; LLVM IR from chachaxw/data-structure-and-algorithm :: leetcode/two_pointers/remove_element.ll (ZN8Solution14removeElement1ERSt6vectorIiSaIiEEi)

; 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 nounwind uwtable
define dso_local noundef i32 @_ZN8Solution14removeElement1ERSt6vectorIiSaIiEEi(ptr noundef nonnull align 1 dereferenceable(1) %0, ptr noundef nonnull align 8 dereferenceable(24) %1, i32 noundef %2) #0 align 2 {
  %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
  %10 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !9
  %11 = load ptr, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %12 = load ptr, ptr %5, align 8, !tbaa !5
  %13 = call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %12) #2
  %14 = trunc i64 %13 to i32
  store i32 %14, ptr %7, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  store i32 0, ptr %8, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %56, %3
  %16 = load i32, ptr %8, align 4, !tbaa !9
  %17 = load i32, ptr %7, align 4, !tbaa !9
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  store i32 2, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  br label %59

20:                                               ; preds = %15
  %21 = load ptr, ptr %5, align 8, !tbaa !5
  %22 = load i32, ptr %8, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %21, i64 noundef %23) #2
  %25 = load i32, ptr %24, align 4, !tbaa !9
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = icmp eq i32 %25, %26
  br i1 %27, label %28, label %55

28:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #2
  %29 = load i32, ptr %8, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %10, align 4, !tbaa !9
  br label %31

31:                                               ; preds = %47, %28
  %32 = load i32, ptr %10, align 4, !tbaa !9
  %33 = load i32, ptr %7, align 4, !tbaa !9
  %34 = icmp slt i32 %32, %33
  br i1 %34, label %36, label %35

35:                                               ; preds = %31
  store i32 5, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #2
  br label %50

36:                                               ; preds = %31
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load i32, ptr %10, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %37, i64 noundef %39) #2
  %41 = load i32, ptr %40, align 4, !tbaa !9
  %42 = load ptr, ptr %5, align 8, !tbaa !5
  %43 = load i32, ptr %10, align 4, !tbaa !9
  %44 = sub nsw i32 %43, 1
  %45 = sext i32 %44 to i64
  %46 = call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %42, i64 noundef %45) #2
  store i32 %41, ptr %46, align 4, !tbaa !9
  br label %47

47:                                               ; preds = %36
  %48 = load i32, ptr %10, align 4, !tbaa !9
  %49 = add nsw i32 %48, 1
  store i32 %49, ptr %10, align 4, !tbaa !9
  br label %31, !llvm.loop !11

50:                                               ; preds = %35
  %51 = load i32, ptr %8, align 4, !tbaa !9
  %52 = add nsw i32 %51, -1
  store i32 %52, ptr %8, align 4, !tbaa !9
  %53 = load i32, ptr %7, align 4, !tbaa !9
  %54 = add nsw i32 %53, -1
  store i32 %54, ptr %7, align 4, !tbaa !9
  br label %55

55:                                               ; preds = %50, %20
  br label %56

56:                                               ; preds = %55
  %57 = load i32, ptr %8, align 4, !tbaa !9
  %58 = add nsw i32 %57, 1
  store i32 %58, ptr %8, align 4, !tbaa !9
  br label %15, !llvm.loop !13

59:                                               ; preds = %19
  %60 = load i32, ptr %7, align 4, !tbaa !9
  store i32 1, ptr %9, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %60
}

; 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 dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #0 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 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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 @_ZN8Solution14removeElement1ERSt6vectorIiSaIiEEi(ptr nocapture noundef nonnull readnone align 1 dereferenceable(1) %0, ptr noundef nonnull align 8 dereferenceable(24) %1, i32 noundef %2) local_unnamed_addr #0 align 2 {
  %4 = tail call noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %1) #1
  %5 = trunc i64 %4 to i32
  %6 = icmp sgt i32 %5, 0
  br i1 %6, label %.lr.ph27, label %._crit_edge28

._crit_edge28:                                    ; preds = %20, %3
  %.019.lcssa = phi i32 [ %5, %3 ], [ %.120, %20 ]
  ret i32 %.019.lcssa

.lr.ph27:                                         ; preds = %3, %20
  %.01825 = phi i32 [ %21, %20 ], [ 0, %3 ]
  %.01924 = phi i32 [ %.120, %20 ], [ %5, %3 ]
  %7 = sext i32 %.01825 to i64
  %8 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %7) #1
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp eq i32 %9, %2
  br i1 %10, label %.preheader, label %20

.preheader:                                       ; preds = %.lr.ph27
  %.021 = add nsw i32 %.01825, 1
  %11 = icmp slt i32 %.021, %.01924
  br i1 %11, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %.preheader
  %12 = sext i32 %.021 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %.preheader
  %13 = add nsw i32 %.01825, -1
  %14 = add nsw i32 %.01924, -1
  br label %20

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %12, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.0.in22 = phi i32 [ %.01825, %.lr.ph.preheader ], [ %19, %.lr.ph ]
  %15 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %indvars.iv) #1
  %16 = load i32, ptr %15, align 4, !tbaa !5
  %17 = sext i32 %.0.in22 to i64
  %18 = tail call noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %17) #1
  store i32 %16, ptr %18, align 4, !tbaa !5
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %19 = trunc nsw i64 %indvars.iv to i32
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond.not = icmp eq i32 %.01924, %lftr.wideiv
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

20:                                               ; preds = %.lr.ph27, %._crit_edge
  %.120 = phi i32 [ %14, %._crit_edge ], [ %.01924, %.lr.ph27 ]
  %.1 = phi i32 [ %13, %._crit_edge ], [ %.01825, %.lr.ph27 ]
  %21 = add nsw i32 %.1, 1
  %22 = icmp slt i32 %21, %.120
  br i1 %22, label %.lr.ph27, label %._crit_edge28, !llvm.loop !11
}

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIiSaIiEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 4 dereferenceable(4) ptr @_ZNSt6vectorIiSaIiEEixEm(ptr noundef nonnull align 8 dereferenceable(24), 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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