From: David Edelsohn <dje@watson.ibm.com>
To: "David S. Miller" <davem@jenolan.rutgers.edu>
Cc: law@cygnus.com, burley@gnu.ai.mit.edu, egcs@cygnus.com
Subject: Re: Some Haifa scheduler bugs
Date: Thu, 04 Sep 1997 14:38:00 -0000 [thread overview]
Message-ID: <9709042138.AA23328@rios1.watson.ibm.com> (raw)
In-Reply-To: <199709041832.OAA10124@jenolan.rutgers.edu>
>>>>> "David S Miller" writes:
Jeff> I'm less familiar with how this works under aix or with
Jeff> ultrasparcs/solaris, but I assume they both do something relatively
Jeff> reasonable.
David> Naturally, this depends upon OS support, and I think Solaris does map
David> page 0 in this special way, or they check the load instruction which
David> was executed by the user once the fault handling call chain determines
David> that the access was in outer space.
The IBM XL compilers have a switch to disable the speculative load
optimization, but AIX does not have any way to make loads from page 0
generate a fault -- it is a general feature provided by the OS without
user control. Neither the POWER/PowerPC architecture nor the executable
header have any selectable switch to enable or disable that general
functionality.
David
next prev parent reply other threads:[~1997-09-04 14:38 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.SOL.3.90.970826140826.2901J-100000@maigret.informatik.rwth-aachen.de>
1997-09-01 20:33 ` Jeffrey A Law
1997-09-03 9:30 ` Bernd Schmidt
1997-09-03 9:37 ` Jeffrey A Law
1997-09-03 9:44 ` Bernd Schmidt
1997-09-03 10:07 ` Jeffrey A Law
1997-09-05 7:15 ` Bernd Schmidt
1997-09-05 7:55 ` Jeffrey A Law
1997-09-05 8:33 ` Ian Lance Taylor
1997-09-03 11:58 ` Jim Wilson
1997-09-04 1:16 ` regparm & other gcc bug Martynas Kunigelis
1997-09-05 9:29 ` Kamil Iskra
1997-09-06 5:19 ` Martynas Kunigelis
1997-09-03 11:39 ` Some Haifa scheduler bugs Paul Koning
1997-09-03 11:50 ` David Edelsohn
1997-09-03 13:13 ` Richard Henderson
1997-09-03 13:19 ` Jeffrey A Law
1997-09-04 9:33 ` Craig Burley
1997-09-04 11:12 ` Jeffrey A Law
1997-09-04 11:33 ` David S. Miller
1997-09-04 14:38 ` David Edelsohn [this message]
1997-09-04 11:27 meissner
[not found] <Pine.SOL.3.90.970826141030.2901K-100000@maigret.informatik.rwth-aachen.de>
1997-09-01 20:42 ` Jeffrey A Law
-- strict thread matches above, loose matches on Subject: below --
1997-08-26 14:34 Bernd Schmidt
1997-08-22 13:53 Building of generated parser files Andreas Schwab
1997-08-22 15:02 ` Some Haifa scheduler bugs Jeffrey A Law
1997-08-22 15:24 ` Jeffrey A Law
1997-08-22 10:48 Building of generated parser files Niklas Hallqvist
1997-08-22 13:28 ` Some Haifa scheduler bugs Bernd Schmidt
1997-08-21 16:51 Problems on PowerPC David Edelsohn
1997-08-21 17:43 ` Some Haifa scheduler bugs Jeffrey A Law
1997-08-21 15:20 egcs repository Joel Sherrill
1997-08-21 15:47 ` Some Haifa scheduler bugs Bernd Schmidt
1997-08-19 19:00 Jeffrey A Law
1997-08-19 17:54 Jeffrey A Law
1997-08-19 7:36 egcs: A new compiler project to merge the existing GCC forks (fwd) Robert Wilhelm
1997-08-19 9:34 ` Some Haifa scheduler bugs Bernd Schmidt
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