From: Grant Grundler <iod00d@hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: Inefficient ia64 system call implementation in glibc
Date: Fri, 19 Sep 2003 17:29:41 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106399259315719@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106398916511816@msgid-missing>
On Fri, Sep 19, 2003 at 09:32:18AM -0700, H. J. Lu wrote:
> The inline ia64 system call assumes all values passed to kernel are
> signed 64bit. It does sign extension if the incoming arg is not signed
> 64bit.
AFAIK, All compilers do this. The HPUX performance team was on a rampage
to replace signed variables with "unsigned" whereever possible just for
this reason.
See example 2 in section "4.5.1 Data Types" (page 16 of 17):
http://devresource.hp.com/STK/partner/PA_PerfGuide_vs2.pdf
BTW, don't dismiss this just because it talks about parisc.
I'd guess +90% of this paper applies to ia64 as well.
grant
next prev parent reply other threads:[~2003-09-19 17:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-19 16:32 Inefficient ia64 system call implementation in glibc H. J. Lu
2003-09-19 17:29 ` Grant Grundler [this message]
2003-09-19 21:46 ` John Worley
2003-09-19 23:32 ` Jim Hull
2003-09-20 13:01 ` Andreas Schwab
2003-09-21 21:04 ` Richard Henderson
2003-09-22 19:39 ` H. J. Lu
2003-09-22 21:25 ` David Mosberger
2003-09-22 23:21 ` Richard Henderson
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