Re: [PATCH GCC][07/13]Preserve data references for whole distribution life time

[Richard Biener <richard.guenther@gmail.com>]

On Mon, Jun 19, 2017 at 3:34 PM, Bin.Cheng <amker.cheng@gmail.com> wrote:
> On Tue, Jun 13, 2017 at 12:14 PM, Richard Biener
> <richard.guenther@gmail.com> wrote:
>> On Mon, Jun 12, 2017 at 7:02 PM, Bin Cheng <Bin.Cheng@arm.com> wrote:
>>> Hi,
>>> This patch collects and preserves all data references in loop for whole
>>> distribution life time.  It will be used afterwards.
>>>
>>> Bootstrap and test on x86_64 and AArch64.  Is it OK?
>>
>> +/* Vector of data references in the loop to be distributed.  */
>> +static vec<data_reference_p> *datarefs_vec;
>> +
>> +/* Map of data reference in the loop to a unique id.  */
>> +static hash_map<data_reference_p, int> *datarefs_map;
>> +
>>
>> no need to make those pointers.  It's not a unique id but
>> the index into the datarefs_vec vector, right?
>>
>> loop distribution doesn't yet use dr->aux so it would be nice
>> to avoid the hash_map in favor of using that field.
>>
>> #define DR_INDEX (dr) ((uintptr_t)(dr)->aux)
>>
>> +  if (datarefs_vec->length () > 64)
>>
>> There is PARAM_VALUE (PARAM_LOOP_MAX_DATAREFS_FOR_DATADEPS)
>> with a default value of 1000.  Please use that instead of magic numbers.
>>
>> +    {
>> +      if (dump_file && (dump_flags & TDF_DETAILS))
>> +       fprintf (dump_file,
>> +                "Loop %d not distributed: more than 64 memory references.\n",
>> +                loop->num);
>> +
>> +      free_rdg (rdg);
>> +      loop_nest->release ();
>> +      delete loop_nest;
>> +      free_data_refs (*datarefs_vec);
>> +      delete datarefs_vec;
>> +      return 0;
>> +    }
>>
>> auto_* were so nice ...
> Hi Richard,
> This is the updated patch.  It removes datarefs_map as well as checks
> number of data references against the parameter.  Is it OK?

ENOPATCH

> Thanks,
> bin
> 2017-06-07  Bin Cheng  <bin.cheng@arm.com>
>
>     * tree-loop-distribution.c (params.h): Include header file.
>     (MAX_DATAREFS_NUM, DR_INDEX): New macro.
>     (datarefs_vec): New global var.
>     (create_rdg_vertices): Use datarefs_vec directly.
>     (free_rdg): Don't free data references.
>     (build_rdg): Update use.  Don't free data references.
>     (distribute_loop): Compute global variable for data references.
>     Bail out if there are too many data references.