x32 psABI draft version 0.2

[Andrew Pinski]

On Wed, Feb 16, 2011 at 12:35 PM, Chris Metcalf <cmetcalf@tilera.com> wrote:
> For what it's worth, the Tilera 64-bit architecture (forthcoming) includes
> support for a 32-bit compatibility layer that is similar to x32.  It uses
> 64-bit registers throughout (e.g. for double and long long), but 32-bit
> addresses.  The addresses between 2GB and 4GB are not directly usable as
> 64-bit addresses since we sign-extend all 32-bit values to make the ISA
> more straightforward.  We use the "compat" layer to provide our syscall
> table, since we don't have a traditional compatibility layer in this mode
> (unlike x86_64 and i386).

This sounds more like MIPS' n32 than x32 really.

-- Pinski