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</o:shapelayout></xml><![endif]--></head><body lang=EN-IE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>When either ‘</span><span style='font-size:12.0pt;font-family:"Courier New";color:black'>-pg</span><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>’ or ‘</span><span style='font-size:12.0pt;font-family:"Courier New";color:black'>-finstrument-functions</span><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>’ is used, the compiler inserts the appropriate profiling hooks. This happens prior to inlining, so the hooks remain in place.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>Normally this is fine, but with C++ and the heavy use of inline functions and templates, there can be a vast number of trivial functions that are normally optimised away; but with the instrumentation hooks present, this does not happen and the code becomes severely larger and more expensive to execute. Also, because of this, the program being profiled does not even approximately resemble the normal program with no profiling hooks, so the data gathered is of little use.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>My question is whether there are any mechanisms in LLVM to control what functions get instrumented; for instance ‘</span><span style='font-size:12.0pt;font-family:"Courier New";color:black'>#pragma</span><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>’s that can be added to the code, especially headers, that can be used to disable the instrumentation of large groups of functions. Or an option to remove the instrumentation during inlining?<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>But I really do need a way of preventing the instrumentation of large numbers of functions is a simple way.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'> MartinO<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Book Antiqua","serif";color:black'><o:p> </o:p></span></p></div></body></html>