; LLVM IR from begeekmyfriend/leetcode :: 0077_combinations (combinations)

; 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"

@stderr = external global ptr, align 8
@.str = external hidden unnamed_addr constant [19 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [32 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @combine(i32 noundef, 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 ptr, align 8
  %11 = alloca i32, align 4
  %12 = 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
  %13 = load i32, ptr %4, align 4, !tbaa !5
  %14 = icmp ne i32 %13, 3
  br i1 %14, label %15, label %18

15:                                               ; preds = %2
  %16 = load ptr, ptr @stderr, align 8, !tbaa !9
  %17 = call i32 (ptr, ptr, ...) @fprintf(ptr noundef %16, ptr noundef @.str) #6
  call void @exit(i32 noundef -1) #7
  unreachable

18:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #6
  %19 = load ptr, ptr %5, align 8, !tbaa !9
  %20 = getelementptr inbounds ptr, ptr %19, i64 1
  %21 = load ptr, ptr %20, align 8, !tbaa !9
  %22 = call i32 @atoi(ptr noundef %21) #8
  store i32 %22, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #6
  %23 = load ptr, ptr %5, align 8, !tbaa !9
  %24 = getelementptr inbounds ptr, ptr %23, i64 2
  %25 = load ptr, ptr %24, align 8, !tbaa !9
  %26 = call i32 @atoi(ptr noundef %25) #8
  store i32 %26, ptr %7, align 4, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = load i32, ptr %6, align 4, !tbaa !5
  %29 = icmp sgt i32 %27, %28
  br i1 %29, label %30, label %35

30:                                               ; preds = %18
  %31 = load ptr, ptr @stderr, align 8, !tbaa !9
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = load i32, ptr %7, align 4, !tbaa !5
  %34 = call i32 (ptr, ptr, ...) @fprintf(ptr noundef %31, ptr noundef @.str.1, i32 noundef %32, i32 noundef %33) #6
  call void @exit(i32 noundef -1) #7
  unreachable

35:                                               ; preds = %18
  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 8, ptr %10) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr %11) #6
  store i32 0, ptr %11, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %12) #6
  %36 = load i32, ptr %6, align 4, !tbaa !5
  %37 = load i32, ptr %7, align 4, !tbaa !5
  %38 = call ptr @combine(i32 noundef %36, i32 noundef %37, ptr noundef %11, ptr noundef %10)
  store ptr %38, ptr %12, align 8, !tbaa !9
  store i32 0, ptr %8, align 4, !tbaa !5
  br label %39

39:                                               ; preds = %68, %35
  %40 = load i32, ptr %8, align 4, !tbaa !5
  %41 = load i32, ptr %11, align 4, !tbaa !5
  %42 = icmp slt i32 %40, %41
  br i1 %42, label %43, label %71

43:                                               ; preds = %39
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %44

44:                                               ; preds = %63, %43
  %45 = load i32, ptr %9, align 4, !tbaa !5
  %46 = load ptr, ptr %10, align 8, !tbaa !9
  %47 = load i32, ptr %8, align 4, !tbaa !5
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds i32, ptr %46, i64 %48
  %50 = load i32, ptr %49, align 4, !tbaa !5
  %51 = icmp slt i32 %45, %50
  br i1 %51, label %52, label %66

52:                                               ; preds = %44
  %53 = load ptr, ptr %12, align 8, !tbaa !9
  %54 = load i32, ptr %8, align 4, !tbaa !5
  %55 = sext i32 %54 to i64
  %56 = getelementptr inbounds ptr, ptr %53, i64 %55
  %57 = load ptr, ptr %56, align 8, !tbaa !9
  %58 = load i32, ptr %9, align 4, !tbaa !5
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i32, ptr %57, i64 %59
  %61 = load i32, ptr %60, align 4, !tbaa !5
  %62 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %61)
  br label %63

63:                                               ; preds = %52
  %64 = load i32, ptr %9, align 4, !tbaa !5
  %65 = add nsw i32 %64, 1
  store i32 %65, ptr %9, align 4, !tbaa !5
  br label %44, !llvm.loop !11

66:                                               ; preds = %44
  %67 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  br label %68

68:                                               ; preds = %66
  %69 = load i32, ptr %8, align 4, !tbaa !5
  %70 = add nsw i32 %69, 1
  store i32 %70, ptr %8, align 4, !tbaa !5
  br label %39, !llvm.loop !13

71:                                               ; preds = %39
  call void @llvm.lifetime.end.p0(i64 8, ptr %12) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr %11) #6
  call void @llvm.lifetime.end.p0(i64 8, 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
}

; Function Attrs: nounwind
declare i32 @fprintf(ptr noundef, 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

declare i32 @printf(ptr 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 = { 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 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 = { "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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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"

@stderr = external local_unnamed_addr global ptr, align 8
@.str = external hidden unnamed_addr constant [19 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [32 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @combine(i32 noundef, 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 ptr, align 8
  %4 = alloca i32, align 4
  %.not = icmp eq i32 %0, 3
  br i1 %.not, label %8, label %5

5:                                                ; preds = %2
  %6 = load ptr, ptr @stderr, align 8, !tbaa !5
  %7 = tail call i32 (ptr, ptr, ...) @fprintf(ptr noundef %6, ptr noundef nonnull @.str) #5
  tail call void @exit(i32 noundef -1) #6
  unreachable

8:                                                ; preds = %2
  %9 = getelementptr inbounds i8, ptr %1, i64 8
  %10 = load ptr, ptr %9, align 8, !tbaa !5
  %11 = tail call i32 @atoi(ptr nocapture noundef %10) #7
  %12 = getelementptr inbounds i8, ptr %1, i64 16
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = tail call i32 @atoi(ptr nocapture noundef %13) #7
  %15 = icmp sgt i32 %14, %11
  br i1 %15, label %16, label %19

16:                                               ; preds = %8
  %17 = load ptr, ptr @stderr, align 8, !tbaa !5
  %18 = tail call i32 (ptr, ptr, ...) @fprintf(ptr noundef %17, ptr noundef nonnull @.str.1, i32 noundef %11, i32 noundef %14) #5
  tail call void @exit(i32 noundef -1) #6
  unreachable

19:                                               ; preds = %8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #8
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #8
  store i32 0, ptr %4, align 4, !tbaa !9
  %20 = call ptr @combine(i32 noundef %11, i32 noundef %14, ptr noundef nonnull %4, ptr noundef nonnull %3)
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = icmp sgt i32 %21, 0
  br i1 %22, label %.preheader, label %._crit_edge22

.preheader:                                       ; preds = %19, %._crit_edge
  %indvars.iv24 = phi i64 [ %indvars.iv.next25, %._crit_edge ], [ 0, %19 ]
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = getelementptr inbounds i32, ptr %23, i64 %indvars.iv24
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = icmp sgt i32 %25, 0
  br i1 %26, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %.preheader
  %27 = getelementptr inbounds ptr, ptr %20, i64 %indvars.iv24
  br label %28

28:                                               ; preds = %.lr.ph, %28
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %28 ]
  %29 = load ptr, ptr %27, align 8, !tbaa !5
  %30 = getelementptr inbounds i32, ptr %29, i64 %indvars.iv
  %31 = load i32, ptr %30, align 4, !tbaa !9
  %32 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %31)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  %34 = getelementptr inbounds i32, ptr %33, i64 %indvars.iv24
  %35 = load i32, ptr %34, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = icmp slt i64 %indvars.iv.next, %36
  br i1 %37, label %28, label %._crit_edge, !llvm.loop !11

._crit_edge:                                      ; preds = %28, %.preheader
  %38 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
  %39 = load i32, ptr %4, align 4, !tbaa !9
  %40 = sext i32 %39 to i64
  %41 = icmp slt i64 %indvars.iv.next25, %40
  br i1 %41, label %.preheader, label %._crit_edge22, !llvm.loop !13

._crit_edge22:                                    ; preds = %._crit_edge, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #8
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #8
  ret i32 0
}

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

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 = { cold nounwind }
attributes #6 = { noreturn nounwind }
attributes #7 = { nounwind willreturn memory(read) }
attributes #8 = { 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 = !{!"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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


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