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YosysHQ.yosys/tests/opt
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Natalia Kokoromyti 8b6925c5b0 Add opt_balance_tree pass for timing optimization 
This pass converts cascaded chains of arithmetic and logic cells ($add,
$mul, $and, $or, $xor) into balanced binary trees to improve timing
performance in hardware synthesis.

The optimization uses a breadth-first search approach to identify chains
of compatible cells, then recursively constructs balanced trees that
reduce the critical path depth.

Features:
- Supports arithmetic cells: $add, $mul
- Supports logic cells: $and, $or, $xor
- Command-line options: -arith (arithmetic only), -logic (logic only)
- Preserves signed/unsigned semantics
- Comprehensive test suite with 30 test cases

Original implementation by Akash Levy <akash@silimate.com> for Silimate.
Upstreamed from https://github.com/Silimate/yosys
2026-01-13 14:20:11 -08:00
..
alumacc.ys
alumacc: add signed-independent comparison tests
2023-10-09 00:36:22 +08:00
bug1525.ys
opt_share: Fix handling of fine cells.
2019-11-27 08:01:07 +01:00
bug1758.ys
tests: add opt_expr tests
2020-04-23 15:58:36 -07:00
bug1854.ys
Add new helper class for merging FFs into cells, use for memory_dff.
2021-05-23 14:46:59 +02:00
bug2010.ys
Add testcase for #2010
2020-05-01 14:07:33 -07:00
bug2221.ys
opt_expr: Fix crash on $mul optimization with more zeros removed than Y has.
2020-07-05 06:31:58 +02:00
bug2311.ys
opt_expr: Fix handling of $_XNOR_ cells with A = B.
2020-07-29 12:41:43 +02:00
bug2318.ys
peepopt.muldiv: Add a signedness check.
2020-08-04 16:30:24 +02:00
bug2623.ys
rtlil: Disallow 0-width chunks in SigSpec.
2021-03-15 17:16:24 +01:00
bug2765.ys
proc_memwr: Use the v2 memwr cell.
2021-08-11 13:34:10 +02:00
bug2766.ys
opt_mem_feedback: Rewrite feedback path finding logic.
2021-05-24 23:20:30 +02:00
bug2824.ys
Add regression test for #2824.
2021-06-11 12:06:35 +01:00
bug2920.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
bug3047.ys
extract_reduce: Refactor and fix input signal construction.
2021-10-21 04:10:01 +02:00
bug3117.ys
memory_share: Fix SAT-based sharing for wide ports.
2021-12-20 18:40:14 +01:00
bug3848.ys
opt_share: Fix input confusion with ANDNOT, ORNOT gates
2023-07-20 20:58:52 +01:00
bug3867.ys
opt_expr: Fix 'signed X>=0' replacement for wide output ports
2023-08-01 13:50:12 +01:00
bug4413.ys
peepopt: avoid shift-amount underflow
2024-06-13 23:30:07 +02:00
bug4610.ys
tests: replace read_ilang with read_rtlil
2024-11-20 14:54:23 +01:00
bug5164.ys
tests: add test for #5164 opt_dff -sat UAF
2025-06-06 23:46:23 +01:00
bug5398.ys
opt_hier: Fix two optimizations conflicting
2025-09-29 12:27:27 +02:00
memory_bmux2rom.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
memory_dff_trans.ys
memory_share: Add -nosat and -nowiden options.
2021-08-14 00:09:04 +02:00
memory_map_offset.ys
memory_map: Improve start_offset handling.
2021-05-31 17:45:21 +02:00
opt_balance_tree.ys
Add opt_balance_tree pass for timing optimization
2026-01-13 14:20:11 -08:00
opt_clean_init.ys
opt_clean: Remove init attribute bits together with removed DFFs.
2021-03-15 17:16:53 +01:00
opt_clean_mem.ys
proc_memwr: Use the v2 memwr cell.
2021-08-11 13:34:10 +02:00
opt_dff_arst.ys
Add opt_dff pass.
2020-07-30 18:27:04 +02:00
opt_dff_clk.ys
Add opt_dff pass.
2020-07-30 18:27:04 +02:00
opt_dff_const.ys
Add opt_dff pass.
2020-07-30 18:27:04 +02:00
opt_dff_dffmux.ys
peepopt: Remove now-redundant dffmux pattern.
2020-08-07 13:21:34 +02:00
opt_dff_en.ys
Fix tests for check in equiv_opt
2022-10-07 16:04:51 +02:00
opt_dff_mux.ys
Fix tests for check in equiv_opt
2022-10-07 16:04:51 +02:00
opt_dff_qd.ys
tests: Remove part of test involving combinational loops
2024-03-11 10:45:36 +01:00
opt_dff_sr.ys
Re-enable opt_dff_sr equiv_opt checks
2022-10-07 16:04:51 +02:00
opt_dff_srst.ys
Add opt_dff pass.
2020-07-30 18:27:04 +02:00
opt_dff-simplify.il
opt_dff: add test
2025-08-14 00:13:23 +03:00
opt_dff-simplify.ys
opt_dff: more explicit testing, typo
2025-08-27 11:29:57 +02:00
opt_expr_alu.ys
test: update opt_expr_alu test
2020-05-08 11:12:58 -07:00
opt_expr_and.ys
tests: add opt_expr tests
2020-04-23 15:58:36 -07:00
opt_expr_cmp.v
opt_expr: improve simplification of comparisons with large constants.
2019-01-02 15:45:28 +00:00
opt_expr_cmp.ys
opt_expr: simplify any unsigned comparisons with all-0 and all-1.
2019-01-02 02:45:49 +00:00
opt_expr_combined_assign.ys
opt_expr: avoid multiple drivers issue #4792 in combined assign tests
2025-12-19 18:32:56 +01:00
opt_expr_constconn.v
opt_expr: Propagate constants to port connections.
2021-07-27 20:44:26 +02:00
opt_expr_constconn.ys
opt_expr: Propagate constants to port connections.
2021-07-27 20:44:26 +02:00
opt_expr_consumex.ys
tests: opt_expr tests that depend on consumex
2020-05-08 11:07:11 -07:00
opt_expr_more.ys
opt_expr: expand test coverage
2025-03-31 19:31:53 +02:00
opt_expr_mux_undef.ys
opt_expr: Fix #4590
2025-04-04 12:25:31 +13:00
opt_expr_or.ys
tests: add opt_expr tests
2020-04-23 15:58:36 -07:00
opt_expr_shift.ys
tests: test opt_expr for 32 bit unsigned shifts
2025-05-26 15:28:44 +01:00
opt_expr_shr_int_max.ys
Add test for shifting by INT_MAX
2025-02-14 14:01:27 +13:00
opt_expr_xnor.ys
simplemap: Map $xnor to $_XNOR_ cells
2022-11-29 19:06:45 +01:00
opt_expr_xor.ys
simplemap: Map $xnor to $_XNOR_ cells
2022-11-29 19:06:45 +01:00
opt_expr.ys
opt_expr: Optimize multiplications with low 0 bits in operands.
2020-04-13 16:52:22 +02:00
opt_hier_simple1.v
Start opt_hier
2025-07-05 16:45:52 +02:00
opt_hier_simple2.v
Start opt_hier
2025-07-05 16:45:52 +02:00
opt_hier_test1.v
Start opt_hier
2025-07-05 16:45:52 +02:00
opt_hier.tcl
Start opt_hier
2025-07-05 16:45:52 +02:00
opt_lut_elim.il
opt_lut: eliminate LUTs evaluating to constants or inputs.
2018-12-31 23:55:40 +00:00
opt_lut_elim.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
opt_lut_ins.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
opt_lut_port.il
opt_lut: leave intact LUTs with cascade feeding module outputs.
2018-12-07 17:13:52 +00:00
opt_lut_port.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
opt_lut.v
…
opt_lut.ys
Revert "Merge pull request #1280 from YosysHQ/revert-1266-eddie/ice40_full_adder"
2019-08-12 12:06:45 -07:00
opt_mem_feedback.ys
Add v2 memory cells.
2021-08-11 13:34:10 +02:00
opt_mem_priority.ys
memory_share: Add -nosat and -nowiden options.
2021-08-14 00:09:04 +02:00
opt_merge_basic.ys
opt_merge: test more kinds of cells
2025-03-10 13:14:06 +01:00
opt_merge_init.ys
opt_merge: Add -keepdc option required for formal verification
2022-04-01 21:03:20 +02:00
opt_merge_keep.ys
opt_merge: speedup
2020-03-16 12:43:54 -07:00
opt_merge_properties.ys
avoid merging formal properties
2025-12-17 20:25:24 +01:00
opt_pow.ys
opt_expr: add test
2025-04-01 21:54:46 +03:00
opt_reduce_andor.ys
opt_reduce: add test for constant $reduce_and/or not being zero width
2024-09-25 16:28:41 +01:00
opt_reduce_bmux.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
opt_reduce_demux.ys
Remove references to ilang
2024-11-05 12:36:31 +13:00
opt_rmdff_sat.v
Revert "Merge pull request #1280 from YosysHQ/revert-1266-eddie/ice40_full_adder"
2019-08-12 12:06:45 -07:00
opt_rmdff_sat.ys
Add opt_dff pass.
2020-07-30 18:27:04 +02:00
opt_rmdff.v
Fix tests/opt/opt_rmdff
2020-06-09 22:48:26 +02:00
opt_rmdff.ys
Add opt_dff pass.
2020-07-30 18:27:04 +02:00
opt_share_add_sub.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_add_sub.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_bug2334.ys
opt_share: Refactor, fix some bugs.
2020-08-17 17:26:36 +02:00
opt_share_bug2335.ys
opt_share: Refactor, fix some bugs.
2020-08-17 17:26:36 +02:00
opt_share_bug2336.ys
opt_share: Refactor, fix some bugs.
2020-08-17 17:26:36 +02:00
opt_share_bug2538.ys
opt_share: Fix X and CO signal width for shifted $alu in opt_share.
2021-01-14 14:54:08 +01:00
opt_share_cat_multiuser.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_cat_multiuser.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_cat.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_cat.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_diff_port_widths.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_diff_port_widths.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_extend.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_extend.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_large_pmux_cat_multipart.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_large_pmux_cat_multipart.ys
Fix wrong results when opt_share called before opt_clean
2019-08-07 09:30:58 +02:00
opt_share_large_pmux_cat.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_large_pmux_cat.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_large_pmux_multipart.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_large_pmux_multipart.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_large_pmux_part.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_large_pmux_part.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
opt_share_mux_tree.v
Tabs to spaces in opt_share examples
2019-08-03 12:35:46 +02:00
opt_share_mux_tree.ys
Reimplement opt_share to work on $alu and $pmux
2019-07-28 16:03:54 +02:00
run-test.sh
Start opt_hier
2025-07-05 16:45:52 +02:00