; LLVM IR from JessonYue/LeetCodeLearning :: Array/linchuanxin/Algorithm/day46_0716_比较含退格的字符串 (day46_leetcode844)

; 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: nounwind uwtable
declare dso_local i32 @strlen(ptr noundef) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local i32 @returnDeleteStrLength(ptr noundef, i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @backspaceCompare(ptr noundef %0, ptr noundef %1) #0 {
  %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) #2
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = call i32 @strlen(ptr noundef %11)
  %13 = call i32 @returnDeleteStrLength(ptr noundef %10, i32 noundef %12)
  store i32 %13, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %14 = load ptr, ptr %5, align 8, !tbaa !5
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = call i32 @strlen(ptr noundef %15)
  %17 = call i32 @returnDeleteStrLength(ptr noundef %14, i32 noundef %16)
  store i32 %17, ptr %7, align 4, !tbaa !9
  %18 = load i32, ptr %6, align 4, !tbaa !9
  %19 = load i32, ptr %7, align 4, !tbaa !9
  %20 = icmp ne i32 %18, %19
  br i1 %20, label %21, label %22

21:                                               ; preds = %2
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %50

22:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  store i32 0, ptr %9, align 4, !tbaa !9
  br label %23

23:                                               ; preds = %44, %22
  %24 = load i32, ptr %9, align 4, !tbaa !9
  %25 = load i32, ptr %6, align 4, !tbaa !9
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %28, label %27

27:                                               ; preds = %23
  store i32 2, ptr %8, align 4
  br label %47

28:                                               ; preds = %23
  %29 = load ptr, ptr %4, align 8, !tbaa !5
  %30 = load i32, ptr %9, align 4, !tbaa !9
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i8, ptr %29, i64 %31
  %33 = load i8, ptr %32, align 1, !tbaa !11
  %34 = sext i8 %33 to i32
  %35 = load ptr, ptr %5, align 8, !tbaa !5
  %36 = load i32, ptr %9, align 4, !tbaa !9
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i8, ptr %35, i64 %37
  %39 = load i8, ptr %38, align 1, !tbaa !11
  %40 = sext i8 %39 to i32
  %41 = icmp ne i32 %34, %40
  br i1 %41, label %42, label %43

42:                                               ; preds = %28
  store i1 false, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %47

43:                                               ; preds = %28
  br label %44

44:                                               ; preds = %43
  %45 = load i32, ptr %9, align 4, !tbaa !9
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %9, align 4, !tbaa !9
  br label %23, !llvm.loop !12

47:                                               ; preds = %42, %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  %48 = load i32, ptr %8, align 4
  switch i32 %48, label %50 [
    i32 2, label %49
  ]

49:                                               ; preds = %47
  store i1 true, ptr %3, align 1
  store i32 1, ptr %8, align 4
  br label %50

50:                                               ; preds = %49, %47, %21
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %51 = load i1, ptr %3, align 1
  ret i1 %51
}

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 = { 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/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 @strlen(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local i32 @returnDeleteStrLength(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 i32 @strlen(ptr noundef %0)
  %4 = tail call i32 @returnDeleteStrLength(ptr noundef %0, i32 noundef %3)
  %5 = tail call i32 @strlen(ptr noundef %1)
  %6 = tail call i32 @returnDeleteStrLength(ptr noundef %1, i32 noundef %5)
  %.not = icmp eq i32 %4, %6
  br i1 %.not, label %.preheader, label %.loopexit

.preheader:                                       ; preds = %2
  %.not1819 = icmp slt i32 %4, 1
  br i1 %.not1819, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %7 = zext nneg i32 %4 to i64
  %wide.trip.count = zext nneg i32 %4 to i64
  br label %.lr.ph

8:                                                ; 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, %8
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %8 ]
  %9 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  %10 = load i8, ptr %9, align 1, !tbaa !7
  %11 = getelementptr inbounds i8, ptr %1, i64 %indvars.iv
  %12 = load i8, ptr %11, align 1, !tbaa !7
  %.not17 = icmp eq i8 %10, %12
  br i1 %.not17, label %8, label %.loopexit

.loopexit.loopexit.split.loop.exit:               ; preds = %8
  %.not18.le = icmp uge i64 %indvars.iv.next, %7
  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
}

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" }

!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