RE: ATHLON performance tips

[<paul.meehan@amd.com>]

Peter,

You could bias the base address by subtracting a constant, and then use the
offsets to add the constant back in. For example, if 132 is subtracted from
the base address, then all the offsets will be bigger than 128. If the base
address is known at compile time, then a biased base address could be
computed at compile time. However, if the base address is passed in as an
argument of a function, then biasing the base address would have to be done
at run time, incurring the overhead of a sub instruction.

Regards,
Paul