; LLVM IR from abeaumont/competitive-programming :: hackerrank/algorithms (coin-change)

; 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" }

@a = external dso_local global [51 x i32], align 16
@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@c = external dso_local global [251 x [51 x i64]], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_Z1fii(i32 noundef, i32 noundef) #0

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

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

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

8:                                                ; preds = %30, %0
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  store i32 2, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %33

13:                                               ; preds = %8
  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 = %26, %13
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = load i32, ptr @m, align 4, !tbaa !5
  %17 = icmp sle i32 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  store i32 5, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  br label %29

19:                                               ; preds = %14
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [251 x [51 x i64]], ptr @c, i64 0, i64 %21
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [51 x i64], ptr %22, i64 0, i64 %24
  store i64 -1, ptr %25, align 8, !tbaa !9
  br label %26

26:                                               ; preds = %19
  %27 = load i32, ptr %4, align 4, !tbaa !5
  %28 = add nsw i32 %27, 1
  store i32 %28, ptr %4, align 4, !tbaa !5
  br label %14, !llvm.loop !11

29:                                               ; preds = %18
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %2, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %2, align 4, !tbaa !5
  br label %8, !llvm.loop !13

33:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #5
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %34

34:                                               ; preds = %44, %33
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = load i32, ptr @m, align 4, !tbaa !5
  %37 = icmp slt i32 %35, %36
  br i1 %37, label %39, label %38

38:                                               ; preds = %34
  store i32 8, ptr %3, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #5
  br label %47

39:                                               ; preds = %34
  %40 = load i32, ptr %5, align 4, !tbaa !5
  %41 = sext i32 %40 to i64
  %42 = getelementptr inbounds [51 x i32], ptr @a, i64 0, i64 %41
  %43 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %42)
  br label %44

44:                                               ; preds = %39
  %45 = load i32, ptr %5, align 4, !tbaa !5
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %5, align 4, !tbaa !5
  br label %34, !llvm.loop !14

47:                                               ; preds = %38
  %48 = load i32, ptr @n, align 4, !tbaa !5
  %49 = call noundef i64 @_Z1fii(i32 noundef %48, i32 noundef 0)
  %50 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %49)
  %51 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %50, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  %52 = load i32, ptr %1, align 4
  ret i32 %52
}

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #3

; 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: 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)) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}
!14 = distinct !{!14, !12}


; 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" }

@a = external dso_local global [51 x i32], align 16
@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@c = external dso_local local_unnamed_addr global [251 x [51 x i64]], align 16
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress uwtable
declare dso_local noundef i64 @_Z1fii(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %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)
  %2 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %1, ptr noundef nonnull align 4 dereferenceable(4) @m)
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %.not16 = icmp slt i32 %3, 0
  %.pre = load i32, ptr @m, align 4, !tbaa !5
  br i1 %.not16, label %.preheader, label %.preheader13.lr.ph

.preheader13.lr.ph:                               ; preds = %0
  %.not1214 = icmp slt i32 %.pre, 0
  br i1 %.not1214, label %._crit_edge19, label %.preheader13.preheader

.preheader13.preheader:                           ; preds = %.preheader13.lr.ph
  %4 = add nuw i32 %.pre, 1
  %5 = zext i32 %4 to i64
  %6 = shl nuw nsw i64 %5, 3
  %7 = add nuw i32 %3, 1
  %wide.trip.count = zext i32 %7 to i64
  %xtraiter = and i64 %wide.trip.count, 7
  %8 = icmp ult i32 %3, 7
  br i1 %8, label %.preheader.loopexit.unr-lcssa, label %.preheader13.preheader.new

.preheader13.preheader.new:                       ; preds = %.preheader13.preheader
  %unroll_iter = and i64 %wide.trip.count, 4294967288
  br label %.preheader13

.preheader13:                                     ; preds = %.preheader13, %.preheader13.preheader.new
  %indvar = phi i64 [ 0, %.preheader13.preheader.new ], [ %indvar.next.7, %.preheader13 ]
  %niter = phi i64 [ 0, %.preheader13.preheader.new ], [ %niter.next.7, %.preheader13 ]
  %9 = mul nuw nsw i64 %indvar, 408
  %scevgep = getelementptr i8, ptr @c, i64 %9
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) %scevgep, i8 -1, i64 %6, i1 false), !tbaa !9
  %10 = mul nuw i64 %indvar, 408
  %gep = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 408), i64 %10
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1) %gep, i8 -1, i64 %6, i1 false), !tbaa !9
  %11 = mul nuw i64 %indvar, 408
  %gep25 = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 816), i64 %11
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) %gep25, i8 -1, i64 %6, i1 false), !tbaa !9
  %12 = mul nuw i64 %indvar, 408
  %gep26 = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 1224), i64 %12
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1) %gep26, i8 -1, i64 %6, i1 false), !tbaa !9
  %13 = mul nuw i64 %indvar, 408
  %gep27 = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 1632), i64 %13
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) %gep27, i8 -1, i64 %6, i1 false), !tbaa !9
  %14 = mul nuw i64 %indvar, 408
  %gep28 = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 2040), i64 %14
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1) %gep28, i8 -1, i64 %6, i1 false), !tbaa !9
  %15 = mul nuw i64 %indvar, 408
  %gep29 = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 2448), i64 %15
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(1) %gep29, i8 -1, i64 %6, i1 false), !tbaa !9
  %16 = mul nuw i64 %indvar, 408
  %gep30 = getelementptr i8, ptr getelementptr (i8, ptr @c, i64 2856), i64 %16
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1) %gep30, i8 -1, i64 %6, i1 false), !tbaa !9
  %indvar.next.7 = add nuw nsw i64 %indvar, 8
  %niter.next.7 = add i64 %niter, 8
  %niter.ncmp.7 = icmp eq i64 %niter.next.7, %unroll_iter
  br i1 %niter.ncmp.7, label %.preheader.loopexit.unr-lcssa, label %.preheader13, !llvm.loop !11

.preheader.loopexit.unr-lcssa:                    ; preds = %.preheader13, %.preheader13.preheader
  %indvar.unr = phi i64 [ 0, %.preheader13.preheader ], [ %indvar.next.7, %.preheader13 ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.preheader, label %.preheader13.epil

.preheader13.epil:                                ; preds = %.preheader.loopexit.unr-lcssa, %.preheader13.epil
  %indvar.epil = phi i64 [ %indvar.next.epil, %.preheader13.epil ], [ %indvar.unr, %.preheader.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.preheader13.epil ], [ 0, %.preheader.loopexit.unr-lcssa ]
  %17 = mul nuw nsw i64 %indvar.epil, 408
  %scevgep.epil = getelementptr i8, ptr @c, i64 %17
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(1) %scevgep.epil, i8 -1, i64 %6, i1 false), !tbaa !9
  %indvar.next.epil = add nuw nsw i64 %indvar.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %.preheader, label %.preheader13.epil, !llvm.loop !13

.preheader:                                       ; preds = %.preheader.loopexit.unr-lcssa, %.preheader13.epil, %0
  %18 = icmp sgt i32 %.pre, 0
  br i1 %18, label %.lr.ph, label %._crit_edge19

._crit_edge19.loopexit:                           ; preds = %.lr.ph
  %.pre24 = load i32, ptr @n, align 4, !tbaa !5
  br label %._crit_edge19

._crit_edge19:                                    ; preds = %.preheader13.lr.ph, %._crit_edge19.loopexit, %.preheader
  %19 = phi i32 [ %.pre24, %._crit_edge19.loopexit ], [ %3, %.preheader ], [ %3, %.preheader13.lr.ph ]
  %20 = tail call noundef i64 @_Z1fii(i32 noundef %19, i32 noundef 0)
  %21 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEx(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i64 noundef %20)
  %22 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %21, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  ret i32 0

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %.preheader ]
  %23 = getelementptr inbounds [51 x i32], ptr @a, i64 0, i64 %indvars.iv
  %24 = 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) %23)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %25 = load i32, ptr @m, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = icmp slt i64 %indvars.iv.next, %26
  br i1 %27, label %.lr.ph, label %._crit_edge19.loopexit, !llvm.loop !15
}

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 #2

; 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: 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)) #3

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

!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 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.unroll.disable"}
!15 = distinct !{!15, !12}


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