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Re: [PATCH] Speed up single-threaded case of atomic ops and reduce text size


Paolo Carlini wrote:

I'm guilty of having rushed Richard to post this patch (sorry!), which, in general, I like indeed. However, it has to wait a bit for us (v3 maintainers) to carefully weigh the delicate points raised in the discussion thread with Hans about volatile & single-thread & signals... Thanks for the patience, Richard.

... by the way, the patch, as-is, triggers a warning:


/home/paolo/Gcc/svn-dirs/trunk-build/i686-pc-linux-gnu/libstdc++-v3/include/bits/atomicity.h: In function '_Atomic_word __gnu_cxx::__exchange_and_add_single(volatile _Atomic_word*, int)':
/home/paolo/Gcc/svn-dirs/trunk-build/i686-pc-linux-gnu/libstdc++-v3/include/bits/atomicity.h:65: warning: cast from type 'volatile _Atomic_word*' to type '_Atomic_word*' casts away constness
/home/paolo/Gcc/svn-dirs/trunk-build/i686-pc-linux-gnu/libstdc++-v3/include/bits/atomicity.h: In function 'void __gnu_cxx::__atomic_add_single(volatile _Atomic_word*, int)':
/home/paolo/Gcc/svn-dirs/trunk-build/i686-pc-linux-gnu/libstdc++-v3/include/bits/atomicity.h:73: warning: cast from type 'volatile _Atomic_word*' to type '_Atomic_word*' casts away constness


Paolo.


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