; LLVM IR from bartobri/data-structures-c :: linked-lists/dummy-head-reversal (main)

; 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 { i32, ptr }

@.str = external hidden unnamed_addr constant [4 x i8], align 1

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

7:                                                ; preds = %15, %0
  %8 = load i32, ptr %2, align 4, !tbaa !9
  %9 = icmp slt i32 %8, 10
  br i1 %9, label %10, label %18

10:                                               ; preds = %7
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = load i32, ptr %2, align 4, !tbaa !9
  %13 = call ptr @new_link(i32 noundef %12)
  %14 = call ptr @insert_after(ptr noundef %11, ptr noundef %13)
  store ptr %14, ptr %4, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %10
  %16 = load i32, ptr %2, align 4, !tbaa !9
  %17 = add nsw i32 %16, 1
  store i32 %17, ptr %2, align 4, !tbaa !9
  br label %7, !llvm.loop !11

18:                                               ; preds = %7
  %19 = load ptr, ptr %3, align 8, !tbaa !5
  %20 = getelementptr inbounds %struct.node, ptr %19, i32 0, i32 1
  %21 = load ptr, ptr %20, align 8, !tbaa !13
  %22 = call ptr @reverse(ptr noundef %21)
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.node, ptr %23, i32 0, i32 1
  store ptr %22, ptr %24, align 8, !tbaa !13
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.node, ptr %25, i32 0, i32 1
  %27 = load ptr, ptr %26, align 8, !tbaa !13
  store ptr %27, ptr %4, align 8, !tbaa !5
  br label %28

28:                                               ; preds = %36, %18
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = icmp ne ptr %29, null
  br i1 %30, label %31, label %40

31:                                               ; preds = %28
  %32 = load ptr, ptr %4, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.node, ptr %32, i32 0, i32 0
  %34 = load i32, ptr %33, align 8, !tbaa !15
  %35 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %34)
  br label %36

36:                                               ; preds = %31
  %37 = load ptr, ptr %4, align 8, !tbaa !5
  %38 = getelementptr inbounds %struct.node, ptr %37, i32 0, i32 1
  %39 = load ptr, ptr %38, align 8, !tbaa !13
  store ptr %39, ptr %4, align 8, !tbaa !5
  br label %28, !llvm.loop !16

40:                                               ; preds = %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  ret i32 0
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare ptr @new_link(i32 noundef) #2

declare ptr @insert_after(ptr noundef, ptr noundef) #2

; Function Attrs: nounwind uwtable
declare dso_local ptr @reverse(ptr noundef) #0

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !6, i64 8}
!14 = !{!"node", !10, i64 0, !6, i64 8}
!15 = !{!14, !10, i64 0}
!16 = distinct !{!16, !12}


; 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"

@.str = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call ptr @new_link(i32 noundef 0) #3
  %2 = tail call ptr @new_link(i32 noundef 0) #3
  %3 = tail call ptr @insert_after(ptr noundef %1, ptr noundef %2) #3
  %4 = tail call ptr @new_link(i32 noundef 1) #3
  %5 = tail call ptr @insert_after(ptr noundef %3, ptr noundef %4) #3
  %6 = tail call ptr @new_link(i32 noundef 2) #3
  %7 = tail call ptr @insert_after(ptr noundef %5, ptr noundef %6) #3
  %8 = tail call ptr @new_link(i32 noundef 3) #3
  %9 = tail call ptr @insert_after(ptr noundef %7, ptr noundef %8) #3
  %10 = tail call ptr @new_link(i32 noundef 4) #3
  %11 = tail call ptr @insert_after(ptr noundef %9, ptr noundef %10) #3
  %12 = tail call ptr @new_link(i32 noundef 5) #3
  %13 = tail call ptr @insert_after(ptr noundef %11, ptr noundef %12) #3
  %14 = tail call ptr @new_link(i32 noundef 6) #3
  %15 = tail call ptr @insert_after(ptr noundef %13, ptr noundef %14) #3
  %16 = tail call ptr @new_link(i32 noundef 7) #3
  %17 = tail call ptr @insert_after(ptr noundef %15, ptr noundef %16) #3
  %18 = tail call ptr @new_link(i32 noundef 8) #3
  %19 = tail call ptr @insert_after(ptr noundef %17, ptr noundef %18) #3
  %20 = tail call ptr @new_link(i32 noundef 9) #3
  %21 = tail call ptr @insert_after(ptr noundef %19, ptr noundef %20) #3
  %22 = getelementptr inbounds i8, ptr %1, i64 8
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  %24 = tail call ptr @reverse(ptr noundef %23)
  store ptr %24, ptr %22, align 8, !tbaa !5
  %.not13 = icmp eq ptr %24, null
  br i1 %.not13, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.114 = phi ptr [ %28, %.lr.ph ], [ %24, %0 ]
  %25 = load i32, ptr %.114, align 8, !tbaa !11
  %26 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %25)
  %27 = getelementptr inbounds i8, ptr %.114, i64 8
  %28 = load ptr, ptr %27, align 8, !tbaa !5
  %.not = icmp eq ptr %28, null
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret i32 0
}

declare ptr @new_link(i32 noundef) local_unnamed_addr #1

declare ptr @insert_after(ptr noundef, ptr noundef) local_unnamed_addr #1

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

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) 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 = { "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 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 #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, !10, i64 8}
!6 = !{!"node", !7, i64 0, !10, i64 8}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


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