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SSE4 instructions
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Robert Hyatt



Joined: 27 Feb 2006
Posts: 15866
Location: Birmingham, AL
PostPost subject: Re: SSE4 instructions    Posted: Wed May 23, 2012 5:47 pm Reply to topic Reply with quote
rvida wrote:
bob wrote:
rbarreira wrote:

Why? I'm pretty sure that doing "hw_popcount (low_32_bits) + hw_popcount (high_32_bits)" is faster than other methods of doing 64-bit popcnt on a 32-bit architecture.


I am not sure why one would do a pair of 32 bit operations on a machine that is obviously 64 bits (those are the only processors with hardware popcnt)...


He meant 64bit SSE4.2 capable processor running a 32bit OS (+32bit engine obviously). In such scenario it makes sense to use hw popcnt even in 32bit mode.


Even worse, as now you lose ALL the advantages the 64 bit cpu brings. Extra 8 registers for starters...

I'm still amazed that anyone considers doing this (32 bit O/S on a very recent 64 bit cpu...)
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Subject Author Date/Time
SSE4 instructions Maurizio Maglio Mon May 21, 2012 8:48 pm
      Re: SSE4 instructions Adam Hair Mon May 21, 2012 10:47 pm
            Re: SSE4 instructions Maurizio Maglio Tue May 22, 2012 7:47 am
      Re: SSE4 instructions Joona Kiiski Tue May 22, 2012 1:55 pm
            Re: SSE4 instructions Engin Üstün Tue May 22, 2012 8:11 pm
                  Re: SSE4 instructions Maurizio Maglio Tue May 22, 2012 8:41 pm
                  Re: SSE4 instructions Robert Hyatt Wed May 23, 2012 3:39 pm
      Re: SSE4 instructions Engin Üstün Tue May 22, 2012 7:31 pm
            Re: SSE4 instructions Engin Üstün Tue May 22, 2012 7:34 pm
                  Re: SSE4 instructions Ricardo Barreira Wed May 23, 2012 7:40 am
                        Re: SSE4 instructions Robert Hyatt Wed May 23, 2012 3:37 pm
                              Re: SSE4 instructions Richard Vida Wed May 23, 2012 5:28 pm
                                    Re: SSE4 instructions Robert Hyatt Wed May 23, 2012 5:47 pm
                                          Re: SSE4 instructions Ricardo Barreira Sat May 26, 2012 3:14 pm
                                    Re: SSE4 instructions Engin Üstün Wed May 23, 2012 10:02 pm
                                          Re: SSE4 instructions Vincent Diepeveen Thu May 24, 2012 12:02 am
                                                Re: SSE4 instructions Engin Üstün Thu May 24, 2012 3:54 pm
                                                      Re: SSE4 instructions Engin Üstün Thu May 24, 2012 4:07 pm
                                          Re: SSE4 instructions Lucas Braesch Thu May 24, 2012 11:03 am
                                          Re: SSE4 instructions Martin Sedlak Thu May 24, 2012 11:47 am
                                                Re: SSE4 instructions Vincent Diepeveen Thu May 24, 2012 12:35 pm
                                                      Re: SSE4 instructions Martin Sedlak Thu May 24, 2012 12:46 pm
                                                      Re: SSE4 instructions Engin Üstün Thu May 24, 2012 4:24 pm
                                    Re: SSE4 instructions Engin Üstün Thu May 24, 2012 4:41 pm
                        Re: SSE4 instructions Engin Üstün Wed May 23, 2012 4:35 pm
                              Re: SSE4 instructions Robert Hyatt Wed May 23, 2012 5:48 pm
                                    Re: SSE4 instructions Engin Üstün Wed May 23, 2012 10:28 pm
                                          Re: SSE4 instructions Robert Hyatt Thu May 24, 2012 3:41 pm
                                                Re: SSE4 instructions Engin Üstün Thu May 24, 2012 4:31 pm
                        Re: SSE4 instructions Engin Üstün Thu May 24, 2012 4:35 pm
      Re: SSE4 instructions Don Dailey Thu May 24, 2012 9:09 pm
            Re: SSE4 instructions Richard Vida Thu May 24, 2012 9:21 pm
                  Re: SSE4 instructions Vincent Diepeveen Fri May 25, 2012 12:19 am
                  Re: SSE4 instructions Engin Üstün Fri May 25, 2012 10:44 pm
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