[FFmpeg-devel] [PATCH] A rather simple H.264 speed optimization

[Måns Rullgård]

Jason Garrett-Glaser wrote:
>> What does gcc do with this on 32-bit platforms.  I've often seen it do
>> some rather horrid things with 64-bit types there.
>
> h264.c already uses 64-bit write combining in many many places; I'm
> just extending it.

That doesn't mean gcc doesn't do stupid things.

> x264 uses it too, and I have never seen GCC pessimize it.  GCC
> pessimizes 64-bit *arithmetic ops*, not copies.

Is this true on non-x86 as well?  That's where gcc usually lets its
stupidity really shine.

-- 
M?ns Rullg?rd
mans at mansr.com