; LLVM IR from VastoLorde95/Competitive-Programming :: Codeforces/258 Division 2/Problem E/E.ll (Z3prev)

; 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"

@fact = external dso_local global [21 x i64], align 16
@inv_fact = external dso_local global [21 x i64], align 16
@MOD = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3invx(i64 noundef) #0

; 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

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3prev() #0 {
  %1 = alloca i32, align 4
  store i64 1, ptr @fact, align 16, !tbaa !5
  store i64 1, ptr @inv_fact, align 16, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 1, ptr %1, align 4, !tbaa !9
  br label %2

2:                                                ; preds = %28, %0
  %3 = load i32, ptr %1, align 4, !tbaa !9
  %4 = icmp sle i32 %3, 20
  br i1 %4, label %6, label %5

5:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %31

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !9
  %8 = sub nsw i32 %7, 1
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [21 x i64], ptr @fact, i64 0, i64 %9
  %11 = load i64, ptr %10, align 8, !tbaa !5
  %12 = load i32, ptr %1, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = mul nsw i64 %11, %13
  %15 = load i64, ptr @MOD, align 8, !tbaa !5
  %16 = srem i64 %14, %15
  %17 = load i32, ptr %1, align 4, !tbaa !9
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds [21 x i64], ptr @fact, i64 0, i64 %18
  store i64 %16, ptr %19, align 8, !tbaa !5
  %20 = load i32, ptr %1, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds [21 x i64], ptr @fact, i64 0, i64 %21
  %23 = load i64, ptr %22, align 8, !tbaa !5
  %24 = call noundef i64 @_Z3invx(i64 noundef %23)
  %25 = load i32, ptr %1, align 4, !tbaa !9
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [21 x i64], ptr @inv_fact, i64 0, i64 %26
  store i64 %24, ptr %27, align 8, !tbaa !5
  br label %28

28:                                               ; preds = %6
  %29 = load i32, ptr %1, align 4, !tbaa !9
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %1, align 4, !tbaa !9
  br label %2, !llvm.loop !11

31:                                               ; preds = %5
  ret void
}

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"

@fact = external dso_local local_unnamed_addr global [21 x i64], align 16
@inv_fact = external dso_local local_unnamed_addr global [21 x i64], align 16
@MOD = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z3invx(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z3prev() local_unnamed_addr #0 {
  store i64 1, ptr @fact, align 16, !tbaa !5
  store i64 1, ptr @inv_fact, align 16, !tbaa !5
  br label %2

1:                                                ; preds = %2
  ret void

2:                                                ; preds = %0, %2
  %indvars.iv = phi i64 [ 1, %0 ], [ %indvars.iv.next, %2 ]
  %3 = add nsw i64 %indvars.iv, -1
  %4 = getelementptr inbounds [21 x i64], ptr @fact, i64 0, i64 %3
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %6 = mul nsw i64 %5, %indvars.iv
  %7 = load i64, ptr @MOD, align 8, !tbaa !5
  %8 = srem i64 %6, %7
  %9 = getelementptr inbounds [21 x i64], ptr @fact, i64 0, i64 %indvars.iv
  store i64 %8, ptr %9, align 8, !tbaa !5
  %10 = tail call noundef i64 @_Z3invx(i64 noundef %8)
  %11 = getelementptr inbounds [21 x i64], ptr @inv_fact, i64 0, i64 %indvars.iv
  store i64 %10, ptr %11, align 8, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 21
  br i1 %exitcond.not, label %1, label %2, !llvm.loop !9
}

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" }

!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,LoopRotatePass,SROAPass,SimplifyCFGPass,TailCallElimPass