Sorry... I interpreted Gordon's response as follows: MS does a poor job (insert here with compiling SSE intrinsics), as a result most of his SSE is asm'ed. The asm'ed approach is where you don't trust the compiler to do the right thing with intrinsics, where it has the flexibility of scheduling and assigning registers etc.
I disagree with "MS does a poor job compiling intrinsic code", and that you should not *ever need to resort to __asm anymore. *this is not absolute, there was once a rare case where we found a strange anomaly, but later solved by doing an un-intuitive c code change >Do you find that MS compilers will produce SSE vectorised code _without_ use of intrinsics or raw __asm? Ah this is a tricky question. There is in fact an option in VS 8 and VS 9 project settings to generate SSE or SSE2 code. What this does is that it will evaluate c code and try to use SSE for it. I was surprised to find that this actually lowered the performance of c code, especially c code for matrixf. I'm so glad that the project settings for osg do not turn this on, and I'd recommend not using that, but instead write intrisics ourselves for places that need it. I hope this clears things up. ----- Original Message ----- From: "David Spilling" <[EMAIL PROTECTED]> To: "OpenSceneGraph Users" <osg-users@lists.openscenegraph.org> Sent: Tuesday, July 29, 2008 10:17 AM Subject: Re: [osg-users] Using SSE within OSG > James, > > > > I have to disagree, using VS 7 and up to VS 9. > > > Just to clarify - what are you disagreeing with? Do you find that MS > compilers will produce SSE vectorised code _without_ use of intrinsics or > raw __asm? > > David > ---------------------------------------------------------------------------- ---- > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
