<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On 10 sep 2012, at 14:41, Thomas Lindgren <<a href="mailto:thomasl_erlang@yahoo.com">thomasl_erlang@yahoo.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><br><blockquote type="cite">I started playing with a simple implementation of MD5 (basically straight from the wiki page) <br>When the implementation produce the correct output, I did some timing for fun and also<br>tried to native compile it. <br>To my astonishment I discovered that the code was slower when native compiled.<br>I am using R15B01 on mac. Can this be true? And in this case why? <br><br>Note that I do not care to optimize the implementation it self! I am more interested why<br>the native compiler produce slower code on this example.<br></blockquote><br><br>On my Mac, the best native result 7% is faster than the best beam result. But the timing varies by 20% from run to run, so I think the proper claim is they are about the same. (I also think Hipe ought to comfortably beat Beam on this sort of code.)<br><br></blockquote>Good to know. On my computer all runs I have tried so far has been slower in native compile.</div><div>I could not believe my eyes.</div><div>So, everything is good then ? ;-)</div><div><br></div><div>/Tony</div><div><br><blockquote type="cite">Unfortunately, 'pp_native' gave broken/confusing output so it's hard to trace what happens. The arithmetic looks like it's being inlined, which ought to provide a boost. There are calls to r/1 and rotate/2 in the inner loop (md5_/6) which possibly should have been inlined.<br><br>Best,<br>Thomas<br></blockquote></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Geneva, Arial, Helvetica, sans-serif; font-size: 12px; ">"Installing applications can lead to corruption over time. </span><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Geneva, Arial, Helvetica, sans-serif; font-size: 12px; ">Applications gradually write over each other's libraries, partial upgrades occur, user and system errors happen, and minute changes may be unnoticeable and difficult to fix"</span></div><div><span class="Apple-style-span" style="color: rgb(51, 51, 51); font-family: Geneva, Arial, Helvetica, sans-serif; font-size: 12px; "><br></span></div></span><br class="Apple-interchange-newline">
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