; LLVM IR from freddiev4/dailyprogrammerchallenges :: Intermediate Challenges/Challenge 0219 Intermediate - To-do list (Part 2) (file)

; 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.node = type { ptr, ptr, ptr, ptr }

@first = external dso_local global ptr, align 8
@.str.33 = external hidden unnamed_addr constant [21 x i8], align 1
@.str.35 = external hidden unnamed_addr constant [2 x i8], align 1

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

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

declare noalias ptr @fopen(ptr noundef, ptr noundef) #1

declare i32 @fclose(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local void @write_to_file() #2 {
  %1 = alloca ptr, align 8
  %2 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #4
  %3 = call i32 @remove(ptr noundef @.str.33) #4
  %4 = call noalias ptr @fopen(ptr noundef @.str.33, ptr noundef @.str.35)
  store ptr %4, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr @first, align 8, !tbaa !5
  store ptr %5, ptr %1, align 8, !tbaa !5
  br label %6

6:                                                ; preds = %24, %0
  %7 = load ptr, ptr %1, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %28

9:                                                ; preds = %6
  %10 = load ptr, ptr %1, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.node, ptr %10, i32 0, i32 0
  %12 = load ptr, ptr %11, align 8, !tbaa !9
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = call i32 @fputs(ptr noundef %12, ptr noundef %13)
  %15 = load ptr, ptr %2, align 8, !tbaa !5
  %16 = call i32 @fputc(i32 noundef 10, ptr noundef %15)
  %17 = load ptr, ptr %1, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.node, ptr %17, i32 0, i32 1
  %19 = load ptr, ptr %18, align 8, !tbaa !11
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = call i32 @fputs(ptr noundef %19, ptr noundef %20)
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = call i32 @fputc(i32 noundef 10, ptr noundef %22)
  br label %24

24:                                               ; preds = %9
  %25 = load ptr, ptr %1, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.node, ptr %25, i32 0, i32 2
  %27 = load ptr, ptr %26, align 8, !tbaa !12
  store ptr %27, ptr %1, align 8, !tbaa !5
  br label %6, !llvm.loop !13

28:                                               ; preds = %6
  %29 = load ptr, ptr %2, align 8, !tbaa !5
  %30 = call i32 @fclose(ptr noundef %29)
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #4
  ret void
}

; Function Attrs: nounwind
declare i32 @remove(ptr noundef) #3

declare i32 @fputs(ptr noundef, ptr noundef) #1

declare i32 @fputc(i32 noundef, ptr noundef) #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 "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 #4 = { 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, !6, i64 0}
!10 = !{!"node", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!10, !6, i64 8}
!12 = !{!10, !6, i64 16}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@first = external dso_local local_unnamed_addr global ptr, align 8
@.str.33 = external hidden unnamed_addr constant [21 x i8], align 1
@.str.35 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nofree nounwind
declare noalias noundef ptr @fopen(ptr nocapture noundef readonly, ptr nocapture noundef readonly) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @fclose(ptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local void @write_to_file() local_unnamed_addr #1 {
  %1 = tail call i32 @remove(ptr noundef nonnull @.str.33) #2
  %2 = tail call noalias ptr @fopen(ptr noundef nonnull @.str.33, ptr noundef nonnull @.str.35)
  %.09 = load ptr, ptr @first, align 8, !tbaa !5
  %.not10 = icmp eq ptr %.09, null
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.011 = phi ptr [ %.0, %.lr.ph ], [ %.09, %0 ]
  %3 = load ptr, ptr %.011, align 8, !tbaa !9
  %4 = tail call i32 @fputs(ptr noundef %3, ptr noundef %2)
  %5 = tail call i32 @fputc(i32 noundef 10, ptr noundef %2)
  %6 = getelementptr inbounds i8, ptr %.011, i64 8
  %7 = load ptr, ptr %6, align 8, !tbaa !11
  %8 = tail call i32 @fputs(ptr noundef %7, ptr noundef %2)
  %9 = tail call i32 @fputc(i32 noundef 10, ptr noundef %2)
  %10 = getelementptr inbounds i8, ptr %.011, i64 16
  %.0 = load ptr, ptr %10, align 8, !tbaa !5
  %.not = icmp eq ptr %.0, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %0
  %11 = tail call i32 @fclose(ptr noundef %2)
  ret void
}

; Function Attrs: nofree nounwind
declare noundef i32 @remove(ptr nocapture noundef readonly) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @fputs(ptr nocapture noundef readonly, ptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @fputc(i32 noundef, ptr nocapture noundef) local_unnamed_addr #0

attributes #0 = { 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 #1 = { nofree 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, !6, i64 0}
!10 = !{!"node", !6, i64 0, !6, i64 8, !6, i64 16, !6, i64 24}
!11 = !{!10, !6, i64 8}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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