; LLVM IR from Ayon-SSP/The-SDE-Prep :: 3]_CP/Number Theory/Prime Factorisation Using Sieve.ll (Z11prime_sievev)

; 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"

@arr = external dso_local global [1000001 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z11prime_sievev() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  call void @llvm.memset.p0.i64(ptr align 16 @arr, i8 -1, i64 4000004, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  store i32 2, ptr %1, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %40, %0
  %5 = load i32, ptr %1, align 4, !tbaa !5
  %6 = load i32, ptr %1, align 4, !tbaa !5
  %7 = mul nsw i32 %5, %6
  %8 = icmp sle i32 %7, 1000000
  br i1 %8, label %10, label %9

9:                                                ; preds = %4
  store i32 2, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  br label %43

10:                                               ; preds = %4
  %11 = load i32, ptr %1, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds [1000001 x i32], ptr @arr, i64 0, i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  %15 = icmp eq i32 %14, -1
  br i1 %15, label %16, label %39

16:                                               ; preds = %10
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %17 = load i32, ptr %1, align 4, !tbaa !5
  store i32 %17, ptr %3, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %34, %16
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = icmp sle i32 %19, 1000000
  br i1 %20, label %22, label %21

21:                                               ; preds = %18
  store i32 5, ptr %2, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %38

22:                                               ; preds = %18
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [1000001 x i32], ptr @arr, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = icmp eq i32 %26, -1
  br i1 %27, label %28, label %33

28:                                               ; preds = %22
  %29 = load i32, ptr %1, align 4, !tbaa !5
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [1000001 x i32], ptr @arr, i64 0, i64 %31
  store i32 %29, ptr %32, align 4, !tbaa !5
  br label %33

33:                                               ; preds = %28, %22
  br label %34

34:                                               ; preds = %33
  %35 = load i32, ptr %1, align 4, !tbaa !5
  %36 = load i32, ptr %3, align 4, !tbaa !5
  %37 = add nsw i32 %36, %35
  store i32 %37, ptr %3, align 4, !tbaa !5
  br label %18, !llvm.loop !9

38:                                               ; preds = %21
  br label %39

39:                                               ; preds = %38, %10
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %1, align 4, !tbaa !5
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %1, align 4, !tbaa !5
  br label %4, !llvm.loop !11

43:                                               ; preds = %9
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

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 nounwind willreturn memory(argmem: write) }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@arr = external dso_local local_unnamed_addr global [1000001 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z11prime_sievev() local_unnamed_addr #0 {
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(4000004) @arr, i8 -1, i64 4000004, i1 false)
  br label %2

1:                                                ; preds = %.loopexit
  ret void

2:                                                ; preds = %0, %.loopexit
  %indvars.iv = phi i64 [ 2, %0 ], [ %indvars.iv.next, %.loopexit ]
  %3 = getelementptr inbounds [1000001 x i32], ptr @arr, i64 0, i64 %indvars.iv
  %4 = load i32, ptr %3, align 4, !tbaa !5
  %5 = icmp eq i32 %4, -1
  br i1 %5, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %2
  %6 = trunc nuw nsw i64 %indvars.iv to i32
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %11
  %indvars.iv15 = phi i64 [ %indvars.iv, %.lr.ph.preheader ], [ %indvars.iv.next16, %11 ]
  %7 = getelementptr inbounds [1000001 x i32], ptr @arr, i64 0, i64 %indvars.iv15
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %9 = icmp eq i32 %8, -1
  br i1 %9, label %10, label %11

10:                                               ; preds = %.lr.ph
  store i32 %6, ptr %7, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %.lr.ph, %10
  %indvars.iv.next16 = add nuw nsw i64 %indvars.iv15, %indvars.iv
  %12 = icmp ult i64 %indvars.iv.next16, 1000001
  br i1 %12, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %11, %2
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 1001
  br i1 %exitcond.not, label %1, label %2, !llvm.loop !11
}

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, 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" }
attributes #1 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }

!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"}
!11 = distinct !{!11, !10}


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