; LLVM IR from upupming/algorithm :: acwing/算法基础课/第五讲 动态规划/计数类DP/900. 整数划分 (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"

%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@n = external dso_local global i32, align 4
@f = external dso_local global [1010 x i32], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %5 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @n)
  store i32 1, ptr @f, align 16, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %38, %0
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = load i32, ptr @n, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %41

11:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %12 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %12, ptr %4, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %34, %11
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = load i32, ptr @n, align 4, !tbaa !5
  %16 = icmp sle i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  store i32 5, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %37

18:                                               ; preds = %13
  %19 = load i32, ptr %4, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %20
  %22 = load i32, ptr %21, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = load i32, ptr %2, align 4, !tbaa !5
  %25 = sub nsw i32 %23, %24
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = add nsw i32 %22, %28
  %30 = srem i32 %29, 1000000007
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %32
  store i32 %30, ptr %33, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %18
  %35 = load i32, ptr %4, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %4, align 4, !tbaa !5
  br label %13, !llvm.loop !9

37:                                               ; preds = %17
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %2, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %2, align 4, !tbaa !5
  br label %6, !llvm.loop !11

41:                                               ; preds = %10
  %42 = load i32, ptr @n, align 4, !tbaa !5
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %43
  %45 = load i32, ptr %44, align 4, !tbaa !5
  %46 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %45)
  %47 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %46, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret i32 0
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #3 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #4

attributes #0 = { mustprogress norecurse 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 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #3 = { 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 = { 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 #5 = { 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"}
!11 = distinct !{!11, !10}


; 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::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@n = external dso_local global i32, align 4
@f = external dso_local local_unnamed_addr global [1010 x i32], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @n)
  store i32 1, ptr @f, align 16, !tbaa !5
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %.not13 = icmp slt i32 %2, 1
  br i1 %.not13, label %._crit_edge, label %.preheader.preheader

.preheader.preheader:                             ; preds = %0
  %3 = add nuw i32 %2, 1
  %wide.trip.count19 = zext i32 %3 to i64
  %4 = shl nuw nsw i64 %wide.trip.count19, 2
  %scevgep21 = getelementptr i8, ptr @f, i64 %4
  %5 = add nsw i64 %4, -4
  %6 = zext nneg i32 %2 to i64
  %7 = zext nneg i32 %2 to i64
  %bound1 = icmp ugt ptr %scevgep21, @f
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %.loopexit
  %indvar = phi i64 [ 0, %.preheader.preheader ], [ %indvar.next, %.loopexit ]
  %indvars.iv = phi i64 [ 1, %.preheader.preheader ], [ %indvars.iv.next, %.loopexit ]
  %8 = sub i64 %6, %indvar
  %min.iters.check = icmp ult i64 %8, 8
  br i1 %min.iters.check, label %scalar.ph.preheader, label %vector.memcheck

scalar.ph.preheader:                              ; preds = %middle.block, %vector.memcheck, %.preheader
  %indvars.iv15.ph = phi i64 [ %indvars.iv, %vector.memcheck ], [ %indvars.iv, %.preheader ], [ %ind.end, %middle.block ]
  %9 = sub i64 %wide.trip.count19, %indvars.iv15.ph
  %xtraiter = and i64 %9, 1
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %scalar.ph.prol.loopexit, label %scalar.ph.prol

scalar.ph.prol:                                   ; preds = %scalar.ph.preheader
  %10 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %indvars.iv15.ph
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = sub nuw nsw i64 %indvars.iv15.ph, %indvars.iv
  %13 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = add nsw i32 %14, %11
  %16 = srem i32 %15, 1000000007
  store i32 %16, ptr %10, align 4, !tbaa !5
  %indvars.iv.next16.prol = add nuw nsw i64 %indvars.iv15.ph, 1
  br label %scalar.ph.prol.loopexit

scalar.ph.prol.loopexit:                          ; preds = %scalar.ph.prol, %scalar.ph.preheader
  %indvars.iv15.unr = phi i64 [ %indvars.iv15.ph, %scalar.ph.preheader ], [ %indvars.iv.next16.prol, %scalar.ph.prol ]
  %17 = icmp eq i64 %indvars.iv15.ph, %7
  br i1 %17, label %.loopexit, label %scalar.ph

vector.memcheck:                                  ; preds = %.preheader
  %18 = shl i64 %indvar, 2
  %19 = sub i64 %5, %18
  %scevgep22 = getelementptr i8, ptr @f, i64 %19
  %20 = shl nuw nsw i64 %indvar, 2
  %gep = getelementptr i8, ptr getelementptr (i8, ptr @f, i64 4), i64 %20
  %bound0 = icmp ult ptr %gep, %scevgep22
  %found.conflict = and i1 %bound0, %bound1
  br i1 %found.conflict, label %scalar.ph.preheader, label %vector.ph

vector.ph:                                        ; preds = %vector.memcheck
  %n.vec = and i64 %8, -8
  %ind.end = add i64 %indvars.iv, %n.vec
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %offset.idx = add i64 %indvars.iv, %index
  %21 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %offset.idx
  %22 = getelementptr inbounds i8, ptr %21, i64 16
  %wide.load = load <4 x i32>, ptr %21, align 4, !tbaa !5, !alias.scope !9, !noalias !12
  %wide.load23 = load <4 x i32>, ptr %22, align 4, !tbaa !5, !alias.scope !9, !noalias !12
  %23 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %index
  %24 = getelementptr inbounds i8, ptr %23, i64 16
  %wide.load24 = load <4 x i32>, ptr %23, align 16, !tbaa !5, !alias.scope !12
  %wide.load25 = load <4 x i32>, ptr %24, align 16, !tbaa !5, !alias.scope !12
  %25 = add nsw <4 x i32> %wide.load24, %wide.load
  %26 = add nsw <4 x i32> %wide.load25, %wide.load23
  %27 = srem <4 x i32> %25, <i32 1000000007, i32 1000000007, i32 1000000007, i32 1000000007>
  %28 = srem <4 x i32> %26, <i32 1000000007, i32 1000000007, i32 1000000007, i32 1000000007>
  store <4 x i32> %27, ptr %21, align 4, !tbaa !5, !alias.scope !9, !noalias !12
  store <4 x i32> %28, ptr %22, align 4, !tbaa !5, !alias.scope !9, !noalias !12
  %index.next = add nuw i64 %index, 8
  %29 = icmp eq i64 %index.next, %n.vec
  br i1 %29, label %middle.block, label %vector.body, !llvm.loop !14

middle.block:                                     ; preds = %vector.body
  %cmp.n = icmp eq i64 %8, %n.vec
  br i1 %cmp.n, label %.loopexit, label %scalar.ph.preheader

._crit_edge:                                      ; preds = %.loopexit, %0
  %30 = sext i32 %2 to i64
  %31 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %30
  %32 = load i32, ptr %31, align 4, !tbaa !5
  %33 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %32)
  %34 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %33, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret i32 0

.loopexit:                                        ; preds = %scalar.ph.prol.loopexit, %scalar.ph, %middle.block
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond20.not = icmp eq i64 %indvars.iv.next, %wide.trip.count19
  %indvar.next = add i64 %indvar, 1
  br i1 %exitcond20.not, label %._crit_edge, label %.preheader, !llvm.loop !18

scalar.ph:                                        ; preds = %scalar.ph.prol.loopexit, %scalar.ph
  %indvars.iv15 = phi i64 [ %indvars.iv.next16.1, %scalar.ph ], [ %indvars.iv15.unr, %scalar.ph.prol.loopexit ]
  %35 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %indvars.iv15
  %36 = load i32, ptr %35, align 4, !tbaa !5
  %37 = sub nuw nsw i64 %indvars.iv15, %indvars.iv
  %38 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %37
  %39 = load i32, ptr %38, align 4, !tbaa !5
  %40 = add nsw i32 %39, %36
  %41 = srem i32 %40, 1000000007
  store i32 %41, ptr %35, align 4, !tbaa !5
  %indvars.iv.next16 = add nuw nsw i64 %indvars.iv15, 1
  %42 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %indvars.iv.next16
  %43 = load i32, ptr %42, align 4, !tbaa !5
  %44 = sub nuw nsw i64 %indvars.iv.next16, %indvars.iv
  %45 = getelementptr inbounds [1010 x i32], ptr @f, i64 0, i64 %44
  %46 = load i32, ptr %45, align 4, !tbaa !5
  %47 = add nsw i32 %46, %43
  %48 = srem i32 %47, 1000000007
  store i32 %48, ptr %42, align 4, !tbaa !5
  %indvars.iv.next16.1 = add nuw nsw i64 %indvars.iv15, 2
  %exitcond.not.1 = icmp eq i64 %indvars.iv.next16.1, %wide.trip.count19
  br i1 %exitcond.not.1, label %.loopexit, label %scalar.ph, !llvm.loop !19
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #1

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #3

attributes #0 = { mustprogress norecurse 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 = { "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 = { 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 #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" }

!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 = distinct !{!10, !11}
!11 = distinct !{!11, !"LVerDomain"}
!12 = !{!13}
!13 = distinct !{!13, !11}
!14 = distinct !{!14, !15, !16, !17}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{!"llvm.loop.isvectorized", i32 1}
!17 = !{!"llvm.loop.unroll.runtime.disable"}
!18 = distinct !{!18, !15}
!19 = distinct !{!19, !15, !16}


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