; LLVM IR from UtkarshPathrabe/Competitive-Coding :: Model Algorithms/Backtracking/Sudoku.ll (Z12IsColumnUsedii)

; 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 @_Z12IsColumnUsedii(i32 noundef %0, i32 noundef %1) #1 {
  %3 = alloca i1, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %24, %2
  %9 = load i32, ptr %6, align 4, !tbaa !5
  %10 = icmp slt i32 %9, 9
  br i1 %10, label %12, label %11

11:                                               ; preds = %8
  store i32 2, ptr %7, align 4
  br label %27

12:                                               ; preds = %8
  %13 = load i32, ptr %6, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 %14
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [9 x i32], ptr %15, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = load i32, ptr %5, align 4, !tbaa !5
  %21 = icmp eq i32 %19, %20
  br i1 %21, label %22, label %23

22:                                               ; preds = %12
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %27

23:                                               ; preds = %12
  br label %24

24:                                               ; preds = %23
  %25 = load i32, ptr %6, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %6, align 4, !tbaa !5
  br label %8, !llvm.loop !9

27:                                               ; preds = %22, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %28 = load i32, ptr %7, align 4
  switch i32 %28, label %32 [
    i32 2, label %29
    i32 1, label %30
  ]

29:                                               ; preds = %27
  store i1 false, ptr %3, align 1
  br label %30

30:                                               ; preds = %29, %27
  %31 = load i1, ptr %3, align 1
  ret i1 %31

32:                                               ; preds = %27
  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"}


; 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 @_Z12IsColumnUsedii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %0 to i64
  %4 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 0, i64 %3
  %5 = load i32, ptr %4, align 4, !tbaa !5
  %6 = icmp eq i32 %5, %1
  br i1 %6, label %39, label %7

7:                                                ; preds = %2
  %8 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 1, i64 %3
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp eq i32 %9, %1
  br i1 %10, label %39, label %11

11:                                               ; preds = %7
  %12 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 2, i64 %3
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %14 = icmp eq i32 %13, %1
  br i1 %14, label %39, label %15

15:                                               ; preds = %11
  %16 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 3, i64 %3
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = icmp eq i32 %17, %1
  br i1 %18, label %39, label %19

19:                                               ; preds = %15
  %20 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 4, i64 %3
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = icmp eq i32 %21, %1
  br i1 %22, label %39, label %23

23:                                               ; preds = %19
  %24 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 5, i64 %3
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = icmp eq i32 %25, %1
  br i1 %26, label %39, label %27

27:                                               ; preds = %23
  %28 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 6, i64 %3
  %29 = load i32, ptr %28, align 4, !tbaa !5
  %30 = icmp eq i32 %29, %1
  br i1 %30, label %39, label %31

31:                                               ; preds = %27
  %32 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 7, i64 %3
  %33 = load i32, ptr %32, align 4, !tbaa !5
  %34 = icmp eq i32 %33, %1
  br i1 %34, label %39, label %35

35:                                               ; preds = %31
  %36 = getelementptr inbounds [9 x [9 x i32]], ptr @Grid, i64 0, i64 8, i64 %3
  %37 = load i32, ptr %36, align 4, !tbaa !5
  %38 = icmp eq i32 %37, %1
  br label %39

39:                                               ; preds = %35, %31, %27, %23, %19, %15, %11, %7, %2
  %.lcssa = phi i1 [ true, %2 ], [ true, %7 ], [ true, %11 ], [ true, %15 ], [ true, %19 ], [ true, %23 ], [ true, %27 ], [ true, %31 ], [ %38, %35 ]
  ret i1 %.lcssa
}

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,LCSSAPass,LICMPass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass