yosys

Commit Graph

Author	SHA1	Message	Date
Robert O'Callahan	3a5742ffd2	Improve commutative hashing. The simple XOR `commutative_eat()` implementation produces a lot of collisions. https://www.preprints.org/manuscript/201710.0192/v1/download is a useful reference on this topic. Running the included `hashTest.cc` without the hashlib changes, I get 49,580,349 collisions. The 49,995,000 (i,j) pairs (0 <= i < 10000, i < j < 10000) hash into only 414,651 unique hash values. We get simple collisions like (0,1) colliding with (2,3). With the hashlib changes, we get only 707,099 collisions and 49,287,901 unique hash values. Much better! The `commutative_hash` implementation corresponds to `Sum(4)` in the paper mentioned above.	2025-08-19 21:45:52 +00:00
Robert O'Callahan	e906ea3f1b	Add tests for dynamic precision and with with an int parameter	2025-08-15 23:58:58 +00:00
Robert O'Callahan	ffd52a0d8e	Making `stringf()` use the format conversion specs as-is without widening them. And make sure our fast-path for `%d` and `%u` narrows to `int` correctly. Resolves #5260	2025-07-31 10:54:56 +00:00
Jannis Harder	7cd822b7f5	rtlil: Add {from,to}_hdl_index methods to Wire In the past we had the occasional bug due to some place not handling all 4 combinations of upto/downto and zero/nonzero start_offset correctly.	2025-02-18 17:08:45 +01:00
Emil J. Tywoniak	785bd44da7	rtlil: represent Const strings as std::string	2024-10-14 06:28:12 +02:00
rodrigosiqueira	e0152319f5	Added required structure to implement unit tests Added modifications inside the main Makefile to refers the unit test Makefile. Added separated Makefile only for compiling unit tests. Added simple example of unit test. Signed-off-by: Charles Oliveira <18oliveira.charles@gmail.com> Signed-off-by: Pablo Alejandro <pabloabur@usp.br> Signed-off-by: Rodrigo Siqueira <siqueira@ime.usp.br>	2016-12-04 11:34:27 -02:00

6 Commits