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<span style="font-kerning: none;">Hi Wei-Ren,</span></p>
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<span style="font-kerning: none;">Thanks for your reply. </span></p>
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<span style="font-kerning: none;">I use --debug-pass=Structure and it says Loop access analysis pass is executed before my pass. The interesting part is when I use -mem2reg and -loop-rotate it returns dependence information. I have no idea how to explain that.
I would be great if one could help me with it. Thanks in advance.</span></p>
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<span style="font-kerning: none;">Best,</span></p>
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<span style="font-kerning: none;">Kewen</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> llvm-dev <llvm-dev-bounces@lists.llvm.org> on behalf of 陳韋任 via llvm-dev <llvm-dev@lists.llvm.org><br>
<b>Sent:</b> Thursday, February 8, 2018 7:06:30 AM<br>
<b>To:</b> Kewen Meng<br>
<b>Cc:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> Re: [llvm-dev] Question about using LoopAccessLegacyAnalysis</font>
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<div class="x_gmail_default" style="font-family:arial,helvetica,sans-serif">Have you check `LoopAccessLegacyAnalysis::runOnFunction` ran as you expect? Besides, I am not sure if <span style="color:rgb(34,34,34); font-family:arial,helvetica,sans-serif; font-size:small; font-style:normal; font-weight:400; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; background-color:rgb(255,255,255); float:none; display:inline">`LoopAccessLegacyAnalysis::runOnFunction`
does anything useful, have you check that, too?</span></div>
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<div class="x_gmail_quote">2018-02-08 1:49 GMT+08:00 Kewen Meng via llvm-dev <span dir="ltr">
<<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>></span>:<br>
<blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
Hi LLVM community,<br>
<br>
I am writing a custom pass for analyzing the dependence information for the memory access within a loop. I found “LoopAccessLegacyAnalysis” class useful, however I m not able to obtain information from that pass. Here is what I did to get the information:<br>
<br>
// require pass<br>
virtual void getAnalysisUsage(AnalysisUsage &AU) const<br>
{<br>
AU.addRequired<<wbr>LoopInfoWrapperPass>();<br>
AU.addRequired<<wbr>LoopAccessLegacyAnalysis>();<br>
AU.setPreservesAll();<br>
}<br>
<br>
// processing<br>
virtual bool runOnFunction(Function &F) {<br>
LoopInfo &li = getAnalysis<<wbr>LoopInfoWrapperPass>().<wbr>getLoopInfo();<br>
LoopAccessLegacyAnalysis &lala = getAnalysis<<wbr>LoopAccessLegacyAnalysis>();<br>
<br>
for(LoopInfo::iterator lp = li.begin(); lp != li.end(); lp++)<br>
{<br>
Loop *loop = *lp;<br>
const LoopAccessInfo &lai = lala.getInfo(loop);<br>
<br>
// need help here<br>
// I can’t get any information from the LoopAccessInfo instance.<br>
errs()<<lai.getNumLoads(); // return 0<br>
}<br>
}<br>
<br>
<br>
// register<br>
static RegisterPass<SkeletonPass> X("test", "test for using the existing pass",<br>
“false",<br>
“false”);<br>
<br>
<br>
I must be missing something important. Any response would be greatly appreciated!<br>
<br>
Thanks,<br>
Kewen<br>
<br>
<br>
<br>
<br>
Best regards,<br>
Kewen<br>
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-- <br>
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<div>Wei-Ren Chen (陳韋任)<br>
Homepage: <a href="https://people.cs.nctu.edu.tw/~chenwj" target="_blank">https://people.cs.nctu.edu.tw/~chenwj</a></div>
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