; LLVM IR from tangjz/acm-icpc :: codeforces/gym/104068F.ll (Z7preparev)

; 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"

@f = external dso_local global [1000001 x i32], align 16

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z7preparev() #0 {
  %1 = alloca i32, align 4
  store i32 1, ptr getelementptr inbounds ([1000001 x i32], ptr @f, i64 0, i64 1), align 4, !tbaa !5
  store i32 1, ptr @f, align 16, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #2
  store i32 2, ptr %1, align 4, !tbaa !5
  br label %2

2:                                                ; preds = %24, %0
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = icmp slt i32 %3, 1000001
  br i1 %4, label %6, label %5

5:                                                ; preds = %2
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #2
  br label %27

6:                                                ; preds = %2
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = sub nsw i32 %7, 1
  %9 = sext i32 %8 to i64
  %10 = getelementptr inbounds [1000001 x i32], ptr @f, i64 0, i64 %9
  %11 = load i32, ptr %10, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = load i32, ptr %1, align 4, !tbaa !5
  %15 = add nsw i32 %13, %14
  %16 = sext i32 %15 to i64
  %17 = sub nsw i64 %16, 1
  %18 = mul nsw i64 %12, %17
  %19 = srem i64 %18, 998244353
  %20 = trunc i64 %19 to i32
  %21 = load i32, ptr %1, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [1000001 x i32], ptr @f, i64 0, i64 %22
  store i32 %20, ptr %23, align 4, !tbaa !5
  br label %24

24:                                               ; preds = %6
  %25 = load i32, ptr %1, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %1, align 4, !tbaa !5
  br label %2, !llvm.loop !9

27:                                               ; preds = %5
  ret void
}

; 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 = !{!"int", !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"

@f = external dso_local local_unnamed_addr global [1000001 x i32], align 16

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(write, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z7preparev() local_unnamed_addr #0 {
  store i32 1, ptr getelementptr inbounds (i8, ptr @f, i64 4), align 4, !tbaa !5
  store i32 1, ptr @f, align 16, !tbaa !5
  br label %2

1:                                                ; preds = %2
  ret void

2:                                                ; preds = %10, %0
  %3 = phi i64 [ 1, %0 ], [ %14, %10 ]
  %indvars.iv = phi i64 [ 2, %0 ], [ %indvars.iv.next.1, %10 ]
  %4 = shl nuw nsw i64 %indvars.iv, 1
  %5 = add nsw i64 %4, -1
  %6 = mul nsw i64 %5, %3
  %7 = srem i64 %6, 998244353
  %8 = trunc nsw i64 %7 to i32
  %9 = getelementptr inbounds [1000001 x i32], ptr @f, i64 0, i64 %indvars.iv
  store i32 %8, ptr %9, align 8, !tbaa !5
  %exitcond.not = icmp eq i64 %indvars.iv, 1000000
  br i1 %exitcond.not, label %1, label %10, !llvm.loop !9

10:                                               ; preds = %2
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %11 = shl nuw nsw i64 %indvars.iv.next, 1
  %12 = add nsw i64 %11, -1
  %13 = mul nsw i64 %12, %7
  %14 = srem i64 %13, 998244353
  %15 = trunc nsw i64 %14 to i32
  %16 = getelementptr inbounds [1000001 x i32], ptr @f, i64 0, i64 %indvars.iv.next
  store i32 %15, ptr %16, align 4, !tbaa !5
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  br label %2
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind memory(write, 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: BDCEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass