; LLVM IR from eyangch/competitive-programming :: Codeforces/1156/c.ll (Z5worksi)

; 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
@Z = external dso_local global i32, align 4
@x = external dso_local global [200000 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5worksi(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %29, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp slt i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %32

11:                                               ; preds = %6
  %12 = load i32, ptr @N, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = sub nsw i32 %12, %13
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = add nsw i32 %14, %15
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [200000 x i32], ptr @x, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [200000 x i32], ptr @x, i64 0, i64 %21
  %23 = load i32, ptr %22, align 4, !tbaa !5
  %24 = sub nsw i32 %19, %23
  %25 = load i32, ptr @Z, align 4, !tbaa !5
  %26 = icmp slt i32 %24, %25
  br i1 %26, label %27, label %28

27:                                               ; preds = %11
  store i1 false, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %32

28:                                               ; preds = %11
  br label %29

29:                                               ; preds = %28
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !9

32:                                               ; preds = %27, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %33 = load i32, ptr %5, align 4
  switch i32 %33, label %37 [
    i32 2, label %34
    i32 1, label %35
  ]

34:                                               ; preds = %32
  store i1 true, ptr %2, align 1
  br label %35

35:                                               ; preds = %34, %32
  %36 = load i1, ptr %2, align 1
  ret i1 %36

37:                                               ; preds = %32
  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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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
@Z = external dso_local local_unnamed_addr global i32, align 4
@x = external dso_local local_unnamed_addr global [200000 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5worksi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 1
  br i1 %2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1
  %3 = load i32, ptr @N, align 4, !tbaa !5
  %4 = load i32, ptr @Z, align 4, !tbaa !5
  %5 = zext nneg i32 %0 to i64
  %wide.trip.count = zext nneg i32 %0 to i64
  %6 = sub i32 %3, %0
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [200000 x i32], ptr @x, i64 0, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = load i32, ptr @x, align 16, !tbaa !5
  %11 = sub nsw i32 %9, %10
  %12 = icmp slt i32 %11, %4
  br i1 %12, label %._crit_edge, label %.lr.ph14

.lr.ph14:                                         ; preds = %.lr.ph, %13
  %indvars.iv13 = phi i64 [ %indvars.iv.next, %13 ], [ 0, %.lr.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv13, 1
  %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond, label %._crit_edge.loopexit, label %13, !llvm.loop !9

13:                                               ; preds = %.lr.ph14
  %14 = trunc nuw nsw i64 %indvars.iv.next to i32
  %15 = sub i32 %14, %0
  %16 = add i32 %15, %3
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [200000 x i32], ptr @x, i64 0, i64 %17
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %20 = getelementptr inbounds [200000 x i32], ptr @x, i64 0, i64 %indvars.iv.next
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = sub nsw i32 %19, %21
  %23 = icmp slt i32 %22, %4
  br i1 %23, label %._crit_edge.loopexit, label %.lr.ph14, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %.lr.ph14, %13
  %24 = icmp uge i64 %indvars.iv.next, %5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.lr.ph, %1
  %.lcssa = phi i1 [ true, %1 ], [ false, %.lr.ph ], [ %24, %._crit_edge.loopexit ]
  ret i1 %.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, 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,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass