; LLVM IR from eyangch/competitive-programming :: CSES/Sorting_and_Searching/factory_machines.ll (Z5worksx)

; 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 i64, align 8
@T = external dso_local global i64, align 8
@k = external dso_local global [200000 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5worksx(i64 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 0, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  br label %7

7:                                                ; preds = %25, %1
  %8 = load i64, ptr %5, align 8, !tbaa !5
  %9 = load i64, ptr @N, align 8, !tbaa !5
  %10 = icmp slt i64 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %7
  store i32 2, ptr %6, align 4
  br label %28

12:                                               ; preds = %7
  %13 = load i64, ptr %3, align 8, !tbaa !5
  %14 = load i64, ptr %5, align 8, !tbaa !5
  %15 = getelementptr inbounds [200000 x i64], ptr @k, i64 0, i64 %14
  %16 = load i64, ptr %15, align 8, !tbaa !5
  %17 = sdiv i64 %13, %16
  %18 = load i64, ptr %4, align 8, !tbaa !5
  %19 = add nsw i64 %18, %17
  store i64 %19, ptr %4, align 8, !tbaa !5
  %20 = load i64, ptr %4, align 8, !tbaa !5
  %21 = load i64, ptr @T, align 8, !tbaa !5
  %22 = icmp sge i64 %20, %21
  br i1 %22, label %23, label %24

23:                                               ; preds = %12
  store i1 true, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %28

24:                                               ; preds = %12
  br label %25

25:                                               ; preds = %24
  %26 = load i64, ptr %5, align 8, !tbaa !5
  %27 = add nsw i64 %26, 1
  store i64 %27, ptr %5, align 8, !tbaa !5
  br label %7, !llvm.loop !9

28:                                               ; preds = %23, %11
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  %29 = load i32, ptr %6, align 4
  switch i32 %29, label %31 [
    i32 2, label %30
  ]

30:                                               ; preds = %28
  store i1 false, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %31

31:                                               ; preds = %30, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %32 = load i1, ptr %2, align 1
  ret i1 %32
}

; 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 = !{!"long long", !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 i64, align 8
@T = external dso_local local_unnamed_addr global i64, align 8
@k = external dso_local local_unnamed_addr global [200000 x i64], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z5worksx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = load i64, ptr @N, align 8, !tbaa !5
  %.not1112 = icmp sgt i64 %2, 0
  br i1 %.not1112, label %.lr.ph, label %.critedge

.lr.ph:                                           ; preds = %1
  %3 = load i64, ptr @T, align 8, !tbaa !5
  %4 = load i64, ptr @k, align 16, !tbaa !5
  %5 = sdiv i64 %0, %4
  %.not18 = icmp slt i64 %5, %3
  br i1 %.not18, label %.lr.ph20, label %.critedge

.lr.ph20:                                         ; preds = %.lr.ph, %8
  %6 = phi i64 [ %12, %8 ], [ %5, %.lr.ph ]
  %.071419 = phi i64 [ %7, %8 ], [ 0, %.lr.ph ]
  %7 = add nuw nsw i64 %.071419, 1
  %exitcond.not = icmp eq i64 %7, %2
  br i1 %exitcond.not, label %.critedge.loopexit, label %8, !llvm.loop !9

8:                                                ; preds = %.lr.ph20
  %9 = getelementptr inbounds [200000 x i64], ptr @k, i64 0, i64 %7
  %10 = load i64, ptr %9, align 8, !tbaa !5
  %11 = sdiv i64 %0, %10
  %12 = add nsw i64 %11, %6
  %.not = icmp slt i64 %12, %3
  br i1 %.not, label %.lr.ph20, label %.critedge.loopexit, !llvm.loop !9

.critedge.loopexit:                               ; preds = %8, %.lr.ph20
  %.not11.le = icmp slt i64 %7, %2
  br label %.critedge

.critedge:                                        ; preds = %.critedge.loopexit, %.lr.ph, %1
  %.not11.lcssa = phi i1 [ false, %1 ], [ true, %.lr.ph ], [ %.not11.le, %.critedge.loopexit ]
  ret i1 %.not11.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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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