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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We are interested in these intrinsics anyway:<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"><4 x double> @llvm.masked.indexed.load.v4f64 (double* <ptr>, <4 x i32> <index>, i32 <alignment>, <4 x i1>%mask, <4 x double>%paththru)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Presence of index means that the sequential load is not a solution.<o:p></o:p></p>
<p class="MsoNormal">If you are not going to implement this interface now, I’ll do this later.<o:p></o:p></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>
<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"><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""> Renato Golin [mailto:renato.golin@linaro.org]
<br>
<b>Sent:</b> Thursday, April 23, 2015 10:29<br>
<b>To:</b> reviews+D9194+public+a2f9c543cd08afc3@reviews.llvm.org<br>
<b>Cc:</b> Ahmed Bougacha; Hao.Liu@arm.com; llvm-commits@cs.uiuc.edu; qcolombet@apple.com; Demikhovsky, Elena<br>
<b>Subject:</b> Re: [PATCH] Add new indexed load/store intrinsics.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p><br>
On 23 Apr 2015 3:38 am, "Hao Liu" <<a href="mailto:Hao.Liu@arm.com">Hao.Liu@arm.com</a>> wrote:<br>
><br>
> Hi Renato and Ahmed,<br>
><br>
> I agree with your comments.<br>
><br>
> But I want to change the plan. Because I think maybe there is no need to use intrinsics.<br>
> For the interleaved load about <4 x double><br>
><br>
> <4 x double> @llvm.indexed.load.v4f64 (double* <ptr>, <4 x i32> <index>, i32 <alignment>)<br>
><br>
> I think we can use two common IRs:<br>
><br>
> <value> = load <4 x double>, <4 x double>* <ptr><br>
> shufflevector <4 x double> <value>, <4 x double> undef, <4 x i32> <0, 2, 1, 3><br>
><br>
> Even though it is more complex for a backend to match two IRs, it is achievable. I think the disadvantage of intrinsics is not easy to be optimized.<br>
><br>
> I want to implement the loop vectorization on interleaved memory access with vectorload/vectorstore+shufflevector.<br>
><br>
> What do you think?<o:p></o:p></p>
<p>I agree. If it's possible to represent it in plain IR, I see no reason to not do it.
<o:p></o:p></p>
<p>I'll be particularly interested in how other passes scramble the accesses, making the pattern irrecoverable. But I guess will find that out as you progress with the examples and tests.
<o:p></o:p></p>
<p>Cheers, <br>
Renato <o:p></o:p></p>
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