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84 Commits

Author SHA1 Message Date
whitequark 4a942ba7b9 proc_clean: fix order of switch insertion. 
Fixes #1268.
 2019-08-19 16:44:23 +00:00
Clifford Wolf f54bf1631f
Merge pull request #1258 from YosysHQ/eddie/cleanup 
Cleanup a few barnacles across codebase
 2019-08-10 09:52:14 +02:00
whitequark 0b09a347dc proc_prune: fix handling of exactly identical assigns. 
Before this commit, in a process like:
   process $proc$bug.v:8$3
     assign $foo \bar
     switch \sel
       case 1'1
         assign $foo 1'1
         assign $foo 1'1
       case
         assign $foo 1'0
     end
   end
both of the "assign $foo 1'1" would incorrectly be removed.

Fixes #1243.
 2019-08-08 05:32:35 +00:00
Eddie Hung 3486235338 Make liberal use of IdString.in() 2019-08-06 16:18:18 -07:00
Jean-François Nguyen 320bf2fde5 proc_prune: Promote partially redundant assignments. 2019-08-01 13:09:55 +02:00
Clifford Wolf e95ce1f7af
Merge pull request #1168 from whitequark/bugpoint-processes 
Add support for processes in bugpoint
 2019-07-09 16:59:43 +02:00
Clifford Wolf a0787c12f0
Merge pull request #1169 from whitequark/more-proc-cleanups 
A new proc_prune pass
 2019-07-09 16:59:18 +02:00
whitequark 44bcb7a187 proc_prune: promote assigns to module connections when legal. 
This can pave the way for further transformations by exposing
identities that were previously hidden in a process to any pass that
uses SigMap. Indeed, this commit removes some ad-hoc logic from
proc_init that appears to have been tailored to the output of
genrtlil in favor of using `SigMap.apply()`. (This removal is not
optional, as the ad-hoc logic cannot cope with the result of running
proc_prune; a similar issue was fixed in proc_arst.)
 2019-07-09 09:30:58 +00:00
whitequark 5fe0ffe30f proc_prune: new pass. 
The proc_prune pass is similar in nature to proc_rmdead pass: while
proc_rmdead removes branches that never become active because another
branch preempts it, proc_prune removes assignments that never become
active because another assignment preempts them.

Genrtlil contains logic similar to the proc_prune pass, but their
purpose is different: genrtlil has to prune assignments to adapt
the semantics of blocking assignments in HDLs (latest assignment
wins) to semantics of assignments in RTLIL processes (assignment in
the most specific case wins). On the other hand proc_prune is
a general purpose RTLIL simplification that benefits all frontends,
even those not using the Yosys AST library.

The proc_prune pass is added to the proc script after proc_rmdead,
since it gives better results with fewer branches.
 2019-07-09 09:30:58 +00:00
whitequark f7a14a5678 proc_clean: add -quiet option. 
This is useful for other passes that call it often, like bugpoint.
 2019-07-09 09:27:43 +00:00
whitequark 48655dfb8b proc_mux: consider \src attribute on CaseRule. 2019-07-08 13:18:18 +00:00
Clifford Wolf 88be1cbfa5 Improve proc full_case detection and handling, fixes #931 
Signed-off-by: Clifford Wolf <clifford@clifford.at>
 2019-04-18 15:13:47 +02:00
Eddie Hung 4da4a6da2f Revert #895 2019-04-16 11:07:51 -07:00
Eddie Hung b3378745fd
Revert "Recognise default entry in case even if all cases covered (fix for #931)" 2019-04-15 17:52:45 -07:00
Eddie Hung adc6efb584 Recognise default entry in case even if all cases covered (#931) 2019-04-11 12:34:51 -07:00
Sylvain Munaut 39380c45ba proc_mux: Fix crash when trying to optimize non-existant mux to shiftx 
last_mux_cell can be NULL ...

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
 2019-04-03 14:50:12 +02:00
Eddie Hung b7a3d35c6b Create one $shiftx per bit in width 2019-03-25 11:16:56 -07:00
Eddie Hung 2507d01b03 Add a pmux-to-shiftx optimisation to proc_mux 2019-03-23 16:45:36 -07:00
whitequark 58d059ccb7 proc_clean: fix critical typo. 2019-01-23 22:08:38 +00:00
whitequark 95b6c35882 proc_clean: fix fully def check to consider compare/signal length. 
Fixes #790.
 2019-01-18 23:22:19 +00:00
whitequark 18291c20d2 proc_clean: remove any empty cases if all cases use all-def compare. 2018-12-23 09:04:30 +00:00
whitequark b784440857 proc_clean: remove any empty cases at the end of the switch. 
Previously, only completely empty switches were removed.
 2018-12-22 09:04:46 +00:00
Henner Zeller 3aa4484a3c Consistent use of 'override' for virtual methods in derived classes. 
o Not all derived methods were marked 'override', but it is a great
  feature of C++11 that we should make use of.
o While at it: touched header files got a -*- c++ -*- for emacs to
  provide support for that language.
o use YS_OVERRIDE for all override keywords (though we should probably
  use the plain keyword going forward now that C++11 is established)
 2018-07-20 23:51:06 -07:00
Clifford Wolf ca2adc30c9 Add warnings for driver-driver conflicts between FFs (and other cells) and constants 2017-12-12 17:13:27 +01:00
Clifford Wolf f9d023c53f Add src attribute to extra cells generated by proc_dlatch 2017-09-09 10:18:08 +02:00
Clifford Wolf 53655d173b Added $global_clock verilog syntax support for creating $ff cells 2016-10-14 12:33:56 +02:00
Clifford Wolf 2032e6d8e4 Added "proc_mux -ifx" 2016-06-06 17:15:50 +02:00
Clifford Wolf d2695e2bfa Fix all undef-muxes in dlatch input cone 2016-06-02 14:37:07 +02:00
Clifford Wolf adfc80727c Avoid creating undef-muxes when inferring latches in proc_dlatch 2016-06-01 13:25:06 +02:00
Clifford Wolf 93e107e455 Fixed proc_mux performance bug 2016-04-25 10:43:04 +02:00
Clifford Wolf b1d6f05fa2 Fixed performance bug in proc_dlatch 2016-04-24 19:29:56 +02:00
Clifford Wolf 965b0d59b5 More flexible handling of initialization values 2016-04-22 12:13:06 +02:00
Clifford Wolf 0bc95f1e04 Added "yosys -D" feature 2016-04-21 23:28:37 +02:00
Clifford Wolf e5dd5c0bcc Preserve empty $pmux default cases 2016-03-31 09:57:23 +02:00
Clifford Wolf 1ea6db3db8 Improved proc_mux performance for huge always blocks 2015-12-02 22:02:20 +01:00
Clifford Wolf 0350074819 Re-created command-reference-manual.tex, copied some doc fixes to online help 2015-08-14 11:27:19 +02:00
Clifford Wolf 6c84341f22 Fixed trailing whitespaces 2015-07-02 11:14:30 +02:00
Clifford Wolf d176e613c2 Minor fixes in handling of "init" attribute 2015-04-09 15:12:26 +02:00
Clifford Wolf 81fa4e81a6 Fixed compilation problems with gcc 4.6.3; use enum instead of const ints. 
(original patch by Andrew Becker <andrew.becker@epfl.ch>)
 2015-02-24 11:01:00 +01:00
Clifford Wolf 554a8df5e2 Added "proc_dlatch" 2015-02-12 16:56:01 +01:00
Clifford Wolf e62d838bd4 Removed SigSpec::extend_xx() api 2015-01-01 11:41:52 +01:00
Clifford Wolf edb3c9d0c4 Renamed extend() to extend_xx(), changed most users to extend_u0() 2014-12-24 09:51:17 +01:00
Clifford Wolf fe829bdbdc Added log_warning() API 2014-11-09 10:44:23 +01:00
Clifford Wolf 4569a747f8 Renamed SIZE() to GetSize() because of name collision on Win32 2014-10-10 17:07:24 +02:00
Clifford Wolf f9a307a50b namespace Yosys 2014-09-27 16:17:53 +02:00
Clifford Wolf 9d353fc543 Fixed handling of constant-true branches in proc_clean 2014-08-12 17:35:22 +02:00
Clifford Wolf b9bd22b8c8 More cleanups related to RTLIL::IdString usage 2014-08-02 13:19:57 +02:00
Clifford Wolf cdae8abe16 Renamed port access function on RTLIL::Cell, added param access functions 2014-07-31 16:38:54 +02:00
Clifford Wolf 1cb25c05b3 Moved some stuff to kernel/yosys.{h,cc}, using Yosys:: namespace 2014-07-31 13:19:47 +02:00
Clifford Wolf 7bd2d1064f Using log_assert() instead of assert() 2014-07-28 11:27:48 +02:00