2454ad99bf
Refactor "opt_rmdff -sat"
...
Signed-off-by: Clifford Wolf <clifford@clifford.at>
2019-06-20 13:44:21 +02:00
9a468f81c4
Optimizing DFFs whose initial value prevents their value from changing
...
This is a proof of concept implementation that invokes SAT solver via Pass::call
method.
2019-05-28 08:48:21 +02:00
25680f6a07
Fix WREDUCE on FF not fixing ARST_VALUE parameter.
...
Adds test case that fails without code change.
Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
2019-02-22 10:30:42 -08:00
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
4fd458290c
opt_expr: refactor simplification of unsigned X<onehot and X>=onehot. NFCI.
2019-01-02 05:11:29 +00:00
9e9846a6ea
opt_expr: refactor simplification of signed X>=0 and X<0. NFCI.
2019-01-02 03:01:25 +00:00
8e53d2e0bf
opt_expr: simplify any unsigned comparisons with all-0 and all-1.
...
Before this commit, only unsigned comparisons with all-0 would be
simplified. This commit also makes the code handling such comparisons
to be more rigorous and not abort on unexpected input.
2019-01-02 02:45:49 +00:00
42c356c49c
opt_lut: eliminate LUTs evaluating to constants or inputs.
2018-12-31 23:55:40 +00:00
2a681909df
Merge pull request #724 from whitequark/equiv_opt
...
equiv_opt: new command, for verifying optimization passes
2018-12-16 15:54:26 +01:00
7ff5a9db2d
equiv_opt: pass -D EQUIV when techmapping.
...
This allows avoiding techmap crashes e.g. because of large memories
in white-box cell models.
2018-12-07 17:20:34 +00:00
c38ea9ae65
equiv_opt: new command, for verifying optimization passes.
2018-12-07 17:20:34 +00:00
7ec740b7ad
opt_lut: leave intact LUTs with cascade feeding module outputs.
2018-12-07 17:13:52 +00:00
45cb6200af
opt_lut: add -dlogic, to avoid disturbing logic such as carry chains.
2018-12-05 16:30:37 +00:00
9e072ec21f
opt_lut: new pass, to combine LUTs for tighter packing.
2018-12-05 16:30:37 +00:00
Clifford Wolf
Bogdan Vukobratovic
Keith Rothman
whitequark