Enable 32-bit Alignment

[Alan Modra]

On Fri, Jun 29, 2007 at 03:57:01PM -0500, Menezes, Evandro wrote:
> If it's not too late in the release cycle, I'd appreciate if this patch
> enabling optimal code alignment up to 32-byte boundaries, used by GCC
> when tuning for AMD Barcelona, were applied.  It also does away with the
> special NOP sequences for AMD Opteron in 64-bit code.

In the current i386_align_code, see comment "Adjust jump offset" in
block handling 16-bit mode.  Now that larger nop sequences are
allowed, I think you should similarly adjust a branch (if used) in
32-bit mode.  Also, your code sequence for 31 byte nop padding will
not be very good.  You'll get two 15 byte nops and a single nop.
Please rethink the way you have implemented this.

-- 
Alan Modra
IBM OzLabs - Linux Technology Centre