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using Popcount and Prefetch with SSE4 hardware support
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Robert Hyatt



Joined: 27 Feb 2006
Posts: 15817
Location: Birmingham, AL
PostPost subject: Re: using Popcount and Prefetch with SSE4 hardware support    Posted: Wed May 23, 2012 3:41 pm Reply to topic Reply with quote
Engin wrote:
lol, "Removing the prefetch actually IMPROVES PERFORMANCE"

thats what i experemented too Smile

NTA means no cache using, so you can complete disable that too.


The issue is that one has to be very careful when choosing to pre-fetch something you might not need, and replacing something that you might need. Done wisely, it should never hurt. Done carelessly, it can hurt as Linus pointed out...

Compilers are notoriously poor at dealing with this, because they don't understand the code...
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Subject Author Date/Time
using Popcount and Prefetch with SSE4 hardware support Engin Üstün Sat May 19, 2012 2:36 pm
      Re: using Popcount and Prefetch with SSE4 hardware support Daniel Shawul Sat May 19, 2012 2:53 pm
            Re: using Popcount and Prefetch with SSE4 hardware support Engin Üstün Sat May 19, 2012 3:05 pm
                  Re: using Popcount and Prefetch with SSE4 hardware support Gerd Isenberg Sat May 19, 2012 4:05 pm
                        Re: using Popcount and Prefetch with SSE4 hardware support Edmund Moshammer Sat May 19, 2012 5:10 pm
                              Re: using Popcount and Prefetch with SSE4 hardware support Gerd Isenberg Sat May 19, 2012 5:31 pm
                                    Re: using Popcount and Prefetch with SSE4 hardware support Engin Üstün Tue May 22, 2012 8:04 pm
                                          Re: using Popcount and Prefetch with SSE4 hardware support Robert Hyatt Wed May 23, 2012 3:41 pm
            Re: using Popcount and Prefetch with SSE4 hardware support Daniel Shawul Tue Jul 10, 2012 12:09 pm
      Re: using Popcount and Prefetch with SSE4 hardware support Ronald de Man Sat May 19, 2012 3:57 pm
            Re: using Popcount and Prefetch with SSE4 hardware support Engin Üstün Sat May 19, 2012 5:54 pm
                  Re: using Popcount and Prefetch with SSE4 hardware support Ronald de Man Sat May 19, 2012 6:17 pm
      Re: using Popcount and Prefetch with SSE4 hardware support Robert Hyatt Sun May 20, 2012 2:51 pm
            Re: using Popcount and Prefetch with SSE4 hardware support Engin Üstün Tue May 22, 2012 7:54 pm
                  Re: using Popcount and Prefetch with SSE4 hardware support Engin Üstün Tue May 22, 2012 7:56 pm
                        Re: using Popcount and Prefetch with SSE4 hardware support Ronald de Man Tue May 22, 2012 8:15 pm
                              Re: using Popcount and Prefetch with SSE4 hardware support Engin Üstün Wed May 23, 2012 10:19 pm
Post new topic    TalkChess.com Forum Index -> Computer Chess Club: Programming and Technical Discussions

 
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