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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">FloatVT may be illegal if you generate it from v64i8. But in my opinion, you can leave it as is.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In this cases “float casting” is not required.<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">So, this patch looks good.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you.<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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</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, August 20, 2014 23:32<br>
<b>To:</b> Demikhovsky, Elena<br>
<b>Cc:</b> Khasanov, Robert; llvm-commits<br>
<b>Subject:</b> Re: [PATCH][AVX512] Add class to group common template arguments related to vector type<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">Hi Elena, <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 Aug 18, 2014, at 9:31 AM, Demikhovsky, Elena <<a href="mailto:elena.demikhovsky@intel.com">elena.demikhovsky@intel.com</a>> wrote:<o:p></o:p></p>
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<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt">Hi Adam,<br>
<br>
Some things that I see:<br>
<br>
1) I suggest to rename EltNum to NumOfElts<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">I went with NumElts. That seems to be used more commonly in headers likes MachineValueTypes.h.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt">2)<br>
+ // Corresponding write-mask register class.<br>
+ RegisterClass KRC = !cast<RegisterClass>("VK" # EltNum # "WM");<br>
+<br>
+ // The GPR register class that can hold the write mask.<br>
+ RegisterClass MRC = !cast<RegisterClass>("GR" # EltNum);<br>
<br>
VK2 is possible, GR2 is not.<span class="xapple-converted-space"> </span><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">Good catch, thanks. I modified this to give GR8 for NumElts <= 8.<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt">2) I don't think that default rc is good. Let everybody specify register class explicitly.<br>
+class X86VectorVTInfo<int EltNum, ValueType EltVT, RegisterClass rc = VR512,<br>
+ string suffix = ""> {<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">Done.<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt">3) Let's assume that I'm building<br>
def v16f32_info : X86VectorVTInfo<16, f32, VR512, "ps"><br>
how FloatVT will look like?<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">It would be v16f32, i.e. the original type.<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt">Do we need IntVT for completeness?<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">Do you think we’ll need it? I was going to wait until there is a need for it.<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt">4) I suggest to add broadcast string {1toX} to the info.<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">Done.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Please review the new version.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Adam<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.5pt"><br>
<br>
<br>
- Elena<br>
<br>
<br>
-----Original Message-----<br>
From: Adam Nemet [<a href="mailto:anemet@apple.com">mailto:anemet@apple.com</a>]<span class="xapple-converted-space"> </span><br>
Sent: Monday, August 18, 2014 09:17<br>
To: Demikhovsky, Elena; Khasanov, Robert<br>
Cc: llvm-commits<br>
Subject: [PATCH][AVX512] Add class to group common template arguments related to vector type<br>
<br>
Hi,<br>
<br>
We discussed the issue of generality vs. readability of the AVX512 classes recently. I proposed this approach to try to hide and centralize the mappings we commonly perform based on the vector type. A new class X86VectorVTInfo captures these.<br>
<br>
The idea is to pass an instance of this class to classes/multiclasses instead of the corresponding ValueType. Then the class/multiclass can use its field for things that derive from the type rather than passing all those as separate arguments.<br>
<br>
I modified avx512_valign to demonstrate this new approach. As you can see instead of 7 related template parameters we now have one. The downside is that we have to refer to fields for the derived values. I named the argument '_' in order to make this as
invisible as possible. Please let me know if you absolutely hate this. (Also once we allow local initializations in multiclasses we can recover the original version by assigning the fields to local variables.)<br>
<br>
Another possible use-case for this class is to directly map things, e.g.:<br>
<br>
RegisterClass KRC = X86VectorVTInfo<32, i16>.KRC<br>
<br>
Please let me know if it looks good.<br>
<br>
Adam<br>
<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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