PATCH [1/n] addr32: Properly use Pmode and word_mode

[Uros Bizjak]

On Sat, Nov 12, 2011 at 3:19 AM, H.J. Lu <hongjiu.lu@intel.com> wrote:

> The current x32 implementation uses LEAs to convert 32bit address to
> 64bit.  However, we can use addr32 prefix to use 32bit address directly.
> It improves performance by 5% in SPEC CPU 2K/2006.  All changes are done
> in x86 backend, except for a smaill unwind library assert change:
>
> http://gcc.gnu.org/ml/gcc-patches/2011-11/msg01555.html
>
> due to return column size difference.
>
> For x86-64, Pmode can be 32bit or 64bit, but word_mode is always 64bit.
> push/pop only work on word_mode.  Also string instructions take Pmode
> pointers.
>
> I will submit a set of patches to use 32bit Pmode for x32.  This is
> the first patch to properly use Pmode and word_mode.  It also adds
> addr32 prefix to string instructions if needed.  OK for trunk?

Not for stage3.

Uros.