[FFmpeg-devel] [PATCH 2/2] configure: Enable GCC vectorization on ≥4.9

[James Almer]

On 7/9/2016 3:28 PM, Ronald S. Bultje wrote:
> Hi,
> 
> On Sat, Jul 9, 2016 at 1:38 PM, James Almer <jamrial at gmail.com> wrote:
>> [14:31:33] <jamrial>
>> https://github.com/mpc-hc/mpc-hc/commit/fe1b4ebd1ab69109c898fd4aa250013e18d2d116
>> looks like some projects using ffmpeg are disabling tree vectorization to
>> fix crashes
>> [14:33:03] <jamrial> guess we should disable it for good. it's brought
>> more problems than potential performance improvements
>> [14:35:19] <@nevcairiel> with gcc 6.1 it also doesnt build on windows
>> [14:35:27] <@nevcairiel> because inline asm and registers
>> [14:35:54] <@nevcairiel> (doesnt build on x86 if you use -msse or higher)
>> [14:36:05] <jamrial> yeah, happened to me
>> [14:36:22] <jamrial> -march=haswell on mingw x86_32 = cabac fails to
>> compile
>> [14:37:38] <jamrial> also with 5.x
>>
>> Not a lot of arguments remain to keep this in place, so i'll revert this
>> change soon if nobody objects.
> 
> 
> OK.
> 
> Ronald

Pushed. Should i backport this to the 3.1 and 3.0 branches?