; LLVM IR from tangjz/acm-icpc :: poj/3048.ll (Z7maxfacti)

; 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 @_Z7maxfacti(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = 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 1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 2, ptr %4, align 4, !tbaa !5
  br label %5

5:                                                ; preds = %30, %1
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = mul nsw i32 %6, %7
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = icmp sle i32 %8, %9
  br i1 %10, label %12, label %11

11:                                               ; preds = %5
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %33

12:                                               ; preds = %5
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = srem i32 %13, %14
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %29

17:                                               ; preds = %12
  %18 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %18, ptr %3, align 4, !tbaa !5
  br label %19

19:                                               ; preds = %24, %17
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = srem i32 %20, %21
  %23 = icmp eq i32 %22, 0
  br i1 %23, label %24, label %28

24:                                               ; preds = %19
  %25 = load i32, ptr %4, align 4, !tbaa !5
  %26 = load i32, ptr %2, align 4, !tbaa !5
  %27 = sdiv i32 %26, %25
  store i32 %27, ptr %2, align 4, !tbaa !5
  br label %19, !llvm.loop !9

28:                                               ; preds = %19
  br label %29

29:                                               ; preds = %28, %12
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %4, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %4, align 4, !tbaa !5
  br label %5, !llvm.loop !11

33:                                               ; preds = %11
  %34 = load i32, ptr %2, align 4, !tbaa !5
  %35 = icmp sgt i32 %34, 1
  br i1 %35, label %36, label %38

36:                                               ; preds = %33
  %37 = load i32, ptr %2, align 4, !tbaa !5
  store i32 %37, ptr %3, align 4, !tbaa !5
  br label %38

38:                                               ; preds = %36, %33
  %39 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %39
}

; 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 @_Z7maxfacti(i32 noundef %0) local_unnamed_addr #0 {
  %.not19 = icmp slt i32 %0, 4
  br i1 %.not19, label %._crit_edge, label %.lr.ph23

._crit_edge:                                      ; preds = %.loopexit, %1
  %.015.lcssa = phi i32 [ %0, %1 ], [ %.217, %.loopexit ]
  %.014.lcssa = phi i32 [ 1, %1 ], [ %.1, %.loopexit ]
  %2 = icmp sgt i32 %.015.lcssa, 1
  %spec.select = select i1 %2, i32 %.015.lcssa, i32 %.014.lcssa
  ret i32 %spec.select

.lr.ph23:                                         ; preds = %1, %.loopexit
  %.022 = phi i32 [ %8, %.loopexit ], [ 2, %1 ]
  %.01421 = phi i32 [ %.1, %.loopexit ], [ 1, %1 ]
  %.01520 = phi i32 [ %.217, %.loopexit ], [ %0, %1 ]
  %3 = srem i32 %.01520, %.022
  %4 = icmp eq i32 %3, 0
  br i1 %4, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph23, %.lr.ph
  %.11618 = phi i32 [ %5, %.lr.ph ], [ %.01520, %.lr.ph23 ]
  %5 = sdiv i32 %.11618, %.022
  %6 = srem i32 %5, %.022
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.lr.ph, label %.loopexit, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %.lr.ph23
  %.217 = phi i32 [ %.01520, %.lr.ph23 ], [ %5, %.lr.ph ]
  %.1 = phi i32 [ %.01421, %.lr.ph23 ], [ %.022, %.lr.ph ]
  %8 = add nuw nsw i32 %.022, 1
  %9 = mul nuw nsw i32 %8, %8
  %.not = icmp sgt i32 %9, %.217
  br i1 %.not, label %._crit_edge, label %.lr.ph23, !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,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass