[Openmcl-devel] Floating point performance

Ron Garret ron at flownet.com
Sat Jan 30 19:27:12 UTC 2010


On Jan 30, 2010, at 11:18 AM, Paul Onions wrote:

> On 30 Jan 2010, at 16:28, Paul Onions wrote:
> 
>> BTW I'm running 1.5-dev-r13391M-trunk (DarwinPPC32)
>> 
> 
> Seems that it must be related either to PPC-ness or 32bit-ness,  
> because running the test functions on a 1.5-dev-r13281M-trunk  
> (LinuxX8664) system gave good results (almost identical timing for the  
> two functions).

This is probably related to the fact that some PPCs don't have hardware SQRT.  My guess would be that your PPC actually does have hardware SQRT, and CMU is using it but CCL isn't.

rg




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