An unusual Performance approach using Synthetic registers, and a request for guidance.

[Bonzini]

> Orthogonality?  I am sorry.  I do not understand.  Could you be a bit more
> descriptive?

The lack of memory-to-memory move instructions, for example.  Synthetic
registers would have to be moved inside the core to do arithmetic on them.
It's already a problem not to have three-operand math, synthetic registers
would make the x86 basically an accumulator-based chip (move from reg to
accumulator, sum accumulator to reg) and also limit the ability to use LEA
to do arithmetics.

Paolo