| To: | "Maciej W. Rozycki" <macro@ds2.pg.gda.pl> |
|---|---|
| Subject: | Re: 64-bit and N32 kernel interfaces |
| From: | Daniel Jacobowitz <dan@debian.org> |
| Date: | Thu, 5 Sep 2002 11:14:09 -0400 |
| Cc: | Hartvig Ekner <hartvige@mips.com>, "Kevin D. Kissell" <kevink@mips.com>, Tor Arntsen <tor@spacetec.no>, Carsten Langgaard <carstenl@mips.com>, Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org |
| In-reply-to: | <Pine.GSO.3.96.1020905170830.7444E-100000@delta.ds2.pg.gda.pl> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <20020905145954.GA17383@nevyn.them.org> <Pine.GSO.3.96.1020905170830.7444E-100000@delta.ds2.pg.gda.pl> |
| Sender: | linux-mips-bounce@linux-mips.org |
| User-agent: | Mutt/1.5.1i |
On Thu, Sep 05, 2002 at 05:10:51PM +0200, Maciej W. Rozycki wrote: > On Thu, 5 Sep 2002, Daniel Jacobowitz wrote: > > > No - the point is that all data types have the same size in N32. It > > was created explicitly as a transitional sop for people who didn't want > > to fix their code, but wanted a performance increase from their 64-bit > > hardware. > > Well, what's the performance increase of n32 over o32? The increased > number of argument registers? I doubt it's noticeable in most cases. N32 supports saving and restoring 64-bit registers, which O32 doesn't - according to some comments in GCC, O32 is in fact incompatible with using 64-bit operations. -- Daniel Jacobowitz MontaVista Software Debian GNU/Linux Developer |
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