; LLVM IR from Leet-Us-Code/DSA-A-Z-Practice :: Sid's Levels/Level - 1/Backtracking (NQueensNaive)

; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@_ZSt3cin = external global %"class.std::basic_istream", align 8

; 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

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5solvePA10_ii(ptr noundef, i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #1 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #3 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #6
  %9 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  br label %10

10:                                               ; preds = %45, %0
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = add nsw i32 %11, -1
  store i32 %12, ptr %2, align 4, !tbaa !5
  %13 = icmp ne i32 %11, 0
  br i1 %13, label %14, label %49

14:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #6
  %15 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = zext i32 %16 to i64
  %18 = call ptr @llvm.stacksave.p0()
  store ptr %18, ptr %4, align 8
  %19 = alloca [10 x i32], i64 %17, align 16
  store i64 %17, ptr %5, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #6
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %42, %14
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = icmp slt i32 %21, %22
  br i1 %23, label %25, label %24

24:                                               ; preds = %20
  store i32 4, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #6
  br label %45

25:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #6
  store i32 0, ptr %8, align 4, !tbaa !5
  br label %26

26:                                               ; preds = %38, %25
  %27 = load i32, ptr %8, align 4, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = icmp slt i32 %27, %28
  br i1 %29, label %31, label %30

30:                                               ; preds = %26
  store i32 7, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #6
  br label %41

31:                                               ; preds = %26
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [10 x i32], ptr %19, i64 %33
  %35 = load i32, ptr %8, align 4, !tbaa !5
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds [10 x i32], ptr %34, i64 0, i64 %36
  store i32 0, ptr %37, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %31
  %39 = load i32, ptr %8, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %8, align 4, !tbaa !5
  br label %26, !llvm.loop !9

41:                                               ; preds = %30
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %6, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %6, align 4, !tbaa !5
  br label %20, !llvm.loop !11

45:                                               ; preds = %24
  %46 = load i32, ptr %3, align 4, !tbaa !5
  call void @_Z5solvePA10_ii(ptr noundef %19, i32 noundef %46)
  %47 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  %48 = load ptr, ptr %4, align 8
  call void @llvm.stackrestore.p0(ptr %48)
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #6
  br label %10, !llvm.loop !12

49:                                               ; preds = %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #6
  %50 = load i32, ptr %1, align 4
  ret i32 %50
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #5

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #5

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { inlinehint mustprogress 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 = { mustprogress norecurse 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 #4 = { "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 = { nocallback nofree nosync nounwind willreturn }
attributes #6 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = distinct !{!12, !10}


; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@_ZSt3cin = external global %"class.std::basic_istream", align 8

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

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5solvePA10_ii(ptr noundef, i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #2

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #3 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #7
  %3 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %4 = load i32, ptr %1, align 4, !tbaa !5
  %5 = add nsw i32 %4, -1
  store i32 %5, ptr %1, align 4, !tbaa !5
  %.not12 = icmp eq i32 %4, 0
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %._crit_edge11.split.us
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #7
  %6 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = zext i32 %7 to i64
  %9 = call ptr @llvm.stacksave.p0()
  %10 = alloca [10 x i32], i64 %8, align 16
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = icmp sgt i32 %11, 0
  br i1 %12, label %.preheader.us.preheader, label %._crit_edge11.split.us

.preheader.us.preheader:                          ; preds = %.lr.ph
  %13 = zext nneg i32 %11 to i64
  %14 = shl nuw nsw i64 %13, 2
  %xtraiter = and i64 %13, 7
  %15 = icmp ult i32 %11, 8
  br i1 %15, label %._crit_edge11.split.us.loopexit.unr-lcssa, label %.preheader.us.preheader.new

.preheader.us.preheader.new:                      ; preds = %.preheader.us.preheader
  %unroll_iter = and i64 %13, 2147483640
  %invariant.gep = getelementptr i8, ptr %10, i64 80
  %invariant.gep15 = getelementptr i8, ptr %10, i64 120
  %invariant.gep17 = getelementptr i8, ptr %10, i64 160
  %invariant.gep19 = getelementptr i8, ptr %10, i64 200
  %invariant.gep21 = getelementptr i8, ptr %10, i64 240
  %invariant.gep23 = getelementptr i8, ptr %10, i64 280
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us, %.preheader.us.preheader.new
  %indvar = phi i64 [ 0, %.preheader.us.preheader.new ], [ %indvar.next.7, %.preheader.us ]
  %niter = phi i64 [ 0, %.preheader.us.preheader.new ], [ %niter.next.7, %.preheader.us ]
  %16 = mul nuw nsw i64 %indvar, 40
  %scevgep = getelementptr i8, ptr %10, i64 %16
  call void @llvm.memset.p0.i64(ptr align 16 %scevgep, i8 0, i64 %14, i1 false), !tbaa !5
  %17 = mul nuw i64 %indvar, 40
  %18 = or disjoint i64 %17, 40
  %scevgep.1 = getelementptr i8, ptr %10, i64 %18
  call void @llvm.memset.p0.i64(ptr align 8 %scevgep.1, i8 0, i64 %14, i1 false), !tbaa !5
  %19 = mul nuw i64 %indvar, 40
  %gep = getelementptr i8, ptr %invariant.gep, i64 %19
  call void @llvm.memset.p0.i64(ptr align 16 %gep, i8 0, i64 %14, i1 false), !tbaa !5
  %20 = mul nuw i64 %indvar, 40
  %gep16 = getelementptr i8, ptr %invariant.gep15, i64 %20
  call void @llvm.memset.p0.i64(ptr align 8 %gep16, i8 0, i64 %14, i1 false), !tbaa !5
  %21 = mul nuw i64 %indvar, 40
  %gep18 = getelementptr i8, ptr %invariant.gep17, i64 %21
  call void @llvm.memset.p0.i64(ptr align 16 %gep18, i8 0, i64 %14, i1 false), !tbaa !5
  %22 = mul nuw i64 %indvar, 40
  %gep20 = getelementptr i8, ptr %invariant.gep19, i64 %22
  call void @llvm.memset.p0.i64(ptr align 8 %gep20, i8 0, i64 %14, i1 false), !tbaa !5
  %23 = mul nuw i64 %indvar, 40
  %gep22 = getelementptr i8, ptr %invariant.gep21, i64 %23
  call void @llvm.memset.p0.i64(ptr align 16 %gep22, i8 0, i64 %14, i1 false), !tbaa !5
  %24 = mul nuw i64 %indvar, 40
  %gep24 = getelementptr i8, ptr %invariant.gep23, i64 %24
  call void @llvm.memset.p0.i64(ptr align 8 %gep24, i8 0, i64 %14, i1 false), !tbaa !5
  %indvar.next.7 = add nuw nsw i64 %indvar, 8
  %niter.next.7 = add i64 %niter, 8
  %niter.ncmp.7 = icmp eq i64 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %._crit_edge11.split.us.loopexit.unr-lcssa, label %.preheader.us, !llvm.loop !9

._crit_edge11.split.us.loopexit.unr-lcssa:        ; preds = %.preheader.us, %.preheader.us.preheader
  %indvar.unr = phi i64 [ 0, %.preheader.us.preheader ], [ %indvar.next.7, %.preheader.us ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge11.split.us, label %.preheader.us.epil

.preheader.us.epil:                               ; preds = %._crit_edge11.split.us.loopexit.unr-lcssa, %.preheader.us.epil
  %indvar.epil = phi i64 [ %indvar.next.epil, %.preheader.us.epil ], [ %indvar.unr, %._crit_edge11.split.us.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.preheader.us.epil ], [ 0, %._crit_edge11.split.us.loopexit.unr-lcssa ]
  %25 = mul nuw nsw i64 %indvar.epil, 40
  %scevgep.epil = getelementptr i8, ptr %10, i64 %25
  call void @llvm.memset.p0.i64(ptr align 8 %scevgep.epil, i8 0, i64 %14, i1 false), !tbaa !5
  %indvar.next.epil = add nuw nsw i64 %indvar.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %._crit_edge11.split.us, label %.preheader.us.epil, !llvm.loop !11

._crit_edge11.split.us:                           ; preds = %._crit_edge11.split.us.loopexit.unr-lcssa, %.preheader.us.epil, %.lr.ph
  call void @_Z5solvePA10_ii(ptr noundef nonnull %10, i32 noundef %11)
  %26 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  call void @llvm.stackrestore.p0(ptr %9)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #7
  %27 = load i32, ptr %1, align 4, !tbaa !5
  %28 = add nsw i32 %27, -1
  store i32 %28, ptr %1, align 4, !tbaa !5
  %.not = icmp eq i32 %27, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

._crit_edge:                                      ; preds = %._crit_edge11.split.us, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #7
  ret i32 0
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #4

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #5

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #5

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #6

attributes #0 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = { inlinehint mustprogress 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 = { mustprogress norecurse 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 #4 = { "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 = { mustprogress nocallback nofree nosync nounwind willreturn }
attributes #6 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #7 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}
!13 = distinct !{!13, !10}


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