x32 psABI draft version 0.2
Andrew Pinski
pinskia@gmail.com
Wed Feb 16 20:57:00 GMT 2011
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
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