; LLVM IR from Mohammed-Shoaib/Coding-Problems :: Codeforces/Solutions/1334B.ll (Z1BiiRSt6vectorIiSaIiEE)

; 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::reverse_iterator" = type { %"class.__gnu_cxx::__normal_iterator" }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z1BiiRSt6vectorIiSaIiEE(i32 noundef %0, i32 noundef %1, ptr noundef nonnull align 8 dereferenceable(24) %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca ptr, align 8
  %8 = alloca i64, align 8
  %9 = alloca i64, align 8
  %10 = alloca %"class.std::reverse_iterator", align 8
  %11 = alloca %"class.std::reverse_iterator", align 8
  %12 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !5
  store ptr %2, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  store i64 0, ptr %9, align 8, !tbaa !11
  store i64 0, ptr %8, align 8, !tbaa !11
  %13 = load ptr, ptr %7, align 8, !tbaa !9
  call void @_ZNSt6vectorIiSaIiEE6rbeginEv(ptr dead_on_unwind writable sret(%"class.std::reverse_iterator") align 8 %10, ptr noundef nonnull align 8 dereferenceable(24) %13) #4
  %14 = load ptr, ptr %7, align 8, !tbaa !9
  call void @_ZNSt6vectorIiSaIiEE4rendEv(ptr dead_on_unwind writable sret(%"class.std::reverse_iterator") align 8 %11, ptr noundef nonnull align 8 dereferenceable(24) %14) #4
  call void @_ZSt4sortISt16reverse_iteratorIN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEEEEvT_S9_(ptr noundef %10, ptr noundef %11)
  br label %15

15:                                               ; preds = %39, %3
  %16 = load i64, ptr %9, align 8, !tbaa !11
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = icmp slt i64 %16, %18
  br i1 %19, label %20, label %40

20:                                               ; preds = %15
  %21 = load ptr, ptr %7, align 8, !tbaa !9
  %22 = load i64, ptr %9, align 8, !tbaa !11
  %23 = add nsw i64 %22, 1
  store i64 %23, ptr %9, align 8, !tbaa !11
  %24 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %21, i64 noundef %22) #4
  %25 = load i32, ptr %24, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = load i64, ptr %8, align 8, !tbaa !11
  %28 = add nsw i64 %27, %26
  store i64 %28, ptr %8, align 8, !tbaa !11
  %29 = load i64, ptr %8, align 8, !tbaa !11
  %30 = load i32, ptr %6, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = load i64, ptr %9, align 8, !tbaa !11
  %33 = mul nsw i64 %31, %32
  %34 = icmp slt i64 %29, %33
  br i1 %34, label %35, label %39

35:                                               ; preds = %20
  %36 = load i64, ptr %9, align 8, !tbaa !11
  %37 = sub nsw i64 %36, 1
  %38 = trunc i64 %37 to i32
  store i32 %38, ptr %4, align 4
  store i32 1, ptr %12, align 4
  br label %43

39:                                               ; preds = %20
  br label %15, !llvm.loop !13

40:                                               ; preds = %15
  %41 = load i64, ptr %9, align 8, !tbaa !11
  %42 = trunc i64 %41 to i32
  store i32 %42, ptr %4, align 4
  store i32 1, ptr %12, align 4
  br label %43

43:                                               ; preds = %40, %35
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  %44 = load i32, ptr %4, align 4
  ret i32 %44
}

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortISt16reverse_iteratorIN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEEEEvT_S9_(ptr noundef, ptr noundef) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE6rbeginEv(ptr dead_on_unwind noalias writable sret(%"class.std::reverse_iterator") align 8, ptr noundef nonnull align 8 dereferenceable(24)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE4rendEv(ptr dead_on_unwind noalias writable sret(%"class.std::reverse_iterator") align 8, ptr noundef nonnull align 8 dereferenceable(24)) #3 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #3 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 = { 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 #3 = { 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 = { 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 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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::reverse_iterator" = type { %"class.__gnu_cxx::__normal_iterator" }
%"class.__gnu_cxx::__normal_iterator" = type { ptr }

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z1BiiRSt6vectorIiSaIiEE(i32 noundef %0, i32 noundef %1, ptr noundef nonnull align 8 dereferenceable(24) %2) local_unnamed_addr #0 {
  %4 = alloca %"class.std::reverse_iterator", align 8
  %5 = alloca %"class.std::reverse_iterator", align 8
  call void @_ZNSt6vectorIiSaIiEE6rbeginEv(ptr dead_on_unwind nonnull writable sret(%"class.std::reverse_iterator") align 8 %4, ptr noundef nonnull align 8 dereferenceable(24) %2) #4
  call void @_ZNSt6vectorIiSaIiEE4rendEv(ptr dead_on_unwind nonnull writable sret(%"class.std::reverse_iterator") align 8 %5, ptr noundef nonnull align 8 dereferenceable(24) %2) #4
  call void @_ZSt4sortISt16reverse_iteratorIN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEEEEvT_S9_(ptr noundef nonnull %4, ptr noundef nonnull %5)
  %6 = sext i32 %1 to i64
  %7 = call i32 @llvm.smax.i32(i32 %0, i32 0)
  %smax = zext nneg i32 %7 to i64
  br label %8

8:                                                ; preds = %9, %3
  %.012 = phi i64 [ 0, %3 ], [ %14, %9 ]
  %.0 = phi i64 [ 0, %3 ], [ %10, %9 ]
  %exitcond.not = icmp eq i64 %.0, %smax
  br i1 %exitcond.not, label %17, label %9

9:                                                ; preds = %8
  %10 = add nuw nsw i64 %.0, 1
  %11 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %2, i64 noundef %.0) #4
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = add nsw i64 %.012, %13
  %15 = mul nsw i64 %10, %6
  %16 = icmp slt i64 %14, %15
  br i1 %16, label %17, label %8, !llvm.loop !9

17:                                               ; preds = %8, %9
  %.0.lcssa = phi i64 [ %smax, %8 ], [ %.0, %9 ]
  %.013 = trunc i64 %.0.lcssa to i32
  ret i32 %.013
}

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4sortISt16reverse_iteratorIN9__gnu_cxx17__normal_iteratorIPiSt6vectorIiSaIiEEEEEEvT_S9_(ptr noundef, ptr noundef) local_unnamed_addr #1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE6rbeginEv(ptr dead_on_unwind noalias writable sret(%"class.std::reverse_iterator") align 8, ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEE4rendEv(ptr dead_on_unwind noalias writable sret(%"class.std::reverse_iterator") align 8, ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #2 align 2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #3

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 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!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"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LICMPass,ReassociatePass,SROAPass,SimplifyCFGPass