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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-NZ link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>Thanks for that. I should have added I’m using Delphi 7 so a 32-bit compiler. I assume with newer 64-bit compilers an integer is 64 bits by default?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> delphi-bounces@listserver.123.net.nz [mailto:delphi-bounces@listserver.123.net.nz] <b>On Behalf Of </b>Pieter De Wit<br><b>Sent:</b> Sunday, 17 August 2014 11:04 a.m.<br><b>To:</b> delphi@listserver.123.net.nz<br><b>Subject:</b> Re: [DUG] Int64 or floating point faster?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On 16/08/2014 15:30, Ross Levis wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'>Would I be correct that int64 multiplications would be faster than floating point in Delphi? My app needs to do several million.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br><br><br><o:p></o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre>NZ Borland Developers Group - Delphi mailing list<o:p></o:p></pre><pre>Post: <a href="mailto:delphi@listserver.123.net.nz">delphi@listserver.123.net.nz</a><o:p></o:p></pre><pre>Admin: <a href="http://delphi.org.nz/mailman/listinfo/delphi">http://delphi.org.nz/mailman/listinfo/delphi</a><o:p></o:p></pre><pre>Unsubscribe: send an email to <a href="mailto:delphi-request@listserver.123.net.nz">delphi-request@listserver.123.net.nz</a> with Subject: unsubscribe<o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>Hi,<br><br>Back in the good old days, a float was "int32.int32" - I am not sure what they have done with it since 64bit CPU's came about, but the theory should stay the same:<br><br>int64=64bit=1 clock cycle to move.<br>The "mul" command is normally 2 or 3 cycles, so worst case, your int64*int64 will be 6 cycle at worst (2 mov's, 3 for mul and 1 mov for the answer - moving it to your variable)<br><br>By comparison, using float *via the x64* will result in at least 18 cycles - too early on a Sunday to work it out 100% :)<br><br>The tricky part, is the floating point CPU in your machine faster than the x64 - or more optimized for doing this? I don't know but I am willing to bet that it is not - floating point math has always been slower for me.<br><br>HTH,<br><br>Pieter<o:p></o:p></span></p></div></body></html>