18
  call void @ush_read_echo_service(ptr noundef nonnull %0, i8 noundef signext %25) #3
  br label %.critedge

.critedge:                                        ; preds = %22, %24, %11, %10, %19, %20, %1
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %2) #3
  ret i1 %7
}

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

declare void @ush_write_pointer(ptr noundef, ptr noundef, i32 noundef) local_unnamed_addr #2

declare void @ush_autocomp_start(ptr noundef) local_unnamed_addr #2

declare zeroext i1 @ush_read_char_by_escape_state(ptr noundef, i8 noundef signext) local_unnamed_addr #2

declare void @ush_read_echo_service(ptr noundef, i8 noundef signext) local_unnamed_addr #2

; 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 = { "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, !7, i64 0}
!6 = !{!"ush_object", !7, i64 0, !10, i64 8, !10, i64 12, !10, i64 16, !7, i64 24, !11, i64 32, !11, i64 40, !10, i64 48, !11, i64 56, !11, i64 64, !11, i64 72, !12, i64 80, !7, i64 88, !7, i64 96, !7, i64 104, !13, i64 112, !7, i64 160, !7, i64 168, !7, i64 176, !11, i64 184, !11, i64 192, !7, i64 200, !11, i64 208, !10, i64 216, !10, i64 220, !7, i64 224, !7, i64 232, !7, i64 240, !11, i64 248, !11, i64 256, !11, i64 264}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!"long", !8, i64 0}
!12 = !{!"_Bool", !8, i64 0}
!13 = !{!"ush_node_object", !7, i64 0, !11, i64 8, !7, i64 16, !7, i64 24, !7, i64 32, !7, i64 40}
!14 = !{!15, !7, i64 0}
!15 = !{!"ush_descriptor", !7, i64 0, !7, i64 8, !11, i64 16, !7, i64 24, !11, i64 32, !11, i64 40, !7, i64 48, !7, i64 56}
!16 = !{!17, !7, i64 0}
!17 = !{!"ush_io_interface", !7, i64 0, !7, i64 8}
!18 = !{!8, !8, i64 0}
!19 = !{!6, !11, i64 56}
!20 = !{!15, !7, i64 8}
!21 = !{!6, !10, i64 48}


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