[Bf-committers] 64-bit builds with ray optimization
nathan at letworyinteractive.com
Mon Dec 12 10:42:09 CET 2011
On Windows the ray optimization is on by default:
On Mon, Dec 12, 2011 at 9:45 AM, Sergey Sharybin <sergey.vfx at gmail.com>wrote:
> Tomas, as i understand we're speaking about x86_64 platform, not x86 and
> all x86_64 bit compatible processor are comng with sse2 at least (i'm not
> sure if sse3 is used in out code). It wouldn't be a problem to enable
> rayoptimization and compile with sse/sse2 support (which also improves
> speed of tracking).
> Main issue is about x86 platforms. Yes, we've got code which detects if
> sse2 is supported and it's already used in Cycles and blender internal,
> we're only missing such check for motion tracking which is compiling
> without sse2 support on x86 platforms. The here issue is: Eigen library can
> use sse2/sse3 instructions to improve speed of matrix operations, but Eigen
> is totally header-based library and making runtime detection of sse support
> simply wouldn't work here.
> So i think we should compile 64bit builds of Blender with rayoptimization,
> sse and sse2 optimizations. For 32bit keep global sse optimizations
> disabled and enable only rayoptimization (it seems to be quite safe).
> On Mon, Dec 12, 2011 at 10:59 AM, Thomas Dinges <blender at dingto.org>
> > SSE3 was introduced in 2004 by Intel (Pentium 4) and in 2005 by AMD.
> > Thats 6/7 years now already.
> > If there is any code that can't detect SSE2/3 on runtime, we should just
> > make extra builds. But making only 1 build (even for x86) would be
> > It's okay to support 10 year old cpu's who don't have these extensions,
> > but at the same time we should not disable these optimizations for
> > people using, well "old" hardware too. 6/7 years is old. ;-)
> > Am 12.12.2011 02:10, schrieb Antony Riakiotakis:
> > > Hi everyone, it's release time soon.
> > > There has been some debate on irc on the topic of enabling ray
> > > optimization for release builds.
> > >
> > > Pros are: faster program, cons of course are that we are less
> > > compatible with older machines.
> > >
> > > I see though no reason why 64-bit machines, that support sse2, should
> > > not be built with ray optimization on by default.
> > >
> > > If this is decided upon, there are some -sse3 flags in cycles that
> > > should probably be taken care of.
> > > _______________________________________________
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> > --
> > Thomas Dinges
> > Blender Developer, Artist and Musician
> > www.dingto.org
> > _______________________________________________
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> With best regards, Sergey Sharybin
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