; LLVM IR from kazunetakahashi/atcoder :: 2019/0707_ABC133/past/C.ll (Z2upx)

; 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"

; 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 nounwind uwtable
define dso_local noundef i64 @_Z2upx(i64 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %24, %1
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = sext i32 %7 to i64
  %9 = icmp sle i64 %8, 2019
  br i1 %9, label %11, label %10

10:                                               ; preds = %6
  store i32 2, ptr %5, align 4
  br label %27

11:                                               ; preds = %6
  %12 = load i64, ptr %3, align 8, !tbaa !5
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = sext i32 %13 to i64
  %15 = add nsw i64 %12, %14
  %16 = srem i64 %15, 2019
  %17 = icmp eq i64 %16, 0
  br i1 %17, label %18, label %23

18:                                               ; preds = %11
  %19 = load i64, ptr %3, align 8, !tbaa !5
  %20 = load i32, ptr %4, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = add nsw i64 %19, %21
  store i64 %22, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %27

23:                                               ; preds = %11
  br label %24

24:                                               ; preds = %23
  %25 = load i32, ptr %4, align 4, !tbaa !9
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %4, align 4, !tbaa !9
  br label %6, !llvm.loop !11

27:                                               ; preds = %18, %10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %28 = load i32, ptr %5, align 4
  switch i32 %28, label %32 [
    i32 2, label %29
    i32 1, label %30
  ]

29:                                               ; preds = %27
  store i64 -1, ptr %2, align 8
  br label %30

30:                                               ; preds = %29, %27
  %31 = load i64, ptr %2, align 8
  ret i64 %31

32:                                               ; preds = %27
  unreachable
}

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

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i64 @_Z2upx(i64 noundef %0) local_unnamed_addr #0 {
  br label %7

2:                                                ; preds = %7
  %indvars.iv.next = or disjoint i64 %indvars.iv, 1
  %3 = add nsw i64 %indvars.iv.next, %0
  %4 = srem i64 %3, 2019
  %5 = icmp eq i64 %4, 0
  br i1 %5, label %11, label %6

6:                                                ; preds = %2
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %exitcond.1 = icmp eq i64 %indvars.iv.next.1, 2020
  br i1 %exitcond.1, label %11, label %7, !llvm.loop !5

7:                                                ; preds = %6, %1
  %indvars.iv = phi i64 [ 0, %1 ], [ %indvars.iv.next.1, %6 ]
  %8 = add nsw i64 %indvars.iv, %0
  %9 = srem i64 %8, 2019
  %10 = icmp eq i64 %9, 0
  br i1 %10, label %11, label %2

11:                                               ; preds = %6, %2, %7
  %spec.select = phi i64 [ %8, %7 ], [ %3, %2 ], [ -1, %6 ]
  ret i64 %spec.select
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass