yosys

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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

.gitignore

opt_lut: new pass, to combine LUTs for tighter packing.

2018-12-05 16:30:37 +00:00

opt_expr_cmp.v

opt_expr: improve simplification of comparisons with large constants.

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

opt_expr_cmp.ys

opt_expr: simplify any unsigned comparisons with all-0 and all-1.

2019-01-02 02:45:49 +00:00

opt_lut_elim.il

opt_lut: eliminate LUTs evaluating to constants or inputs.