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From: rearnsha@gcc.gnu.org To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, gertom@rgai.hu, nobody@gcc.gnu.org Subject: Re: target/9757: Gcc should use swp instruction in ARM targets Date: Thu, 20 Feb 2003 12:13:00 -0000 [thread overview] Message-ID: <20030220121324.26937.qmail@sources.redhat.com> (raw) Synopsis: Gcc should use swp instruction in ARM targets State-Changed-From-To: open->closed State-Changed-By: rearnsha State-Changed-When: Thu Feb 20 12:13:24 2003 State-Changed-Why: No, the SWP instruction should not be used. For several reasons. 1) It's very slow on some processors, since it forces an external bus access even if the data is already in the cache. 2) It's behaviour is not defined if access is made to a MMU managed page that is non-cacheable/bufferable. http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9757
next reply other threads:[~2003-02-20 12:13 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-02-20 12:13 rearnsha [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-02-19 16:56 gertom
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