; LLVM IR from devparthgarg/Data-Structures-and-Algorithms :: 10. Strings/12 Leftmost Non Repeating Character/12a Leftmost Non Repeating Characte_fc036453/Z20leftMostNonRepeatingNSt7 (traitsIcESaIcEEE)

; 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 @_Z20leftMostNonRepeatingNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  %8 = call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #3
  %9 = trunc i64 %8 to i32
  store i32 %9, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %51, %1
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = icmp slt i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  store i32 2, ptr %6, align 4
  br label %54

15:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  store i32 0, ptr %7, align 4, !tbaa !9
  br label %16

16:                                               ; preds = %38, %15
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %20, label %41

20:                                               ; preds = %16
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = load i32, ptr %7, align 4, !tbaa !9
  %23 = icmp ne i32 %21, %22
  br i1 %23, label %24, label %37

24:                                               ; preds = %20
  %25 = load i32, ptr %5, 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 = load i32, ptr %7, 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) %0, i64 noundef %31)
  %33 = load i8, ptr %32, align 1, !tbaa !11
  %34 = sext i8 %33 to i32
  %35 = icmp eq i32 %29, %34
  br i1 %35, label %36, label %37

36:                                               ; preds = %24
  br label %41

37:                                               ; preds = %24, %20
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %7, align 4, !tbaa !9
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %7, align 4, !tbaa !9
  br label %16, !llvm.loop !12

41:                                               ; preds = %36, %16
  %42 = load i32, ptr %7, align 4, !tbaa !9
  %43 = load i32, ptr %4, align 4, !tbaa !9
  %44 = icmp eq i32 %42, %43
  br i1 %44, label %45, label %47

45:                                               ; preds = %41
  %46 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %46, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %48

47:                                               ; preds = %41
  store i32 0, ptr %6, align 4
  br label %48

48:                                               ; preds = %47, %45
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  %49 = load i32, ptr %6, align 4
  switch i32 %49, label %54 [
    i32 0, label %50
  ]

50:                                               ; preds = %48
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %5, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %5, align 4, !tbaa !9
  br label %10, !llvm.loop !14

54:                                               ; preds = %48, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  %55 = load i32, ptr %6, align 4
  switch i32 %55, label %57 [
    i32 2, label %56
  ]

56:                                               ; preds = %54
  store i32 -1, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %57

57:                                               ; preds = %56, %54
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  %58 = load i32, ptr %2, align 4
  ret i32 %58
}

; 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 i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(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

; 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 @_Z20leftMostNonRepeatingNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE(ptr noundef nonnull %0) local_unnamed_addr #0 {
  %2 = tail call noundef i64 @_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE6lengthEv(ptr noundef nonnull align 8 dereferenceable(32) %0) #1
  %3 = trunc i64 %2 to i32
  %.not2327 = icmp sgt i32 %3, 0
  br i1 %.not2327, label %.preheader.us.preheader, label %._crit_edge29

.preheader.us.preheader:                          ; preds = %1
  %wide.trip.count38 = and i64 %2, 2147483647
  br label %.preheader.us

.preheader.us:                                    ; preds = %.preheader.us.preheader, %12
  %indvars.iv35 = phi i64 [ 0, %.preheader.us.preheader ], [ %indvars.iv.next36, %12 ]
  br label %4

4:                                                ; preds = %.preheader.us, %13
  %indvars.iv = phi i64 [ 0, %.preheader.us ], [ %indvars.iv.next, %13 ]
  %.not.us = icmp eq i64 %indvars.iv35, %indvars.iv
  br i1 %.not.us, label %13, label %5

5:                                                ; preds = %4
  %6 = 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)
  %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) %0, i64 noundef %indvars.iv)
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = icmp eq i8 %7, %9
  br i1 %10, label %._crit_edge.us, label %13

._crit_edge.us:                                   ; preds = %5
  %11 = trunc nuw nsw i64 %indvars.iv to i32
  %.not22.us = icmp eq i32 %11, %3
  br i1 %.not22.us, label %._crit_edge29.loopexit.split.loop.exit43, label %12

12:                                               ; preds = %._crit_edge.us
  %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
  %exitcond39.not = icmp eq i64 %indvars.iv.next36, %wide.trip.count38
  br i1 %exitcond39.not, label %._crit_edge29, label %.preheader.us, !llvm.loop !8

13:                                               ; preds = %5, %4
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count38
  br i1 %exitcond.not, label %._crit_edge.us.thread, label %4, !llvm.loop !10

._crit_edge.us.thread:                            ; preds = %13
  %14 = trunc nuw nsw i64 %indvars.iv35 to i32
  br label %._crit_edge29

._crit_edge29.loopexit.split.loop.exit43:         ; preds = %._crit_edge.us
  %15 = trunc nuw nsw i64 %indvars.iv35 to i32
  br label %._crit_edge29

._crit_edge29:                                    ; preds = %12, %._crit_edge29.loopexit.split.loop.exit43, %._crit_edge.us.thread, %1
  %spec.select = phi i32 [ -1, %1 ], [ %14, %._crit_edge.us.thread ], [ %15, %._crit_edge29.loopexit.split.loop.exit43 ], [ -1, %12 ]
  ret i32 %spec.select
}

; 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 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,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopInstSimplifyPass,LoopRotatePass,LoopSimplifyCFGPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass