; LLVM IR from tangjz/acm-icpc :: luogu/2525.ll (Z5equivPiS_)

; 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"

@n = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5equivPiS_(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
  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
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %27, %2
  %9 = load i32, ptr %6, align 4, !tbaa !9
  %10 = load i32, ptr @n, align 4, !tbaa !9
  %11 = icmp sle i32 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  store i32 2, ptr %7, align 4
  br label %30

13:                                               ; preds = %8
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i32, ptr %6, align 4, !tbaa !9
  %16 = sext i32 %15 to i64
  %17 = getelementptr inbounds i32, ptr %14, i64 %16
  %18 = load i32, ptr %17, align 4, !tbaa !9
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %6, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds i32, ptr %19, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !9
  %24 = icmp ne i32 %18, %23
  br i1 %24, label %25, label %26

25:                                               ; preds = %13
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %30

26:                                               ; preds = %13
  br label %27

27:                                               ; preds = %26
  %28 = load i32, ptr %6, align 4, !tbaa !9
  %29 = add nsw i32 %28, 1
  store i32 %29, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !11

30:                                               ; preds = %25, %12
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %31 = load i32, ptr %7, align 4
  switch i32 %31, label %35 [
    i32 2, label %32
    i32 1, label %33
  ]

32:                                               ; preds = %30
  store i1 true, ptr %3, align 1
  br label %33

33:                                               ; preds = %32, %30
  %34 = load i1, ptr %3, align 1
  ret i1 %34

35:                                               ; preds = %30
  unreachable
}

; 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

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"}


; 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"

@n = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5equivPiS_(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = load i32, ptr @n, align 4, !tbaa !5
  %.not10 = icmp slt i32 %3, 1
  br i1 %.not10, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %4 = zext nneg i32 %3 to i64
  %5 = add nuw i32 %3, 1
  %wide.trip.count = zext i32 %5 to i64
  %6 = getelementptr inbounds i8, ptr %0, i64 4
  %7 = load i32, ptr %6, align 4, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %1, i64 4
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %.not915 = icmp eq i32 %7, %9
  br i1 %.not915, label %.lr.ph17, label %._crit_edge

.lr.ph17:                                         ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv16 = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %.lr.ph.preheader ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv16, 1
  %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !9

.lr.ph:                                           ; preds = %.lr.ph17
  %10 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv.next
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  %13 = load i32, ptr %12, align 4, !tbaa !5
  %.not9 = icmp eq i32 %11, %13
  br i1 %.not9, label %.lr.ph17, label %._crit_edge.loopexit, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %.lr.ph17, %.lr.ph
  %.not.le = icmp uge i64 %indvars.iv16, %4
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph.preheader, %2
  %.not.lcssa = phi i1 [ true, %2 ], [ false, %.lr.ph.preheader ], [ %.not.le, %._crit_edge.loopexit ]
  ret i1 %.not.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) 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 = !{!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"}


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