[PATCH][ARM] NEON DImode neg

[Richard Earnshaw]

On 14/04/12 14:11, Andrew Stubbs wrote:
> And now with the patch. :(
> 
> On 14/04/12 13:48, Andrew Stubbs wrote:
>> On 12/04/12 16:48, Richard Earnshaw wrote:
>>> If negation in Neon needs a scratch register, it seems to me to be
>>> somewhat odd that we're disparaging the ARM version.
>>>
>>> Also, wouldn't it be sensible to support a variant that was
>>> early-clobber on operand 0, but loaded immediate zero into that value
>>> first:
>>>
>>> vmov Dd, #0
>>> vsub Dd, Dd, Dm
>>>
>>> That way you'll never need more than two registers, whereas today you
>>> want three.
>>
>> This patch implements the changes you suggested.
>>
>> I've done a full bootstrap and test and found no regressions.
>>
>> OK?
>>
>> Andrew
>>
>> P.S. This patch can't actually be committed until my "NEON DImode
>> immediate constants" patch is approved and committed. (Without that the
>> load #0 needs a constant pool, and loading constants this late has a bug
>> at -O0.)
>>
>> neon-neg64.patch
>>
>>
>> 2012-04-12  Andrew Stubbs  <ams@codesourcery.com>
>>
>> 	gcc/
>> 	* config/arm/arm.md (negdi2): Use gen_negdi2_neon.
>> 	* config/arm/neon.md (negdi2_neon): New insn.
>> 	Also add splitters for core and NEON registers.
>>

OK

R.