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Re: [PATCH] Optimize v*gather* with masks with all high bits set

On 11/04/2011 08:53 AM, Jakub Jelinek wrote:
> On Fri, Nov 04, 2011 at 08:48:30AM -0700, Richard Henderson wrote:
>> On 11/04/2011 03:57 AM, Jakub Jelinek wrote:
>>> +      /* Optimize.  If mask is known to have all high bits set,
>>> +	 replace op0 with pc_rtx to signal that the instruction
>>> +	 overwrites the whole destination and doesn't use its
>>> +	 previous contents.  */
>>
>> Why pass in PC, rather than nothing?
> 
> I wanted to avoid adding an extra set of expanders, if there is something,
> I can use the same expander and just different insns.  There are currently
> 16 expanders, we'd need another 16 for that.

*shrug* Ok then.


r~
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