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Re: volatile qualifier hurts single-threaded optimized case
- From: Paolo Carlini <pcarlini at suse dot de>
- To: Richard Guenther <richard dot guenther at gmail dot com>
- Cc: gcc at gcc dot gnu dot org, libstdc++ <libstdc++ at gcc dot gnu dot org>
- Date: Sun, 13 Aug 2006 11:53:22 +0200
- Subject: Re: volatile qualifier hurts single-threaded optimized case
- References: <84fc9c000608130242y5b25f33ap2dabc1ec7d19cd31@mail.gmail.com>
Richard Guenther wrote:
bits/atomicity.h has volatile qualifiers on the _Atomic_word*
arguments to
the __*_single and __*_dispatch variants of the atomic operations. This
huts especially the single-threaded optimization variants which are
usually
inlined. Removing those qualifiers allows to reduce code size
significantly
as can be seen in the following simple testcase
Ok, what can be done, realistically, considering that __exchange_and_add
and __atomic_add are exported, thus in any case cannot change signature,
and, if possible, we would rather avoid too ugly casts?
Thanks,
Paolo.