; LLVM IR from Tunghohin/Competitive_Coding :: Daimayuan/61.ll (Z5checkx)

; 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"

@a = external dso_local global [100010 x i64], align 16
@n = external dso_local global i32, align 4
@k = external dso_local global i64, align 8

; Function Attrs: mustprogress uwtable
define dso_local noundef zeroext i1 @_Z5checkx(i64 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i64, align 8
  %8 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %9 = load i64, ptr @k, align 8, !tbaa !5
  store i64 %9, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 1, ptr %5, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %37, %1
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = load i32, ptr @n, align 4, !tbaa !9
  %13 = icmp sle i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %10
  store i32 2, ptr %6, align 4
  br label %40

15:                                               ; preds = %10
  %16 = load i64, ptr %4, align 8, !tbaa !5
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [100010 x i64], ptr @a, i64 0, i64 %19
  %21 = load i64, ptr %20, align 8, !tbaa !5
  %22 = sub nsw i64 %17, %21
  %23 = icmp sge i64 %16, %22
  br i1 %23, label %24, label %35

24:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  store i64 0, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #3
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = load i32, ptr %5, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [100010 x i64], ptr @a, i64 0, i64 %27
  %29 = load i64, ptr %28, align 8, !tbaa !5
  %30 = sub nsw i64 %25, %29
  store i64 %30, ptr %8, align 8, !tbaa !5
  %31 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %7, ptr noundef nonnull align 8 dereferenceable(8) %8)
  %32 = load i64, ptr %31, align 8, !tbaa !5
  %33 = load i64, ptr %4, align 8, !tbaa !5
  %34 = sub nsw i64 %33, %32
  store i64 %34, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  br label %36

35:                                               ; preds = %15
  store i1 false, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %40

36:                                               ; preds = %24
  br label %37

37:                                               ; preds = %36
  %38 = load i32, ptr %5, align 4, !tbaa !9
  %39 = add nsw i32 %38, 1
  store i32 %39, ptr %5, align 4, !tbaa !9
  br label %10, !llvm.loop !11

40:                                               ; preds = %35, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  %41 = load i32, ptr %6, align 4
  switch i32 %41, label %43 [
    i32 2, label %42
  ]

42:                                               ; preds = %40
  store i1 true, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %43

43:                                               ; preds = %42, %40
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %44 = load i1, ptr %2, align 1
  ret i1 %44
}

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) #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 = { inlinehint 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 = !{!"long long", !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"

@a = external dso_local local_unnamed_addr global [100010 x i64], align 16
@n = external dso_local local_unnamed_addr global i32, align 4
@k = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checkx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = load i32, ptr @n, align 4, !tbaa !5
  %.not13 = icmp slt i32 %4, 1
  br i1 %.not13, label %.critedge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %5 = load i64, ptr @k, align 8, !tbaa !9
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %9
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next, %9 ]
  %.01014 = phi i64 [ %5, %.lr.ph.preheader ], [ %12, %9 ]
  %6 = getelementptr inbounds [100010 x i64], ptr @a, i64 0, i64 %indvars.iv
  %7 = load i64, ptr %6, align 8, !tbaa !9
  %8 = sub nsw i64 %0, %7
  %.not12.not = icmp sge i64 %.01014, %8
  br i1 %.not12.not, label %9, label %.critedge

9:                                                ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  store i64 0, ptr %2, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  store i64 %8, ptr %3, align 8, !tbaa !9
  %10 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8) %2, ptr noundef nonnull align 8 dereferenceable(8) %3)
  %11 = load i64, ptr %10, align 8, !tbaa !9
  %12 = sub nsw i64 %.01014, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr @n, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %.not.not = icmp slt i64 %indvars.iv, %14
  br i1 %.not.not, label %.lr.ph, label %.critedge, !llvm.loop !11

.critedge:                                        ; preds = %.lr.ph, %9, %1
  %.not.lcssa = phi i1 [ true, %1 ], [ %.not12.not, %9 ], [ %.not12.not, %.lr.ph ]
  ret i1 %.not.lcssa
}

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

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZSt3maxIxERKT_S2_S2_(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef nonnull align 8 dereferenceable(8)) local_unnamed_addr #2

; Function Attrs: mustprogress 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { inlinehint 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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