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29 Commits

Author SHA1 Message Date
Eddie Hung 6f971470f8 Respect opt_expr -keepdc as per @cliffordwolf 2019-08-22 08:37:27 -07:00
Eddie Hung 379f33af54 Handle $shift and Y_WIDTH > 1 as per @cliffordwolf 2019-08-22 08:22:23 -07:00
Eddie Hung bb1a8a0190 Add test 2019-08-21 21:58:20 -07:00
Eddie Hung e34f2de55d Merge remote-tracking branch 'origin/master' into clifford/testfast 2019-08-18 21:29:15 -07:00
whitequark 101235400c
Merge branch 'master' into eddie/pr1266_again 2019-08-18 08:04:10 +00:00
Eddie Hung 12c692f6ed Revert "Merge pull request #1280 from YosysHQ/revert-1266-eddie/ice40_full_adder" 
This reverts commit c851dc1310, reversing
changes made to f54bf1631f.
 2019-08-12 12:06:45 -07:00
David Shah f9020ce2b3
Revert "Wrap SB_LUT+SB_CARRY into $__ICE40_CARRY_WRAPPER" 2019-08-10 17:14:48 +01:00
Eddie Hung 2b6cdfb39f Move tests/various/opt* into tests/opt/ 2019-08-07 21:35:48 -07:00
Eddie Hung d5e8c0e6d3 Remove ice40_unlut call, simply do equiv_opt on synth_ice40 2019-08-07 21:33:56 -07:00
Eddie Hung 4545bf482f Remove tests/opt/opt_ff.{v,ys} as they don't seem to do anything but run 2019-08-07 16:48:38 -07:00
Bogdan Vukobratovic 067b44938c Fix wrong results when opt_share called before opt_clean 2019-08-07 09:30:58 +02:00
Bogdan Vukobratovic d8be5ce6ba Tabs to spaces in opt_share examples 2019-08-03 12:35:46 +02:00
Bogdan Vukobratovic 280c4e7794 Fix spacing in opt_share tests, change wording in opt_share help 2019-08-03 12:28:46 +02:00
Bogdan Vukobratovic c075486c59 Reimplement opt_share to work on $alu and $pmux 2019-07-28 16:03:54 +02:00
Bogdan Vukobratovic 07c4a7d438 Implement opt_share 
This pass identifies arithmetic operators that share an operand and whose
results are used in mutually exclusive cases controlled by a multiplexer, and
merges them together by multiplexing the other operands
 2019-07-26 11:36:48 +02:00
Clifford Wolf 2454ad99bf Refactor "opt_rmdff -sat" 
Signed-off-by: Clifford Wolf <clifford@clifford.at>
 2019-06-20 13:44:21 +02:00
Bogdan Vukobratovic 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
Keith Rothman 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
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
whitequark 4fd458290c opt_expr: refactor simplification of unsigned X<onehot and X>=onehot. NFCI. 2019-01-02 05:11:29 +00:00
whitequark 9e9846a6ea opt_expr: refactor simplification of signed X>=0 and X<0. NFCI. 2019-01-02 03:01:25 +00:00
whitequark 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
whitequark 42c356c49c opt_lut: eliminate LUTs evaluating to constants or inputs. 2018-12-31 23:55:40 +00:00
Clifford Wolf 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
whitequark 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
whitequark c38ea9ae65 equiv_opt: new command, for verifying optimization passes. 2018-12-07 17:20:34 +00:00
whitequark 7ec740b7ad opt_lut: leave intact LUTs with cascade feeding module outputs. 2018-12-07 17:13:52 +00:00
whitequark 45cb6200af opt_lut: add -dlogic, to avoid disturbing logic such as carry chains. 2018-12-05 16:30:37 +00:00
whitequark 9e072ec21f opt_lut: new pass, to combine LUTs for tighter packing. 2018-12-05 16:30:37 +00:00