<div dir="ltr">It seems that <a href="http://reviews.llvm.org/D15690">http://reviews.llvm.org/D15690</a> only implemented gather/scatter for AVX-512, but not for AVX/AVX2. Is there any plan to enable gather for AVX/2? Thanks.<div><br></div><div>Best,</div><div>Zhi</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 25, 2016 at 8:28 AM, Sanjay Patel <span dir="ltr"><<a href="mailto:spatel@rotateright.com" target="_blank">spatel@rotateright.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I don't think gather has been enabled for AVX2 as of r261875.<br></div>Masked load/store were enabled for AVX with:<br><a href="http://reviews.llvm.org/D16528" target="_blank">http://reviews.llvm.org/D16528</a> / <a href="http://reviews.llvm.org/rL258675" target="_blank">http://reviews.llvm.org/rL258675</a><br></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 24, 2016 at 11:39 PM, Demikhovsky, Elena <span dir="ltr"><<a href="mailto:elena.demikhovsky@intel.com" target="_blank">elena.demikhovsky@intel.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><a name="159071173_-677231612__MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Yes, masked load/store/gather/scatter are completed.<u></u><u></u></span></a></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
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<u></u><span style="font-family:"Calibri",sans-serif;color:#2f5496"><span>-<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span dir="LTR"></span><b><i><span style="color:#2f5496"> Elena<u></u><u></u></span></i></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><a name="159071173_-677231612______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 [mailto:<a href="mailto:zchenhn@gmail.com" target="_blank">zchenhn@gmail.com</a>]
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<b>Sent:</b> Thursday, February 25, 2016 01:20<br>
<b>To:</b> Demikhovsky, Elena <<a href="mailto:elena.demikhovsky@intel.com" target="_blank">elena.demikhovsky@intel.com</a>><br>
<b>Cc:</b> Sanjay Patel <<a href="mailto:spatel@rotateright.com" target="_blank">spatel@rotateright.com</a>>; Nema, Ashutosh <<a href="mailto:Ashutosh.Nema@amd.com" target="_blank">Ashutosh.Nema@amd.com</a>>; llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span></p><div><div><br>
<b>Subject:</b> Re: [llvm-dev] how to force llvm generate gather intrinsic<u></u><u></u></div></div><p></p><div><div>
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<p class="MsoNormal">Hi Elena,<u></u><u></u></p>
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<p class="MsoNormal">Are the masked_load and gather working now? <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Best,<u></u><u></u></p>
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<p class="MsoNormal">Zhi<u></u><u></u></p>
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<p class="MsoNormal">On Sat, Jan 23, 2016 at 12:06 PM, Demikhovsky, Elena <<a href="mailto:elena.demikhovsky@intel.com" target="_blank">elena.demikhovsky@intel.com</a>> wrote:<u></u><u></u></p>
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<p><a name="159071173_-677231612_491726001__MailEndCompose"><span style="font-size:11.0pt;font-family:Wingdings;color:#1f497d">Ø</span></a><span style="font-size:7.0pt;color:#1f497d">
</span>Can we legalize the same set of masked load/store operations for AVX1 as AVX2?<u></u><u></u></p>
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Yes, of course.<u></u><u></u></p>
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<span style="font-family:"Calibri",sans-serif;color:#2f5496">-</span><span style="font-size:7.0pt;color:#2f5496">
</span><b><i><span style="color:#2f5496"> Elena</span></i></b><u></u><u></u></p>
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<p class="MsoNormal"><a name="159071173_-677231612_491726001______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">
Sanjay Patel [mailto:<a href="mailto:spatel@rotateright.com" target="_blank">spatel@rotateright.com</a>]
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<b>Sent:</b> Saturday, January 23, 2016 18:42<br>
<b>To:</b> Nema, Ashutosh <<a href="mailto:Ashutosh.Nema@amd.com" target="_blank">Ashutosh.Nema@amd.com</a>><br>
<b>Cc:</b> Demikhovsky, Elena <<a href="mailto:elena.demikhovsky@intel.com" target="_blank">elena.demikhovsky@intel.com</a>>; zhi chen <<a href="mailto:zchenhn@gmail.com" target="_blank">zchenhn@gmail.com</a>>; llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [llvm-dev] how to force llvm generate gather intrinsic</span><u></u><u></u></p>
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<p class="MsoNormal">On Sat, Jan 23, 2016 at 6:45 AM, Nema, Ashutosh <<a href="mailto:Ashutosh.Nema@amd.com" target="_blank">Ashutosh.Nema@amd.com</a>> wrote:<u></u><u></u></p>
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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
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<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
</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">avx2 else we scalarize it.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">> 1) I did not switch-on masked_load/store to AVX1, I can do this.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> </span><u></u><u></u></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).</span><u></u><u></u></p>
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Thanks everyone for the answers. My immediate motivation is to improve the masked load/store ops for an AVX target. If we can fix scatter/gather similarly, that would be great.<br>
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Can we legalize the same set of masked load/store operations for AVX1 as AVX2? If I'm understanding them correctly, the AVX1 FP instructions (vmaskmovps/pd) can be used in place of the AVX2 int instructions (vpmaskmovd/q), just with domain crossing penalties
thrown in. I think we do this for other missing integer ops for an AVX1 target either in x86 lowering or in the tablegen patterns.<u></u><u></u></p>
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<p class="MsoNormal"> Elena - I'm not too familiar with the vectorizers or scatter/gather, but I'll certainly take a look at D15690. Thanks for pointing out the patch!<u></u><u></u></p>
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