; LLVM IR from Lakhankumawat/LearnCPP :: A-Array (CountingDivisibleSubstrings)

; 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"

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z6helperRNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEi(ptr noundef nonnull align 8 dereferenceable(32) %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %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 ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %49, %2
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %13) #3
  %15 = icmp ult i64 %12, %14
  br i1 %15, label %17, label %16

16:                                               ; preds = %10
  store i32 2, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %52

17:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %18 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %18, ptr %9, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %45, %17
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %22) #3
  %24 = icmp ult i64 %21, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %19
  store i32 5, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %48

26:                                               ; preds = %19
  %27 = load i32, ptr %8, align 4, !tbaa !9
  %28 = mul nsw i32 %27, 10
  %29 = load ptr, ptr %3, align 8, !tbaa !5
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %31 = sext i32 %30 to i64
  %32 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %29, i64 noundef %31)
  %33 = load i8, ptr %32, align 1, !tbaa !11
  %34 = sext i8 %33 to i32
  %35 = add nsw i32 %28, %34
  %36 = sub nsw i32 %35, 48
  store i32 %36, ptr %8, align 4, !tbaa !9
  %37 = load i32, ptr %8, align 4, !tbaa !9
  %38 = load i32, ptr %4, align 4, !tbaa !9
  %39 = srem i32 %37, %38
  %40 = icmp eq i32 %39, 0
  br i1 %40, label %41, label %44

41:                                               ; preds = %26
  %42 = load i32, ptr %5, align 4, !tbaa !9
  %43 = add nsw i32 %42, 1
  store i32 %43, ptr %5, align 4, !tbaa !9
  br label %44

44:                                               ; preds = %41, %26
  br label %45

45:                                               ; preds = %44
  %46 = load i32, ptr %9, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %9, align 4, !tbaa !9
  br label %19, !llvm.loop !12

48:                                               ; preds = %25
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %49

49:                                               ; preds = %48
  %50 = load i32, ptr %6, align 4, !tbaa !9
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr %6, align 4, !tbaa !9
  br label %10, !llvm.loop !14

52:                                               ; preds = %16
  %53 = load i32, ptr %5, align 4, !tbaa !9
  store i32 1, ptr %7, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %53
}

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

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) #2 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 = { 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 = { 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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"

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z6helperRNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEi(ptr noundef nonnull align 8 dereferenceable(32) %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %.not = icmp eq i64 %3, 0
  br i1 %.not, label %._crit_edge22, label %.preheader

.preheader:                                       ; preds = %2, %._crit_edge
  %indvars.iv = phi i64 [ %indvars.iv.next, %._crit_edge ], [ 0, %2 ]
  %.01520 = phi i32 [ %.1.lcssa, %._crit_edge ], [ 0, %2 ]
  %4 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %5 = icmp ugt i64 %4, %indvars.iv
  br i1 %5, label %.lr.ph, label %._crit_edge

._crit_edge22:                                    ; preds = %._crit_edge, %2
  %.015.lcssa = phi i32 [ 0, %2 ], [ %.1.lcssa, %._crit_edge ]
  ret i32 %.015.lcssa

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %.1.lcssa = phi i32 [ %.01520, %.preheader ], [ %spec.select, %.lr.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %6 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %7 = icmp ugt i64 %6, %indvars.iv.next
  br i1 %7, label %.preheader, label %._crit_edge22, !llvm.loop !5

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv24 = phi i64 [ %indvars.iv.next25, %.lr.ph ], [ %indvars.iv, %.preheader ]
  %.01318 = phi i32 [ %13, %.lr.ph ], [ 0, %.preheader ]
  %.117 = phi i32 [ %spec.select, %.lr.ph ], [ %.01520, %.preheader ]
  %8 = mul nsw i32 %.01318, 10
  %9 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv24)
  %10 = load i8, ptr %9, align 1, !tbaa !7
  %11 = sext i8 %10 to i32
  %12 = add i32 %8, -48
  %13 = add i32 %12, %11
  %14 = srem i32 %13, %1
  %15 = icmp eq i32 %14, 0
  %16 = zext i1 %15 to i32
  %spec.select = add nsw i32 %.117, %16
  %indvars.iv.next25 = add nuw nsw i64 %indvars.iv24, 1
  %17 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %18 = icmp ugt i64 %17, %indvars.iv.next25
  br i1 %18, label %.lr.ph, label %._crit_edge, !llvm.loop !10
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32), i64 noundef) local_unnamed_addr #0 align 2

attributes #0 = { 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 #1 = { 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = distinct !{!10, !6}


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