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<div style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">I thought i sent this earlier but it seems not... Its mainly because IR doesn't allow metadata on function decls/definitions!<br>
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Sent from my Windows Phone</div>
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<span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">From:
</span><span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif"><a href="mailto:renato.golin@linaro.org">Renato Golin</a></span><br>
<span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">Sent:
</span><span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">ý17/ý12/ý2013 22:06</span><br>
<span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">To:
</span><span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif"><a href="mailto:listmail@philipreames.com">Philip Reames</a></span><br>
<span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">Cc:
</span><span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif"><a href="mailto:James.Molloy@arm.com">James Molloy</a>;
<a href="mailto:llvm-commits@cs.uiuc.edu">LLVM Commits</a></span><br>
<span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">Subject:
</span><span style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">Re: RFC: Enable vectorization of call instructions in the loop vectorizer</span><br>
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<div class="gmail_quote">On 17 December 2013 19:10, Philip Reames <span dir="ltr">
<<a href="mailto:listmail@philipreames.com" target="_blank">listmail@philipreames.com</a>></span> wrote:<br>
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<div><span style="color:rgb(34,34,34)">Specifically with regards to metadata, why is the metadata on the call site not the function declaration? I would expect that a call to "cos" would always vectorize to the same "cos4". Is supporting different vectorizations
at different points of the program a key goal?</span></div>
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<div>Yes. Sometimes...</div>
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<div>See the test in the patch for an idea of two different functions, maybe both available, maybe not.</div>
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<div>Also, some variants could be more efficient in some cases, while some in others. This may sound vague, but OpenCL has such a large number of functions that I'd be surprised if there were only simple cases... James can give more concrete examples on where
this is important.<br>
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<div>In a strictly libc case, you may create several variants of memcpy based on the arguments (restrict or volatile, address space boundaries, etc), and apply the fastest you can on each case.</div>
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<div>cheers,</div>
<div>--renato</div>
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