; LLVM IR from dmalyuta/FlyARocket_GNC :: msp430_funcs (MSP430_UART_write)

; 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"

@MSP430_UART = external dso_local global i32, align 4
@.str.1 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local void @MSP430_UART_receive() #0

declare void @perror(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @MSP430_UART_write(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %16, %1
  %5 = load i32, ptr @MSP430_UART, align 4, !tbaa !9
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = load i32, ptr %3, align 4, !tbaa !9
  %8 = sext i32 %7 to i64
  %9 = getelementptr inbounds i8, ptr %6, i64 %8
  %10 = call i64 @write(i32 noundef %5, ptr noundef %9, i64 noundef 1)
  %11 = icmp slt i64 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %4
  call void @perror(ptr noundef @.str.1)
  br label %13

13:                                               ; preds = %12, %4
  call void @MSP430_UART_receive()
  %14 = load i32, ptr %3, align 4, !tbaa !9
  %15 = add nsw i32 %14, 1
  store i32 %15, ptr %3, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %13
  %17 = load i32, ptr %3, align 4, !tbaa !9
  %18 = icmp slt i32 %17, 3
  br i1 %18, label %4, label %19, !llvm.loop !11

19:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

declare i64 @write(i32 noundef, ptr noundef, i64 noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = 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"

@MSP430_UART = external dso_local local_unnamed_addr global i32, align 4
@.str.1 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local void @MSP430_UART_receive() local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare void @perror(ptr nocapture noundef readonly) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @MSP430_UART_write(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @MSP430_UART, align 4, !tbaa !5
  %3 = tail call i64 @write(i32 noundef %2, ptr noundef %0, i64 noundef 1) #3
  %4 = icmp slt i64 %3, 0
  br i1 %4, label %5, label %6

5:                                                ; preds = %1
  tail call void @perror(ptr noundef nonnull @.str.1) #4
  br label %6

6:                                                ; preds = %5, %1
  tail call void @MSP430_UART_receive()
  %7 = load i32, ptr @MSP430_UART, align 4, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %0, i64 1
  %9 = tail call i64 @write(i32 noundef %7, ptr noundef nonnull %8, i64 noundef 1) #3
  %10 = icmp slt i64 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %6
  tail call void @perror(ptr noundef nonnull @.str.1) #4
  br label %12

12:                                               ; preds = %11, %6
  tail call void @MSP430_UART_receive()
  %13 = load i32, ptr @MSP430_UART, align 4, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %0, i64 2
  %15 = tail call i64 @write(i32 noundef %13, ptr noundef nonnull %14, i64 noundef 1) #3
  %16 = icmp slt i64 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %12
  tail call void @perror(ptr noundef nonnull @.str.1) #4
  br label %18

18:                                               ; preds = %17, %12
  tail call void @MSP430_UART_receive()
  ret void
}

; Function Attrs: nofree
declare noundef i64 @write(i32 noundef, ptr nocapture noundef readonly, i64 noundef) local_unnamed_addr #2

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 = { nofree nounwind "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 = { nofree "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 }
attributes #4 = { cold }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


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