; LLVM IR from tangjz/acm-icpc :: leetcode/extra (DD_2020001-项目分配)

; 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"

@_ZZ4mainE4best = external hidden global [1001 x i32], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; 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
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3)
  %11 = load i32, ptr %3, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = mul i64 %12, 4
  call void @llvm.memset.p0.i64(ptr align 16 @_ZZ4mainE4best, i8 0, i64 %13, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %39, %0
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  store i32 2, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %42

19:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %35, %19
  %21 = load i32, ptr %6, align 4, !tbaa !5
  %22 = load i32, ptr %3, align 4, !tbaa !5
  %23 = icmp slt i32 %21, %22
  br i1 %23, label %25, label %24

24:                                               ; preds = %20
  store i32 5, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  br label %38

25:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #5
  %26 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %7)
  %27 = load i32, ptr %6, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [1001 x i32], ptr @_ZZ4mainE4best, i64 0, i64 %28
  %30 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %29, ptr noundef nonnull align 4 dereferenceable(4) %7)
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = load i32, ptr %6, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [1001 x i32], ptr @_ZZ4mainE4best, i64 0, i64 %33
  store i32 %31, ptr %34, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #5
  br label %35

35:                                               ; preds = %25
  %36 = load i32, ptr %6, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %6, align 4, !tbaa !5
  br label %20, !llvm.loop !9

38:                                               ; preds = %24
  br label %39

39:                                               ; preds = %38
  %40 = load i32, ptr %4, align 4, !tbaa !5
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %4, align 4, !tbaa !5
  br label %14, !llvm.loop !11

42:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #5
  store i32 0, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #5
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %43

43:                                               ; preds = %55, %42
  %44 = load i32, ptr %9, align 4, !tbaa !5
  %45 = load i32, ptr %3, align 4, !tbaa !5
  %46 = icmp slt i32 %44, %45
  br i1 %46, label %48, label %47

47:                                               ; preds = %43
  store i32 8, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #5
  br label %58

48:                                               ; preds = %43
  %49 = load i32, ptr %9, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [1001 x i32], ptr @_ZZ4mainE4best, i64 0, i64 %50
  %52 = load i32, ptr %51, align 4, !tbaa !5
  %53 = load i32, ptr %8, align 4, !tbaa !5
  %54 = add nsw i32 %53, %52
  store i32 %54, ptr %8, align 4, !tbaa !5
  br label %55

55:                                               ; preds = %48
  %56 = load i32, ptr %9, align 4, !tbaa !5
  %57 = add nsw i32 %56, 1
  store i32 %57, ptr %9, align 4, !tbaa !5
  br label %43, !llvm.loop !12

58:                                               ; preds = %47
  %59 = load i32, ptr %8, align 4, !tbaa !5
  %60 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %59)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %5, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  %61 = load i32, ptr %1, align 4
  ret i32 %61
}

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

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) #4

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

declare i32 @printf(ptr noundef, ...) #2

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 = { 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { 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 #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}
!12 = distinct !{!12, !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"

@_ZZ4mainE4best = external hidden global [1001 x i32], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #6
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #6
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2)
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = sext i32 %5 to i64
  %7 = shl nsw i64 %6, 2
  call void @llvm.memset.p0.i64(ptr nonnull align 16 @_ZZ4mainE4best, i8 0, i64 %7, i1 false)
  %8 = load i32, ptr %1, align 4, !tbaa !5
  %9 = icmp sgt i32 %8, 0
  br i1 %9, label %.preheader15.lr.ph, label %.preheader

.preheader15.lr.ph:                               ; preds = %0
  %10 = icmp sgt i32 %5, 0
  br i1 %10, label %.preheader15, label %._crit_edge21

.preheader15:                                     ; preds = %.preheader15.lr.ph, %._crit_edge
  %11 = phi i32 [ %22, %._crit_edge ], [ %8, %.preheader15.lr.ph ]
  %12 = phi i32 [ %23, %._crit_edge ], [ %5, %.preheader15.lr.ph ]
  %.01417 = phi i32 [ %24, %._crit_edge ], [ 0, %.preheader15.lr.ph ]
  %13 = icmp sgt i32 %12, 0
  br i1 %13, label %.lr.ph, label %._crit_edge

.preheader:                                       ; preds = %._crit_edge, %0
  %14 = phi i32 [ %5, %0 ], [ %23, %._crit_edge ]
  %15 = icmp sgt i32 %14, 0
  br i1 %15, label %.lr.ph20.preheader, label %._crit_edge21

.lr.ph20.preheader:                               ; preds = %.preheader
  %wide.trip.count = zext nneg i32 %14 to i64
  %min.iters.check = icmp ult i32 %14, 8
  br i1 %min.iters.check, label %.lr.ph20.preheader33, label %vector.ph

.lr.ph20.preheader33:                             ; preds = %middle.block, %.lr.ph20.preheader
  %indvars.iv24.ph = phi i64 [ 0, %.lr.ph20.preheader ], [ %n.vec, %middle.block ]
  %.01218.ph = phi i32 [ 0, %.lr.ph20.preheader ], [ %21, %middle.block ]
  br label %.lr.ph20

vector.ph:                                        ; preds = %.lr.ph20.preheader
  %n.vec = and i64 %wide.trip.count, 2147483640
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %18, %vector.body ]
  %vec.phi31 = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ %19, %vector.body ]
  %16 = getelementptr inbounds [1001 x i32], ptr @_ZZ4mainE4best, i64 0, i64 %index
  %17 = getelementptr inbounds i8, ptr %16, i64 16
  %wide.load = load <4 x i32>, ptr %16, align 16, !tbaa !5
  %wide.load32 = load <4 x i32>, ptr %17, align 16, !tbaa !5
  %18 = add <4 x i32> %wide.load, %vec.phi
  %19 = add <4 x i32> %wide.load32, %vec.phi31
  %index.next = add nuw i64 %index, 8
  %20 = icmp eq i64 %index.next, %n.vec
  br i1 %20, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <4 x i32> %19, %18
  %21 = call i32 @llvm.vector.reduce.add.v4i32(<4 x i32> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge21, label %.lr.ph20.preheader33

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load i32, ptr %1, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader15
  %22 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %11, %.preheader15 ]
  %23 = phi i32 [ %30, %._crit_edge.loopexit ], [ %12, %.preheader15 ]
  %24 = add nuw nsw i32 %.01417, 1
  %25 = icmp slt i32 %24, %22
  br i1 %25, label %.preheader15, label %.preheader, !llvm.loop !13

.lr.ph:                                           ; preds = %.preheader15, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader15 ]
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #6
  %26 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %3)
  %27 = getelementptr inbounds [1001 x i32], ptr @_ZZ4mainE4best, i64 0, i64 %indvars.iv
  %28 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4) %27, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %29 = load i32, ptr %28, align 4, !tbaa !5
  store i32 %29, ptr %27, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #6
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %30 = load i32, ptr %2, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = icmp slt i64 %indvars.iv.next, %31
  br i1 %32, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !15

._crit_edge21:                                    ; preds = %.lr.ph20, %middle.block, %.preheader15.lr.ph, %.preheader
  %.012.lcssa = phi i32 [ 0, %.preheader ], [ 0, %.preheader15.lr.ph ], [ %21, %middle.block ], [ %36, %.lr.ph20 ]
  %33 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %.012.lcssa)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #6
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #6
  ret i32 0

.lr.ph20:                                         ; preds = %.lr.ph20.preheader33, %.lr.ph20
  %indvars.iv24 = phi i64 [ %indvars.iv.next25, %.lr.ph20 ], [ %indvars.iv24.ph, %.lr.ph20.preheader33 ]
  %.01218 = phi i32 [ %36, %.lr.ph20 ], [ %.01218.ph, %.lr.ph20.preheader33 ]
  %34 = getelementptr inbounds [1001 x i32], ptr @_ZZ4mainE4best, i64 0, i64 %indvars.iv24
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = add nsw i32 %35, %.01218
  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next25, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge21, label %.lr.ph20, !llvm.loop !16
}

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #3

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZSt3maxIiERKT_S2_S2_(ptr noundef nonnull align 4 dereferenceable(4), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #4

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

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.vector.reduce.add.v4i32(<4 x i32>) #5

attributes #0 = { mustprogress norecurse 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #4 = { 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 #5 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10, !11, !12}
!10 = !{!"llvm.loop.mustprogress"}
!11 = !{!"llvm.loop.isvectorized", i32 1}
!12 = !{!"llvm.loop.unroll.runtime.disable"}
!13 = distinct !{!13, !10, !14}
!14 = !{!"llvm.loop.unswitch.partial.disable"}
!15 = distinct !{!15, !10}
!16 = distinct !{!16, !10, !12, !11}


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