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tondapusili 643427d9c9 Add negopt pass with comprehensive pattern matching 
This commit introduces the negopt pass with pre/post optimization modes
for handling negation patterns in arithmetic circuits.

Pre-optimization patterns (expose for tree balancing):
- manual2sub: (a + ~b) + 1 → a - b
- sub2neg: a - b → a + (-b)
- negexpand: -(a + b) → (-a) + (-b) [with output width fix]
- negneg: -(-a) → a
- negmux: -(s ? a : b) → s ? (-a) : (-b)

Post-optimization patterns (cleanup/rebuild):
- negrebuild: (-a) + (-b) → -(a + b)
- muxneg: s ? (-a) : (-b) → -(s ? a : b)
- neg2sub: a + (-b) → a - b

All patterns use nusers() for fanout checking (standard Yosys style).
Comprehensive test coverage with positive/negative cases and formal
verification via equiv_opt.
 		2026-02-03 17:21:21 -08:00
..
aiger Merge pull request #5526 from YosysHQ/emil/fix-cellaigs-function-arg-eval-order 2025-12-12 10:00:09 +01:00
alumacc Limit YOSYS_MAX_THREADS to 4 for abcopt-tests 2025-12-04 12:09:49 +01:00
arch Bump Yosys to latest 2025-12-17 21:06:17 -08:00
asicworld Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
bind Add a general tests/.gitignore and remove redundant entries in subdirectory .gitignore files. 2025-07-22 10:38:38 +00:00
blif Merge from upstream 2026-01-26 22:16:11 -08:00
bram Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
bugpoint raise_error: don't rely on module ordering in test 2025-09-16 15:47:16 +02:00
cxxrtl Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
errors Rename the generic "Syntax error" message from the Verilog/SystemVerilog parser into unique, 2018-10-25 02:37:56 +03:00
fmt Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
fsm Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
functional Add test 2026-01-06 16:19:04 -08:00
hana Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
liberty Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
lut Add a general tests/.gitignore and remove redundant entries in subdirectory .gitignore files. 2025-07-22 10:38:38 +00:00
memfile Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
memlib Bump Yosys to latest 2025-12-17 21:06:17 -08:00
memories Limit YOSYS_MAX_THREADS to 4 for abcopt-tests 2025-12-04 12:09:49 +01:00
opt Merge from upstream 2026-01-26 22:16:11 -08:00
opt_share Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
peepopt Bump Yosys to latest 2025-12-17 21:06:17 -08:00
proc Test empty switches 2026-01-07 13:21:33 +13:00
pyosys pyosys: __getitem__ for supported classes 2025-11-19 18:09:41 +02:00
realmath tests: use /usr/bin/env for bash. 2023-08-12 11:59:39 +10:00
rpc Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
rtlil Add CONST_FLAG_UNSIZED 2025-11-07 17:45:07 +13:00
sat fix(parse): #5234 adjust width of rhs according to lhs 2025-09-16 15:24:23 +02:00
sdc sdc: error on unknown getters 2025-11-19 15:26:02 +01:00
select Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
share Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
silimate Add negopt pass with comprehensive pattern matching 2026-02-03 17:21:21 -08:00
sim Revert sim's cycle_width default back to 10, but keep -width option 2025-10-20 14:40:05 +02:00
simple Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
simple_abc9 Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
smv Remove references to ilang 2024-11-05 12:36:31 +13:00
sva tests/sva: Skip sva tests that use SBY until SBY is compatible again 2024-03-05 14:37:33 +01:00
svinterfaces Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
svtypes Merge upstream in 2025-09-09 05:50:48 -07:00
techmap Remove annoying test case 2026-01-28 19:18:06 -08:00
tools Add AFL++ Grammar-Generator grammar for RTLIL fuzzing, and instructions for how to use it. 2025-12-22 21:56:26 +00:00
unit Merge from upstream 2026-01-28 18:17:50 -08:00
various Merge remote-tracking branch 'upstream/main' 2026-01-21 15:13:57 -08:00
verific Merge from upstream 2026-01-29 17:46:44 -08:00
verilog Merge pull request #4235 from ylm/genblk_wire 2026-01-13 16:40:22 +01:00
vloghtb tests: use /usr/bin/env for bash. 2023-08-12 11:59:39 +10:00
xprop Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
.gitignore Add a general tests/.gitignore and remove redundant entries in subdirectory .gitignore files. 2025-07-22 10:38:38 +00:00
common-env.sh Limit YOSYS_MAX_THREADS to 4 when running seed-tests 2025-12-04 12:09:48 +01:00
gen-tests-makefile.sh Limit YOSYS_MAX_THREADS to 4 when running makefile-tests so we don't overload systems when running 'make -j... test' 2025-12-04 12:09:04 +01:00
pass-fuzzing.md Add AFL++ Grammar-Generator grammar for RTLIL fuzzing, and instructions for how to use it. 2025-12-22 21:56:26 +00:00