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<div class="moz-cite-prefix">See
<a class="moz-txt-link-freetext" href="http://lists.llvm.org/pipermail/llvm-dev/2018-July/124792.html">http://lists.llvm.org/pipermail/llvm-dev/2018-July/124792.html</a> ?<br>
<br>
-Eli<br>
<br>
On 9/20/2018 3:40 PM, hameeza ahmed wrote:<br>
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cite="mid:CAFMPKeZX=pw2+KaRLoYCcLuHcAQyWrJ6sdJb3P0ZZ0DT+Ey0Kg@mail.gmail.com">
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Thank you.
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<div>I am working on a machine with greater vector widths. How to
enable the emission of greater and different vector widths in
loop codes through pragma ? and automatically.<br>
<br>
On Friday, September 21, 2018, Friedman, Eli <<a
href="mailto:efriedma@codeaurora.org" moz-do-not-send="true">efriedma@codeaurora.org</a>>
wrote:<br>
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<div>On 9/20/2018 2:15 PM, hameeza ahmed wrote:<br>
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<div>Hello,</div>
<div>I m trying to set vector width using #pragma
clang loop vectorize_width(32) but i m getting
width 8 for the following kernel;</div>
<br>
<div><b>i m getting following output when i
compiled;</b></div>
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</b></div>
<div><b>clang -O3 correlation.c
-Rpass=loop-vectorize -emit-llvm
-march=knl -S -o 1.ll<br>
correlation.c:38:9: remark: vectorized loop
(vectorization width: 8, interleaved count: 4)
[-Rpass=loop-vectorize]<br>
for (j = 0; j < M; j++)<br>
^<br>
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<br>
With AVX-512, an instruction can operate on at most 8
double-precision lanes. The vectorizer recognizes that, and
interleaves the loop so you get 8*4==32 scalar iterations
per iteration of the vectorized loop.<br>
<br>
-Eli<br>
<pre cols="72">--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>
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<pre class="moz-signature" cols="72">--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project</pre>
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