<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><base href="x-msg://3013/"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Evan,<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 style='text-indent:9.0pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The attached pdf contains an example of this change. It can result<o:p></o:p></span></p><p class=MsoNormal style='text-indent:9.0pt'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In code size reduction for most of PIC enabled programs.<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'>Thanks,<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'> Yin <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><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><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"'> Evan Cheng [mailto:evan.cheng@apple.com] <br><b>Sent:</b> Tuesday, July 31, 2012 5:48 PM<br><b>To:</b> Yin Ma<br><b>Cc:</b> llvm-commits@cs.uiuc.edu<br><b>Subject:</b> Re: [llvm-commits] [PATCH][Review Please] Optimize ARM Position Independent Code Generation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi Yin,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Can you provide some assembly code so we can understand what you are trying to do?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Evan<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Jul 30, 2012, at 10:55 AM, Yin Ma <<a href="mailto:yinma@codeaurora.org">yinma@codeaurora.org</a>> wrote:<o:p></o:p></p></div><p class=MsoNormal><br><br><o:p></o:p></p><div><p style='margin-bottom:12.0pt;background:white'><span style='font-size:10.5pt;font-family:"Arial","sans-serif"'>Hi</span><o:p></o:p></p><p style='margin-bottom:12.0pt;background:white;background-position:initial initial;background-repeat:initial initial'><span style='font-size:10.5pt;font-family:"Arial","sans-serif"'>Currently LLVM ARM backend is still using the x86 way to generate position independent code. The algorithm retrieves the pointer of global offset table at first. However, GCC has been using the label relative offset to computer position independent code. The GCC way results smaller code size in ARM architecture. This patch is to implement GCC way to generate position independent code.</span><o:p></o:p></p><p style='margin-bottom:12.0pt;background:white;background-position:initial initial;background-repeat:initial initial'><span style='font-size:10.5pt;font-family:"Arial","sans-serif"'>In the attachment.<br>pic.diff is the code patch<br>the rest of four files are the test validation results before and after code changed</span><o:p></o:p></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Please give a review<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Thanks,<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> Yin<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:13.5pt;font-family:"Helvetica","sans-serif"'><report.simple.new.txt><report.simple.org.txt><cross.new><<a href="http://cross.org">cross.org</a>><pic.diff>_______________________________________________<br>llvm-commits mailing list<br><a href="mailto:llvm-commits@cs.uiuc.edu"><span style='color:purple'>llvm-commits@cs.uiuc.edu</span></a><br><a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits"><span style='color:purple'>http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits</span></a><o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>