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

[Michael Niedermayer]

On Sat, Jul 09, 2016 at 04:07:14PM -0300, James Almer wrote:
> 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?

if they are affected, yes
when in doubt yes

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Observe your enemies, for they first find out your faults. -- Antisthenes
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