; LLVM IR from UtkarshPathrabe/Competitive-Coding :: SPOJ Solutions/FERT21_0.ll (Z3prev)

; 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::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@_Z3arrB5cxx11 = external dso_local global [1009 x %"class.std::__cxx11::basic_string"], align 16

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8multiplyNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEi(ptr dead_on_unwind noalias writable sret(%"class.std::__cxx11::basic_string") align 8, ptr noundef, i32 noundef) #1

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

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEOS4_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef nonnull align 8 dereferenceable(32)) #0 align 2

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

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3prev() #1 personality ptr @__gxx_personality_v0 {
  %1 = alloca i32, align 4
  %2 = alloca %"class.std::__cxx11::basic_string", align 8
  %3 = alloca %"class.std::__cxx11::basic_string", align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEc(ptr noundef nonnull align 8 dereferenceable(32) @_Z3arrB5cxx11, i8 noundef signext 49)
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 1, ptr %1, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %21, %0
  %8 = load i32, ptr %1, align 4, !tbaa !5
  %9 = icmp sle i32 %8, 1000
  br i1 %9, label %11, label %10

10:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %28

11:                                               ; preds = %7
  call void @llvm.lifetime.start.p0(i64 32, ptr %2) #3
  %12 = load i32, ptr %1, align 4, !tbaa !5
  %13 = sub nsw i32 %12, 1
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [1009 x %"class.std::__cxx11::basic_string"], ptr @_Z3arrB5cxx11, i64 0, i64 %14
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2ERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %3, ptr noundef nonnull align 8 dereferenceable(32) %15)
  invoke void @_Z8multiplyNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEi(ptr dead_on_unwind writable sret(%"class.std::__cxx11::basic_string") align 8 %2, ptr noundef %3, i32 noundef 5)
          to label %16 unwind label %24

16:                                               ; preds = %11
  %17 = load i32, ptr %1, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [1009 x %"class.std::__cxx11::basic_string"], ptr @_Z3arrB5cxx11, i64 0, i64 %18
  %20 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEOS4_(ptr noundef nonnull align 8 dereferenceable(32) %19, ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %3) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr %2) #3
  br label %21

21:                                               ; preds = %16
  %22 = load i32, ptr %1, align 4, !tbaa !5
  %23 = add nsw i32 %22, 1
  store i32 %23, ptr %1, align 4, !tbaa !5
  br label %7, !llvm.loop !9

24:                                               ; preds = %11
  %25 = landingpad { ptr, i32 }
          cleanup
  %26 = extractvalue { ptr, i32 } %25, 0
  store ptr %26, ptr %4, align 8
  %27 = extractvalue { ptr, i32 } %25, 1
  store i32 %27, ptr %5, align 4
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %3) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr %2) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %29

28:                                               ; preds = %10
  ret void

29:                                               ; preds = %24
  %30 = load ptr, ptr %4, align 8
  %31 = load i32, ptr %5, align 4
  %32 = insertvalue { ptr, i32 } poison, ptr %30, 0
  %33 = insertvalue { ptr, i32 } %32, i32 %31, 1
  resume { ptr, i32 } %33
}

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEc(ptr noundef nonnull align 8 dereferenceable(32), i8 noundef signext) #1 align 2

; Function Attrs: mustprogress uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2ERKS4_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 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 = { 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 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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::__cxx11::basic_string" = type { %"struct.std::__cxx11::basic_string<char>::_Alloc_hider", i64, %union.anon }
%"struct.std::__cxx11::basic_string<char>::_Alloc_hider" = type { ptr }
%union.anon = type { i64, [8 x i8] }

@_Z3arrB5cxx11 = external dso_local global [1009 x %"class.std::__cxx11::basic_string"], align 16

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8multiplyNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEi(ptr dead_on_unwind noalias writable sret(%"class.std::__cxx11::basic_string") align 8, ptr noundef, i32 noundef) local_unnamed_addr #1

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

declare i32 @__gxx_personality_v0(...)

; Function Attrs: mustprogress nounwind uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEOS4_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; 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 uwtable
define dso_local void @_Z3prev() local_unnamed_addr #1 personality ptr @__gxx_personality_v0 {
  %1 = alloca %"class.std::__cxx11::basic_string", align 8
  %2 = alloca %"class.std::__cxx11::basic_string", align 8
  %3 = tail call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEc(ptr noundef nonnull align 8 dereferenceable(32) @_Z3arrB5cxx11, i8 noundef signext 49)
  br label %5

4:                                                ; preds = %8
  ret void

5:                                                ; preds = %0, %8
  %indvars.iv = phi i64 [ 1, %0 ], [ %indvars.iv.next, %8 ]
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %1) #3
  %6 = add nsw i64 %indvars.iv, -1
  %7 = getelementptr inbounds [1009 x %"class.std::__cxx11::basic_string"], ptr @_Z3arrB5cxx11, i64 0, i64 %6
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2ERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %2, ptr noundef nonnull align 8 dereferenceable(32) %7)
  invoke void @_Z8multiplyNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEi(ptr dead_on_unwind nonnull writable sret(%"class.std::__cxx11::basic_string") align 8 %1, ptr noundef nonnull %2, i32 noundef 5)
          to label %8 unwind label %11

8:                                                ; preds = %5
  %9 = getelementptr inbounds [1009 x %"class.std::__cxx11::basic_string"], ptr @_Z3arrB5cxx11, i64 0, i64 %indvars.iv
  %10 = call noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEOS4_(ptr noundef nonnull align 8 dereferenceable(32) %9, ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %1) #3
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 1001
  br i1 %exitcond.not, label %4, label %5, !llvm.loop !5

11:                                               ; preds = %5
  %12 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %2) #3
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %1) #3
  resume { ptr, i32 } %12
}

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(32) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEaSEc(ptr noundef nonnull align 8 dereferenceable(32), i8 noundef signext) local_unnamed_addr #1 align 2

; Function Attrs: mustprogress uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2ERKS4_(ptr noundef nonnull align 8 dereferenceable(32), ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 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 = { 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 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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,SROAPass,SimplifyCFGPass,TailCallElimPass