use gcc __builtin functions
---------------------------
Key: STDCXX-544
URL: https://issues.apache.org/jira/browse/STDCXX-544
Project: C++ Standard Library
Issue Type: Improvement
Components: Build
Affects Versions: 4.1.3
Environment: gcc
Reporter: Mark Brown
Gcc provides many built-in equivalents of C library functions like memcpy or
strlen for optimization purposes. stdcxx should take advantage of them when
possible to deliver better performance.
http://gcc.gnu.org/onlinedocs/gcc-4.1.2/gcc/Other-Builtins.html#Other-Builtins
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