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<div class="gmail_quote">On Sun, May 3, 2009 at 5:12 AM, Greg Lindahl <span dir="ltr"><<a href="mailto:lindahl@pbm.com">lindahl@pbm.com</a>></span> wrote:<br>
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<div class="im">> [Intel and Shanghai]<br>> > Is this deliberate?<br>><br>> In the sense that they have no desire to support<br>> competitors hardware, yes. Not really surprising,<br>> if AMD made compilers I doubt they'd try and do<br>
> Intel specific optimisations either..<br><br></div>Actually, that's what a part of the AMD/Intel anti-trust lawsuit is<br>about. Back in the day of plug-compatible mainframes, IBM would have<br>been in deep anti-trust doodoo for intentionally reducing performance<br>
on competing hardware -- and their mainframe architecture, just like<br>x86, had a wide variety of add-on features which could be tested for<br>individually, just like SSE / SSE2 / SSE3 / etc.<br><br>Instead of making compilers, AMD chose to suport PathScale (now<br>
SiCortex), PGI, and gcc, all of which also have Intel-specific<br>optimizations.<br></blockquote>
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<div>Probably AMD had been thinking hard on this and decided to make compilers at last. <a href="http://developer.amd.com/cpu/open64/pages/default.aspx">http://developer.amd.com/cpu/open64/pages/default.aspx</a></div>
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<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><span id=""></span><br>As for the blog posting, you shouldn't draw general conclusions from a<br>single toy test-case. And I think you'll find all compilers will do a<br>
much better job if they know at compile-time that it's x**(-2)... so<br>if that's your real app, don't code it like that toy.<br><font color="#888888"><br>-- greg<br></font>
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<div></div><br>-- <br>Best Regards,<br>Balamurugan. R<br>
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