So OK to commit this?

This patch makes sure the profile_count information is initialized for 
the new
bb created in move_sese_region_to_fn.

gcc/ChangeLog:

	* tree-cfg.cc (move_sese_region_to_fn): Initialize profile_count for
	new basic block.

Bootstrapped and regression tested on aarch64-unknown-linux-gnu and 
x86_64-pc-linux-gnu.

On 04/10/2023 12:02, Jan Hubicka wrote:
>> Hi Honza,
>>
>> My current patch set for AArch64 VLA omp codegen started failing on
>> gcc.dg/gomp/pr87898.c after this. I traced it back to
>> 'move_sese_region_to_fn' in tree/cfg.cc not setting count for the bb
>> created.
>>
>> I was able to 'fix' it locally by setting the count of the new bb to the
>> accumulation of e->count () of all the entry_endges (if initialized). I'm
>> however not even close to certain that's the right approach, attached patch
>> for illustration.
>>
>> Kind regards,
>> Andre
>> diff --git a/gcc/tree-cfg.cc b/gcc/tree-cfg.cc
> 
>> index ffab7518b1568b58e610e26feb9e3cab18ddb3c2..32fc47ae683164bf8fac477fbe6e2c998382e754 100644
>> --- a/gcc/tree-cfg.cc
>> +++ b/gcc/tree-cfg.cc
>> @@ -8160,11 +8160,15 @@ move_sese_region_to_fn (struct function *dest_cfun, basic_block entry_bb,
>>     bb = create_empty_bb (entry_pred[0]);
>>     if (current_loops)
>>       add_bb_to_loop (bb, loop);
>> +  profile_count count = profile_count::zero ();
>>     for (i = 0; i < num_entry_edges; i++)
>>       {
>>         e = make_edge (entry_pred[i], bb, entry_flag[i]);
>>         e->probability = entry_prob[i];
>> +      if (e->count ().initialized_p ())
>> +	count += e->count ();
>>       }
>> +  bb->count = count;
> 
> This looks generally right - if you create a BB you need to set its
> count and unless it has self-loop that is the sum of counts of
> incommping edges.
> 
> However the initialized_p check should be unnecessary: if one of entry
> edges to BB is uninitialized, the + operation will make bb count
> uninitialized too, which is OK.
> 
> Honza
>>   
>>     for (i = 0; i < num_exit_edges; i++)
>>       {
>