Date: Sat, 3 Apr 2004 18:23:54 +0100 From: Doug Rabson <dfr@nlsystems.com> To: Daniel Eischen <eischen@vigrid.com> Cc: Julian Elischer <julian@elischer.org> Subject: Re: PERFORCE change 50188 for review Message-ID: <200404031823.54815.dfr@nlsystems.com> In-Reply-To: <Pine.GSO.4.10.10404021517230.4657-100000@pcnet5.pcnet.com> References: <Pine.GSO.4.10.10404021517230.4657-100000@pcnet5.pcnet.com>
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On Friday 02 April 2004 21:22, Daniel Eischen wrote: > On Fri, 2 Apr 2004, Julian Elischer wrote: > > > > The SUN API allows the destination of the %gs:0 to be changes at > > runtime by the user this allowing the UTS to switch threads "on the > > fly" without going back to the kernel. > > Yes, please, I don't see how the one extra indirection is > really going to affect much. This is where we intended to > go months ago (and years ago WRT KSE in general), and > everything has been designed around it. I was just wandering around the internet looking at the scenery and I ended up here: http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86-64-Options.html. This document describes a new options (which is not supported by the compiler in current right now), -mno-tls-direct-seg-refs. This looks like it will do everything we need for both i386 and amd64, i.e. instead of code like: movl %gs:x@ntpoff, %eax it should generate: movl %gs:0, %eax movl x@ntpoff(%eax), %eax Although I'm still not quite convinced that we can't do the first version with essentially zero cost for i386 at least.
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