; LLVM IR from Hunterdii/GeeksforGeeks-POTD :: December 2024 GFG SOLUTION (December-09)

; 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"

%struct.Interval = type { i32, i32 }

@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [8 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @insertInterval(ptr noundef, i32 noundef, i64, 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: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

; 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() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca %struct.Interval, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2)
  br label %11

11:                                               ; preds = %79, %0
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = add nsw i32 %12, -1
  store i32 %13, ptr %2, align 4, !tbaa !5
  %14 = icmp ne i32 %12, 0
  br i1 %14, label %15, label %84

15:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %3)
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = mul i64 %18, 8
  %20 = call noalias ptr @malloc(i64 noundef %19) #6
  store ptr %20, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %38, %15
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  br label %41

26:                                               ; preds = %21
  %27 = load ptr, ptr %4, align 8, !tbaa !9
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds %struct.Interval, ptr %27, i64 %29
  %31 = getelementptr inbounds %struct.Interval, ptr %30, i32 0, i32 0
  %32 = load ptr, ptr %4, align 8, !tbaa !9
  %33 = load i32, ptr %5, align 4, !tbaa !5
  %34 = sext i32 %33 to i64
  %35 = getelementptr inbounds %struct.Interval, ptr %32, i64 %34
  %36 = getelementptr inbounds %struct.Interval, ptr %35, i32 0, i32 1
  %37 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %31, ptr noundef %36)
  br label %38

38:                                               ; preds = %26
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %5, align 4, !tbaa !5
  br label %21, !llvm.loop !11

41:                                               ; preds = %25
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #5
  %42 = getelementptr inbounds %struct.Interval, ptr %6, i32 0, i32 0
  %43 = getelementptr inbounds %struct.Interval, ptr %6, i32 0, i32 1
  %44 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %42, ptr noundef %43)
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #5
  %45 = load ptr, ptr %4, align 8, !tbaa !9
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = load i64, ptr %6, align 4
  %48 = call ptr @insertInterval(ptr noundef %45, i32 noundef %46, i64 %47, ptr noundef %7)
  store ptr %48, ptr %8, align 8, !tbaa !9
  %49 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #5
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %50

50:                                               ; preds = %76, %41
  %51 = load i32, ptr %9, align 4, !tbaa !5
  %52 = load i32, ptr %7, align 4, !tbaa !5
  %53 = icmp slt i32 %51, %52
  br i1 %53, label %55, label %54

54:                                               ; preds = %50
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #5
  br label %79

55:                                               ; preds = %50
  %56 = load ptr, ptr %8, align 8, !tbaa !9
  %57 = load i32, ptr %9, align 4, !tbaa !5
  %58 = sext i32 %57 to i64
  %59 = getelementptr inbounds %struct.Interval, ptr %56, i64 %58
  %60 = getelementptr inbounds %struct.Interval, ptr %59, i32 0, i32 0
  %61 = load i32, ptr %60, align 4, !tbaa !13
  %62 = load ptr, ptr %8, align 8, !tbaa !9
  %63 = load i32, ptr %9, align 4, !tbaa !5
  %64 = sext i32 %63 to i64
  %65 = getelementptr inbounds %struct.Interval, ptr %62, i64 %64
  %66 = getelementptr inbounds %struct.Interval, ptr %65, i32 0, i32 1
  %67 = load i32, ptr %66, align 4, !tbaa !15
  %68 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i32 noundef %61, i32 noundef %67)
  %69 = load i32, ptr %9, align 4, !tbaa !5
  %70 = load i32, ptr %7, align 4, !tbaa !5
  %71 = sub nsw i32 %70, 1
  %72 = icmp ne i32 %69, %71
  br i1 %72, label %73, label %75

73:                                               ; preds = %55
  %74 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  br label %75

75:                                               ; preds = %73, %55
  br label %76

76:                                               ; preds = %75
  %77 = load i32, ptr %9, align 4, !tbaa !5
  %78 = add nsw i32 %77, 1
  store i32 %78, ptr %9, align 4, !tbaa !5
  br label %50, !llvm.loop !16

79:                                               ; preds = %54
  %80 = call i32 (ptr, ...) @printf(ptr noundef @.str.5)
  %81 = load ptr, ptr %4, align 8, !tbaa !9
  call void @free(ptr noundef %81) #5
  %82 = load ptr, ptr %8, align 8, !tbaa !9
  call void @free(ptr noundef %82) #5
  %83 = call i32 (ptr, ...) @printf(ptr noundef @.str.6)
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  br label %11, !llvm.loop !17

84:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

declare i32 @printf(ptr noundef, ...) #3

; Function Attrs: nounwind
declare void @free(ptr noundef) #4

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 allocsize(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 = { "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 = { 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 #5 = { nounwind }
attributes #6 = { nounwind allocsize(0) }

!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 = !{!14, !6, i64 0}
!14 = !{!"", !6, i64 0, !6, i64 4}
!15 = !{!14, !6, i64 4}
!16 = distinct !{!16, !12}
!17 = distinct !{!17, !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"

%struct.Interval = type { i32, i32 }

@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [8 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [2 x i8], align 1
@.str.5 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.6 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: nounwind uwtable
declare dso_local ptr @insertInterval(ptr noundef, i32 noundef, i64, 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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #2

; 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() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca %struct.Interval, align 8
  %4 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1)
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = add nsw i32 %6, -1
  store i32 %7, ptr %1, align 4, !tbaa !5
  %.not22 = icmp eq i32 %6, 0
  br i1 %.not22, label %._crit_edge25, label %.lr.ph24

.lr.ph24:                                         ; preds = %0
  %8 = getelementptr inbounds i8, ptr %3, i64 4
  br label %9

9:                                                ; preds = %.lr.ph24, %._crit_edge21
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %2)
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = shl nsw i64 %12, 3
  %14 = call noalias ptr @malloc(i64 noundef %13) #6
  %15 = icmp sgt i32 %11, 0
  br i1 %15, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %9
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #5
  %16 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %3, ptr noundef nonnull %8)
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %4) #5
  %17 = load i32, ptr %2, align 4, !tbaa !5
  %18 = load i64, ptr %3, align 8
  %19 = call ptr @insertInterval(ptr noundef %14, i32 noundef %17, i64 %18, ptr noundef nonnull %4)
  %20 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = icmp sgt i32 %21, 0
  br i1 %22, label %.lr.ph20, label %._crit_edge21

.lr.ph:                                           ; preds = %9, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %9 ]
  %23 = getelementptr inbounds %struct.Interval, ptr %14, i64 %indvars.iv
  %24 = getelementptr inbounds i8, ptr %23, i64 4
  %25 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef %23, ptr noundef nonnull %24)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = sext i32 %26 to i64
  %28 = icmp slt i64 %indvars.iv.next, %27
  br i1 %28, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge21:                                    ; preds = %43, %._crit_edge
  %29 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.5)
  call void @free(ptr noundef %14) #5
  call void @free(ptr noundef %19) #5
  %30 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.6)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %4) #5
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  %31 = load i32, ptr %1, align 4, !tbaa !5
  %32 = add nsw i32 %31, -1
  store i32 %32, ptr %1, align 4, !tbaa !5
  %.not = icmp eq i32 %31, 0
  br i1 %.not, label %._crit_edge25, label %9, !llvm.loop !11

.lr.ph20:                                         ; preds = %._crit_edge, %43
  %indvars.iv27 = phi i64 [ %indvars.iv.next28, %43 ], [ 0, %._crit_edge ]
  %33 = getelementptr inbounds %struct.Interval, ptr %19, i64 %indvars.iv27
  %34 = load i32, ptr %33, align 4, !tbaa !12
  %35 = getelementptr inbounds i8, ptr %33, i64 4
  %36 = load i32, ptr %35, align 4, !tbaa !14
  %37 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i32 noundef %34, i32 noundef %36)
  %38 = load i32, ptr %4, align 4, !tbaa !5
  %39 = add nsw i32 %38, -1
  %40 = zext i32 %39 to i64
  %.not16 = icmp eq i64 %indvars.iv27, %40
  br i1 %.not16, label %43, label %41

41:                                               ; preds = %.lr.ph20
  %42 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  %.pre = load i32, ptr %4, align 4, !tbaa !5
  br label %43

43:                                               ; preds = %.lr.ph20, %41
  %44 = phi i32 [ %38, %.lr.ph20 ], [ %.pre, %41 ]
  %indvars.iv.next28 = add nuw nsw i64 %indvars.iv27, 1
  %45 = sext i32 %44 to i64
  %46 = icmp slt i64 %indvars.iv.next28, %45
  br i1 %46, label %.lr.ph20, label %._crit_edge21, !llvm.loop !15

._crit_edge25:                                    ; preds = %._crit_edge21, %0
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #4

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 = { mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { 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 #4 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { nounwind }
attributes #6 = { nounwind allocsize(0) }

!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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}
!12 = !{!13, !6, i64 0}
!13 = !{!"", !6, i64 0, !6, i64 4}
!14 = !{!13, !6, i64 4}
!15 = distinct !{!15, !10}


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