[x264-devel] [PATCH 1/1] arm: optimize neon luma intra deblock

[Martin Storsjö]

On Wed, 2 Sep 2015, Janne Grunau wrote:

> On 2015-09-02 11:48:25 +0300, Martin Storsjö wrote:
>> On Wed, 2 Sep 2015, Janne Grunau wrote:
>>
>>> Hi Martin,
>>>
>>> I forgot to rescheduling the beginning of the macro in the last iteration.
>>> The floating point compare is a neat trick to test a 64-bit register
>>> against 0 and control the program flow based on it. I tend to forget that
>>> this is possible.
>>>
>>> We might have to add vmrs handling to gaspp. Older assembers might
>>> understand fmstat instead.
>>
>> Hmm, maybe. armasm handles it fine, but old apple binutils doesn't.
>> When testing there, I get the following:
>>
>> {standard input}:955:ARM register expected -- `vmrs APSR_nzcv,FPSCR'
>>
>> When trying with fmstat, I get this instead:
>>
>> {standard input}:955:garbage following instruction -- `fmstat APSR_nzcv,FPSCR'
>
> it's plain 'fmstat' or 'fmrx r15, FPSCR', sorry for not being more
> precise.

Indeed, the old binutils handle both of these just fine.

// Martin