; LLVM IR from xirc/cp-algorithm :: atcoder/abc146/C/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"

@A = external dso_local global i64, align 8
@B = external dso_local global i64, align 8
@X = external dso_local global i64, align 8

; 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
declare dso_local noundef zeroext i1 @_Z7can_buyl(i64 noundef) #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
  %4 = alloca i64, align 8
  %5 = load i64, ptr @X, align 8, !tbaa !5
  %6 = load i64, ptr @A, align 8, !tbaa !5
  %7 = load i64, ptr @B, align 8, !tbaa !5
  %8 = add nsw i64 %6, %7
  %9 = icmp slt i64 %5, %8
  br i1 %9, label %10, label %11

10:                                               ; preds = %0
  store i64 0, ptr %1, align 8
  br label %32

11:                                               ; preds = %0
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #4
  store i64 1000000001, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #4
  store i64 1, ptr %3, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %29, %11
  %13 = load i64, ptr %2, align 8, !tbaa !5
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = sub nsw i64 %13, %14
  %16 = call noundef i64 @_ZSt3absl(i64 noundef %15)
  %17 = icmp sgt i64 %16, 1
  br i1 %17, label %18, label %30

18:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #4
  %19 = load i64, ptr %2, align 8, !tbaa !5
  %20 = load i64, ptr %3, align 8, !tbaa !5
  %21 = add nsw i64 %19, %20
  %22 = ashr i64 %21, 1
  store i64 %22, ptr %4, align 8, !tbaa !5
  %23 = load i64, ptr %4, align 8, !tbaa !5
  %24 = call noundef zeroext i1 @_Z7can_buyl(i64 noundef %23)
  br i1 %24, label %25, label %27

25:                                               ; preds = %18
  %26 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %26, ptr %3, align 8, !tbaa !5
  br label %29

27:                                               ; preds = %18
  %28 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %28, ptr %2, align 8, !tbaa !5
  br label %29

29:                                               ; preds = %27, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #4
  br label %12, !llvm.loop !9

30:                                               ; preds = %12
  %31 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %31, ptr %1, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #4
  br label %32

32:                                               ; preds = %30, %10
  %33 = load i64, ptr %1, align 8
  ret i64 %33
}

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

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 = { 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"

@A = external dso_local local_unnamed_addr global i64, align 8
@B = external dso_local local_unnamed_addr global i64, align 8
@X = external dso_local local_unnamed_addr global i64, align 8

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z7can_buyl(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z5solvev() local_unnamed_addr #0 {
  %1 = load i64, ptr @X, align 8, !tbaa !5
  %2 = load i64, ptr @A, align 8, !tbaa !5
  %3 = load i64, ptr @B, align 8, !tbaa !5
  %4 = add nsw i64 %3, %2
  %5 = icmp slt i64 %1, %4
  br i1 %5, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %0
  %6 = tail call noundef i64 @_ZSt3absl(i64 noundef 1000000000)
  %7 = icmp sgt i64 %6, 1
  br i1 %7, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.0913 = phi i64 [ %..09, %.lr.ph ], [ 1, %.preheader ]
  %.01012 = phi i64 [ %.010., %.lr.ph ], [ 1000000001, %.preheader ]
  %8 = add nsw i64 %.0913, %.01012
  %9 = ashr i64 %8, 1
  %10 = tail call noundef zeroext i1 @_Z7can_buyl(i64 noundef %9)
  %.010. = select i1 %10, i64 %.01012, i64 %9
  %..09 = select i1 %10, i64 %9, i64 %.0913
  %11 = sub nsw i64 %.010., %..09
  %12 = tail call noundef i64 @_ZSt3absl(i64 noundef %11)
  %13 = icmp sgt i64 %12, 1
  br i1 %13, label %.lr.ph, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %0
  %.0 = phi i64 [ 0, %0 ], [ 1, %.preheader ], [ %..09, %.lr.ph ]
  ret i64 %.0
}

; 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,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass