; LLVM IR from MinhasKamal/AlgorithmImplementations :: search/knuthMorrisPrattAlgorithm (KnuthMorrisPrattAlgorithm)

; 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] }

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

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) #0

; Function Attrs: mustprogress nounwind uwtable
declare void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32)) unnamed_addr #1 align 2

; 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 uwtable
define dso_local noundef i32 @_Z12KMPAlgorithmNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef %0, ptr noundef %1) #2 personality ptr @__gxx_personality_v0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca ptr, align 8
  %9 = alloca i64, align 8
  %10 = alloca %"class.std::__cxx11::basic_string", align 8
  %11 = alloca ptr, align 8
  %12 = alloca i32, align 4
  %13 = alloca i32, align 4
  %14 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 -1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #4
  %15 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #4
  %16 = trunc i64 %15 to i32
  store i32 %16, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  %17 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #4
  %18 = trunc i64 %17 to i32
  store i32 %18, ptr %7, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = zext i32 %19 to i64
  %21 = call ptr @llvm.stacksave.p0()
  store ptr %21, ptr %8, align 8
  %22 = alloca i32, i64 %20, align 16
  store i64 %20, ptr %9, align 8
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2ERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %10, ptr noundef nonnull align 8 dereferenceable(32) %1)
  invoke void @_Z15FailureFunctionNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPi(ptr noundef %10, ptr noundef %22)
          to label %23 unwind label %52

23:                                               ; preds = %2
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %10) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %13) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %14) #4
  store i32 0, ptr %14, align 4, !tbaa !9
  store i32 0, ptr %13, align 4, !tbaa !9
  br label %24

24:                                               ; preds = %81, %23
  %25 = load i32, ptr %13, align 4, !tbaa !9
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = icmp slt i32 %25, %26
  br i1 %27, label %28, label %84

28:                                               ; preds = %24
  br label %29

29:                                               ; preds = %46, %28
  %30 = load i32, ptr %14, align 4, !tbaa !9
  %31 = icmp sgt i32 %30, 0
  br i1 %31, label %32, label %44

32:                                               ; preds = %29
  %33 = load i32, ptr %14, align 4, !tbaa !9
  %34 = sext i32 %33 to i64
  %35 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %34)
  %36 = load i8, ptr %35, align 1, !tbaa !11
  %37 = sext i8 %36 to i32
  %38 = load i32, ptr %13, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %39)
  %41 = load i8, ptr %40, align 1, !tbaa !11
  %42 = sext i8 %41 to i32
  %43 = icmp ne i32 %37, %42
  br label %44

44:                                               ; preds = %32, %29
  %45 = phi i1 [ false, %29 ], [ %43, %32 ]
  br i1 %45, label %46, label %56

46:                                               ; preds = %44
  %47 = load i32, ptr %14, align 4, !tbaa !9
  %48 = sub nsw i32 %47, 1
  %49 = sext i32 %48 to i64
  %50 = getelementptr inbounds i32, ptr %22, i64 %49
  %51 = load i32, ptr %50, align 4, !tbaa !9
  store i32 %51, ptr %14, align 4, !tbaa !9
  br label %29, !llvm.loop !12

52:                                               ; preds = %2
  %53 = landingpad { ptr, i32 }
          cleanup
  %54 = extractvalue { ptr, i32 } %53, 0
  store ptr %54, ptr %11, align 8
  %55 = extractvalue { ptr, i32 } %53, 1
  store i32 %55, ptr %12, align 4
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %10) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %87

56:                                               ; preds = %44
  %57 = load i32, ptr %14, align 4, !tbaa !9
  %58 = sext i32 %57 to i64
  %59 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %58)
  %60 = load i8, ptr %59, align 1, !tbaa !11
  %61 = sext i8 %60 to i32
  %62 = load i32, ptr %13, align 4, !tbaa !9
  %63 = sext i32 %62 to i64
  %64 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %63)
  %65 = load i8, ptr %64, align 1, !tbaa !11
  %66 = sext i8 %65 to i32
  %67 = icmp eq i32 %61, %66
  br i1 %67, label %68, label %71

68:                                               ; preds = %56
  %69 = load i32, ptr %14, align 4, !tbaa !9
  %70 = add nsw i32 %69, 1
  store i32 %70, ptr %14, align 4, !tbaa !9
  br label %71

71:                                               ; preds = %68, %56
  %72 = load i32, ptr %14, align 4, !tbaa !9
  %73 = load i32, ptr %7, align 4, !tbaa !9
  %74 = icmp eq i32 %72, %73
  br i1 %74, label %75, label %80

75:                                               ; preds = %71
  %76 = load i32, ptr %13, align 4, !tbaa !9
  %77 = load i32, ptr %7, align 4, !tbaa !9
  %78 = sub nsw i32 %76, %77
  %79 = add nsw i32 %78, 1
  store i32 %79, ptr %5, align 4, !tbaa !9
  br label %84

80:                                               ; preds = %71
  br label %81

81:                                               ; preds = %80
  %82 = load i32, ptr %13, align 4, !tbaa !9
  %83 = add nsw i32 %82, 1
  store i32 %83, ptr %13, align 4, !tbaa !9
  br label %24, !llvm.loop !14

84:                                               ; preds = %75, %24
  %85 = load i32, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %14) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %13) #4
  %86 = load ptr, ptr %8, align 8
  call void @llvm.stackrestore.p0(ptr %86)
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  ret i32 %85

87:                                               ; preds = %52
  %88 = load ptr, ptr %11, align 8
  %89 = load i32, ptr %12, align 4
  %90 = insertvalue { ptr, i32 } poison, ptr %88, 0
  %91 = insertvalue { ptr, i32 } %90, i32 %89, 1
  resume { ptr, i32 } %91
}

; 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 #2 align 2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z15FailureFunctionNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPi(ptr noundef, ptr noundef) #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
declare void @llvm.stackrestore.p0(ptr) #3

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 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 willreturn }
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 = !{!"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"

%"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] }

declare i32 @__gxx_personality_v0(...)

; 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 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 uwtable
define dso_local noundef i32 @_Z12KMPAlgorithmNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef nonnull %0, ptr noundef %1) local_unnamed_addr #1 personality ptr @__gxx_personality_v0 {
  %3 = alloca %"class.std::__cxx11::basic_string", align 8
  %4 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #2
  %5 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #2
  %6 = trunc i64 %5 to i32
  %7 = and i64 %5, 4294967295
  %8 = alloca i32, i64 %7, align 16
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEC2ERKS4_(ptr noundef nonnull align 8 dereferenceable(32) %3, ptr noundef nonnull align 8 dereferenceable(32) %1)
  invoke void @_Z15FailureFunctionNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPi(ptr noundef nonnull %3, ptr noundef nonnull %8)
          to label %9 unwind label %21

9:                                                ; preds = %2
  %10 = trunc i64 %4 to i32
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %3) #2
  %11 = icmp sgt i32 %10, 0
  br i1 %11, label %.preheader.lr.ph, label %.loopexit

.preheader.lr.ph:                                 ; preds = %9
  %invariant.gep = getelementptr i8, ptr %8, i64 -4
  %wide.trip.count = and i64 %4, 2147483647
  br label %.preheader

.preheader:                                       ; preds = %.preheader.lr.ph, %34
  %indvars.iv = phi i64 [ 0, %.preheader.lr.ph ], [ %indvars.iv.next, %34 ]
  %.026 = phi i32 [ 0, %.preheader.lr.ph ], [ %spec.select, %34 ]
  %12 = icmp sgt i32 %.026, 0
  br i1 %12, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %.preheader, %18
  %.122 = phi i32 [ %19, %18 ], [ %.026, %.preheader ]
  %13 = zext nneg i32 %.122 to i64
  %14 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %13)
  %15 = load i8, ptr %14, align 1, !tbaa !5
  %16 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv)
  %17 = load i8, ptr %16, align 1, !tbaa !5
  %.not = icmp eq i8 %15, %17
  br i1 %.not, label %.critedge, label %18

18:                                               ; preds = %.lr.ph
  %gep = getelementptr i32, ptr %invariant.gep, i64 %13
  %19 = load i32, ptr %gep, align 4, !tbaa !8
  %20 = icmp sgt i32 %19, 0
  br i1 %20, label %.lr.ph, label %.critedge, !llvm.loop !10

21:                                               ; preds = %2
  %22 = landingpad { ptr, i32 }
          cleanup
  call void @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED2Ev(ptr noundef nonnull align 8 dereferenceable(32) %3) #2
  resume { ptr, i32 } %22

.critedge:                                        ; preds = %.lr.ph, %18, %.preheader
  %.1.lcssa = phi i32 [ %.026, %.preheader ], [ %19, %18 ], [ %.122, %.lr.ph ]
  %23 = sext i32 %.1.lcssa to i64
  %24 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %23)
  %25 = load i8, ptr %24, align 1, !tbaa !5
  %26 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %indvars.iv)
  %27 = load i8, ptr %26, align 1, !tbaa !5
  %28 = icmp eq i8 %25, %27
  %29 = zext i1 %28 to i32
  %spec.select = add nsw i32 %.1.lcssa, %29
  %30 = icmp eq i32 %spec.select, %6
  br i1 %30, label %31, label %34

31:                                               ; preds = %.critedge
  %32 = trunc nuw nsw i64 %indvars.iv to i32
  %reass.sub = sub i32 %32, %6
  %33 = add i32 %reass.sub, 1
  br label %.loopexit

34:                                               ; preds = %.critedge
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %.loopexit, label %.preheader, !llvm.loop !12

.loopexit:                                        ; preds = %34, %9, %31
  %.019 = phi i32 [ %33, %31 ], [ -1, %9 ], [ -1, %34 ]
  ret i32 %.019
}

; 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

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z15FailureFunctionNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPi(ptr noundef, ptr noundef) local_unnamed_addr #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) 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 = { 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 = { 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 = !{!9, !9, i64 0}
!9 = !{!"int", !6, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


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