[RFA (revised)] sh-sim, expand the opcode table

[Joern Rennecke]

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> Hi Joern,
> 
> Here are some benchmark results.  Following your advice, I took the
> arith-rand test, increased its main loop count until it took around
> 10 seconds to run on my test machine, and tested it against the eight
> optimization combinations that are tested for in the gcc torture test
> [see methodology notes attached]
> 
> 
> I found that my change increased the runtime by 1.5 to 2 percent
> (even when I added the new instructions that I'm working on).

Was that with or without ACE_FAST ?

> That didn't seem too bad to me, but I took some advice from Alex
> Oliva and tried simply changing the sh_jmp_table from char to short.
> This much simpler change increased the runtime by only 0.5 to 1
> percent, at the cost of 64k more data space.

That makese sense... but what is the cost of adding the new instructions?