; LLVM IR from xirc/cp-algorithm :: atcoder/abc174/E/main.ll (Z5solvev)

; 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"

@K = external dso_local global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z9count_alll(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 uwtable
define dso_local noundef i64 @_Z5solvev() #2 {
  %1 = alloca i64, align 8
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #4
  store i64 0, ptr %1, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #4
  store i64 1000000000, ptr %2, align 8, !tbaa !5
  br label %4

4:                                                ; preds = %23, %0
  %5 = load i64, ptr %2, align 8, !tbaa !5
  %6 = load i64, ptr %1, align 8, !tbaa !5
  %7 = sub nsw i64 %5, %6
  %8 = call noundef i64 @_ZSt3absl(i64 noundef %7)
  %9 = icmp sgt i64 %8, 1
  br i1 %9, label %10, label %24

10:                                               ; preds = %4
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  %11 = load i64, ptr %1, align 8, !tbaa !5
  %12 = load i64, ptr %2, align 8, !tbaa !5
  %13 = add nsw i64 %11, %12
  %14 = sdiv i64 %13, 2
  store i64 %14, ptr %3, align 8, !tbaa !5
  %15 = load i64, ptr %3, align 8, !tbaa !5
  %16 = call noundef i64 @_Z9count_alll(i64 noundef %15)
  %17 = load i64, ptr @K, align 8, !tbaa !5
  %18 = icmp sle i64 %16, %17
  br i1 %18, label %19, label %21

19:                                               ; preds = %10
  %20 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %20, ptr %2, align 8, !tbaa !5
  br label %23

21:                                               ; preds = %10
  %22 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %22, ptr %1, align 8, !tbaa !5
  br label %23

23:                                               ; preds = %21, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  br label %4, !llvm.loop !9

24:                                               ; preds = %4
  %25 = load i64, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #4
  ret i64 %25
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZSt3absl(i64 noundef) #3

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 = { 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 #3 = { inlinehint 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 #4 = { 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", !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"

@K = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z9count_alll(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z5solvev() local_unnamed_addr #0 {
  %1 = tail call noundef i64 @_ZSt3absl(i64 noundef 1000000000)
  %2 = icmp sgt i64 %1, 1
  br i1 %2, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %0, %.lr.ph
  %.011 = phi i64 [ %..0, %.lr.ph ], [ 0, %0 ]
  %.0810 = phi i64 [ %.08., %.lr.ph ], [ 1000000000, %0 ]
  %3 = add nsw i64 %.011, %.0810
  %4 = sdiv i64 %3, 2
  %5 = tail call noundef i64 @_Z9count_alll(i64 noundef %4)
  %6 = load i64, ptr @K, align 8, !tbaa !5
  %.not = icmp sgt i64 %5, %6
  %.08. = select i1 %.not, i64 %.0810, i64 %4
  %..0 = select i1 %.not, i64 %4, i64 %.011
  %7 = sub nsw i64 %.08., %..0
  %8 = tail call noundef i64 @_ZSt3absl(i64 noundef %7)
  %9 = icmp sgt i64 %8, 1
  br i1 %9, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.08.lcssa = phi i64 [ 1000000000, %0 ], [ %.08., %.lr.ph ]
  ret i64 %.08.lcssa
}

; Function Attrs: inlinehint mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZSt3absl(i64 noundef) local_unnamed_addr #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 = { inlinehint 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", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass