; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/CROC 2016 - Elimination Round (Rated Unofficial Edition)/Problem B (B)

; 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_ostream" = type { ptr, %"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 }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@n = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 1

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #0 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)) #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i64, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n, ptr noundef @k)
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #5
  store i64 0, ptr %2, align 8, !tbaa !5
  %6 = load i32, ptr @k, align 4, !tbaa !9
  %7 = load i32, ptr @n, align 4, !tbaa !9
  %8 = sdiv i32 %7, 2
  %9 = icmp sge i32 %6, %8
  br i1 %9, label %10, label %22

10:                                               ; preds = %0
  %11 = load i32, ptr @n, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = mul nsw i64 1, %12
  %14 = load i32, ptr @n, align 4, !tbaa !9
  %15 = sub nsw i32 %14, 1
  %16 = sext i32 %15 to i64
  %17 = mul nsw i64 %13, %16
  %18 = sdiv i64 %17, 2
  store i64 %18, ptr %2, align 8, !tbaa !5
  %19 = load i64, ptr %2, align 8, !tbaa !5
  %20 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %19)
  %21 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %20, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %66

22:                                               ; preds = %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %40, %22
  %24 = load i32, ptr %4, align 4, !tbaa !9
  %25 = load i32, ptr @k, align 4, !tbaa !9
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %28, label %27

27:                                               ; preds = %23
  store i32 2, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %43

28:                                               ; preds = %23
  %29 = load i32, ptr @n, align 4, !tbaa !9
  %30 = load i32, ptr @k, align 4, !tbaa !9
  %31 = sub nsw i32 %29, %30
  %32 = load i32, ptr @k, align 4, !tbaa !9
  %33 = load i32, ptr %4, align 4, !tbaa !9
  %34 = sub nsw i32 %32, %33
  %35 = sub nsw i32 %34, 1
  %36 = add nsw i32 %31, %35
  %37 = sext i32 %36 to i64
  %38 = load i64, ptr %2, align 8, !tbaa !5
  %39 = add nsw i64 %38, %37
  store i64 %39, ptr %2, align 8, !tbaa !5
  br label %40

40:                                               ; preds = %28
  %41 = load i32, ptr %4, align 4, !tbaa !9
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %4, align 4, !tbaa !9
  br label %23, !llvm.loop !11

43:                                               ; preds = %27
  %44 = load i32, ptr @n, align 4, !tbaa !9
  %45 = load i32, ptr @k, align 4, !tbaa !9
  %46 = mul nsw i32 2, %45
  %47 = sub nsw i32 %44, %46
  %48 = sext i32 %47 to i64
  %49 = load i32, ptr @k, align 4, !tbaa !9
  %50 = sext i32 %49 to i64
  %51 = mul nsw i64 %48, %50
  %52 = load i64, ptr %2, align 8, !tbaa !5
  %53 = add nsw i64 %52, %51
  store i64 %53, ptr %2, align 8, !tbaa !5
  %54 = load i32, ptr @k, align 4, !tbaa !9
  %55 = sext i32 %54 to i64
  %56 = load i32, ptr @k, align 4, !tbaa !9
  %57 = sub nsw i32 %56, 1
  %58 = sext i32 %57 to i64
  %59 = mul nsw i64 %55, %58
  %60 = sdiv i64 %59, 2
  %61 = load i64, ptr %2, align 8, !tbaa !5
  %62 = add nsw i64 %61, %60
  store i64 %62, ptr %2, align 8, !tbaa !5
  %63 = load i64, ptr %2, align 8, !tbaa !5
  %64 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %63)
  %65 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %64, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %3, align 4
  br label %66

66:                                               ; preds = %43, %10
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #5
  %67 = load i32, ptr %1, align 4
  ret i32 %67
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #4

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8), i64 noundef) #0 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #4

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 = { 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 #2 = { 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 #3 = { "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 nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"long long", !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"}


; 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_ostream" = type { ptr, %"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 }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@n = external dso_local global i32, align 4
@k = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [5 x i8], align 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 #0 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)) #1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #2 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n, ptr noundef nonnull @k)
  %2 = load i32, ptr @k, align 4, !tbaa !5
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %4 = sdiv i32 %3, 2
  %.not = icmp slt i32 %2, %4
  br i1 %.not, label %.preheader, label %15

.preheader:                                       ; preds = %0
  %5 = icmp sgt i32 %2, 0
  br i1 %5, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %.preheader
  %wide.trip.count = zext nneg i32 %2 to i64
  %min.iters.check = icmp ult i32 %2, 4
  br i1 %min.iters.check, label %.lr.ph.preheader18, label %vector.ph

.lr.ph.preheader18:                               ; preds = %middle.block, %.lr.ph.preheader
  %indvars.iv.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %n.vec, %middle.block ]
  %.0912.ph = phi i64 [ 0, %.lr.ph.preheader ], [ %14, %middle.block ]
  br label %.lr.ph

vector.ph:                                        ; preds = %.lr.ph.preheader
  %n.vec = and i64 %wide.trip.count, 2147483644
  %broadcast.splatinsert = insertelement <2 x i32> poison, i32 %3, i64 0
  %broadcast.splat = shufflevector <2 x i32> %broadcast.splatinsert, <2 x i32> poison, <2 x i32> zeroinitializer
  br label %vector.body

vector.body:                                      ; preds = %vector.body, %vector.ph
  %index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
  %vec.phi = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %11, %vector.body ]
  %vec.phi16 = phi <2 x i64> [ zeroinitializer, %vector.ph ], [ %12, %vector.body ]
  %vec.ind = phi <2 x i32> [ <i32 0, i32 1>, %vector.ph ], [ %vec.ind.next, %vector.body ]
  %6 = xor <2 x i32> %vec.ind, <i32 -1, i32 -1>
  %7 = add <2 x i32> %broadcast.splat, %6
  %reass.sub = sub <2 x i32> %broadcast.splat, %vec.ind
  %8 = add <2 x i32> %reass.sub, <i32 -3, i32 -3>
  %9 = sext <2 x i32> %7 to <2 x i64>
  %10 = sext <2 x i32> %8 to <2 x i64>
  %11 = add <2 x i64> %vec.phi, %9
  %12 = add <2 x i64> %vec.phi16, %10
  %index.next = add nuw i64 %index, 4
  %vec.ind.next = add <2 x i32> %vec.ind, <i32 4, i32 4>
  %13 = icmp eq i64 %index.next, %n.vec
  br i1 %13, label %middle.block, label %vector.body, !llvm.loop !9

middle.block:                                     ; preds = %vector.body
  %bin.rdx = add <2 x i64> %12, %11
  %14 = tail call i64 @llvm.vector.reduce.add.v2i64(<2 x i64> %bin.rdx)
  %cmp.n = icmp eq i64 %n.vec, %wide.trip.count
  br i1 %cmp.n, label %._crit_edge, label %.lr.ph.preheader18

15:                                               ; preds = %0
  %16 = sext i32 %3 to i64
  %17 = add nsw i32 %3, -1
  %18 = sext i32 %17 to i64
  %19 = mul nsw i64 %18, %16
  %20 = sdiv i64 %19, 2
  br label %37

._crit_edge:                                      ; preds = %.lr.ph, %middle.block, %.preheader
  %.09.lcssa = phi i64 [ 0, %.preheader ], [ %14, %middle.block ], [ %36, %.lr.ph ]
  %21 = shl nsw i32 %2, 1
  %22 = sub nsw i32 %3, %21
  %23 = sext i32 %22 to i64
  %24 = sext i32 %2 to i64
  %25 = mul nsw i64 %23, %24
  %26 = add nsw i32 %2, -1
  %27 = sext i32 %26 to i64
  %28 = mul nsw i64 %27, %24
  %29 = sdiv i64 %28, 2
  %30 = add nsw i64 %29, %25
  %31 = add i64 %30, %.09.lcssa
  br label %37

.lr.ph:                                           ; preds = %.lr.ph.preheader18, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %indvars.iv.ph, %.lr.ph.preheader18 ]
  %.0912 = phi i64 [ %36, %.lr.ph ], [ %.0912.ph, %.lr.ph.preheader18 ]
  %32 = trunc i64 %indvars.iv to i32
  %33 = xor i32 %32, -1
  %34 = add i32 %3, %33
  %35 = sext i32 %34 to i64
  %36 = add nsw i64 %.0912, %35
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

37:                                               ; preds = %._crit_edge, %15
  %.sink15 = phi i64 [ %31, %._crit_edge ], [ %20, %15 ]
  %38 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %.sink15)
  %39 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %38, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.vector.reduce.add.v2i64(<2 x i64>) #4

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 = { 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 #2 = { 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 #3 = { 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 #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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, !12, !11}


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