whitequark bf8db55ef3 opt_expr: improve simplification of comparisons with large constants. ...

The idea behind this simplification is that a N-bit signal X being
compared with an M-bit constant where M>N and the constant has Nth
or higher bit set, it either always succeeds or always fails.

However, the existing implementation only worked with one-hot signals
for some reason. It also printed incorrect messages.

This commit adjusts the simplification to have as much power as
possible, and fixes other bugs.

2019-01-02 15:45:28 +00:00

1.0 KiB

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