; LLVM IR from lzyrapx/Competitive-Programming :: ACdream/1075（广义斐波那契数列求循环节）.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"

@fac = external dso_local global [2 x [505 x i64]], align 16
@n = external dso_local global i64, align 8
@cnt = external dso_local global i64, align 8
@pri = external dso_local global [6 x i64], align 16
@num = external dso_local global [6 x i64], align 16

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfsix(i32 noundef %0, i64 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !9
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = sext i32 %6 to i64
  %8 = load i64, ptr @cnt, align 8, !tbaa !9
  %9 = icmp eq i64 %7, %8
  br i1 %9, label %10, label %15

10:                                               ; preds = %2
  %11 = load i64, ptr %4, align 8, !tbaa !9
  %12 = load i64, ptr @n, align 8, !tbaa !9
  %13 = add nsw i64 %12, 1
  store i64 %13, ptr @n, align 8, !tbaa !9
  %14 = getelementptr inbounds [505 x i64], ptr getelementptr inbounds ([2 x [505 x i64]], ptr @fac, i64 0, i64 1), i64 0, i64 %12
  store i64 %11, ptr %14, align 8, !tbaa !9
  br label %38

15:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %35, %15
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = load i32, ptr %3, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [6 x i64], ptr @num, i64 0, i64 %20
  %22 = load i64, ptr %21, align 8, !tbaa !9
  %23 = icmp sle i64 %18, %22
  br i1 %23, label %25, label %24

24:                                               ; preds = %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %38

25:                                               ; preds = %16
  %26 = load i32, ptr %3, align 4, !tbaa !5
  %27 = add nsw i32 %26, 1
  %28 = load i64, ptr %4, align 8, !tbaa !9
  call void @_Z3dfsix(i32 noundef %27, i64 noundef %28)
  %29 = load i32, ptr %3, align 4, !tbaa !5
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [6 x i64], ptr @pri, i64 0, i64 %30
  %32 = load i64, ptr %31, align 8, !tbaa !9
  %33 = load i64, ptr %4, align 8, !tbaa !9
  %34 = mul nsw i64 %33, %32
  store i64 %34, ptr %4, align 8, !tbaa !9
  br label %35

35:                                               ; preds = %25
  %36 = load i32, ptr %5, align 4, !tbaa !5
  %37 = add nsw i32 %36, 1
  store i32 %37, ptr %5, align 4, !tbaa !5
  br label %16, !llvm.loop !11

38:                                               ; preds = %24, %10
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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" }
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 = !{!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"

@fac = external dso_local local_unnamed_addr global [2 x [505 x i64]], align 16
@n = external dso_local local_unnamed_addr global i64, align 8
@cnt = external dso_local local_unnamed_addr global i64, align 8
@pri = external dso_local local_unnamed_addr global [6 x i64], align 16
@num = external dso_local local_unnamed_addr global [6 x i64], align 16

; 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 = sext i32 %0 to i64
  %4 = load i64, ptr @cnt, align 8, !tbaa !5
  %5 = icmp eq i64 %4, %3
  br i1 %5, label %10, label %.preheader

.preheader:                                       ; preds = %2
  %6 = getelementptr inbounds [6 x i64], ptr @num, i64 0, i64 %3
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %.not11 = icmp slt i64 %7, 0
  br i1 %.not11, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader
  %8 = add nsw i32 %0, 1
  %9 = getelementptr inbounds [6 x i64], ptr @pri, i64 0, i64 %3
  br label %14

10:                                               ; preds = %2
  %11 = load i64, ptr @n, align 8, !tbaa !5
  %12 = add nsw i64 %11, 1
  store i64 %12, ptr @n, align 8, !tbaa !5
  %13 = getelementptr inbounds [505 x i64], ptr getelementptr inbounds (i8, ptr @fac, i64 4040), i64 0, i64 %11
  store i64 %1, ptr %13, align 8, !tbaa !5
  br label %.loopexit

14:                                               ; preds = %.lr.ph, %14
  %indvars.iv = phi i64 [ 0, %.lr.ph ], [ %indvars.iv.next, %14 ]
  %.0912 = phi i64 [ %1, %.lr.ph ], [ %16, %14 ]
  tail call void @_Z3dfsix(i32 noundef %8, i64 noundef %.0912)
  %15 = load i64, ptr %9, align 8, !tbaa !5
  %16 = mul nsw i64 %15, %.0912
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %17 = load i64, ptr %6, align 8, !tbaa !5
  %.not.not = icmp sgt i64 %17, %indvars.iv
  br i1 %.not.not, label %14, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %14, %.preheader, %10
  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 = !{!"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,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass