Re: Optimizing empty functions in C

"Mark Lacey \[MSFT\]" <mlacey@microsoft.com>
20 Jun 2002 21:58:13 -0400

          From comp.compilers
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From: "Mark Lacey \[MSFT\]" <mlacey@microsoft.com>
Newsgroups: comp.compilers
Date: 20 Jun 2002 21:58:13 -0400
Organization: Compilers Central
References: 02-06-025 02-06-042
Keywords: C, optimize
Posted-Date: 20 Jun 2002 21:58:13 EDT

> [What do C++ compilers do? Identical functions in C++ are pretty common
> when using templates, particularly templates for container classes that
> don't interpret the data they're containing. -John]


The Microsoft Visual C++ toolset will eliminate duplicated functions
through a process it calls "identical COMDAT folding" (ICF). By
specifying -O1 or -O2 for the compilation and -opt:icf as a link
option, you get this effect. For elimination of (statically)
unreferenced functions, you again need either -O1 or -O2 on the
compilation and -opt:ref as a link option. -opt:ref implies -opt:icf
by default.
--
Mark Lacey
mlacey at microsoft dot com
Microsoft Visual C++ Program Management

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