; LLVM IR from tangjz/acm-icpc :: codeforces/complete/1175G.ll (Z7seg_updRSt6vectorISt4pairIiiESaIS1_EES1_)

; 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.std::pair" = type { i32, i32 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7seg_updRSt6vectorISt4pairIiiESaIS1_EES1_(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 %1) #0 {
  %3 = alloca %"struct.std::pair", align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca %"struct.std::pair", align 4
  %7 = alloca %"struct.std::pair", align 4
  %8 = alloca %"struct.std::pair", align 4
  store i64 %1, ptr %3, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #6
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = call noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %9) #6
  %11 = trunc i64 %10 to i32
  store i32 %11, ptr %5, align 4, !tbaa !9
  br label %12

12:                                               ; preds = %30, %2
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = icmp sgt i32 %13, 1
  br i1 %14, label %15, label %28

15:                                               ; preds = %12
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = sub nsw i32 %17, 2
  %19 = sext i32 %18 to i64
  %20 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %16, i64 noundef %19) #6
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %6, ptr align 4 %20, i64 8, i1 false)
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %21) #6
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %7, ptr align 4 %22, i64 8, i1 false)
  call void @llvm.memcpy.p0.p0.i64(ptr align 4 %8, ptr align 4 %3, i64 8, i1 false)
  %23 = load i64, ptr %6, align 4
  %24 = load i64, ptr %7, align 4
  %25 = load i64, ptr %8, align 4
  %26 = call noundef i64 @_Z3detSt4pairIiiES0_S0_(i64 %23, i64 %24, i64 %25)
  %27 = icmp sle i64 %26, 0
  br label %28

28:                                               ; preds = %15, %12
  %29 = phi i1 [ false, %12 ], [ %27, %15 ]
  br i1 %29, label %30, label %34

30:                                               ; preds = %28
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  call void @_ZNSt6vectorISt4pairIiiESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24) %31) #6
  %32 = load i32, ptr %5, align 4, !tbaa !9
  %33 = add nsw i32 %32, -1
  store i32 %33, ptr %5, align 4, !tbaa !9
  br label %12, !llvm.loop !11

34:                                               ; preds = %28
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = icmp sgt i32 %35, 0
  br i1 %36, label %37, label %52

37:                                               ; preds = %34
  %38 = load ptr, ptr %4, align 8, !tbaa !5
  %39 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %38) #6
  %40 = getelementptr inbounds %"struct.std::pair", ptr %39, i32 0, i32 0
  %41 = load i32, ptr %40, align 4, !tbaa !13
  %42 = getelementptr inbounds %"struct.std::pair", ptr %3, i32 0, i32 0
  %43 = load i32, ptr %42, align 4, !tbaa !13
  %44 = icmp eq i32 %41, %43
  br i1 %44, label %45, label %52

45:                                               ; preds = %37
  %46 = load ptr, ptr %4, align 8, !tbaa !5
  %47 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %46) #6
  %48 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZSt3minISt4pairIiiEERKT_S4_S4_(ptr noundef nonnull align 4 dereferenceable(8) %47, ptr noundef nonnull align 4 dereferenceable(8) %3)
  %49 = load ptr, ptr %4, align 8, !tbaa !5
  %50 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %49) #6
  %51 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8) %50, ptr noundef nonnull align 4 dereferenceable(8) %48)
  br label %54

52:                                               ; preds = %37, %34
  %53 = load ptr, ptr %4, align 8, !tbaa !5
  call void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backERKS1_(ptr noundef nonnull align 8 dereferenceable(24) %53, ptr noundef nonnull align 4 dereferenceable(8) %3)
  br label %54

54:                                               ; preds = %52, %45
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #6
  ret void
}

; 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 noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3detSt4pairIiiES0_S0_(i64, i64, i64) #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #4

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiiESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZSt3minISt4pairIiiEERKT_S4_S4_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) #5

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) #2 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backERKS1_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(8)) #0 align 2

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

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 = { inlinehint 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 #4 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
attributes #5 = { inlinehint 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 #6 = { 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 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!14, !10, i64 0}
!14 = !{!"_ZTSSt4pairIiiE", !10, i64 0, !10, i64 4}


; 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.std::pair" = type { i32, i32 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z7seg_updRSt6vectorISt4pairIiiESaIS1_EES1_(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 %1) local_unnamed_addr #0 {
  %3 = alloca %"struct.std::pair", align 8
  store i64 %1, ptr %3, align 8
  %4 = tail call noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %5 = trunc i64 %4 to i32
  %6 = icmp sgt i32 %5, 1
  %7 = trunc i64 %1 to i32
  br i1 %6, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %2
  %8 = and i64 %4, 2147483647
  br label %9

9:                                                ; preds = %.lr.ph, %15
  %indvars.iv = phi i64 [ %8, %.lr.ph ], [ %indvars.iv.next, %15 ]
  %10 = add nsw i64 %indvars.iv, -2
  %11 = tail call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %0, i64 noundef %10) #4
  %.sroa.02.0.copyload = load i64, ptr %11, align 4
  %12 = tail call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %.sroa.01.0.copyload = load i64, ptr %12, align 4
  %13 = tail call noundef i64 @_Z3detSt4pairIiiES0_S0_(i64 %.sroa.02.0.copyload, i64 %.sroa.01.0.copyload, i64 %1)
  %14 = icmp slt i64 %13, 1
  br i1 %14, label %15, label %.critedge.thread

15:                                               ; preds = %9
  tail call void @_ZNSt6vectorISt4pairIiiESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %16 = icmp sgt i64 %indvars.iv, 2
  br i1 %16, label %9, label %.critedge.loopexit, !llvm.loop !5

.critedge.loopexit:                               ; preds = %15
  %17 = trunc nuw nsw i64 %indvars.iv.next to i32
  br label %.critedge

.critedge:                                        ; preds = %.critedge.loopexit, %2
  %.0.lcssa = phi i32 [ %5, %2 ], [ %17, %.critedge.loopexit ]
  %18 = icmp eq i32 %.0.lcssa, 1
  br i1 %18, label %.critedge.thread, label %27

.critedge.thread:                                 ; preds = %9, %.critedge
  %19 = tail call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %20 = load i32, ptr %19, align 4, !tbaa !7
  %21 = icmp eq i32 %20, %7
  br i1 %21, label %22, label %27

22:                                               ; preds = %.critedge.thread
  %23 = tail call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %24 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZSt3minISt4pairIiiEERKT_S4_S4_(ptr noundef nonnull align 4 dereferenceable(8) %23, ptr noundef nonnull align 4 dereferenceable(8) %3)
  %25 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24) %0) #4
  %26 = call noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8) %25, ptr noundef nonnull align 4 dereferenceable(8) %24)
  br label %28

27:                                               ; preds = %.critedge.thread, %.critedge
  call void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backERKS1_(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr noundef nonnull align 4 dereferenceable(8) %3)
  br label %28

28:                                               ; preds = %27, %22
  ret void
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorISt4pairIiiESaIS1_EE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3detSt4pairIiiES0_S0_(i64, i64, i64) local_unnamed_addr #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt6vectorISt4pairIiiESaIS1_EE4backEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiiESaIS1_EE8pop_backEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #1 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZSt3minISt4pairIiiEERKT_S4_S4_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #3

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(8) ptr @_ZNSt4pairIiiEaSERKS0_(ptr noundef nonnull align 4 dereferenceable(8), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorISt4pairIiiESaIS1_EE9push_backERKS1_(ptr noundef nonnull align 8 dereferenceable(24), ptr noundef nonnull align 4 dereferenceable(8)) local_unnamed_addr #0 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 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 = { inlinehint 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 = { inlinehint 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 #4 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !9, i64 0}
!8 = !{!"_ZTSSt4pairIiiE", !9, i64 0, !9, i64 4}
!9 = !{!"int", !10, i64 0}
!10 = !{!"omnipotent char", !11, i64 0}
!11 = !{!"Simple C++ TBAA"}


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