; LLVM IR from Muhammad-Magdi/problem-solving :: Backtracking/KnightTour.ll (Z9printPathv)

; 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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@visitTime = external dso_local global [11 x [11 x i32]], align 16
@.str = external hidden unnamed_addr constant [34 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z9printPathv() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = call i32 @puts(ptr noundef @.str)
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 0, ptr %1, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %37, %0
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = load i32, ptr @n, align 4, !tbaa !5
  %8 = icmp slt i32 %6, %7
  br i1 %8, label %10, label %9

9:                                                ; preds = %5
  store i32 2, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %40

10:                                               ; preds = %5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %33, %10
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = load i32, ptr @m, align 4, !tbaa !5
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  store i32 5, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %36

16:                                               ; preds = %11
  %17 = load i32, ptr %1, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [11 x [11 x i32]], ptr @visitTime, i64 0, i64 %18
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [11 x i32], ptr %19, i64 0, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr @m, align 4, !tbaa !5
  %26 = sub nsw i32 %25, 1
  %27 = icmp eq i32 %24, %26
  %28 = zext i1 %27 to i64
  %29 = getelementptr inbounds [3 x i8], ptr @.str.2, i64 0, i64 %28
  %30 = load i8, ptr %29, align 1, !tbaa !9
  %31 = sext i8 %30 to i32
  %32 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %23, i32 noundef %31)
  br label %33

33:                                               ; preds = %16
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %3, align 4, !tbaa !5
  br label %11, !llvm.loop !10

36:                                               ; preds = %15
  br label %37

37:                                               ; preds = %36
  %38 = load i32, ptr %1, align 4, !tbaa !5
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %1, align 4, !tbaa !5
  br label %5, !llvm.loop !12

40:                                               ; preds = %9
  %41 = call i32 @puts(ptr noundef @.str)
  ret void
}

declare i32 @puts(ptr noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

declare i32 @printf(ptr noundef, ...) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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


; 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"

@n = external dso_local local_unnamed_addr global i32, align 4
@m = external dso_local local_unnamed_addr global i32, align 4
@visitTime = external dso_local local_unnamed_addr global [11 x [11 x i32]], align 16
@.str = external hidden unnamed_addr constant [34 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nofree nounwind uwtable
define dso_local void @_Z9printPathv() local_unnamed_addr #0 {
  %1 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str)
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  %4 = load i32, ptr @m, align 4
  %5 = icmp sgt i32 %4, 0
  %or.cond = select i1 %3, i1 %5, i1 false
  br i1 %or.cond, label %.preheader, label %._crit_edge11

.preheader:                                       ; preds = %0, %._crit_edge
  %6 = phi i32 [ %10, %._crit_edge ], [ %2, %0 ]
  %7 = phi i32 [ %11, %._crit_edge ], [ %4, %0 ]
  %indvars.iv14 = phi i64 [ %indvars.iv.next15, %._crit_edge ], [ 0, %0 ]
  %8 = icmp sgt i32 %7, 0
  br i1 %8, label %.lr.ph, label %._crit_edge

._crit_edge11:                                    ; preds = %._crit_edge, %0
  %9 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) @.str)
  ret void

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load i32, ptr @n, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader
  %10 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %6, %.preheader ]
  %11 = phi i32 [ %25, %._crit_edge.loopexit ], [ %7, %.preheader ]
  %indvars.iv.next15 = add nuw nsw i64 %indvars.iv14, 1
  %12 = sext i32 %10 to i64
  %13 = icmp slt i64 %indvars.iv.next15, %12
  br i1 %13, label %.preheader, label %._crit_edge11, !llvm.loop !9

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader ]
  %14 = phi i32 [ %25, %.lr.ph ], [ %7, %.preheader ]
  %15 = getelementptr inbounds [11 x [11 x i32]], ptr @visitTime, i64 0, i64 %indvars.iv14, i64 %indvars.iv
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = add nsw i32 %14, -1
  %18 = zext i32 %17 to i64
  %19 = icmp eq i64 %indvars.iv, %18
  %20 = zext i1 %19 to i64
  %21 = getelementptr inbounds [3 x i8], ptr @.str.2, i64 0, i64 %20
  %22 = load i8, ptr %21, align 1, !tbaa !12
  %23 = sext i8 %22 to i32
  %24 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %16, i32 noundef %23)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %25 = load i32, ptr @m, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = icmp slt i64 %indvars.iv.next, %26
  br i1 %27, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !13
}

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { mustprogress 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 #1 = { 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" }

!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, !11}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.unswitch.partial.disable"}
!12 = !{!7, !7, i64 0}
!13 = distinct !{!13, !10}


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