; LLVM IR from tangjz/acm-icpc :: 51nod/1010.ll (Z3dfsix)

; 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"

@tot = external dso_local global i32, align 4
@seq = external dso_local global [10917 x i64], align 16
@_ZL3lim = external hidden constant [3 x i64], align 16
@_ZL5prime = external hidden constant [3 x i32], align 4

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsix(i32 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i64, align 8
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = icmp eq i32 %5, 3
  br i1 %6, label %7, label %13

7:                                                ; preds = %2
  %8 = load i64, ptr %4, align 8, !tbaa !9
  %9 = load i32, ptr @tot, align 4, !tbaa !5
  %10 = add nsw i32 %9, 1
  store i32 %10, ptr @tot, align 4, !tbaa !5
  %11 = sext i32 %9 to i64
  %12 = getelementptr inbounds [10917 x i64], ptr @seq, i64 0, i64 %11
  store i64 %8, ptr %12, align 8, !tbaa !9
  br label %36

13:                                               ; preds = %2
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = add nsw i32 %14, 1
  %16 = load i64, ptr %4, align 8, !tbaa !9
  call void @_Z3dfsix(i32 noundef %15, i64 noundef %16)
  br label %17

17:                                               ; preds = %25, %13
  %18 = load i64, ptr %4, align 8, !tbaa !9
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [3 x i64], ptr @_ZL3lim, i64 0, i64 %20
  %22 = load i64, ptr %21, align 8, !tbaa !9
  %23 = icmp sle i64 %18, %22
  br i1 %23, label %24, label %35

24:                                               ; preds = %17
  br label %25

25:                                               ; preds = %24
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [3 x i32], ptr @_ZL5prime, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = sext i32 %31 to i64
  %33 = load i64, ptr %4, align 8, !tbaa !9
  %34 = mul nsw i64 %33, %32
  store i64 %34, ptr %4, align 8, !tbaa !9
  call void @_Z3dfsix(i32 noundef %27, i64 noundef %34)
  br label %17, !llvm.loop !11

35:                                               ; preds = %17
  br label %36

36:                                               ; preds = %35, %7
  ret void
}

attributes #0 = { mustprogress 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"}


; 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"

@tot = external dso_local local_unnamed_addr global i32, align 4
@seq = external dso_local local_unnamed_addr global [10917 x i64], align 16
@_ZL3lim = external hidden local_unnamed_addr constant [3 x i64], align 16
@_ZL5prime = external hidden local_unnamed_addr constant [3 x i32], align 4

; Function Attrs: mustprogress nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z3dfsix(i32 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %0, 3
  br i1 %3, label %4, label %9

4:                                                ; preds = %2
  %5 = load i32, ptr @tot, align 4, !tbaa !5
  %6 = add nsw i32 %5, 1
  store i32 %6, ptr @tot, align 4, !tbaa !5
  %7 = sext i32 %5 to i64
  %8 = getelementptr inbounds [10917 x i64], ptr @seq, i64 0, i64 %7
  store i64 %1, ptr %8, align 8, !tbaa !9
  br label %.loopexit

9:                                                ; preds = %2
  %10 = add nsw i32 %0, 1
  tail call void @_Z3dfsix(i32 noundef %10, i64 noundef %1)
  %11 = sext i32 %0 to i64
  %12 = getelementptr inbounds [3 x i64], ptr @_ZL3lim, i64 0, i64 %11
  %13 = load i64, ptr %12, align 8, !tbaa !9
  %.not10 = icmp slt i64 %13, %1
  br i1 %.not10, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %9
  %14 = getelementptr inbounds [3 x i32], ptr @_ZL5prime, i64 0, i64 %11
  %15 = load i32, ptr %14, align 4, !tbaa !5
  %16 = sext i32 %15 to i64
  br label %17

17:                                               ; preds = %.lr.ph, %17
  %.011 = phi i64 [ %1, %.lr.ph ], [ %18, %17 ]
  %18 = mul nsw i64 %.011, %16
  tail call void @_Z3dfsix(i32 noundef %10, i64 noundef %18)
  %.not = icmp sgt i64 %18, %13
  br i1 %.not, label %.loopexit, label %17, !llvm.loop !11

.loopexit:                                        ; preds = %17, %9, %4
  ret void
}

attributes #0 = { mustprogress nofree 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 = !{!"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,GlobalOptPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass