<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Feb 28, 2011, at 2:35 PM, Naznin Fauzia wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi all,<br><br>How Can I get the Loops around an Instruction?<br><br>I know I can get the basic block of an instruction using inst.getParent() which returns a BasicBlock*. Now I want to use the getLoopFor(BasicBlock) method of the class LoopInfo.<br>
But I dont know how to get the LoopInfo.<br><br>BasicBlock* bb = inst.getParent();<br><br>(... what should I add here?)<br><br>Loop* innerloop = LI -> getLoopFor(bb):<br><br></blockquote><br></div><div>Two steps:</div><div>1) In your pass's getAnalysisUsage(), request LoopInfo.</div><div><br></div><div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" face="Courier"> </font></span><font class="Apple-style-span" face="Courier">virtual void getAnalysisUsage(AnalysisUsage &AU) const {</font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" face="Courier"> </font></span><font class="Apple-style-span" face="Courier"> AU.addRequired<LoopInfo>();</font></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" face="Courier"> </font></span><font class="Apple-style-span" face="Courier">}</font></div><div><br></div><div>2) In your runOnLoop() method get the analysis.</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" face="Courier"> </font></span><font class="Apple-style-span" face="Courier">LoopPass *</font><span class="Apple-tab-span" style="white-space:pre"><font class="Apple-style-span" face="Courier">LI = &getAnalysis<LoopInfo>();</font></span></div><div><span class="Apple-style-span" style="white-space: pre;"><br></span></div><div><span class="Apple-style-span" style="white-space: pre;">Now, you can do LI->getLoopFor(...)</span></div><div><span class="Apple-style-span" style="white-space: pre;"><br></span></div><div><span class="Apple-style-span" style="white-space: pre;">-</span></div><div><span class="Apple-style-span" style="white-space: pre;">Devang</span></div><div><br></div></div><br></body></html>