; LLVM IR from tangjz/acm-icpc :: projecteuler/530.ll (Z1fx)

; 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"

@_ZZ1fxE5his_n = external hidden global i64, align 8
@_ZZ1fxE3ret = external hidden global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z1fx(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  %7 = load i64, ptr @_ZZ1fxE5his_n, align 8, !tbaa !5
  %8 = load i64, ptr %3, align 8, !tbaa !5
  %9 = icmp eq i64 %7, %8
  br i1 %9, label %10, label %12

10:                                               ; preds = %1
  %11 = load i64, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  store i64 %11, ptr %2, align 8
  br label %38

12:                                               ; preds = %1
  %13 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %13, ptr @_ZZ1fxE5his_n, align 8, !tbaa !5
  store i64 0, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  store i64 1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  br label %14

14:                                               ; preds = %34, %12
  %15 = load i64, ptr %4, align 8, !tbaa !5
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %17 = icmp sle i64 %15, %16
  br i1 %17, label %19, label %18

18:                                               ; preds = %14
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  br label %36

19:                                               ; preds = %14
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = load i64, ptr %4, align 8, !tbaa !5
  %22 = sdiv i64 %20, %21
  store i64 %22, ptr %6, align 8, !tbaa !5
  %23 = load i64, ptr %3, align 8, !tbaa !5
  %24 = load i64, ptr %6, align 8, !tbaa !5
  %25 = sdiv i64 %23, %24
  %26 = add nsw i64 %25, 1
  store i64 %26, ptr %5, align 8, !tbaa !5
  %27 = load i64, ptr %6, align 8, !tbaa !5
  %28 = load i64, ptr %5, align 8, !tbaa !5
  %29 = load i64, ptr %4, align 8, !tbaa !5
  %30 = sub nsw i64 %28, %29
  %31 = mul nsw i64 %27, %30
  %32 = load i64, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  %33 = add nsw i64 %32, %31
  store i64 %33, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  br label %34

34:                                               ; preds = %19
  %35 = load i64, ptr %5, align 8, !tbaa !5
  store i64 %35, ptr %4, align 8, !tbaa !5
  br label %14, !llvm.loop !9

36:                                               ; preds = %18
  %37 = load i64, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  store i64 %37, ptr %2, align 8
  br label %38

38:                                               ; preds = %36, %10
  %39 = load i64, ptr %2, align 8
  ret i64 %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 = !{!"long long", !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"

@_ZZ1fxE5his_n = external hidden local_unnamed_addr global i64, align 8
@_ZZ1fxE3ret = external hidden local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i64 @_Z1fx(i64 noundef %0) local_unnamed_addr #0 {
  %2 = load i64, ptr @_ZZ1fxE5his_n, align 8, !tbaa !5
  %3 = icmp eq i64 %2, %0
  br i1 %3, label %._crit_edge, label %4

._crit_edge:                                      ; preds = %1
  %.0.pre = load i64, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  br label %11

4:                                                ; preds = %1
  store i64 %0, ptr @_ZZ1fxE5his_n, align 8, !tbaa !5
  %.not15 = icmp slt i64 %0, 1
  br i1 %.not15, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %4, %.lr.ph
  %.01317 = phi i64 [ %7, %.lr.ph ], [ 1, %4 ]
  %storemerge16 = phi i64 [ %10, %.lr.ph ], [ 0, %4 ]
  %5 = udiv i64 %0, %.01317
  %6 = udiv i64 %0, %5
  %7 = add nuw nsw i64 %6, 1
  %8 = sub nsw i64 %7, %.01317
  %9 = mul nsw i64 %8, %5
  %10 = add nsw i64 %9, %storemerge16
  %.not.not = icmp slt i64 %6, %0
  br i1 %.not.not, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %4
  %storemerge.lcssa = phi i64 [ 0, %4 ], [ %10, %.lr.ph ]
  store i64 %storemerge.lcssa, ptr @_ZZ1fxE3ret, align 8, !tbaa !5
  br label %11

11:                                               ; preds = %._crit_edge, %.loopexit
  %.0 = phi i64 [ %.0.pre, %._crit_edge ], [ %storemerge.lcssa, %.loopexit ]
  ret i64 %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: 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 = !{!6, !6, i64 0}
!6 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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