; LLVM IR from andreimaximov/algorithms :: hacker-rank/algorithms/dynamic-programming/longest-increasing-subsequence (main)

; 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: 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 i32 @_Z10searchceilRKSt6vectorIiSaIiEEmi(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %1, i32 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  store i32 %2, ptr %6, align 4, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store i64 0, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %10 = load i64, ptr %5, align 8, !tbaa !9
  store i64 %10, ptr %8, align 8, !tbaa !9
  br label %11

11:                                               ; preds = %31, %3
  %12 = load i64, ptr %8, align 8, !tbaa !9
  %13 = load i64, ptr %7, align 8, !tbaa !9
  %14 = add i64 %13, 1
  %15 = icmp ugt i64 %12, %14
  br i1 %15, label %16, label %32

16:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %17 = load i64, ptr %7, align 8, !tbaa !9
  %18 = load i64, ptr %8, align 8, !tbaa !9
  %19 = add i64 %17, %18
  %20 = udiv i64 %19, 2
  store i64 %20, ptr %9, align 8, !tbaa !9
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load i64, ptr %9, align 8, !tbaa !9
  %23 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %21, i64 noundef %22) #2
  %24 = load i32, ptr %23, align 4, !tbaa !11
  %25 = load i32, ptr %6, align 4, !tbaa !11
  %26 = icmp sge i32 %24, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %16
  %28 = load i64, ptr %9, align 8, !tbaa !9
  store i64 %28, ptr %8, align 8, !tbaa !9
  br label %31

29:                                               ; preds = %16
  %30 = load i64, ptr %9, align 8, !tbaa !9
  store i64 %30, ptr %7, align 8, !tbaa !9
  br label %31

31:                                               ; preds = %29, %27
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  br label %11, !llvm.loop !13

32:                                               ; preds = %11
  %33 = load i64, ptr %8, align 8, !tbaa !9
  %34 = trunc i64 %33 to i32
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret i32 %34
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #1 align 2

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z10searchceilRKSt6vectorIiSaIiEEmi(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp ugt i64 %1, 1
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.013 = phi i64 [ %..0, %.lr.ph ], [ 0, %3 ]
  %.01012 = phi i64 [ %.010., %.lr.ph ], [ %1, %3 ]
  %5 = add i64 %.013, %.01012
  %6 = lshr i64 %5, 1
  %7 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %6) #1
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %.not = icmp slt i32 %8, %2
  %.010. = select i1 %.not, i64 %.01012, i64 %6
  %..0 = select i1 %.not, i64 %6, i64 %.013
  %9 = add nuw i64 %..0, 1
  %10 = icmp ugt i64 %.010., %9
  br i1 %10, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.010.lcssa = phi i64 [ %1, %3 ], [ %.010., %.lr.ph ]
  %11 = trunc i64 %.010.lcssa to i32
  ret i32 %11
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNKSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #0 align 2

attributes #0 = { 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 #1 = { 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"}


; Effective O3 passes: GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass