[x265] How can I enable the AVX2 version of DCT and IDCT?

[Ximing Cheng]

Thanks!

On 9/16/15, Dnyaneshwar Gorade <dnyaneshwar at multicorewareinc.com> wrote:
> Hi Ximing,
>
> If your machine (and OS also) supports AVX2 instruction set then you are
> already compiling and using AVX2 version of DCT functions.
> x265 automatically detects & sets all assembly primitives to highest/latest
> available instruction sets.
>
> When you run encoder, you can check command prompt output if cpu
> capabilities info shows AVX2 instruction set or not.
> You can get the source code of DCT AVX2 functions in dct8.asm file.
>
>
> Regards,
> Dnyaneshwar
>
> On Wed, Sep 16, 2015 at 6:25 PM, Ximing Cheng <chengximing1989 at gmail.com>
> wrote:
>
>> I read the source code of the /source/common/vec/dct-sse3.cpp and I found
>> the comments said "Note: We have AVX2 assembly for these functions, but
>> since AVX2 is still somewhat rare on end-user PCs we still compile and
>> link
>> these SSE3 intrinsic SIMD functions".
>>
>> But now both my PC and server support Intel AVX2 instruction set. If I
>> want to compile these functions with AVX2 assembly, where to find the
>> AVX2
>> version of source code of these functions?
>>
>> Thanks!
>>
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>>
>>
>