; LLVM IR from hanzohasashi33/Competetive_programming :: UVa/ad-hoc/100-The_3n+1_problem.ll (Z11getMaxCyclexx)

; 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: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z8getCyclex(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 noundef i64 @_Z11getMaxCyclexx(i64 noundef %0, i64 noundef %1) #0 {
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  store i64 %0, ptr %3, align 8, !tbaa !5
  store i64 %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store i64 0, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %7 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %7, ptr %6, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %22, %2
  %9 = load i64, ptr %6, align 8, !tbaa !5
  %10 = load i64, ptr %4, align 8, !tbaa !5
  %11 = icmp sle i64 %9, %10
  br i1 %11, label %13, label %12

12:                                               ; preds = %8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %25

13:                                               ; preds = %8
  %14 = load i64, ptr %6, align 8, !tbaa !5
  %15 = call noundef i64 @_Z8getCyclex(i64 noundef %14)
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = icmp sgt i64 %15, %16
  br i1 %17, label %18, label %21

18:                                               ; preds = %13
  %19 = load i64, ptr %6, align 8, !tbaa !5
  %20 = call noundef i64 @_Z8getCyclex(i64 noundef %19)
  store i64 %20, ptr %5, align 8, !tbaa !5
  br label %21

21:                                               ; preds = %18, %13
  br label %22

22:                                               ; preds = %21
  %23 = load i64, ptr %6, align 8, !tbaa !5
  %24 = add nsw i64 %23, 1
  store i64 %24, ptr %6, align 8, !tbaa !5
  br label %8, !llvm.loop !9

25:                                               ; preds = %12
  %26 = load i64, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %26
}

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 = 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"

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_Z8getCyclex(i64 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef i64 @_Z11getMaxCyclexx(i64 noundef %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not9 = icmp sgt i64 %0, %1
  br i1 %.not9, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %7, %2
  %.08.lcssa = phi i64 [ 0, %2 ], [ %.1, %7 ]
  ret i64 %.08.lcssa

.lr.ph:                                           ; preds = %2, %7
  %.011 = phi i64 [ %8, %7 ], [ %0, %2 ]
  %.0810 = phi i64 [ %.1, %7 ], [ 0, %2 ]
  %3 = tail call noundef i64 @_Z8getCyclex(i64 noundef %.011)
  %4 = icmp sgt i64 %3, %.0810
  br i1 %4, label %5, label %7

5:                                                ; preds = %.lr.ph
  %6 = tail call noundef i64 @_Z8getCyclex(i64 noundef %.011)
  br label %7

7:                                                ; preds = %.lr.ph, %5
  %.1 = phi i64 [ %6, %5 ], [ %.0810, %.lr.ph ]
  %8 = add i64 %.011, 1
  %exitcond.not = icmp eq i64 %.011, %1
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !5
}

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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


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