; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Backtracking/Sudoku.ll (Z9IsBoxUsediii)

; 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"

@Grid = external dso_local global [9 x [9 x i32]], align 16

; 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 nounwind uwtable
define dso_local noundef zeroext i1 @_Z9IsBoxUsediii(i32 noundef %0, i32 noundef %1, i32 noundef %2) #1 {
  %4 = alloca i1, align 1
  %5 = alloca i32, align 4
  %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
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %42, %3
  %12 = load i32, ptr %8, align 4, !tbaa !5
  %13 = icmp slt i32 %12, 3
  br i1 %13, label %15, label %14

14:                                               ; preds = %11
  store i32 2, ptr %9, align 4
  br label %45

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  store i32 0, ptr %10, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %36, %15
  %17 = load i32, ptr %10, align 4, !tbaa !5
  %18 = icmp slt i32 %17, 3
  br i1 %18, label %20, label %19

19:                                               ; preds = %16
  store i32 5, ptr %9, align 4
  br label %39

20:                                               ; preds = %16
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = load i32, ptr %8, align 4, !tbaa !5
  %23 = add nsw i32 %21, %22
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %24
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = load i32, ptr %10, align 4, !tbaa !5
  %28 = add nsw i32 %26, %27
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [9 x i32], ptr %25, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = load i32, ptr %7, align 4, !tbaa !5
  %33 = icmp eq i32 %31, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %20
  store i1 true, ptr %4, align 1
  store i32 1, ptr %9, align 4
  br label %39

35:                                               ; preds = %20
  br label %36

36:                                               ; preds = %35
  %37 = load i32, ptr %10, align 4, !tbaa !5
  %38 = add nsw i32 %37, 1
  store i32 %38, ptr %10, align 4, !tbaa !5
  br label %16, !llvm.loop !9

39:                                               ; preds = %34, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  %40 = load i32, ptr %9, align 4
  switch i32 %40, label %45 [
    i32 5, label %41
  ]

41:                                               ; preds = %39
  br label %42

42:                                               ; preds = %41
  %43 = load i32, ptr %8, align 4, !tbaa !5
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %8, align 4, !tbaa !5
  br label %11, !llvm.loop !11

45:                                               ; preds = %39, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  %46 = load i32, ptr %9, align 4
  switch i32 %46, label %50 [
    i32 2, label %47
    i32 1, label %48
  ]

47:                                               ; preds = %45
  store i1 false, ptr %4, align 1
  br label %48

48:                                               ; preds = %47, %45
  %49 = load i1, ptr %4, align 1
  ret i1 %49

50:                                               ; preds = %45
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = !{!"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}


; 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"

@Grid = external dso_local local_unnamed_addr global [9 x [9 x i32]], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z9IsBoxUsediii(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
.preheader:
  %3 = sext i32 %1 to i64
  %4 = sext i32 %0 to i64
  %5 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %4, i64 %3
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = icmp eq i32 %6, %2
  br i1 %7, label %.loopexit.loopexit, label %8

8:                                                ; preds = %.preheader
  %9 = add nsw i64 %3, 1
  %10 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %4, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = icmp eq i32 %11, %2
  br i1 %12, label %.loopexit.loopexit, label %13

13:                                               ; preds = %8
  %14 = add nsw i64 %3, 2
  %15 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %4, i64 %14
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = icmp eq i32 %16, %2
  br i1 %17, label %.loopexit.loopexit, label %.preheader.1

.preheader.1:                                     ; preds = %13
  %18 = add nsw i64 %4, 1
  %19 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %18, i64 %3
  %20 = load i32, ptr %19, align 4, !tbaa !5
  %21 = icmp eq i32 %20, %2
  br i1 %21, label %.loopexit.loopexit, label %22

22:                                               ; preds = %.preheader.1
  %23 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %18, i64 %9
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = icmp eq i32 %24, %2
  br i1 %25, label %.loopexit.loopexit, label %26

26:                                               ; preds = %22
  %27 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %18, i64 %14
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = icmp eq i32 %28, %2
  br i1 %29, label %.loopexit.loopexit, label %.preheader.2

.preheader.2:                                     ; preds = %26
  %30 = add nsw i64 %4, 2
  %31 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %30, i64 %3
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = icmp eq i32 %32, %2
  br i1 %33, label %.loopexit.loopexit, label %34

34:                                               ; preds = %.preheader.2
  %35 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %30, i64 %9
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = icmp eq i32 %36, %2
  br i1 %37, label %.loopexit.loopexit, label %38

38:                                               ; preds = %34
  %39 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %30, i64 %14
  %40 = load i32, ptr %39, align 4, !tbaa !5
  %41 = icmp eq i32 %40, %2
  br i1 %41, label %.loopexit.loopexit, label %.loopexit

.loopexit.loopexit:                               ; preds = %38, %34, %.preheader.2, %26, %22, %.preheader.1, %13, %8, %.preheader
  br label %.loopexit

.loopexit:                                        ; preds = %38, %.loopexit.loopexit
  %42 = phi i1 [ true, %.loopexit.loopexit ], [ false, %38 ]
  ret i1 %42
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) 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" }

!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"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass