; LLVM IR from HarshCasper/NeoAlgo :: C-Plus-Plus/math/smallest_prime_factor.ll (Z25get_smallest_prime_factori)

; 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
declare dso_local noundef zeroext i1 @_Z11check_primei(i32 noundef) #0

; 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

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z25get_smallest_prime_factori(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = 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
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 3, ptr %5, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %33, %1
  %9 = load i32, ptr %5, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = mul nsw i32 %9, %10
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = icmp sle i32 %11, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %8
  store i32 2, ptr %6, align 4
  br label %36

15:                                               ; preds = %8
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = srem i32 %16, %17
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %32

20:                                               ; preds = %15
  store i32 1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = call noundef zeroext i1 @_Z11check_primei(i32 noundef %21)
  %23 = zext i1 %22 to i32
  store i32 %23, ptr %7, align 4, !tbaa !5
  %24 = load i32, ptr %7, align 4, !tbaa !5
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %26, label %28

26:                                               ; preds = %20
  %27 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %27, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %29

28:                                               ; preds = %20
  store i32 0, ptr %6, align 4
  br label %29

29:                                               ; preds = %28, %26
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  %30 = load i32, ptr %6, align 4
  switch i32 %30, label %36 [
    i32 0, label %31
  ]

31:                                               ; preds = %29
  br label %32

32:                                               ; preds = %31, %15
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %5, align 4, !tbaa !5
  %35 = add nsw i32 %34, 2
  store i32 %35, ptr %5, align 4, !tbaa !5
  br label %8, !llvm.loop !9

36:                                               ; preds = %29, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  %37 = load i32, ptr %6, align 4
  switch i32 %37, label %44 [
    i32 2, label %38
  ]

38:                                               ; preds = %36
  %39 = load i32, ptr %4, align 4, !tbaa !5
  %40 = icmp ne i32 %39, 0
  br i1 %40, label %43, label %41

41:                                               ; preds = %38
  %42 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %42, ptr %2, align 4
  store i32 1, ptr %6, align 4
  br label %44

43:                                               ; preds = %38
  unreachable

44:                                               ; preds = %41, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %45 = load i32, ptr %2, align 4
  ret i32 %45
}

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 nounwind uwtable
declare dso_local noundef zeroext i1 @_Z11check_primei(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z25get_smallest_prime_factori(i32 noundef %0) local_unnamed_addr #0 {
  %.not23 = icmp slt i32 %0, 9
  br i1 %.not23, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %6
  %.01724 = phi i32 [ %7, %6 ], [ 3, %1 ]
  %2 = urem i32 %0, %.01724
  %3 = icmp eq i32 %2, 0
  br i1 %3, label %4, label %6

4:                                                ; preds = %.lr.ph
  %5 = tail call noundef zeroext i1 @_Z11check_primei(i32 noundef %.01724)
  br i1 %5, label %._crit_edge, label %6

6:                                                ; preds = %.lr.ph, %4
  %7 = add nuw nsw i32 %.01724, 2
  %8 = mul nuw nsw i32 %7, %7
  %.not = icmp sgt i32 %8, %0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5

._crit_edge:                                      ; preds = %4, %6, %1
  %spec.select = phi i32 [ %0, %1 ], [ %0, %6 ], [ %.01724, %4 ]
  ret i32 %spec.select
}

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" }

!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: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass