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From: Richard Henderson <rth@redhat.com> To: bkoz@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: libstdc++/8230: Buggy allocator behaviour Date: Thu, 21 Nov 2002 14:01:00 -0000 [thread overview] Message-ID: <20021115224603.14119.qmail@sources.redhat.com> (raw) The following reply was made to PR libstdc++/8230; it has been noted by GNATS. From: Richard Henderson <rth@redhat.com> To: Gabriel Dos Reis <gdr@integrable-solutions.net> Cc: Matt Austern <austern@apple.com>, Benjamin Kosnik <bkoz@redhat.com>, bkoz@gcc.gnu.org, gcc-bugs@gcc.gnu.org, jkanze@caicheuvreux.com, gcc-gnats@gcc.gnu.org, libstdc++@gcc.gnu.org Subject: Re: libstdc++/8230: Buggy allocator behaviour Date: Fri, 15 Nov 2002 14:41:38 -0800 On Thu, Nov 14, 2002 at 11:27:17PM +0100, Gabriel Dos Reis wrote: > Maybe RTH could provide us with some datapoint here? "It depends". > | Second, if the answer to question 1 is "a lot": is there some sensible > | way to use this in the compiler itself? I suppose it'd have to involve > | some ghastly macro hackery because of the bootstrap problem, but > | it we're talking big performance wins, it might be worth it. > > If the answer to the first question is "a lot", then I agree with you > that it makes perfect sense to use it in the compiler itself. I > could imagine something along the lines > > #if !defined(__GNUC__) || __GNUC__ < 3 /* correct the version number */ > # define __builtin_expect(EXP, PROB) EXP > #endif > > in system.h or wherever appropriate. I don't think it's worth it, except _possibly_ in the ENABLE_CHECKING macros. r~
next reply other threads:[~2002-11-15 22:46 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-11-21 14:01 Richard Henderson [this message] -- strict thread matches above, loose matches on Subject: below -- 2002-11-23 1:16 bkoz 2002-11-21 4:06 Gabriel Dos Reis 2002-11-21 3:47 Matt Austern 2002-11-20 23:03 Gabriel Dos Reis 2002-11-20 19:09 Gabriel Dos Reis 2002-11-20 18:20 Benjamin Kosnik 2002-11-20 18:19 Benjamin Kosnik 2002-11-20 18:02 Gabriel Dos Reis 2002-11-20 5:07 bkoz 2002-10-15 5:56 gdr
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