; LLVM IR from JessonYue/LeetCodeLearning :: Array/zhangjunwei/7.13-7.18 (backspaceCompare)

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

; Function Attrs: nounwind uwtable
declare dso_local i32 @deletebackspace(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @backspaceCompare(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i1, align 1
  %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
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = call i64 @strlen(ptr noundef %11) #4
  %13 = trunc i64 %12 to i32
  %14 = call i32 @deletebackspace(ptr noundef %10, i32 noundef %13)
  store i32 %14, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = load ptr, ptr %5, align 8, !tbaa !5
  %17 = call i64 @strlen(ptr noundef %16) #4
  %18 = trunc i64 %17 to i32
  %19 = call i32 @deletebackspace(ptr noundef %15, i32 noundef %18)
  store i32 %19, ptr %7, align 4, !tbaa !9
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = icmp ne i32 %20, %21
  br i1 %22, label %23, label %24

23:                                               ; preds = %2
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %52

24:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %25

25:                                               ; preds = %46, %24
  %26 = load i32, ptr %9, align 4, !tbaa !9
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = icmp slt i32 %26, %27
  br i1 %28, label %30, label %29

29:                                               ; preds = %25
  store i32 2, ptr %8, align 4
  br label %49

30:                                               ; preds = %25
  %31 = load ptr, ptr %4, align 8, !tbaa !5
  %32 = load i32, ptr %9, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds i8, ptr %31, i64 %33
  %35 = load i8, ptr %34, align 1, !tbaa !11
  %36 = sext i8 %35 to i32
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load i32, ptr %9, align 4, !tbaa !9
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds i8, ptr %37, i64 %39
  %41 = load i8, ptr %40, align 1, !tbaa !11
  %42 = sext i8 %41 to i32
  %43 = icmp ne i32 %36, %42
  br i1 %43, label %44, label %45

44:                                               ; preds = %30
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %49

45:                                               ; preds = %30
  br label %46

46:                                               ; preds = %45
  %47 = load i32, ptr %9, align 4, !tbaa !9
  %48 = add nsw i32 %47, 1
  store i32 %48, ptr %9, align 4, !tbaa !9
  br label %25, !llvm.loop !12

49:                                               ; preds = %44, %29
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  %50 = load i32, ptr %8, align 4
  switch i32 %50, label %52 [
    i32 2, label %51
  ]

51:                                               ; preds = %49
  store i1 true, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %52

52:                                               ; preds = %51, %49, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %53 = load i1, ptr %3, align 1
  ret i1 %53
}

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { nounwind willreturn memory(read) "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 }
attributes #4 = { nounwind willreturn memory(read) }

!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/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"}


; 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: nounwind uwtable
declare dso_local i32 @deletebackspace(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @backspaceCompare(ptr noundef %0, ptr noundef %1) local_unnamed_addr #0 {
  %3 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #2
  %4 = trunc i64 %3 to i32
  %5 = tail call i32 @deletebackspace(ptr noundef %0, i32 noundef %4)
  %6 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %1) #2
  %7 = trunc i64 %6 to i32
  %8 = tail call i32 @deletebackspace(ptr noundef %1, i32 noundef %7)
  %.not = icmp eq i32 %5, %8
  br i1 %.not, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %2
  %.not1819 = icmp slt i32 %5, 1
  br i1 %.not1819, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %9 = zext nneg i32 %5 to i64
  %wide.trip.count = zext nneg i32 %5 to i64
  br label %.lr.ph

10:                                               ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond, label %.loopexit.loopexit.split.loop.exit, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %.lr.ph.preheader, %10
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %10 ]
  %11 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %12 = load i8, ptr %11, align 1, !tbaa !7
  %13 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %14 = load i8, ptr %13, align 1, !tbaa !7
  %.not17 = icmp eq i8 %12, %14
  br i1 %.not17, label %10, label %.loopexit

.loopexit.loopexit.split.loop.exit:               ; preds = %10
  %.not18.le = icmp uge i64 %indvars.iv.next, %9
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %.loopexit.loopexit.split.loop.exit, %.preheader, %2
  %.1 = phi i1 [ false, %2 ], [ true, %.preheader ], [ %.not18.le, %.loopexit.loopexit.split.loop.exit ], [ false, %.lr.ph ]
  ret i1 %.1
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #1

attributes #0 = { 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 nofree nounwind willreturn memory(argmem: read) "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 willreturn memory(read) }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}
!7 = !{!8, !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}


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