Auxiliary libraries¶
The Yosys source distribution contains some auxiliary libraries that are bundled with Yosys.
SHA1¶
The files in libs/sha1/
provide a public domain SHA1 implementation written
by Steve Reid, Bruce Guenter, and Volker Grabsch. It is used for generating
unique names when specializing parameterized modules.
BigInt¶
The files in libs/bigint/
provide a library for performing arithmetic with
arbitrary length integers. It is written by Matt McCutchen.
The BigInt library is used for evaluating constant expressions, e.g. using the ConstEval class provided in kernel/consteval.h.
See also: http://mattmccutchen.net/bigint/
SubCircuit¶
The files in libs/subcircuit
provide a library for solving the subcircuit
isomorphism problem. It is written by C. Wolf and based on the Ullmann Subgraph
Isomorphism Algorithm [Ull76]. It is used by the
extract pass (see extract - find subcircuits and replace them with cells).
ezSAT¶
The files in libs/ezsat
provide a library for simplifying generating CNF
formulas for SAT solvers. It also contains bindings of MiniSAT. The ezSAT
library is written by C. Wolf. It is used by the sat pass (see
sat - solve a SAT problem in the circuit).