; LLVM IR from begeekmyfriend/leetcode :: 0051_n_queens (n_queens)

; 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"

@.str = external hidden unnamed_addr constant [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [20 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @solveNQueens(i32 noundef, ptr noundef, ptr noundef) #0

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

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

; Function Attrs: nounwind uwtable
define dso_local i32 @main(i32 noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca ptr, align 8
  %12 = alloca ptr, align 8
  %13 = alloca ptr, align 8
  %14 = alloca ptr, align 8
  store i32 0, ptr %3, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #6
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = icmp ne i32 %15, 2
  br i1 %16, label %17, label %19

17:                                               ; preds = %2
  %18 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  call void @exit(i32 noundef -1) #7
  unreachable

19:                                               ; preds = %2
  %20 = load ptr, ptr %5, align 8, !tbaa !9
  %21 = getelementptr inbounds ptr, ptr %20, i64 1
  %22 = load ptr, ptr %21, align 8, !tbaa !9
  %23 = call i32 @atoi(ptr noundef %22) #8
  store i32 %23, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %11) #6
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #6
  %24 = load i32, ptr %7, align 4, !tbaa !5
  %25 = call ptr @solveNQueens(i32 noundef %24, ptr noundef %10, ptr noundef %11)
  store ptr %25, ptr %12, align 8, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %70, %19
  %27 = load i32, ptr %6, align 4, !tbaa !5
  %28 = load i32, ptr %10, align 4, !tbaa !5
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %30, label %73

30:                                               ; preds = %26
  call void @llvm.lifetime.start.p0(i64 8, ptr %13) #6
  %31 = load ptr, ptr %12, align 8, !tbaa !9
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds ptr, ptr %31, i64 %33
  %35 = load ptr, ptr %34, align 8, !tbaa !9
  store ptr %35, ptr %13, align 8, !tbaa !9
  store i32 0, ptr %8, align 4, !tbaa !5
  br label %36

36:                                               ; preds = %63, %30
  %37 = load i32, ptr %8, align 4, !tbaa !5
  %38 = load i32, ptr %7, align 4, !tbaa !5
  %39 = icmp slt i32 %37, %38
  br i1 %39, label %40, label %66

40:                                               ; preds = %36
  call void @llvm.lifetime.start.p0(i64 8, ptr %14) #6
  %41 = load ptr, ptr %13, align 8, !tbaa !9
  %42 = load i32, ptr %8, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds ptr, ptr %41, i64 %43
  %45 = load ptr, ptr %44, align 8, !tbaa !9
  store ptr %45, ptr %14, align 8, !tbaa !9
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %46

46:                                               ; preds = %58, %40
  %47 = load i32, ptr %9, align 4, !tbaa !5
  %48 = load i32, ptr %7, align 4, !tbaa !5
  %49 = icmp slt i32 %47, %48
  br i1 %49, label %50, label %61

50:                                               ; preds = %46
  %51 = load ptr, ptr %14, align 8, !tbaa !9
  %52 = load i32, ptr %9, align 4, !tbaa !5
  %53 = sext i32 %52 to i64
  %54 = getelementptr inbounds i8, ptr %51, i64 %53
  %55 = load i8, ptr %54, align 1, !tbaa !11
  %56 = sext i8 %55 to i32
  %57 = call i32 @putchar(i32 noundef %56)
  br label %58

58:                                               ; preds = %50
  %59 = load i32, ptr %9, align 4, !tbaa !5
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr %9, align 4, !tbaa !5
  br label %46, !llvm.loop !12

61:                                               ; preds = %46
  %62 = call i32 @putchar(i32 noundef 10)
  call void @llvm.lifetime.end.p0(i64 8, ptr %14) #6
  br label %63

63:                                               ; preds = %61
  %64 = load i32, ptr %8, align 4, !tbaa !5
  %65 = add nsw i32 %64, 1
  store i32 %65, ptr %8, align 4, !tbaa !5
  br label %36, !llvm.loop !14

66:                                               ; preds = %36
  %67 = load i32, ptr %6, align 4, !tbaa !5
  %68 = add nsw i32 %67, 1
  %69 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %68)
  call void @llvm.lifetime.end.p0(i64 8, ptr %13) #6
  br label %70

70:                                               ; preds = %66
  %71 = load i32, ptr %6, align 4, !tbaa !5
  %72 = add nsw i32 %71, 1
  store i32 %72, ptr %6, align 4, !tbaa !5
  br label %26, !llvm.loop !15

73:                                               ; preds = %26
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #6
  call void @llvm.lifetime.end.p0(i64 8, ptr %11) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #6
  ret i32 0
}

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

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #3

; Function Attrs: inlinehint nounwind willreturn memory(read) uwtable
declare i32 @atoi(ptr noundef nonnull) #4

; Function Attrs: inlinehint nounwind uwtable
declare i32 @putchar(i32 noundef) #5

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 = { noreturn 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 = { inlinehint nounwind willreturn memory(read) 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 #5 = { inlinehint 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 #6 = { nounwind }
attributes #7 = { noreturn nounwind }
attributes #8 = { nounwind willreturn memory(read) }

!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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}
!15 = distinct !{!15, !13}


; 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 [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [20 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @solveNQueens(i32 noundef, ptr noundef, ptr noundef) local_unnamed_addr #0

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

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

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @main(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #6
  %.not = icmp eq i32 %0, 2
  br i1 %.not, label %7, label %5

5:                                                ; preds = %2
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  tail call void @exit(i32 noundef -1) #7
  unreachable

7:                                                ; preds = %2
  %8 = getelementptr inbounds i8, ptr %1, i64 8
  %9 = load ptr, ptr %8, align 8, !tbaa !5
  %10 = tail call i32 @atoi(ptr nocapture noundef %9) #8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %4) #6
  %11 = call ptr @solveNQueens(i32 noundef %10, ptr noundef nonnull %3, ptr noundef nonnull %4)
  %12 = load i32, ptr %3, align 4, !tbaa !9
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %7
  %14 = icmp sgt i32 %10, 0
  br i1 %14, label %.lr.ph23.us.preheader, label %.lr.ph.split

.lr.ph23.us.preheader:                            ; preds = %.lr.ph
  %wide.trip.count31 = zext nneg i32 %10 to i64
  br label %.lr.ph23.us

.lr.ph23.us:                                      ; preds = %.lr.ph23.us.preheader, %._crit_edge24.split.us.us
  %indvars.iv33 = phi i64 [ 0, %.lr.ph23.us.preheader ], [ %indvars.iv.next34, %._crit_edge24.split.us.us ]
  %15 = getelementptr inbounds ptr, ptr %11, i64 %indvars.iv33
  %16 = load ptr, ptr %15, align 8, !tbaa !5
  br label %.lr.ph.us.us

.lr.ph.us.us:                                     ; preds = %._crit_edge.us.us, %.lr.ph23.us
  %indvars.iv28 = phi i64 [ %indvars.iv.next29, %._crit_edge.us.us ], [ 0, %.lr.ph23.us ]
  %17 = getelementptr inbounds ptr, ptr %16, i64 %indvars.iv28
  %18 = load ptr, ptr %17, align 8, !tbaa !5
  br label %19

19:                                               ; preds = %19, %.lr.ph.us.us
  %indvars.iv = phi i64 [ %indvars.iv.next, %19 ], [ 0, %.lr.ph.us.us ]
  %20 = getelementptr inbounds i8, ptr %18, i64 %indvars.iv
  %21 = load i8, ptr %20, align 1, !tbaa !11
  %22 = sext i8 %21 to i32
  %23 = call i32 @putchar(i32 noundef %22)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count31
  br i1 %exitcond.not, label %._crit_edge.us.us, label %19, !llvm.loop !12

._crit_edge.us.us:                                ; preds = %19
  %24 = call i32 @putchar(i32 noundef 10)
  %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
  %exitcond32.not = icmp eq i64 %indvars.iv.next29, %wide.trip.count31
  br i1 %exitcond32.not, label %._crit_edge24.split.us.us, label %.lr.ph.us.us, !llvm.loop !14

._crit_edge24.split.us.us:                        ; preds = %._crit_edge.us.us
  %indvars.iv.next34 = add nuw nsw i64 %indvars.iv33, 1
  %25 = trunc nuw nsw i64 %indvars.iv.next34 to i32
  %26 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %25)
  %27 = load i32, ptr %3, align 4, !tbaa !9
  %28 = sext i32 %27 to i64
  %29 = icmp slt i64 %indvars.iv.next34, %28
  br i1 %29, label %.lr.ph23.us, label %._crit_edge, !llvm.loop !15

.lr.ph.split:                                     ; preds = %.lr.ph, %.lr.ph.split
  %.025 = phi i32 [ %30, %.lr.ph.split ], [ 0, %.lr.ph ]
  %30 = add nuw nsw i32 %.025, 1
  %31 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %30)
  %32 = load i32, ptr %3, align 4, !tbaa !9
  %33 = icmp slt i32 %30, %32
  br i1 %33, label %.lr.ph.split, label %._crit_edge, !llvm.loop !15

._crit_edge:                                      ; preds = %.lr.ph.split, %._crit_edge24.split.us.us, %7
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %4) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #6
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #3

; Function Attrs: inlinehint mustprogress nofree nounwind willreturn memory(read) uwtable
declare i32 @atoi(ptr nocapture noundef nonnull) local_unnamed_addr #4

; Function Attrs: inlinehint nofree nounwind uwtable
declare noundef i32 @putchar(i32 noundef) local_unnamed_addr #5

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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { noreturn 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 = { inlinehint mustprogress nofree nounwind willreturn memory(read) 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 #5 = { inlinehint 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 #6 = { nounwind }
attributes #7 = { noreturn nounwind }
attributes #8 = { nounwind willreturn memory(read) }

!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"}
!14 = distinct !{!14, !13}
!15 = distinct !{!15, !13}


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