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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks Sanjay for highlighting this, few days back I also faced similar problem
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">while generating masked store in avx1 mode, found its only supported under
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">avx2 else we scalarize it.<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">> 1)
</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I did not switch-on masked_load/store to AVX1, I can do this.<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">Yes Elena, This should be supported for FP type in avx1 mode (for INT type, I doubt X86 has masked_load/store instruction in avx1 mode).<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">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Ashutosh<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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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> llvm-dev [mailto:llvm-dev-bounces@lists.llvm.org]
<b>On Behalf Of </b>Demikhovsky, Elena via llvm-dev<br>
<b>Sent:</b> Saturday, January 23, 2016 1:32 PM<br>
<b>To:</b> zhi chen; Sanjay Patel<br>
<b>Cc:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> Re: [llvm-dev] how to force llvm generate gather intrinsic<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo5"><a name="_MailEndCompose"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I did not switch-on masked_load/store to AVX1, I can do this.</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo5"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I did not switch-on masked gather on AVX2 because the instruction is slow. There is no scatter on AVX2.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l2 level1 lfo5"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Currently, gather/scatter does not work on SKX because the patch is still under review
</span><a href="http://reviews.llvm.org/D15690"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">http://reviews.llvm.org/D15690</span></a><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">. I’d be happy if you agree
to review it.<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" style="margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="font-family:"Calibri",sans-serif;color:#2F5496"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><i><span style="color:#2F5496"> Elena<o:p></o:p></span></i></b></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"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> zhi chen [<a href="mailto:zchenhn@gmail.com">mailto:zchenhn@gmail.com</a>]
<br>
<b>Sent:</b> Saturday, January 23, 2016 02:58<br>
<b>To:</b> Sanjay Patel <<a href="mailto:spatel@rotateright.com">spatel@rotateright.com</a>><br>
<b>Cc:</b> Demikhovsky, Elena <<a href="mailto:elena.demikhovsky@intel.com">elena.demikhovsky@intel.com</a>>; LLVM Developers Mailing List <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [llvm-dev] how to force llvm generate gather intrinsic<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks for your response, Sanjay. I know there are intrinsics available in C/C++. But the problem is that I want to instrument my code at the IR level and generate those instructions. I don't want to touch the source code. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">Zhi<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Jan 22, 2016 at 4:54 PM, Sanjay Patel <<a href="mailto:spatel@rotateright.com" target="_blank">spatel@rotateright.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I was just looking at the related masked load/store operations, and I think there are at least 2 bugs:<br>
<br>
1. X86TTIImpl::isLegalMaskedLoad/Store() should be legal for FP types with AVX1 (not just AVX2).<br>
2. X86TTIImpl::isLegalMaskedGather/Scatter() should be legal for 128/256 bit vectors with AVX2 (not just AVX512).<o:p></o:p></p>
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<p class="MsoNormal">I looked at this for the first time today, so I may be missing something...<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">So for the moment, the answer to your question is 'no'; there's no generic way to produce these instructions. You should be able to use the _mm_* intrinsics in C though.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Jan 22, 2016 at 5:00 PM, zhi chen via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I used clang -O3 -c -emit-llvm on the follow code to generate a bitcode, say a.bc. I read the .ll file and didn't see any gather intrinsic. Also, I used opt -O3 -mcpu=core-avx2/-mcpu=skx, but there is still no gather intrinsic generated.<o:p></o:p></p>
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<p class="MsoNormal">int foo(int A[800], int B[800], int C[800]) {<o:p></o:p></p>
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<p class="MsoNormal"> for (int i = 0; i < 800; i++) {<o:p></o:p></p>
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<p class="MsoNormal"> A[B[i]] = i + 5;<o:p></o:p></p>
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<p class="MsoNormal"> }<o:p></o:p></p>
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<p class="MsoNormal"> for (int i = 0; i < 800; i++) {<o:p></o:p></p>
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<p class="MsoNormal"> A[B[i]]++;<o:p></o:p></p>
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<p class="MsoNormal"> }<o:p></o:p></p>
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<p class="MsoNormal"> for (int i = 0; i < 800; i++) {<o:p></o:p></p>
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<p class="MsoNormal"> A[i] = B[C[i]];<o:p></o:p></p>
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<p class="MsoNormal"> }<o:p></o:p></p>
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<p class="MsoNormal"> return 0;<o:p></o:p></p>
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<p class="MsoNormal">Could some give me an example that will generate gather intrinsic for AVX2? I tried to used the masked_gather intrinsic provided in the language ref. But it seemed that it only generates gather intrinsic for AVX-512 but for AVX-2. I found
that there are 16 gather intrinsic versions depending on the data types provided for AVX-2. Do I have to check the data type before calling them specifically? or is there a generic way to use AVX-2 gather intrinsic? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">Zhi <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>
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<a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" target="_blank">http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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