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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Adam,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You are right, thank you for fixing this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You can commit this change.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<![if !supportLists]><span style="font-family:"Calibri","sans-serif";color:#31849B"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span dir="LTR"></span><b><i><span style="color:#31849B"> Elena<o:p></o:p></span></i></b></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Adam Nemet [mailto:anemet@apple.com]
<br>
<b>Sent:</b> Wednesday, September 10, 2014 11:06<br>
<b>To:</b> Demikhovsky, Elena<br>
<b>Cc:</b> llvm-commits<br>
<b>Subject:</b> Re: [PATCH][AVX512] Fix miscompile for unpack<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Ping^2?<br>
<br>
On Sep 2, 2014, at 10:55 AM, Adam Nemet <<a href="mailto:anemet@apple.com">anemet@apple.com</a>> wrote:<br>
<br>
> Ping?<br>
> <br>
> On Aug 13, 2014, at 11:48 PM, Adam Nemet <<a href="mailto:anemet@apple.com">anemet@apple.com</a>> wrote:<br>
> <br>
>> Hi Elena,<br>
>> <br>
>> r189189 implemented AVX512 unpack by essentially performing a 256-bit unpack<br>
>> between the low and the high 256 bits of src1 into the low part of the<br>
>> destination and another unpack of the low and high 256 bits of src2 into the<br>
>> high part of the destination.<br>
>> <br>
>> I don't think that's how unpack works. AVX512 unpack simply has more 128-bit<br>
>> lanes but other than it works the same way as AVX. So in each 128-bit lane, we're<br>
>> always interleaving certain parts of both operands rather different parts of<br>
>> one of the operands.<br>
>> <br>
>> E.g. for this:<br>
>> __v16sf a = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };<br>
>> __v16sf b = { 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 };<br>
>> __v16sf c = __builtin_shufflevector(a, b, 0, 8, 1, 9, 4, 12, 5, 13, 16,<br>
>> 24, 17, 25, 20, 28, 21, 29);<br>
>> <br>
>> we generated punpcklps (notice how the elements of a and b are not interleaved<br>
>> in the shuffle). In turn, c was set to this:<br>
>> <br>
>> 0 16 1 17 4 20 5 21 8 24 9 25 12 28 13 29<br>
>> <br>
>> Obviously this should have just returned the mask vector of the shuffle<br>
>> vector.<br>
>> <br>
>> I mostly reverted this change and made sure the original AVX code worked<br>
>> for 512-bit vectors as well.<br>
>> <br>
>> Also updated the tests because they matched the logic from the code.<br>
>> <br>
>> Please let me know if this looks good.<br>
>> <br>
>> Thanks,<br>
>> Adam<br>
>> <o:p></o:p></span></p>
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<o:p></o:p></span></p>
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