; LLVM IR from chirag-singhal/Coding-Interview-101 :: Miscellaneous/InterviewBit/Maths/TraillingZeroesFactorial.ll (Z14trailingZeroesi)

; 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 i32 @_Z14trailingZeroesi(i32 noundef %0) #0 {
  %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
  store i32 0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 5, ptr %4, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %28, %1
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = icmp sle i32 %7, %8
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %31

11:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %12 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %12, ptr %5, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %22, %11
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = icmp ne i32 %14, 0
  br i1 %15, label %16, label %20

16:                                               ; preds = %13
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = srem i32 %17, 5
  %19 = icmp eq i32 %18, 0
  br label %20

20:                                               ; preds = %16, %13
  %21 = phi i1 [ false, %13 ], [ %19, %16 ]
  br i1 %21, label %22, label %27

22:                                               ; preds = %20
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr %5, align 4, !tbaa !5
  %26 = sdiv i32 %25, 5
  store i32 %26, ptr %5, align 4, !tbaa !5
  br label %13, !llvm.loop !9

27:                                               ; preds = %20
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %28

28:                                               ; preds = %27
  %29 = load i32, ptr %4, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %4, align 4, !tbaa !5
  br label %6, !llvm.loop !11

31:                                               ; preds = %10
  %32 = load i32, ptr %3, align 4, !tbaa !5
  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.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"}
!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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z14trailingZeroesi(i32 noundef %0) local_unnamed_addr #0 {
  %.not15 = icmp slt i32 %0, 5
  br i1 %.not15, label %._crit_edge, label %.preheader

.preheader:                                       ; preds = %1, %.critedge
  %.0917 = phi i32 [ %9, %.critedge ], [ 5, %1 ]
  %.01016 = phi i32 [ %.1.lcssa, %.critedge ], [ 0, %1 ]
  %2 = urem i32 %.0917, 5
  %3 = icmp eq i32 %2, 0
  br i1 %3, label %.lr.ph, label %.critedge

._crit_edge:                                      ; preds = %.critedge, %1
  %.010.lcssa = phi i32 [ 0, %1 ], [ %.1.lcssa, %.critedge ]
  ret i32 %.010.lcssa

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.014 = phi i32 [ %5, %.lr.ph ], [ %.0917, %.preheader ]
  %.113 = phi i32 [ %4, %.lr.ph ], [ %.01016, %.preheader ]
  %4 = add nsw i32 %.113, 1
  %5 = sdiv i32 %.014, 5
  %6 = add nsw i32 %.014, -5
  %.not11 = icmp ult i32 %6, -9
  %7 = srem i32 %5, 5
  %8 = icmp eq i32 %7, 0
  %or.cond = and i1 %.not11, %8
  br i1 %or.cond, label %.lr.ph, label %.critedge, !llvm.loop !5

.critedge:                                        ; preds = %.lr.ph, %.preheader
  %.1.lcssa = phi i32 [ %.01016, %.preheader ], [ %4, %.lr.ph ]
  %9 = add nuw i32 %.0917, 1
  %exitcond.not = icmp eq i32 %.0917, %0
  br i1 %exitcond.not, label %._crit_edge, label %.preheader, !llvm.loop !7
}

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"}
!7 = distinct !{!7, !6}


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