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<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:36.0pt">
<a name="_MailEndCompose"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"><br>
> so I think we need to use non-extending load for element size less than 8bit on "DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT" like this roughly.</span><o:p></o:p></a></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222">> if (N->getOperand(0).getValueType().getVectorElementType().getSizeInBits() < 8) {<br>
> return DAG.getLoad(N->getValueType(0), dl, Store, StackPtr, MachinePointerInfo());<br>
> } else {<br>
> return DAG.getExtLoad(ISD::EXTLOAD, dl, N->getValueType(0), Store, StackPtr, MachinePointerInfo(), EltVT);<br>
> }</span><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">I assume that we need the opposite -
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">if (.. < 8)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> getExtLoad // VT should be MVT::i8, MemVT should be MVT::i1<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">else<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> getLoad<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" style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![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]><span dir="LTR"></span><b><i><span style="color:#2F5496"> 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" style="margin-left:36.0pt"><a name="_____replyseparator"></a><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">
jingu@codeplay.com [mailto:jingu@codeplay.com] <br>
<b>Sent:</b> Monday, September 18, 2017 13:40<br>
<b>To:</b> Demikhovsky, Elena <elena.demikhovsky@intel.com>; daniel_l_sanders@apple.com <daniel_l_sanders@apple.com>; Jon Chesterfield <jonathanchesterfield@gmail.com><br>
<b>Cc:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> Re: Question about 'DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT'<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
<p style="margin-left:36.0pt">um... In order to reproduce the issue, we need to add 'i1' register class and avoid all vector register class on TargetLowering class... I am getting the issue on my custom target. I will try to find the existing target to reproduce
the issuet but I am not sure whether the existing targets can reproduce the issue or not...<o:p></o:p></p>
<p style="margin-left:36.0pt">Thanks,<o:p></o:p></p>
<p style="margin-left:36.0pt">JinGu Kang<o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">On 17/09/17 06:40, Demikhovsky, Elena wrote:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Please open a bugzilla ticket and attach your testcase. It will allow us to debug and fix the problem.</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="font-family:"Calibri",sans-serif"><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:#2F5496"> Elena</span></i></b><o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"> JinGu [<a href="mailto:jingu@codeplay.com">mailto:jingu@codeplay.com</a>]
<br>
<b>Sent:</b> Saturday, September 16, 2017 00:38<br>
<b>To:</b> Demikhovsky, Elena <a href="mailto:elena.demikhovsky@intel.com"><elena.demikhovsky@intel.com></a>;
<a href="mailto:daniel_l_sanders@apple.com">daniel_l_sanders@apple.com</a> <a href="mailto:daniel_l_sanders@apple.com">
<daniel_l_sanders@apple.com></a>; Jon Chesterfield <a href="mailto:jonathanchesterfield@gmail.com">
<jonathanchesterfield@gmail.com></a><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: Question about 'DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT'</span><o:p></o:p></p>
</div>
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<p class="MsoNormal" style="margin-left:72.0pt"> <o:p></o:p></p>
<p style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Hi Elena,</span><o:p></o:p></p>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks for your response.<br>
<br>
The store is ok but the extending load generates assertion after the store because MemVT is i8 and VT is i1 on following line.</span>
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:72.0pt">
<span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222"><br>
assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) && "Should only be an extending load, not truncating!")<br>
<br>
so I think we need to use non-extending load for element size less than 8bit on "DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT" like this roughly.</span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222">if (N->getOperand(0).getValueType().getVectorElementType().getSizeInBits() < 8) {<br>
return DAG.getLoad(N->getValueType(0), dl, Store, StackPtr, MachinePointerInfo());<br>
} else {<br>
return DAG.getExtLoad(ISD::EXTLOAD, dl, N->getValueType(0), Store, StackPtr, MachinePointerInfo(), EltVT);<br>
}</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-family:"Arial",sans-serif;color:#222222"> </span><o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222">How do you think about it?</span><o:p></o:p></p>
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<div>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-family:"Arial",sans-serif;color:#222222"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222">Thanks,</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:72.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#222222">JinGu Kang</span><o:p></o:p></p>
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</div>
<p class="MsoNormal" style="margin-left:72.0pt"> <o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-left:72.0pt">On 15/09/2017 18:42, Demikhovsky, Elena wrote:<o:p></o:p></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre style="margin-left:72.0pt">extends the elements to 8bit and stores them on stack.<o:p></o:p></pre>
</blockquote>
<pre style="margin-left:72.0pt">Store is responsible for zero-extend. This is the policy...<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">- Elena<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">-----Original Message-----<o:p></o:p></pre>
<pre style="margin-left:72.0pt">From: <a href="mailto:jingu@codeplay.com">jingu@codeplay.com</a> [<a href="mailto:jingu@codeplay.com">mailto:jingu@codeplay.com</a>] <o:p></o:p></pre>
<pre style="margin-left:72.0pt">Sent: Friday, September 15, 2017 17:45<o:p></o:p></pre>
<pre style="margin-left:72.0pt">To: <a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>; Demikhovsky, Elena <a href="mailto:elena.demikhovsky@intel.com"><elena.demikhovsky@intel.com></a>; <a href="mailto:daniel_l_sanders@apple.com">daniel_l_sanders@apple.com</a><o:p></o:p></pre>
<pre style="margin-left:72.0pt">Subject: Re: Question about 'DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT'<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">Can someone give the comment about it please?<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">Thanks,<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">JinGu Kang<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">On 14/09/17 12:05, <a href="mailto:jingu@codeplay.com">jingu@codeplay.com</a> wrote:<o:p></o:p></pre>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre style="margin-left:72.0pt">Hi All,<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">I have a question about splitting 'EXTRACT_VECTOR_ELT' with 'v2i1'. I <o:p></o:p></pre>
<pre style="margin-left:72.0pt">have a llvm IR code snippet as following:<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">llvm IR code snippet:<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">for.body: ; preds = %entry, <o:p></o:p></pre>
<pre style="margin-left:72.0pt">%for.cond<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %i.022 = phi i32 [ 0, %entry ], [ %inc, %for.cond ]<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %0 = icmp ne <2 x i32> %vecinit1, <i32 0, i32 -23><o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %1 = extractelement <2 x i1> %0, i32 %i.022<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %vecext4 = extractelement <2 x i32> %vecinit1, i32 %i.022<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %vecext5 = extractelement <2 x i32> <i32 0, i32 -23>, i32 %i.022<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %cmp6 = icmp ne i32 %vecext4, %vecext5<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> %cmp7 = xor i1 %1, %cmp6<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">...<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">and the SelectionDAG before TypeLegalizer is like this.<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t0: ch = EntryToken<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t2: i32,ch = CopyFromReg t0, Register:i32 %vreg0<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t3: ch = ValueType:i32<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t5: i32,ch = CopyFromReg t2:1, Register:i32 %vreg1<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t7: i32 = AssertZext t5, ValueType:ch:i1<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t8: v2i32 = BUILD_VECTOR t2, t7<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t11: v2i32 = BUILD_VECTOR Constant:i32<0>, Constant:i32<-23><o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t15: i32,ch = CopyFromReg t0, Register:i32 %vreg2<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t22: i32 = add t15, Constant:i32<1><o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t24: ch = CopyToReg t0, Register:i32 %vreg3, t22<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t27: ch = CopyToReg t0, Register:i32 %vreg8, Constant:i32<-1><o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t31: ch = TokenFactor t24, t27<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t13: v2i1 = setcc t8, t11, setne:ch<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t16: i1 = extract_vector_elt t13, t15<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t17: i32 = extract_vector_elt t8, t15<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t18: i32 = extract_vector_elt t11, t15<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t19: i1 = setcc t17, t18, setne:ch<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> t20: i1 = xor t16, t19<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">...<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">I have not added any vector register class so 'DAGTypeLegalizer' tries <o:p></o:p></pre>
<pre style="margin-left:72.0pt">to split the "t16: i1 = extract_vector_elt t13, t15" because t13's <o:p></o:p></pre>
<pre style="margin-left:72.0pt">result type is 'v2i1'. If the size of vector element is less than <o:p></o:p></pre>
<pre style="margin-left:72.0pt">8bit, 'DAGTypeLegalizer::SplitVecOp_EXTRACT_VECTOR_ELT()' function <o:p></o:p></pre>
<pre style="margin-left:72.0pt">extends the elements to 8bit and stores them on stack. Finally, the <o:p></o:p></pre>
<pre style="margin-left:72.0pt">function generates 'ExtLoad' to load specific element. But if the <o:p></o:p></pre>
<pre style="margin-left:72.0pt">element's size is less than 8bit, I think it could be wrong. It looks <o:p></o:p></pre>
<pre style="margin-left:72.0pt">it needs just 'Load' or "Load and Truncate" to match the result type <o:p></o:p></pre>
<pre style="margin-left:72.0pt">of 'EXTRACT_VECTOR_ELT'. How do you think about it? If I missed <o:p></o:p></pre>
<pre style="margin-left:72.0pt">something, please let me know.<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">Thanks,<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
<pre style="margin-left:72.0pt">JinGu Kang<o:p></o:p></pre>
<pre style="margin-left:72.0pt"> <o:p></o:p></pre>
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