; LLVM IR from smv1999/CompetitiveProgrammingQuestionBank :: Strings (substring_index)

; 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 @_Z11isSubstringNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %64, %2
  %11 = load i32, ptr %8, align 4, !tbaa !9
  %12 = sext i32 %11 to i64
  %13 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %12)
  %14 = load i8, ptr %13, align 1, !tbaa !11
  %15 = sext i8 %14 to i32
  %16 = icmp ne i32 %15, 0
  br i1 %16, label %18, label %17

17:                                               ; preds = %10
  store i32 2, ptr %9, align 4
  br label %67

18:                                               ; preds = %10
  store i32 0, ptr %7, align 4, !tbaa !9
  %19 = load i32, ptr %8, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %20)
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = sext i8 %22 to i32
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %25)
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = sext i8 %27 to i32
  %29 = icmp eq i32 %23, %28
  br i1 %29, label %30, label %63

30:                                               ; preds = %18
  %31 = load i32, ptr %8, align 4, !tbaa !9
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %6, align 4, !tbaa !9
  br label %33

33:                                               ; preds = %45, %30
  %34 = load i32, ptr %8, align 4, !tbaa !9
  %35 = sext i32 %34 to i64
  %36 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %35)
  %37 = load i8, ptr %36, align 1, !tbaa !11
  %38 = sext i8 %37 to i32
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = sext i32 %39 to i64
  %41 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %40)
  %42 = load i8, ptr %41, align 1, !tbaa !11
  %43 = sext i8 %42 to i32
  %44 = icmp eq i32 %38, %43
  br i1 %44, label %45, label %50

45:                                               ; preds = %33
  %46 = load i32, ptr %8, align 4, !tbaa !9
  %47 = add nsw i32 %46, 1
  store i32 %47, ptr %8, align 4, !tbaa !9
  %48 = load i32, ptr %7, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %7, align 4, !tbaa !9
  br label %33, !llvm.loop !12

50:                                               ; preds = %33
  %51 = load i32, ptr %7, align 4, !tbaa !9
  %52 = sext i32 %51 to i64
  %53 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %52)
  %54 = load i8, ptr %53, align 1, !tbaa !11
  %55 = sext i8 %54 to i32
  %56 = icmp eq i32 %55, 0
  br i1 %56, label %57, label %60

57:                                               ; preds = %50
  %58 = load i32, ptr %6, align 4, !tbaa !9
  %59 = sub nsw i32 %58, 1
  store i32 %59, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %67

60:                                               ; preds = %50
  %61 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %61, ptr %8, align 4, !tbaa !9
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %62

62:                                               ; preds = %60
  br label %63

63:                                               ; preds = %62, %18
  br label %64

64:                                               ; preds = %63
  %65 = load i32, ptr %8, align 4, !tbaa !9
  %66 = add nsw i32 %65, 1
  store i32 %66, ptr %8, align 4, !tbaa !9
  br label %10, !llvm.loop !14

67:                                               ; preds = %57, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  %68 = load i32, ptr %9, align 4
  switch i32 %68, label %74 [
    i32 2, label %69
  ]

69:                                               ; preds = %67
  %70 = load i32, ptr %6, align 4, !tbaa !9
  %71 = icmp eq i32 %70, 0
  br i1 %71, label %72, label %73

72:                                               ; preds = %69
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %9, align 4
  br label %74

73:                                               ; preds = %69
  unreachable

74:                                               ; preds = %72, %67
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %75 = load i32, ptr %3, align 4
  ret i32 %75
}

; 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 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 @_Z11isSubstringNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef nonnull %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef 0)
  %4 = load i8, ptr %3, align 1, !tbaa !5
  %.not24 = icmp eq i8 %4, 0
  br i1 %.not24, label %._crit_edge28, label %.lr.ph27

.lr.ph27:                                         ; preds = %2, %27
  %5 = phi i64 [ %29, %27 ], [ 0, %2 ]
  %.01525 = phi i32 [ %28, %27 ], [ 0, %2 ]
  %6 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %5)
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %8 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef 0)
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = icmp eq i8 %7, %9
  br i1 %10, label %11, label %27

11:                                               ; preds = %.lr.ph27
  %12 = add nsw i32 %.01525, 1
  %13 = sext i32 %.01525 to i64
  %14 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %13)
  %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 0)
  %17 = load i8, ptr %16, align 1, !tbaa !5
  %18 = icmp eq i8 %15, %17
  br i1 %18, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %11, %.lr.ph
  %indvars.iv33 = phi i64 [ %indvars.iv.next34, %.lr.ph ], [ 0, %11 ]
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ %13, %11 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %indvars.iv.next34 = add nuw nsw i64 %indvars.iv33, 1
  %19 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv.next)
  %20 = load i8, ptr %19, align 1, !tbaa !5
  %21 = 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.next34)
  %22 = load i8, ptr %21, align 1, !tbaa !5
  %23 = icmp eq i8 %20, %22
  br i1 %23, label %.lr.ph, label %._crit_edge, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %11
  %.lcssa = phi i64 [ 0, %11 ], [ %indvars.iv.next34, %.lr.ph ]
  %24 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %.lcssa)
  %25 = load i8, ptr %24, align 1, !tbaa !5
  %26 = icmp eq i8 %25, 0
  br i1 %26, label %._crit_edge28, label %27

27:                                               ; preds = %._crit_edge, %.lr.ph27
  %.2 = phi i32 [ %.01525, %.lr.ph27 ], [ %12, %._crit_edge ]
  %28 = add nsw i32 %.2, 1
  %29 = sext i32 %28 to i64
  %30 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %29)
  %31 = load i8, ptr %30, align 1, !tbaa !5
  %.not = icmp eq i8 %31, 0
  br i1 %.not, label %._crit_edge28, label %.lr.ph27, !llvm.loop !10

._crit_edge28:                                    ; preds = %27, %._crit_edge, %2
  %spec.select = phi i32 [ -1, %2 ], [ %.01525, %._crit_edge ], [ -1, %27 ]
  ret i32 %spec.select
}

; 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" }

!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 = distinct !{!10, !9}


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