; LLVM IR from lfarcaro/ARINC653_ARMV7A_AM335X :: ARINC653_PORT (console)

; 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"

; Function Attrs: nounwind uwtable
declare dso_local zeroext i8 @CONSOLE_READ_BYTE(ptr noundef) #0

; Function Attrs: nounwind uwtable
define dso_local zeroext i8 @CONSOLE_READ_BYTE_COUNTOUT(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca i8, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %22, %2
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = call zeroext i8 @CONSOLE_READ_BYTE(ptr noundef %7)
  %9 = icmp ne i8 %8, 0
  %10 = xor i1 %9, true
  br i1 %10, label %11, label %23

11:                                               ; preds = %6
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp eq i32 %12, 0
  br i1 %13, label %14, label %15

14:                                               ; preds = %11
  store i8 0, ptr %3, align 1
  br label %24

15:                                               ; preds = %11
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = icmp ne i32 %16, -1
  br i1 %17, label %18, label %21

18:                                               ; preds = %15
  %19 = load i32, ptr %5, align 4, !tbaa !9
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr %5, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %18, %15
  br label %22

22:                                               ; preds = %21
  br label %6, !llvm.loop !11

23:                                               ; preds = %6
  store i8 1, ptr %3, align 1
  br label %24

24:                                               ; preds = %23, %14
  %25 = load i8, ptr %3, align 1
  ret i8 %25
}

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" }

!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 = distinct !{!11, !12}
!12 = !{!"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"

; Function Attrs: nounwind uwtable
declare dso_local zeroext i8 @CONSOLE_READ_BYTE(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local zeroext range(i8 0, 2) i8 @CONSOLE_READ_BYTE_COUNTOUT(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call zeroext i8 @CONSOLE_READ_BYTE(ptr noundef %0)
  %.not6 = icmp eq i8 %3, 0
  br i1 %.not6, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %6
  %.07 = phi i32 [ %.1, %6 ], [ %1, %2 ]
  switch i32 %.07, label %4 [
    i32 0, label %._crit_edge
    i32 -1, label %6
  ]

4:                                                ; preds = %.lr.ph
  %5 = add nsw i32 %.07, -1
  br label %6

6:                                                ; preds = %.lr.ph, %4
  %.1 = phi i32 [ %5, %4 ], [ %.07, %.lr.ph ]
  %7 = tail call zeroext i8 @CONSOLE_READ_BYTE(ptr noundef %0)
  %.not = icmp eq i8 %7, 0
  br i1 %.not, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %6, %2
  %.04 = phi i8 [ 1, %2 ], [ 1, %6 ], [ 0, %.lr.ph ]
  ret i8 %.04
}

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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass