; LLVM IR from lfarcaro/ARINC653_ARMV7A_AM335X :: Hardware (uartStdio)

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

; Function Attrs: nounwind uwtable
declare dso_local void @UARTPutc(i8 noundef zeroext) #1

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

; Function Attrs: nounwind uwtable
define dso_local ptr @UARTGets(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i8, align 1
  %7 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %8, ptr %7, align 8, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = icmp ne ptr null, %9
  br i1 %10, label %11, label %37

11:                                               ; preds = %2
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %14, label %37

14:                                               ; preds = %11
  %15 = call zeroext i8 @UARTGetc()
  store i8 %15, ptr %6, align 1, !tbaa !11
  br label %16

16:                                               ; preds = %27, %14
  %17 = load i8, ptr %6, align 1, !tbaa !11
  %18 = zext i8 %17 to i32
  %19 = icmp ne i32 13, %18
  br i1 %19, label %20, label %25

20:                                               ; preds = %16
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = sub i32 %22, 1
  %24 = icmp ult i32 %21, %23
  br label %25

25:                                               ; preds = %20, %16
  %26 = phi i1 [ false, %16 ], [ %24, %20 ]
  br i1 %26, label %27, label %35

27:                                               ; preds = %25
  %28 = load i8, ptr %6, align 1, !tbaa !11
  call void @UARTPutc(i8 noundef zeroext %28)
  %29 = load i8, ptr %6, align 1, !tbaa !11
  %30 = load ptr, ptr %7, align 8, !tbaa !5
  %31 = getelementptr inbounds i8, ptr %30, i32 1
  store ptr %31, ptr %7, align 8, !tbaa !5
  store i8 %29, ptr %30, align 1, !tbaa !11
  %32 = call zeroext i8 @UARTGetc()
  store i8 %32, ptr %6, align 1, !tbaa !11
  %33 = load i32, ptr %5, align 4, !tbaa !9
  %34 = add i32 %33, 1
  store i32 %34, ptr %5, align 4, !tbaa !9
  br label %16, !llvm.loop !12

35:                                               ; preds = %25
  %36 = load ptr, ptr %7, align 8, !tbaa !5
  store i8 0, ptr %36, align 1, !tbaa !11
  br label %37

37:                                               ; preds = %35, %11, %2
  %38 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret ptr %38
}

; Function Attrs: nounwind uwtable
declare dso_local zeroext i8 @UARTGetc() #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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, !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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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 void @UARTPutc(i8 noundef zeroext) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef ptr @UARTGets(ptr noundef returned writeonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp ne ptr %0, null
  %4 = icmp sgt i32 %1, 0
  %or.cond = and i1 %3, %4
  br i1 %or.cond, label %5, label %17

5:                                                ; preds = %2
  %6 = tail call zeroext i8 @UARTGetc()
  %7 = add nsw i32 %1, -1
  %8 = icmp ne i8 %6, 13
  %9 = icmp ne i32 %7, 0
  %10 = select i1 %8, i1 %9, i1 false
  br i1 %10, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %5, %.lr.ph
  %.018 = phi ptr [ %11, %.lr.ph ], [ %0, %5 ]
  %.01217 = phi i8 [ %12, %.lr.ph ], [ %6, %5 ]
  %.01316 = phi i32 [ %13, %.lr.ph ], [ 0, %5 ]
  tail call void @UARTPutc(i8 noundef zeroext %.01217)
  %11 = getelementptr inbounds i8, ptr %.018, i64 1
  store i8 %.01217, ptr %.018, align 1, !tbaa !5
  %12 = tail call zeroext i8 @UARTGetc()
  %13 = add nuw nsw i32 %.01316, 1
  %14 = icmp ne i8 %12, 13
  %15 = icmp ult i32 %13, %7
  %16 = select i1 %14, i1 %15, i1 false
  br i1 %16, label %.lr.ph, label %._crit_edge, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %5
  %.0.lcssa = phi ptr [ %0, %5 ], [ %11, %.lr.ph ]
  store i8 0, ptr %.0.lcssa, align 1, !tbaa !5
  br label %17

17:                                               ; preds = %._crit_edge, %2
  ret ptr %0
}

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

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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