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<div class="moz-cite-prefix">On 2/16/2018 1:11 AM, ORiordan, Martin
via cfe-dev wrote:<br>
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<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif">Hi CFE-Devs,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif">I received a bug report for a breaking
change between CLang v4.0 and v5.0 regarding sub-vectors
that has been caused by:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:12.0pt;font-family:"Courier New""><a class="moz-txt-link-freetext" href="http://llvm.org/viewvc/llvm-project?view=revision&revision=298369">http://llvm.org/viewvc/llvm-project?view=revision&revision=298369</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif">The example is as follows:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Courier New"">
char16 v0, v1;<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Courier New"">
...<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Courier New"">
v1.s0123456 = v0.s0123456; // Replace the 1<sup>st</sup>
7-elements of ‘v1’ with the 1<sup>st</sup> 7-elements of
‘v0’<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif">which used to generate valid code, but
which is now diagnosed with the following error:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Courier New"">
error: vector component access has invalid length 7.
Supported: 1,2,3,4,8,16.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Book
Antiqua",serif">However, I don’t see why it should not
be possible to replace any range of elements of a vector
with a corresponding set of elements.</span></p>
</div>
</blockquote>
<br>
Vector swizzles are defined in the OpenCL standard, and
<a class="moz-txt-link-freetext" href="https://www.khronos.org/registry/OpenCL/specs/opencl-2.2-cplusplus.html#builtin-vector-data-types">https://www.khronos.org/registry/OpenCL/specs/opencl-2.2-cplusplus.html#builtin-vector-data-types</a>
says "vector-swizzle-selector shall have swizzle size of 1, 2, 3, 4,
8 or 16."<br>
<br>
-Eli<br>
<br>
<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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