On Thu, Jan 31, 2013 at 12:30 PM, Geoffrey Mainland <span dir="ltr">&lt;<a href="mailto:mainland@apeiron.net" target="_blank">mainland@apeiron.net</a>&gt;</span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div id=":5r">2) SSE support is processor and platform dependent. What is the proper<br>
way for the programmer to know what SSE primitives are available? A CPP<br>
define? If so, what should it be called?<br></div></blockquote></div><br>This needs a combination of compile-time and run-time information. The compiler can tell you what instructions it&#39;s willing to use, but you also have to ask the CPU at runtime what it supports, otherwise you&#39;ll end up with crashes when people move code from a machine that has SSE4.2 to a machine that has SSE2.<div>
<br></div><div>Johan added some support for the compile-time bit recently.</div>