; LLVM IR from lzyrapx/Competitive-Programming :: 51Nod/1106（质数筛）.ll (Z5checki)

; 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: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z5checki(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
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp sle i32 %6, 1
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  store i1 false, ptr %2, align 1
  br label %39

9:                                                ; preds = %1
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = icmp sle i32 %10, 3
  br i1 %11, label %12, label %13

12:                                               ; preds = %9
  store i1 true, ptr %2, align 1
  br label %39

13:                                               ; preds = %9
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = srem i32 %14, 2
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %18

17:                                               ; preds = %13
  store i1 false, ptr %2, align 1
  br label %39

18:                                               ; preds = %13
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 3, ptr %4, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %33, %18
  %20 = load i32, ptr %4, align 4, !tbaa !5
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = mul nsw i32 %20, %21
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = icmp sle i32 %22, %23
  br i1 %24, label %26, label %25

25:                                               ; preds = %19
  store i32 2, ptr %5, align 4
  br label %36

26:                                               ; preds = %19
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = load i32, ptr %4, align 4, !tbaa !5
  %29 = srem i32 %27, %28
  %30 = icmp eq i32 %29, 0
  br i1 %30, label %31, label %32

31:                                               ; preds = %26
  store i1 false, ptr %2, align 1
  store i32 1, ptr %5, align 4
  br label %36

32:                                               ; preds = %26
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %4, align 4, !tbaa !5
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %4, align 4, !tbaa !5
  br label %19, !llvm.loop !9

36:                                               ; preds = %31, %25
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %37 = load i32, ptr %5, align 4
  switch i32 %37, label %41 [
    i32 2, label %38
    i32 1, label %39
  ]

38:                                               ; preds = %36
  store i1 true, ptr %2, align 1
  br label %39

39:                                               ; preds = %38, %36, %17, %12, %8
  %40 = load i1, ptr %2, align 1
  ret i1 %40

41:                                               ; preds = %36
  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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef zeroext i1 @_Z5checki(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp slt i32 %0, 2
  br i1 %2, label %.loopexit, label %3

3:                                                ; preds = %1
  %4 = icmp ult i32 %0, 4
  br i1 %4, label %.loopexit, label %5

5:                                                ; preds = %3
  %6 = and i32 %0, 1
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %5
  %.not13 = icmp ult i32 %0, 9
  br i1 %.not13, label %.loopexit, label %.lr.ph

8:                                                ; preds = %.lr.ph
  %9 = add nuw nsw i32 %.01014, 1
  %10 = mul nuw nsw i32 %9, %9
  %.not = icmp sgt i32 %10, %0
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.lr.ph:                                           ; preds = %.preheader, %8
  %.01014 = phi i32 [ %9, %8 ], [ 3, %.preheader ]
  %11 = urem i32 %0, %.01014
  %.not17 = icmp ne i32 %11, 0
  br i1 %.not17, label %8, label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %8, %.preheader, %5, %3, %1
  %.1 = phi i1 [ false, %1 ], [ true, %3 ], [ false, %5 ], [ true, %.preheader ], [ %.not17, %8 ], [ %.not17, %.lr.ph ]
  ret i1 %.1
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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