; LLVM IR from div-bargali/Data-Structures-and-Algorithms :: C++/Algorithms/Mathematical/Sieve of eratosthenes.ll (Z19SieveOfEratosthenesi)

; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z19SieveOfEratosthenesi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = add nsw i32 %9, 1
  %11 = zext i32 %10 to i64
  %12 = call ptr @llvm.stacksave.p0()
  store ptr %12, ptr %3, align 8
  %13 = alloca i8, i64 %11, align 16
  store i64 %11, ptr %4, align 8
  call void @llvm.memset.p0.i64(ptr align 16 %13, i8 1, i64 %11, i1 false)
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #6
  store i32 2, ptr %5, align 4, !tbaa !5
  br label %14

14:                                               ; preds = %48, %1
  %15 = load i32, ptr %5, align 4, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = mul nsw i32 %15, %16
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %14
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #6
  br label %51

21:                                               ; preds = %14
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i8, ptr %13, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !9, !range !11, !noundef !12
  %26 = trunc i8 %25 to i1
  %27 = zext i1 %26 to i32
  %28 = icmp eq i32 %27, 1
  br i1 %28, label %29, label %47

29:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #6
  %30 = load i32, ptr %5, align 4, !tbaa !5
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = mul nsw i32 %30, %31
  store i32 %32, ptr %7, align 4, !tbaa !5
  br label %33

33:                                               ; preds = %42, %29
  %34 = load i32, ptr %7, align 4, !tbaa !5
  %35 = load i32, ptr %2, align 4, !tbaa !5
  %36 = icmp sle i32 %34, %35
  br i1 %36, label %38, label %37

37:                                               ; preds = %33
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #6
  br label %46

38:                                               ; preds = %33
  %39 = load i32, ptr %7, align 4, !tbaa !5
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds i8, ptr %13, i64 %40
  store i8 0, ptr %41, align 1, !tbaa !9
  br label %42

42:                                               ; preds = %38
  %43 = load i32, ptr %5, align 4, !tbaa !5
  %44 = load i32, ptr %7, align 4, !tbaa !5
  %45 = add nsw i32 %44, %43
  store i32 %45, ptr %7, align 4, !tbaa !5
  br label %33, !llvm.loop !13

46:                                               ; preds = %37
  br label %47

47:                                               ; preds = %46, %21
  br label %48

48:                                               ; preds = %47
  %49 = load i32, ptr %5, align 4, !tbaa !5
  %50 = add nsw i32 %49, 1
  store i32 %50, ptr %5, align 4, !tbaa !5
  br label %14, !llvm.loop !15

51:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #6
  store i32 2, ptr %8, align 4, !tbaa !5
  br label %52

52:                                               ; preds = %68, %51
  %53 = load i32, ptr %8, align 4, !tbaa !5
  %54 = load i32, ptr %2, align 4, !tbaa !5
  %55 = icmp sle i32 %53, %54
  br i1 %55, label %57, label %56

56:                                               ; preds = %52
  store i32 8, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #6
  br label %71

57:                                               ; preds = %52
  %58 = load i32, ptr %8, align 4, !tbaa !5
  %59 = sext i32 %58 to i64
  %60 = getelementptr inbounds i8, ptr %13, i64 %59
  %61 = load i8, ptr %60, align 1, !tbaa !9, !range !11, !noundef !12
  %62 = trunc i8 %61 to i1
  br i1 %62, label %63, label %67

63:                                               ; preds = %57
  %64 = load i32, ptr %8, align 4, !tbaa !5
  %65 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %64)
  %66 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %65, ptr noundef @.str)
  br label %67

67:                                               ; preds = %63, %57
  br label %68

68:                                               ; preds = %67
  %69 = load i32, ptr %8, align 4, !tbaa !5
  %70 = add nsw i32 %69, 1
  store i32 %70, ptr %8, align 4, !tbaa !5
  br label %52, !llvm.loop !16

71:                                               ; preds = %56
  %72 = load ptr, ptr %3, align 8
  call void @llvm.stackrestore.p0(ptr %72)
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #1

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #3

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #4

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #5

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #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 }
attributes #2 = { nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #4 = { inlinehint 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 #5 = { "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 #6 = { 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 = !{!"bool", !7, i64 0}
!11 = !{i8 0, i8 2}
!12 = !{}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}
!15 = distinct !{!15, !14}
!16 = distinct !{!16, !14}


; 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"

%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }

@_ZSt4cout = external global %"class.std::basic_ostream", align 8
@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: mustprogress uwtable
define dso_local void @_Z19SieveOfEratosthenesi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = add i32 %0, 1
  %3 = zext i32 %2 to i64
  %4 = alloca i8, i64 %3, align 16
  call void @llvm.memset.p0.i64(ptr nonnull align 16 %4, i8 1, i64 %3, i1 false)
  %.not27 = icmp slt i32 %0, 4
  br i1 %.not27, label %.preheader, label %.lr.ph29

.preheader:                                       ; preds = %.loopexit, %1
  %.not2230 = icmp slt i32 %0, 2
  br i1 %.not2230, label %._crit_edge, label %.lr.ph32

.lr.ph29:                                         ; preds = %1, %.loopexit
  %indvars.iv = phi i64 [ %indvars.iv.next, %.loopexit ], [ 2, %1 ]
  %5 = phi i32 [ %13, %.loopexit ], [ 4, %1 ]
  %6 = getelementptr inbounds i8, ptr %4, i64 %indvars.iv
  %7 = load i8, ptr %6, align 1, !tbaa !5, !range !9, !noundef !10
  %8 = trunc nuw i8 %7 to i1
  %.not2325 = icmp sle i32 %5, %0
  %or.cond.not = and i1 %.not2325, %8
  br i1 %or.cond.not, label %.lr.ph.preheader, label %.loopexit

.lr.ph.preheader:                                 ; preds = %.lr.ph29
  %9 = zext nneg i32 %5 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv34 = phi i64 [ %9, %.lr.ph.preheader ], [ %indvars.iv.next35, %.lr.ph ]
  %10 = getelementptr inbounds i8, ptr %4, i64 %indvars.iv34
  store i8 0, ptr %10, align 1, !tbaa !5
  %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, %indvars.iv
  %11 = trunc nuw i64 %indvars.iv.next35 to i32
  %.not23 = icmp sgt i32 %11, %0
  br i1 %.not23, label %.loopexit, label %.lr.ph, !llvm.loop !11

.loopexit:                                        ; preds = %.lr.ph, %.lr.ph29
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %12 = mul nuw nsw i64 %indvars.iv.next, %indvars.iv.next
  %13 = trunc nuw i64 %12 to i32
  %.not = icmp sgt i32 %13, %0
  br i1 %.not, label %.preheader, label %.lr.ph29, !llvm.loop !13

._crit_edge:                                      ; preds = %21, %.preheader
  ret void

.lr.ph32:                                         ; preds = %.preheader, %21
  %indvars.iv38 = phi i64 [ %indvars.iv.next39, %21 ], [ 2, %.preheader ]
  %14 = getelementptr inbounds i8, ptr %4, i64 %indvars.iv38
  %15 = load i8, ptr %14, align 1, !tbaa !5, !range !9, !noundef !10
  %16 = trunc nuw i8 %15 to i1
  br i1 %16, label %17, label %21

17:                                               ; preds = %.lr.ph32
  %18 = trunc nuw nsw i64 %indvars.iv38 to i32
  %19 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %18)
  %20 = tail call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) %19, ptr noundef nonnull @.str)
  br label %21

21:                                               ; preds = %.lr.ph32, %17
  %indvars.iv.next39 = add nuw nsw i64 %indvars.iv38, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next39, %3
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph32, !llvm.loop !14
}

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

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #2

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #3

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 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }
attributes #2 = { inlinehint 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 #3 = { "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 = !{!"bool", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{i8 0, i8 2}
!10 = !{}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}
!14 = distinct !{!14, !12}


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