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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 Eli,<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'>I didn’t find much info about atomics for targets. I find two attributes are relevant: MaxAtomicPromoteWidth and MaxAtomicInlineWidth, but they cannot be used to compute the macros.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Besides, even for the same target, the macros are dependent on CPU types. For example, for X86 target:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> if (CPU >= CK_i486) {<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");<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'> if (CPU >= CK_i586)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");<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'><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'>Weiming<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'>Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation</span><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'><o:p> </o:p></span></p><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"'> Eli Friedman [mailto:eli.friedman@gmail.com] <br><b>Sent:</b> Monday, September 02, 2013 7:12 PM<br><b>To:</b> Weiming Zhao<br><b>Cc:</b> cfe-commits@cs.uiuc.edu Commits<br><b>Subject:</b> Re: Bug fix 12730: Add support for __GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4,8} on ARM<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Sat, Aug 31, 2013 at 11:51 PM, <<a href="mailto:weimingz@codeaurora.org" target="_blank">weimingz@codeaurora.org</a>> wrote:<o:p></o:p></p><div><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal style='margin-bottom:12.0pt'>Hi,<br><br>The orignal patch (r178816) fixed bug 12730 for x86. This patch adds the<br>same macro definitions "__GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4,8}" to ARM<br>target to address the same issue.<br><br>Please help to review it.<o:p></o:p></p></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Is there any way we can compute the correct setting for these macros in a target-independent code? IIRC, targets already expose some information about atomics.<o:p></o:p></p></div></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>-Eli<o:p></o:p></p></div></div></div></body></html>