altivec vs. sse2 benchmarks

[jhu]

i can't find any direct performance benchmarks comparing the two. anyone want to help me write one?

 

[gwag]

Running DNETC with an altivec core offers a 400% speed increase, running it with an SSE2 core offers a 25% increase.

 

[Avalon]

What's Altivec?

 

[Illissius]

running it with an SSE2 core offers a 25% increase

Is that 25% from SSE+SSE2 vs neither, or vs SSE sans SSE2?

What's Altivec?

AltiVec is some sort of vector processing unit the G5s have. Don't know much more about it than that, though.

 

[jhu]

i was thinking of common calculations that scientists would encounter, but i don't really know any. also, i don't have a ppc computer.

 

[zephyrprime]

It's kinda tough to do direct comparisons of the 2 because you always have to wonder how well coded for SSE or altivec the program is. I've had some experience programming SSE and the problem is, c/c++ compilers can't handle sse as well as it can plain floating point or integer code. Because of this, you have to resort to using compiler "intrinsics" but doing that sucks compared to writing regular math forumulas.

 

[jhu]

how about pure assembly routines?