[LNO, mainline] Remember rs6000 builtins decls

[Devang Patel]

On Jun 5, 2004, at 10:37 AM, Andrew Pinski wrote:

>
> On Jun 5, 2004, at 13:03, Devang Patel wrote:
>
>>
>> On Jun 5, 2004, at 8:38 AM, Andrew Pinski wrote:
>>
>>>
>>> On Jun 4, 2004, at 21:47, Devang Patel wrote:
>>>
>>>> This patch updates def_builtin macro to remember vector builtins in
>>>> vector_builtin_fns[]. This allows auto-vectorizer to use these
>>>> builtins directly.
>>>
>>> Why would the auto-vectorizer use the builtins directly?  I and many
>>> others think that the auto-vectorizer should be more target generic
>>> than that.
>>
>> auto-vectorizer is target generic and it asks rs6000 target to 
>> generate
>> particular operations.
>
> But why use the builtins, can you just define some generic trees which 
> does
> the same thing as the target builtins does today and have expand 
> expand them
> to RTL which the back-end understands?  This is how the generic vector 
> stuff
> works and how the auto-vectorizing should work also os it is more 
> generic and
> easier to add/maintain the back-ends.

That's final goal, but at the moment we have two patch from two 
different
person using this approach.

--
Devang