; LLVM IR from devicehive/esp8266-firmware :: firmware-src/sources (dhterminal_commands)

; 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

declare void @dh_uart_send_line(ptr noundef) #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 void @dhterminal_commands_history(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %4 = call ptr @dhterminal_get_history()
  store ptr %4, ptr %3, align 8, !tbaa !5
  br label %5

5:                                                ; preds = %17, %1
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = load i8, ptr %6, align 1, !tbaa !9
  %8 = icmp ne i8 %7, 0
  br i1 %8, label %9, label %18

9:                                                ; preds = %5
  %10 = load ptr, ptr %3, align 8, !tbaa !5
  call void @dh_uart_send_line(ptr noundef %10)
  br label %11

11:                                               ; preds = %16, %9
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = getelementptr inbounds i8, ptr %12, i32 1
  store ptr %13, ptr %3, align 8, !tbaa !5
  %14 = load i8, ptr %12, align 1, !tbaa !9
  %15 = icmp ne i8 %14, 0
  br i1 %15, label %16, label %17

16:                                               ; preds = %11
  br label %11, !llvm.loop !10

17:                                               ; preds = %11
  br label %5, !llvm.loop !12

18:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret void
}

declare ptr @dhterminal_get_history() #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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; 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 void @dh_uart_send_line(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @dhterminal_commands_history(ptr nocapture noundef readnone %0) local_unnamed_addr #1 {
  %2 = tail call ptr @dhterminal_get_history() #2
  %3 = load i8, ptr %2, align 1, !tbaa !5
  %.not4 = icmp eq i8 %3, 0
  br i1 %.not4, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %7
  %.05 = phi ptr [ %5, %7 ], [ %2, %1 ]
  tail call void @dh_uart_send_line(ptr noundef nonnull %.05) #2
  br label %4

4:                                                ; preds = %4, %.lr.ph
  %.1 = phi ptr [ %.05, %.lr.ph ], [ %5, %4 ]
  %5 = getelementptr inbounds i8, ptr %.1, i64 1
  %6 = load i8, ptr %.1, align 1, !tbaa !5
  %.not3 = icmp eq i8 %6, 0
  br i1 %.not3, label %7, label %4, !llvm.loop !8

7:                                                ; preds = %4
  %8 = load i8, ptr %5, align 1, !tbaa !5
  %.not = icmp eq i8 %8, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !10

._crit_edge:                                      ; preds = %7, %1
  ret void
}

declare ptr @dhterminal_get_history() 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, !6, i64 0}
!6 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = distinct !{!10, !9}


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