; LLVM IR from Mohammed-Shoaib/Coding-Problems :: Google/Code Jam/2018/Round 1A/A.ll (Z12cut_sequenceiiRSt6vectorIiSaIiEE)

; 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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.std::initializer_list" = type { ptr, i64 }
%"class.std::allocator" = type { i8 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z12cut_sequenceiiRSt6vectorIiSaIiEE(ptr dead_on_unwind noalias writable sret(%"class.std::vector") align 8 %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 8 dereferenceable(24) %3) #0 personality ptr @__gxx_personality_v0 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i1, align 1
  %11 = alloca %"class.std::initializer_list", align 8
  %12 = alloca [1 x i32], align 4
  %13 = alloca %"class.std::allocator", align 1
  %14 = alloca ptr, align 8
  %15 = alloca i32, align 4
  %16 = alloca i32, align 4
  %17 = alloca i32, align 4
  store ptr %0, ptr %5, align 8
  store i32 %1, ptr %6, align 4, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !5
  store ptr %3, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !5
  store i1 false, ptr %10, align 1
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #3
  store i32 0, ptr %12, align 4, !tbaa !5
  %18 = getelementptr inbounds %"class.std::initializer_list", ptr %11, i32 0, i32 0
  store ptr %12, ptr %18, align 8, !tbaa !11
  %19 = getelementptr inbounds %"class.std::initializer_list", ptr %11, i32 0, i32 1
  store i64 1, ptr %19, align 8, !tbaa !14
  call void @llvm.lifetime.start.p0(i64 1, ptr %13) #3
  call void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %13) #3
  %20 = getelementptr inbounds { ptr, i64 }, ptr %11, i32 0, i32 0
  %21 = load ptr, ptr %20, align 8
  %22 = getelementptr inbounds { ptr, i64 }, ptr %11, i32 0, i32 1
  %23 = load i64, ptr %22, align 8
  invoke void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr %21, i64 %23, ptr noundef nonnull align 1 dereferenceable(1) %13)
          to label %24 unwind label %35

24:                                               ; preds = %4
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %13) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %13) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #3
  %25 = load i32, ptr %7, align 4, !tbaa !5
  %26 = load i32, ptr %6, align 4, !tbaa !5
  %27 = sdiv i32 %26, %25
  store i32 %27, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %16) #3
  store i32 0, ptr %16, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %59, %24
  %29 = load i32, ptr %16, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = load ptr, ptr %8, align 8, !tbaa !9
  %32 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %31) #3
  %33 = icmp ult i64 %30, %32
  br i1 %33, label %39, label %34

34:                                               ; preds = %28
  call void @llvm.lifetime.end.p0(i64 4, ptr %16) #3
  br label %62

35:                                               ; preds = %4
  %36 = landingpad { ptr, i32 }
          cleanup
  %37 = extractvalue { ptr, i32 } %36, 0
  store ptr %37, ptr %14, align 8
  %38 = extractvalue { ptr, i32 } %36, 1
  store i32 %38, ptr %15, align 4
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %13) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %13) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #3
  br label %66

39:                                               ; preds = %28
  %40 = load ptr, ptr %8, align 8, !tbaa !9
  %41 = load i32, ptr %16, align 4, !tbaa !5
  %42 = sext i32 %41 to i64
  %43 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %40, i64 noundef %42) #3
  %44 = load i32, ptr %43, align 4, !tbaa !5
  %45 = load i32, ptr %9, align 4, !tbaa !5
  %46 = add nsw i32 %45, %44
  store i32 %46, ptr %9, align 4, !tbaa !5
  %47 = load i32, ptr %9, align 4, !tbaa !5
  %48 = load i32, ptr %6, align 4, !tbaa !5
  %49 = icmp sge i32 %47, %48
  br i1 %49, label %50, label %58

50:                                               ; preds = %39
  store i32 0, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %17) #3
  %51 = load i32, ptr %16, align 4, !tbaa !5
  %52 = add nsw i32 %51, 1
  store i32 %52, ptr %17, align 4, !tbaa !5
  invoke void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr noundef nonnull align 4 dereferenceable(4) %17)
          to label %53 unwind label %54

53:                                               ; preds = %50
  call void @llvm.lifetime.end.p0(i64 4, ptr %17) #3
  br label %58

54:                                               ; preds = %50
  %55 = landingpad { ptr, i32 }
          cleanup
  %56 = extractvalue { ptr, i32 } %55, 0
  store ptr %56, ptr %14, align 8
  %57 = extractvalue { ptr, i32 } %55, 1
  store i32 %57, ptr %15, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %17) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %16) #3
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  br label %66

58:                                               ; preds = %53, %39
  br label %59

59:                                               ; preds = %58
  %60 = load i32, ptr %16, align 4, !tbaa !5
  %61 = add nsw i32 %60, 1
  store i32 %61, ptr %16, align 4, !tbaa !5
  br label %28, !llvm.loop !15

62:                                               ; preds = %34
  store i1 true, ptr %10, align 1
  %63 = load i1, ptr %10, align 1
  br i1 %63, label %65, label %64

64:                                               ; preds = %62
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  br label %65

65:                                               ; preds = %64, %62
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  ret void

66:                                               ; preds = %54, %35
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %67

67:                                               ; preds = %66
  %68 = load ptr, ptr %14, align 8
  %69 = load i32, ptr %15, align 4
  %70 = insertvalue { ptr, i32 } poison, ptr %68, 0
  %71 = insertvalue { ptr, i32 } %70, i32 %69, 1
  resume { ptr, i32 } %71
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24), ptr, i64, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(4)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"_ZTSSt16initializer_listIiE", !10, i64 0, !13, i64 8}
!13 = !{!"long", !7, i64 0}
!14 = !{!12, !13, i64 8}
!15 = distinct !{!15, !16}
!16 = !{!"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"

%"class.std::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.std::allocator" = type { i8 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z12cut_sequenceiiRSt6vectorIiSaIiEE(ptr dead_on_unwind noalias writable sret(%"class.std::vector") align 8 %0, i32 noundef %1, i32 noundef %2, ptr noundef nonnull align 8 dereferenceable(24) %3) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %5 = alloca [1 x i32], align 4
  %6 = alloca %"class.std::allocator", align 1
  %7 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %5) #3
  store i32 0, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %6) #3
  call void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #3
  invoke void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr nonnull %5, i64 1, ptr noundef nonnull align 1 dereferenceable(1) %6)
          to label %8 unwind label %11

8:                                                ; preds = %4
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  %9 = sdiv i32 %1, %2
  %10 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %3) #3
  %.not21 = icmp eq i64 %10, 0
  br i1 %.not21, label %._crit_edge, label %.lr.ph

11:                                               ; preds = %4
  %12 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %5) #3
  br label %25

.lr.ph:                                           ; preds = %8, %22
  %indvars.iv = phi i64 [ %indvars.iv.next.pre-phi, %22 ], [ 0, %8 ]
  %.01519 = phi i32 [ %.1, %22 ], [ 0, %8 ]
  %13 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %3, i64 noundef %indvars.iv) #3
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = add nsw i32 %14, %.01519
  %.not = icmp slt i32 %15, %9
  br i1 %.not, label %.lr.ph._crit_edge, label %16

.lr.ph._crit_edge:                                ; preds = %.lr.ph
  %.pre = add nuw nsw i64 %indvars.iv, 1
  br label %22

16:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %7) #3
  %17 = add nuw nsw i64 %indvars.iv, 1
  %18 = trunc nuw i64 %17 to i32
  store i32 %18, ptr %7, align 4, !tbaa !5
  invoke void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr noundef nonnull align 4 dereferenceable(4) %7)
          to label %19 unwind label %20

19:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %7) #3
  br label %22

20:                                               ; preds = %16
  %21 = landingpad { ptr, i32 }
          cleanup
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %7) #3
  call void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24) %0) #3
  br label %25

22:                                               ; preds = %.lr.ph._crit_edge, %19
  %indvars.iv.next.pre-phi = phi i64 [ %.pre, %.lr.ph._crit_edge ], [ %17, %19 ]
  %.1 = phi i32 [ %15, %.lr.ph._crit_edge ], [ 0, %19 ]
  %23 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %3) #3
  %24 = icmp ugt i64 %23, %indvars.iv.next.pre-phi
  br i1 %24, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %22, %8
  ret void

25:                                               ; preds = %20, %11
  %.pn = phi { ptr, i32 } [ %21, %20 ], [ %12, %11 ]
  resume { ptr, i32 } %.pn
}

; 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 nounwind uwtable
declare dso_local void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24), ptr, i64, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE9push_backEOi(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEED2Ev(ptr noundef nonnull align 8 dereferenceable(24)) unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #2 align 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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