; LLVM IR from tangjz/acm-icpc :: lydsy/2705.ll (Z3phix)

; 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"

@sum = external dso_local global i32, align 4
@f = external dso_local global [40 x i64], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z3phix(i64 noundef %0) #0 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  store i64 %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  %5 = load i64, ptr %2, align 8, !tbaa !5
  store i64 %5, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %33, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = load i32, ptr @sum, align 4, !tbaa !9
  %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 %36

11:                                               ; preds = %6
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds [40 x i64], ptr @f, i64 0, i64 %14
  %16 = load i64, ptr %15, align 8, !tbaa !5
  %17 = srem i64 %12, %16
  %18 = icmp eq i64 %17, 0
  br i1 %18, label %19, label %32

19:                                               ; preds = %11
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = load i32, ptr %4, align 4, !tbaa !9
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [40 x i64], ptr @f, i64 0, i64 %22
  %24 = load i64, ptr %23, align 8, !tbaa !5
  %25 = sdiv i64 %20, %24
  %26 = load i32, ptr %4, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [40 x i64], ptr @f, i64 0, i64 %27
  %29 = load i64, ptr %28, align 8, !tbaa !5
  %30 = sub nsw i64 %29, 1
  %31 = mul nsw i64 %25, %30
  store i64 %31, ptr %3, align 8, !tbaa !5
  br label %32

32:                                               ; preds = %19, %11
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %4, align 4, !tbaa !9
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !11

36:                                               ; preds = %10
  %37 = load i64, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i64 %37
}

; 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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@sum = external dso_local local_unnamed_addr global i32, align 4
@f = external dso_local local_unnamed_addr global [40 x i64], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local noundef i64 @_Z3phix(i64 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @sum, align 4, !tbaa !5
  %.not10 = icmp slt i32 %2, 1
  br i1 %.not10, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %1
  %3 = add nuw i32 %2, 1
  %wide.trip.count = zext i32 %3 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %12, %1
  %.09.lcssa = phi i64 [ %0, %1 ], [ %.1, %12 ]
  ret i64 %.09.lcssa

.lr.ph:                                           ; preds = %.lr.ph.preheader, %12
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next, %12 ]
  %.0911 = phi i64 [ %0, %.lr.ph.preheader ], [ %.1, %12 ]
  %4 = getelementptr inbounds [40 x i64], ptr @f, i64 0, i64 %indvars.iv
  %5 = load i64, ptr %4, align 8, !tbaa !9
  %6 = srem i64 %0, %5
  %7 = icmp eq i64 %6, 0
  br i1 %7, label %8, label %12

8:                                                ; preds = %.lr.ph
  %9 = sdiv i64 %.0911, %5
  %10 = add nsw i64 %5, -1
  %11 = mul nsw i64 %9, %10
  br label %12

12:                                               ; preds = %.lr.ph, %8
  %.1 = phi i64 [ %11, %8 ], [ %.0911, %.lr.ph ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long long", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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