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From: Ajit Agarwal <aagarwa1@linux.ibm.com>
To: Peter Bergner <bergner@linux.ibm.com>,
	Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>,
	gcc-patches <gcc-patches@gcc.gnu.org>
Cc: Richard Biener <richard.guenther@gmail.com>,
	Segher Boessenkool <segher@kernel.crashing.org>,
	Jeff Law <jeffreyalaw@gmail.com>
Subject: Re: [PATCH v5] tree-ssa-sink: Improve code sinking pass
Date: Fri, 23 Jun 2023 13:19:28 +0530	[thread overview]
Message-ID: <6af6e371-c659-1818-3f62-30f75ccc61a8@linux.ibm.com> (raw)
In-Reply-To: <54383306-2e13-da8c-b256-739f674e95a8@linux.ibm.com>



On 23/06/23 7:44 am, Peter Bergner wrote:
> On 6/1/23 11:54 PM, Ajit Agarwal via Gcc-patches wrote:
>>
>>
>> On 01/06/23 2:06 pm, Bernhard Reutner-Fischer wrote:
>>> On 1 June 2023 09:20:08 CEST, Ajit Agarwal <aagarwa1@linux.ibm.com> wrote:
>>>> Hello All:
>>>>
>>>> This patch improves code sinking pass to sink statements before call to reduce
>>>> register pressure.
>>>> Review comments are incorporated.
>>>
>>> Hi Ajit!
>>>
>>> I had two comments for v4 that you did not address in v5 or followed up.
>>> thanks,
>>
>> Which comments I didn't address. Please let me know.
> 
> I believe he's referring to these two comments:
> 
>   > +	  && dominated_by_p (CDI_DOMINATORS, new_best_bb, early_bb))
>   > +	{
>   > +	  if (def_use_same_block (use))
>   > +	    return best_bb;
>   > +
>   > +	  return new_best_bb;
>   > +	}
>   > +	return best_bb;
>   > +    }
>   >  
> 
>   Many returns.
>   I'd have said
> 	  && !def_use_same_block (use)
> 	return new_best_bb;
>       else
> 	return best_bb;
> 
>   and rephrase the comment above list of Things to consider accordingly.
> 
> 
> I agree with Bernhard's comment that it could be rewritten to be clearer.
> Although, the "else" isn't really required.  So Bernhard's version would
> look like:
> 
>   if (new_best_bb
>       && use
>       && new_best_bb != best_bb
>       && new_best_bb != early_bb
>       && !is_gimple_call (stmt)
>       && gsi_end_p (gsi_start_phis (new_best_bb))
>       && gimple_bb (use) != early_bb
>       && !is_gimple_call (use)
>       && dominated_by_p (CDI_POST_DOMINATORS, new_best_bb, gimple_bb (use))
>       && dominated_by_p (CDI_DOMINATORS, new_best_bb, early_bb)
>       && !def_use_same_block (use))
>     return new_best_bb;
>   else
>     return best_bb;
> 
> ...or just:
> 
>   if (new_best_bb
>       && use
>       && new_best_bb != best_bb
>       && new_best_bb != early_bb
>       && !is_gimple_call (stmt)
>       && gsi_end_p (gsi_start_phis (new_best_bb))
>       && gimple_bb (use) != early_bb
>       && !is_gimple_call (use)
>       && dominated_by_p (CDI_POST_DOMINATORS, new_best_bb, gimple_bb (use))
>       && dominated_by_p (CDI_DOMINATORS, new_best_bb, early_bb)
>       && !def_use_same_block (use))
>     return new_best_bb;
> 
>   return best_bb;
> 
> 
> Either works.

Thanks Peter. I will incorporate and send the new version of the patch.

> 
> 
> Peter
> 

      reply	other threads:[~2023-06-23  7:49 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-01  7:20 Ajit Agarwal
2023-06-01  8:36 ` Bernhard Reutner-Fischer
2023-06-02  4:54   ` Ajit Agarwal
2023-06-23  2:14     ` Peter Bergner
2023-06-23  7:49       ` Ajit Agarwal [this message]

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