; LLVM IR from JessonYue/LeetCodeLearning :: Array/zhanchengguo/0603 (main)

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

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z7strStr1NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef %0, ptr noundef %1) #1 {
  %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 i8, align 1
  %9 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  %10 = call noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  br i1 %10, label %11, label %12

11:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %77

12:                                               ; preds = %2
  %13 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #3
  %14 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %15 = icmp ult i64 %13, %14
  br i1 %15, label %16, label %17

16:                                               ; preds = %12
  store i32 -1, ptr %3, align 4
  br label %77

17:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %18

18:                                               ; preds = %71, %17
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sext i32 %19 to i64
  %21 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #3
  %22 = icmp ult i64 %20, %21
  br i1 %22, label %24, label %23

23:                                               ; preds = %18
  store i32 2, ptr %7, align 4
  br label %74

24:                                               ; preds = %18
  %25 = load i32, ptr %6, 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) %0, i64 noundef %26)
  %28 = load i8, ptr %27, align 1, !tbaa !11
  %29 = sext i8 %28 to i32
  %30 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef 0)
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = sext i8 %31 to i32
  %33 = icmp eq i32 %29, %32
  br i1 %33, label %34, label %70

34:                                               ; preds = %24
  call void @llvm.lifetime.start.p0(i64 1, ptr %8) #3
  store i8 1, ptr %8, align 1, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 1, ptr %9, align 4, !tbaa !9
  br label %35

35:                                               ; preds = %57, %34
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #3
  %39 = icmp ult i64 %37, %38
  br i1 %39, label %41, label %40

40:                                               ; preds = %35
  store i32 5, ptr %7, align 4
  br label %60

41:                                               ; preds = %35
  %42 = load i32, ptr %6, align 4, !tbaa !9
  %43 = load i32, ptr %9, align 4, !tbaa !9
  %44 = add nsw i32 %42, %43
  %45 = sext i32 %44 to i64
  %46 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %45)
  %47 = load i8, ptr %46, align 1, !tbaa !11
  %48 = sext i8 %47 to i32
  %49 = load i32, ptr %9, align 4, !tbaa !9
  %50 = sext i32 %49 to i64
  %51 = call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef %50)
  %52 = load i8, ptr %51, align 1, !tbaa !11
  %53 = sext i8 %52 to i32
  %54 = icmp ne i32 %48, %53
  br i1 %54, label %55, label %56

55:                                               ; preds = %41
  store i8 0, ptr %8, align 1, !tbaa !12
  store i32 5, ptr %7, align 4
  br label %60

56:                                               ; preds = %41
  br label %57

57:                                               ; preds = %56
  %58 = load i32, ptr %9, align 4, !tbaa !9
  %59 = add nsw i32 %58, 1
  store i32 %59, ptr %9, align 4, !tbaa !9
  br label %35, !llvm.loop !14

60:                                               ; preds = %55, %40
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %61

61:                                               ; preds = %60
  %62 = load i8, ptr %8, align 1, !tbaa !12, !range !16, !noundef !17
  %63 = trunc i8 %62 to i1
  br i1 %63, label %64, label %66

64:                                               ; preds = %61
  %65 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %65, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %67

66:                                               ; preds = %61
  store i32 0, ptr %7, align 4
  br label %67

67:                                               ; preds = %66, %64
  call void @llvm.lifetime.end.p0(i64 1, ptr %8) #3
  %68 = load i32, ptr %7, align 4
  switch i32 %68, label %74 [
    i32 0, label %69
  ]

69:                                               ; preds = %67
  br label %70

70:                                               ; preds = %69, %24
  br label %71

71:                                               ; preds = %70
  %72 = load i32, ptr %6, align 4, !tbaa !9
  %73 = add nsw i32 %72, 1
  store i32 %73, ptr %6, align 4, !tbaa !9
  br label %18, !llvm.loop !18

74:                                               ; preds = %67, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %75 = load i32, ptr %7, align 4
  switch i32 %75, label %79 [
    i32 2, label %76
    i32 1, label %77
  ]

76:                                               ; preds = %74
  store i32 -1, ptr %3, align 4
  br label %77

77:                                               ; preds = %76, %74, %16, %11
  %78 = load i32, ptr %3, align 4
  ret i32 %78

79:                                               ; preds = %74
  unreachable
}

; 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 noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(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

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 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 = !{!13, !13, i64 0}
!13 = !{!"bool", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = !{i8 0, i8 2}
!17 = !{}
!18 = distinct !{!18, !15}


; 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 @_Z7strStr1NSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES4_(ptr noundef %0, ptr noundef nonnull %1) local_unnamed_addr #0 {
  %3 = tail call noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #1
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %2
  %5 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %6 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #1
  %7 = icmp ult i64 %5, %6
  br i1 %7, label %.loopexit, label %.preheader23

.preheader23:                                     ; preds = %4
  %8 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %.not2229.not = icmp eq i64 %8, 0
  br i1 %.not2229.not, label %.loopexit, label %.lr.ph31

.lr.ph31:                                         ; preds = %.preheader23, %.thread
  %indvars.iv35 = phi i64 [ %indvars.iv.next36, %.thread ], [ 0, %.preheader23 ]
  %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.iv35)
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %11 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %1, i64 noundef 0)
  %12 = load i8, ptr %11, align 1, !tbaa !5
  %13 = icmp eq i8 %10, %12
  br i1 %13, label %.preheader, label %.thread

.preheader:                                       ; preds = %.lr.ph31
  %14 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #1
  %.not2026 = icmp ugt i64 %14, 1
  br i1 %.not2026, label %.lr.ph, label %.loopexit.loopexit38.split.loop.exit

15:                                               ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %16 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %1) #1
  %.not20 = icmp ugt i64 %16, %indvars.iv.next
  br i1 %.not20, label %.lr.ph, label %.loopexit.loopexit, !llvm.loop !8

.lr.ph:                                           ; preds = %.preheader, %15
  %indvars.iv = phi i64 [ %indvars.iv.next, %15 ], [ 1, %.preheader ]
  %17 = add nuw nsw i64 %indvars.iv, %indvars.iv35
  %18 = tail call noundef nonnull align 1 dereferenceable(1) ptr @_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEixEm(ptr noundef nonnull align 8 dereferenceable(32) %0, i64 noundef %17)
  %19 = load i8, ptr %18, align 1, !tbaa !5
  %20 = 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)
  %21 = load i8, ptr %20, align 1, !tbaa !5
  %.not = icmp eq i8 %19, %21
  br i1 %.not, label %15, label %.thread

.thread:                                          ; preds = %.lr.ph, %.lr.ph31
  %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
  %22 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %.not22 = icmp ugt i64 %22, %indvars.iv.next36
  br i1 %.not22, label %.lr.ph31, label %.loopexit, !llvm.loop !10

.loopexit.loopexit:                               ; preds = %15
  %23 = trunc nuw nsw i64 %indvars.iv35 to i32
  br label %.loopexit

.loopexit.loopexit38.split.loop.exit:             ; preds = %.preheader
  %24 = trunc nuw nsw i64 %indvars.iv35 to i32
  br label %.loopexit

.loopexit:                                        ; preds = %.thread, %.loopexit.loopexit38.split.loop.exit, %.loopexit.loopexit, %.preheader23, %4, %2
  %.4 = phi i32 [ 0, %2 ], [ -1, %4 ], [ -1, %.preheader23 ], [ %23, %.loopexit.loopexit ], [ %24, %.loopexit.loopexit38.split.loop.exit ], [ -1, %.thread ]
  ret i32 %.4
}

; Function Attrs: mustprogress nounwind uwtable
declare noundef zeroext i1 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE5emptyEv(ptr noundef nonnull align 8 dereferenceable(32)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE4sizeEv(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 = !{!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: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass