Author: Russell Reagan
Date: 15:14:28 03/30/04
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On March 30, 2004 at 16:20:52, Dieter Buerssner wrote: >On March 30, 2004 at 02:34:21, Slater Wold wrote: > >>64-bit Arasan compiled with: -O2 -Ot -Og -Oi -Gr -GX -Oy -Ob2 -GL > >For my programs (and I don't have any 64-bit environments), omitting -Ob2 was >always faster. The same when using GCC - allowing it to inline everything >suitable produces slower code. In really time critical applications, where I >thought that some functions should be inlined, I noted so to the compiler >(__force_inline/__inline__). Letting the compiler chose itself seemed always >worse. > >Regards, >Dieter I think that with the latest VC++ you do not have the option to turn of inlining, and the default is to "inline any suitable". Last night I was trying to profile a chess program, and I wanted to turn off all inlining so that all functions would show up in the profile. I had to use gcc and gprof, because the default in VC++ .NET 2003 is to inline any suitable function, and I couldn't find any option to turn of inlining. gcc has -fno-inline. Well, actually I changed the setting in VC++ to only inline if the function was declared __inline, but even then, I was not sure if all functions were not inlined. From this webpage, it says: http://msdn.microsoft.com/chats/vstudio/vstudio_032703.asp "Q: Is there a good rule of thumb when to use inline functions or not? A: Starting with VC7.0, auto-inlining (-Ob2) is on by default. This means that all functions are inline candidates. We do slightly favor functions marked as inline in some cases however. In general, marking function as inline will not change much. A function can only be inlined if the call site and the definition are visible to the compiler, so the definition needs to be in a header file or you want to use link-time-codegen. In general, small functions that are called frequently are the best candidates. Function with constants passed as arguments are also good."
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