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<div class="moz-cite-prefix">.. forcing the vector size to 4 does
not prevent using AVX. I just hit the following:<br>
<br>
LV: We can vectorize this loop!<br>
LV: Found trip count: 4<br>
LV: The Widest type: 64 bits.<br>
LV: The Widest register is: 256 bits.<br>
LV: Using user VF 4.<br>
<br>
Looks like I have to disable AVX somehow. (Which is sad on its
own.)<br>
<br>
Frank<br>
<br>
<br>
<br>
On 12/11/13 10:34, Renato Golin wrote:<br>
</div>
<blockquote
cite="mid:CAMSE1kd=4+mNAZAh2sNV29FtfdpodqOAvRE7F0u1Rpi_FcDtqw@mail.gmail.com"
type="cite">
<div dir="ltr">On 12 November 2013 15:14, Frank Winter <<a
moz-do-not-send="true" href="mailto:fwinter@jlab.org">fwinter@jlab.org</a>>
wrote:<br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote">
I am asking because the option 'force-vector-width' is too
restrictive.<br>
I would like to leave open the possibility to use vector
width 2.</blockquote>
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<div class="gmail_extra">I was about to say that, and you saved
us both one cycle. ;)</div>
<div class="gmail_extra">
<br>
</div>
<div class="gmail_extra">What you could do is to force an
architecture that doesn't have AVX, only SSE. I'm not sure how
to do that on the JIT, I suppose setting the Target attributes
would be enough. Nor I know what CPU string limits support to
SSE, but that should do it.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">cheers,</div>
<div class="gmail_extra">--renato</div>
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