<html><head></head><body bgcolor="#FFFFFF"><div>Where does the -time-passes option say the time is going?<br><br>Sent from my iPhone</div><div><br>On Nov 21, 2011, at 8:58 AM, Michael Smith <<a href="mailto:Michael.Smith@synopsys.com">Michael.Smith@synopsys.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal">I’ve attached a 2 examples of patterns for updating an array. They’re simplified examples of some code generation I’m doing where I need to pass a large, unknown number of arguments (ints, doubles, pointers to other information) to a function.<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">The two patterns are:<o:p></o:p></p><p class="MsoNormal"> Stack[0] = 0;<o:p></o:p></p><p class="MsoNormal"> Stack[1] = 1;<o:p></o:p></p><p class="MsoNormal"> Stack[2] = 42;<o:p></o:p></p><p class="MsoNormal">And<o:p></o:p></p><p class="MsoNormal"> Int I = 0;<o:p></o:p></p><p class="MsoNormal"> Stack[i++] = 0;<o:p></o:p></p><p class="MsoNormal"> Stack[i++] = 1;<o:p></o:p></p><p class="MsoNormal"> Stack[i++] = 42;<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">I’ve found that the optimizer is much faster at handling the 2<sup>nd</sup> pattern than the 1<sup>st</sup>. With 3000 assignments - as in the examples attached – “opt –std-compile-opts –S func1.ll –o func1.opt” takes 10 seconds, while func2.ll takes 0.2s. Anyone have any ideas why?<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">I’ve tested with LLVM 2.9, and LLVM 3.0 RC1.<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Regards,<o:p></o:p></p><p class="MsoNormal">Michael<o:p></o:p></p></div></div></blockquote><blockquote type="cite"><div><opt.zip></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>LLVM Developers mailing list</span><br><span><a href="mailto:LLVMdev@cs.uiuc.edu">LLVMdev@cs.uiuc.edu</a> <a href="http://llvm.cs.uiuc.edu">http://llvm.cs.uiuc.edu</a></span><br><span><a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev</a></span><br></div></blockquote></body></html>