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Re: [Manta] Compiling using SSE on IA64


Chronological Thread 
  • From: Dirk Reiners <dirk@lite3d.com>
  • To: manta@sci.utah.edu
  • Subject: Re: [Manta] Compiling using SSE on IA64
  • Date: Thu, 08 Nov 2007 00:23:08 -0600

        Hi Ingo,

Ingo Wald wrote:
gcc doesn't have an itanium/sse backend, it's a icc-only feature.

You mean backend on the Manta side? That's bad news. :(

That's probably why nobody uses it, and why -- as a consequence -- it's so buggy even under icc.... ;-)

Not sure what you mean here. What's buggy? Icc or the backend? Or both? ;)

> PS: Even with icc -- does SSE@itanium actually give a big speedup in
> the current code ? would things like, e.g., dynbvh traversal even be
> available in non-sse form ?

That's a good question and one that I would certainly like to know before I spend a lot of time trying to make it work.

Without SSE icc is not better than gcc, in fact it's slightly slower, but not enough to matter.

        Dirk



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