[libre-riscv-dev] CAM multiple match policy

[Luke Kenneth Casson Leighton]

also i just removed the comparator against "1", replacing it with a
simple binary/bool test.  the comparison against "1" resulted in a
comparator being required.

likewise for the comparison against zero.  i removed that, and swapped
the order of the if / else.

the yosys graph is now much *much* smaller and more compact.

also... some of the code (hardware) in the loop doesn't depend on the
index value, can you review / check that?
commit 43cd15994910a0803fb77d2a830e4a12b2f61608 (HEAD -> master)

basically if the encoder.n is non-zero, the address should be
outputted... but the hardware to do that testing doesn't have to be
done N times, it only needs one piece of hardware!

hmmm... also...i'm woonderiiiing.... if the code (hardware) inside the
loop would be better placed in [yet another] module.  the for-loop is
auto-generating duplicated code (which is exactly what it's supposed
to do), however it's making it really unclear to be able to follow
what's going on.

what do you think?

l.