; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1512)

; 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"

; Function Attrs: nounwind uwtable
declare dso_local i32 @compare(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
declare dso_local i32 @sn(i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local i32 @numIdenticalPairs(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !9
  %10 = sext i32 %9 to i64
  call void @qsort(ptr noundef %8, i64 noundef %10, i64 noundef 4, ptr noundef @compare)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 1, ptr %7, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %38, %2
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = icmp ult i32 %12, %13
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %41

16:                                               ; preds = %11
  %17 = load ptr, ptr %3, align 8, !tbaa !5
  %18 = load i32, ptr %7, align 4, !tbaa !9
  %19 = zext i32 %18 to i64
  %20 = getelementptr inbounds i32, ptr %17, i64 %19
  %21 = load i32, ptr %20, align 4, !tbaa !9
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = load i32, ptr %7, align 4, !tbaa !9
  %24 = sub i32 %23, 1
  %25 = zext i32 %24 to i64
  %26 = getelementptr inbounds i32, ptr %22, i64 %25
  %27 = load i32, ptr %26, align 4, !tbaa !9
  %28 = icmp eq i32 %21, %27
  br i1 %28, label %29, label %32

29:                                               ; preds = %16
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %6, align 4, !tbaa !9
  br label %37

32:                                               ; preds = %16
  %33 = load i32, ptr %6, align 4, !tbaa !9
  %34 = call i32 @sn(i32 noundef %33)
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = add nsw i32 %35, %34
  store i32 %36, ptr %5, align 4, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %37

37:                                               ; preds = %32, %29
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = add i32 %39, 1
  store i32 %40, ptr %7, align 4, !tbaa !9
  br label %11, !llvm.loop !11

41:                                               ; preds = %15
  %42 = load i32, ptr %5, align 4, !tbaa !9
  %43 = load i32, ptr %6, align 4, !tbaa !9
  %44 = call i32 @sn(i32 noundef %43)
  %45 = add nsw i32 %42, %44
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %45
}

declare void @qsort(ptr noundef, i64 noundef, i64 noundef, ptr noundef) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = { 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"}


; 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"

; Function Attrs: nounwind uwtable
declare dso_local i32 @compare(ptr noundef, ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @sn(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @numIdenticalPairs(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = sext i32 %1 to i64
  tail call void @qsort(ptr noundef %0, i64 noundef %3, i64 noundef 4, ptr noundef nonnull @compare) #2
  %4 = icmp ugt i32 %1, 1
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = zext i32 %1 to i64
  %invariant.gep = getelementptr i8, ptr %0, i64 -4
  br label %.lr.ph

._crit_edge:                                      ; preds = %16, %2
  %.014.lcssa = phi i32 [ 0, %2 ], [ %.115, %16 ]
  %.013.lcssa = phi i32 [ 0, %2 ], [ %.1, %16 ]
  %5 = tail call i32 @sn(i32 noundef %.013.lcssa)
  %6 = add nsw i32 %5, %.014.lcssa
  ret i32 %6

.lr.ph:                                           ; preds = %.lr.ph.preheader, %16
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next, %16 ]
  %.01317 = phi i32 [ 0, %.lr.ph.preheader ], [ %.1, %16 ]
  %.01416 = phi i32 [ 0, %.lr.ph.preheader ], [ %.115, %16 ]
  %7 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %gep = getelementptr i32, ptr %invariant.gep, i64 %indvars.iv
  %9 = load i32, ptr %gep, align 4, !tbaa !5
  %10 = icmp eq i32 %8, %9
  br i1 %10, label %11, label %13

11:                                               ; preds = %.lr.ph
  %12 = add nsw i32 %.01317, 1
  br label %16

13:                                               ; preds = %.lr.ph
  %14 = tail call i32 @sn(i32 noundef %.01317)
  %15 = add nsw i32 %14, %.01416
  br label %16

16:                                               ; preds = %11, %13
  %.115 = phi i32 [ %.01416, %11 ], [ %15, %13 ]
  %.1 = phi i32 [ %12, %11 ], [ 0, %13 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

; Function Attrs: nofree
declare void @qsort(ptr noundef, i64 noundef, i64 noundef, ptr nocapture noundef) local_unnamed_addr #1

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 = { nofree "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/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass