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Code Activity
3145 commits 93 branches 52 tags 62 MiB
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229 commits

Author SHA1 Message Date
C-Elegans a94c3694d7 Refactor and generalize the comparision optimization 
Generalizes the optimization to:
a < C,
a >= C,
C > a,
C <= a
 2017-01-30 17:52:16 -05:00
C-Elegans 2fa0fd4a37 Do not use b.as_int() in calculation of bit set 2017-01-21 12:58:26 -05:00
C-Elegans 84f9cd0025 Optimize compares to powers of 2 
Remove opt_compare and put comparison pass in opt_expr

assuming a [7:0] is unsigned
a >= (1<<x) becomes |a[7:x]
a <  (1<<x) becomes !a[7:x]

Additionally:
a >= 0 becomes constant true,
a < 0 becomes constant false

delete opt_compare.cc
revert opt.cc to commit b7cfb7dbd (remove opt_compare step)
 2017-01-16 13:45:50 -05:00
C-Elegans 943389cdd5 Fix issue #269, optimize signed compare with 0 
add opt_compare pass and add it to opt
for a < 0:
    if a is signed, replace with a[max_bit-1]
for a >= 0:
    if a is signed, replace with ~a[max_bit-1]
 2017-01-15 13:38:29 -05:00
Clifford Wolf 2ef454c3f5 Added opt_rmdff support for $ff cells 2016-10-14 13:02:36 +02:00
Clifford Wolf ed519f578e Added "opt_rmdff -keepdc" 2016-09-30 17:02:38 +02:00
Clifford Wolf 4ea7054b56 Improved init spec handling in opt_rmdff, modernized the code a bit 2016-08-30 01:34:04 +02:00
Clifford Wolf eae390ae17 Removed $predict again 2016-08-28 21:35:33 +02:00
Clifford Wolf d77a914683 Added "wreduce -memx" 2016-08-20 12:52:50 +02:00
Clifford Wolf f6629b9c29 Optimize memory address port width in wreduce and memory_collect, not verilog front-end 2016-08-19 18:38:25 +02:00
Clifford Wolf d7763634b6 After reading the SV spec, using non-standard predict() instead of expect() 2016-07-21 13:34:33 +02:00
Clifford Wolf 721f1f5ecf Added basic support for $expect cells 2016-07-13 16:56:17 +02:00
Clifford Wolf 11f7b8a2a1 Added opt_expr support for div/mod by power-of-two 2016-05-29 12:17:36 +02:00
Clifford Wolf 0d2923cccd Connections between inputs and inouts are driven by the input 2016-04-26 19:49:05 +02:00
Clifford Wolf 0bc95f1e04 Added "yosys -D" feature 2016-04-21 23:28:37 +02:00
Clifford Wolf 1565d1af69 Fixed performance bug in "share" pass 2016-04-21 19:47:25 +02:00
Clifford Wolf f38ca3e18f Improvements in opt_expr 2016-04-21 14:23:04 +02:00
Clifford Wolf 6cafd08ac1 Improved opt_merge support for $pmux cells 2016-03-31 09:58:55 +02:00
Clifford Wolf e2f6d61c00 Typo fixes in opt_expr and opt_merge 2016-03-31 09:56:56 +02:00
Clifford Wolf ec93680bd5 Renamed opt_share to opt_merge 2016-03-31 08:52:49 +02:00
Clifford Wolf 1d0f0d668a Renamed opt_const to opt_expr 2016-03-31 08:46:56 +02:00
Andrew Zonenberg dd7204c0bd Fixed typo in log message 2016-03-30 20:30:03 -07:00
Clifford Wolf d6592d5b99 Use alphanumerical order instead of idstring idx in opt_clean compare_signals() 2016-02-02 09:16:18 +01:00
Clifford Wolf ccdbf41be6 Improvements in wreduce 2015-10-31 13:39:30 +01:00
Clifford Wolf 207736b4ee Import more std:: stuff into Yosys namespace 2015-10-25 19:30:49 +01:00
Clifford Wolf 2a0f577f83 Fixed handling of driver-driver conflicts in wreduce 2015-10-24 13:44:35 +02:00
Clifford Wolf 1d83854d84 Bugfixes in handling of "keep" attribute on wires 2015-10-15 14:57:28 +02:00
Clifford Wolf 82028c42e0 Added wreduce $mul support and fixed signed $mul opt_const bug 2015-09-25 17:27:06 +02:00
Clifford Wolf 51e1295d79 Added detection of "mux inverter" chains in opt_const 2015-09-18 11:55:31 +02:00
Clifford Wolf e7c018e5d1 Fixed sharing of $memrd cells 2015-09-12 16:01:20 +02:00
Clifford Wolf b10ea0550d gcc-4.6 build fixes 2015-09-01 12:51:23 +02:00
Clifford Wolf f43815054e Properly clean up unused "init" attributes 2015-08-18 13:50:15 +02:00
Clifford Wolf ae09c89f62 Fixed opt_clean handling of inout ports 2015-08-16 09:50:17 +02:00
Clifford Wolf 84bf862f7c Spell check (by Larry Doolittle) 2015-08-14 10:56:05 +02:00
Clifford Wolf c43f38c81b Improved handling of "keep" attributes in hierarchical designs in opt_clean 2015-08-12 14:10:14 +02:00
Clifford Wolf 667b015018 Merge pull request #70 from gaomy3832/bugfix 
Remove unused blackbox modules in opt_clean.
 2015-08-12 08:45:04 +02:00
Mingyu Gao cbda56d178 Remove unused blackbox modules in opt_clean. 2015-08-11 09:51:08 -07:00
Mingyu Gao 8c4c62f3e1 Bugfix for cell hash cache option in opt_share. 2015-08-11 11:40:23 +02:00
Clifford Wolf 2185125760 Added missing ct_all setup to opt_clean 2015-08-11 07:54:32 +02:00
Mingyu Gao 021b4a2436 Bugfix for cell hash cache option in opt_share. 2015-08-10 13:01:44 -07:00
Clifford Wolf 2a613b1b66 Some cleanups in opt_rmdff 2015-07-25 12:09:57 +02:00
Clifford Wolf 914ae3401e Improved $adff simplification 2015-07-24 14:12:50 +02:00
Clifford Wolf 6c84341f22 Fixed trailing whitespaces 2015-07-02 11:14:30 +02:00
Clifford Wolf 053058d781 Added opt_const -clkinv 2015-07-01 10:49:21 +02:00
Clifford Wolf 08f9b38a9c Added opt_share -share_all 2015-05-31 14:24:34 +02:00
Clifford Wolf 4b6221478e Added simple $dlatch support to opt_rmdff 2015-05-23 09:45:48 +02:00
Clifford Wolf e122c2644e preserve used $-wires with init attribute in opt_clean 2015-05-22 08:20:29 +02:00
Clifford Wolf f483dce7c2 Added $eq/$neq -> $logic_not/$reduce_bool optimization 2015-04-29 07:28:15 +02:00
Clifford Wolf 9041f34233 Improved handling of init values in opt_rmdff 
based on a patch by Mingyu Gao, user gaomy3832 on github
 2015-04-18 08:04:31 +02:00
Clifford Wolf e305d85807 Added handling of bool-output cells to "wreduce" 2015-04-13 19:27:49 +02:00