; LLVM IR from abhisheknaiidu/dsa :: AlgoExpert/Medium (longest-palindrome)

; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.std::initializer_list" = type { ptr, i64 }
%"class.std::allocator" = type { i8 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z20getLongestPalindromeNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEii(ptr dead_on_unwind noalias writable sret(%"class.std::vector") align 8 %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) #0 personality ptr @__gxx_personality_v0 {
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca %"class.std::initializer_list", align 8
  %10 = alloca [2 x i32], align 4
  %11 = alloca %"class.std::allocator", align 1
  %12 = alloca ptr, align 8
  %13 = alloca i32, align 4
  store ptr %0, ptr %5, align 8
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %37, %4
  %15 = load i32, ptr %7, align 4, !tbaa !9
  %16 = icmp sge i32 %15, 0
  br i1 %16, label %17, label %22

17:                                               ; preds = %14
  %18 = load i32, ptr %8, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %21 = icmp ule i64 %19, %20
  br label %22

22:                                               ; preds = %17, %14
  %23 = phi i1 [ false, %14 ], [ %21, %17 ]
  br i1 %23, label %24, label %42

24:                                               ; preds = %22
  %25 = load i32, ptr %7, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %26)
  %28 = load i8, ptr %27, align 1, !tbaa !11
  %29 = sext i8 %28 to i32
  %30 = load i32, ptr %8, 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) %1, i64 noundef %31)
  %33 = load i8, ptr %32, align 1, !tbaa !11
  %34 = sext i8 %33 to i32
  %35 = icmp ne i32 %29, %34
  br i1 %35, label %36, label %37

36:                                               ; preds = %24
  br label %42

37:                                               ; preds = %24
  %38 = load i32, ptr %7, align 4, !tbaa !9
  %39 = add nsw i32 %38, -1
  store i32 %39, ptr %7, align 4, !tbaa !9
  %40 = load i32, ptr %8, align 4, !tbaa !9
  %41 = add nsw i32 %40, 1
  store i32 %41, ptr %8, align 4, !tbaa !9
  br label %14, !llvm.loop !12

42:                                               ; preds = %36, %22
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %43 = load i32, ptr %7, align 4, !tbaa !9
  %44 = add nsw i32 %43, 1
  store i32 %44, ptr %10, align 4, !tbaa !9
  %45 = getelementptr inbounds i32, ptr %10, i64 1
  %46 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %46, ptr %45, align 4, !tbaa !9
  %47 = getelementptr inbounds %"class.std::initializer_list", ptr %9, i32 0, i32 0
  store ptr %10, ptr %47, align 8, !tbaa !14
  %48 = getelementptr inbounds %"class.std::initializer_list", ptr %9, i32 0, i32 1
  store i64 2, ptr %48, align 8, !tbaa !17
  call void @llvm.lifetime.start.p0(i64 1, ptr %11) #3
  call void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %11) #3
  %49 = getelementptr inbounds { ptr, i64 }, ptr %9, i32 0, i32 0
  %50 = load ptr, ptr %49, align 8
  %51 = getelementptr inbounds { ptr, i64 }, ptr %9, i32 0, i32 1
  %52 = load i64, ptr %51, align 8
  invoke void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr %50, i64 %52, ptr noundef nonnull align 1 dereferenceable(1) %11)
          to label %53 unwind label %54

53:                                               ; preds = %42
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %11) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  ret void

54:                                               ; preds = %42
  %55 = landingpad { ptr, i32 }
          cleanup
  %56 = extractvalue { ptr, i32 } %55, 0
  store ptr %56, ptr %12, align 8
  %57 = extractvalue { ptr, i32 } %55, 1
  store i32 %57, ptr %13, align 4
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %11) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr %11) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  br label %58

58:                                               ; preds = %54
  %59 = load ptr, ptr %12, align 8
  %60 = load i32, ptr %13, align 4
  %61 = insertvalue { ptr, i32 } poison, ptr %59, 0
  %62 = insertvalue { ptr, i32 } %61, i32 %60, 1
  resume { ptr, i32 } %62
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) #1 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) #1 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24), ptr, i64, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

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 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 #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!15, !6, i64 0}
!15 = !{!"_ZTSSt16initializer_listIiE", !6, i64 0, !16, i64 8}
!16 = !{!"long", !7, i64 0}
!17 = !{!15, !16, i64 8}


; 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::vector" = type { %"struct.std::_Vector_base" }
%"struct.std::_Vector_base" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl" = type { %"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" }
%"struct.std::_Vector_base<int, std::allocator<int>>::_Vector_impl_data" = type { ptr, ptr, ptr }
%"class.std::allocator" = type { i8 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z20getLongestPalindromeNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEii(ptr dead_on_unwind noalias writable sret(%"class.std::vector") align 8 %0, ptr noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #0 personality ptr @__gxx_personality_v0 {
  %5 = alloca [2 x i32], align 4
  %6 = alloca %"class.std::allocator", align 1
  %7 = icmp sgt i32 %2, -1
  br i1 %7, label %.lr.ph.preheader, label %.critedge

.lr.ph.preheader:                                 ; preds = %4
  %8 = zext nneg i32 %2 to i64
  %9 = sext i32 %3 to i64
  %10 = add i32 %3, %2
  %11 = add i32 %10, 1
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %18
  %indvars.iv21 = phi i64 [ %9, %.lr.ph.preheader ], [ %indvars.iv.next22, %18 ]
  %indvars.iv = phi i64 [ %8, %.lr.ph.preheader ], [ %indvars.iv.next, %18 ]
  %12 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %.not = icmp ult i64 %12, %indvars.iv21
  br i1 %.not, label %.critedge.loopexit.split.loop.exit29, label %13

13:                                               ; preds = %.lr.ph
  %14 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %indvars.iv)
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %16 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %indvars.iv21)
  %17 = load i8, ptr %16, align 1, !tbaa !5
  %.not11 = icmp eq i8 %15, %17
  br i1 %.not11, label %18, label %.critedge.loopexit.split.loop.exit26

18:                                               ; preds = %13
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %indvars.iv.next22 = add nsw i64 %indvars.iv21, 1
  %19 = icmp sgt i64 %indvars.iv, 0
  br i1 %19, label %.lr.ph, label %.critedge, !llvm.loop !8

.critedge.loopexit.split.loop.exit26:             ; preds = %13
  %20 = trunc nuw nsw i64 %indvars.iv to i32
  %21 = trunc nsw i64 %indvars.iv21 to i32
  br label %.critedge

.critedge.loopexit.split.loop.exit29:             ; preds = %.lr.ph
  %22 = trunc nuw nsw i64 %indvars.iv to i32
  %23 = trunc nsw i64 %indvars.iv21 to i32
  br label %.critedge

.critedge:                                        ; preds = %18, %.critedge.loopexit.split.loop.exit26, %.critedge.loopexit.split.loop.exit29, %4
  %.09.lcssa = phi i32 [ %3, %4 ], [ %21, %.critedge.loopexit.split.loop.exit26 ], [ %23, %.critedge.loopexit.split.loop.exit29 ], [ %11, %18 ]
  %.0.lcssa = phi i32 [ %2, %4 ], [ %20, %.critedge.loopexit.split.loop.exit26 ], [ %22, %.critedge.loopexit.split.loop.exit29 ], [ -1, %18 ]
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %5) #3
  %24 = add nsw i32 %.0.lcssa, 1
  store i32 %24, ptr %5, align 4, !tbaa !10
  %25 = getelementptr inbounds i8, ptr %5, i64 4
  store i32 %.09.lcssa, ptr %25, align 4, !tbaa !10
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %6) #3
  call void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #3
  invoke void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24) %0, ptr nonnull %5, i64 2, ptr noundef nonnull align 1 dereferenceable(1) %6)
          to label %26 unwind label %27

26:                                               ; preds = %.critedge
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  ret void

27:                                               ; preds = %.critedge
  %28 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1) %6) #3
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %5) #3
  resume { ptr, i32 } %28
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #1 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 #1 align 2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSaIiEC2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZNSt6vectorIiSaIiEEC2ESt16initializer_listIiERKS0_(ptr noundef nonnull align 8 dereferenceable(24), ptr, i64, ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #0 align 2

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local void @_ZNSt15__new_allocatorIiED2Ev(ptr noundef nonnull align 1 dereferenceable(1)) unnamed_addr #1 align 2

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 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 #2 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !6, i64 0}


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