; LLVM IR from HarshCasper/NeoAlgo :: C/math (happy_number)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

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

7:                                                ; preds = %29, %1
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = icmp ne i32 %8, 1
  br i1 %9, label %10, label %13

10:                                               ; preds = %7
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = icmp ne i32 %11, 4
  br label %13

13:                                               ; preds = %10, %7
  %14 = phi i1 [ false, %7 ], [ %12, %10 ]
  br i1 %14, label %15, label %31

15:                                               ; preds = %13
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %19, %15
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %29

19:                                               ; preds = %16
  %20 = load i32, ptr %3, align 4, !tbaa !5
  %21 = srem i32 %20, 10
  store i32 %21, ptr %5, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = mul nsw i32 %22, %23
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = add nsw i32 %25, %24
  store i32 %26, ptr %4, align 4, !tbaa !5
  %27 = load i32, ptr %3, align 4, !tbaa !5
  %28 = sdiv i32 %27, 10
  store i32 %28, ptr %3, align 4, !tbaa !5
  br label %16, !llvm.loop !9

29:                                               ; preds = %16
  %30 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %30, ptr %3, align 4, !tbaa !5
  br label %7, !llvm.loop !11

31:                                               ; preds = %13
  %32 = load i32, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %32
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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/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"

; Function Attrs: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local noundef i32 @happy_number(i32 noundef %0) local_unnamed_addr #0 {
  br label %2

.loopexit:                                        ; preds = %.lr.ph, %.preheader
  %.112.lcssa = phi i32 [ 0, %.preheader ], [ %5, %.lr.ph ]
  br label %2, !llvm.loop !5

2:                                                ; preds = %.loopexit, %1
  %.011 = phi i32 [ 0, %1 ], [ %.112.lcssa, %.loopexit ]
  %.0 = phi i32 [ %0, %1 ], [ %.112.lcssa, %.loopexit ]
  switch i32 %.011, label %.preheader [
    i32 4, label %7
    i32 1, label %7
  ]

.preheader:                                       ; preds = %2
  %.not13 = icmp eq i32 %.0, 0
  br i1 %.not13, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.115 = phi i32 [ %6, %.lr.ph ], [ %.0, %.preheader ]
  %.11214 = phi i32 [ %5, %.lr.ph ], [ 0, %.preheader ]
  %3 = srem i32 %.115, 10
  %4 = mul nsw i32 %3, %3
  %5 = add nuw nsw i32 %4, %.11214
  %6 = sdiv i32 %.115, 10
  %.115.off = add i32 %.115, 9
  %.not = icmp ult i32 %.115.off, 19
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !7

7:                                                ; preds = %2, %2
  ret i32 %.011
}

attributes #0 = { nofree norecurse nosync nounwind 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"}
!7 = distinct !{!7, !6}


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