mirror of https://github.com/YosysHQ/yosys.git
d22a8d157d
If the annotations are not used, this commit does not alter semantics at all, other than removing elision of outputs of black box cells. (Elision of such outputs is expected to be too rare to have any noticeable benefit, and the implementation was somewhat of a hack.) The (* cxxrtl.comb *) annotation alters the semantics of the output of the black box it is applied to such that, if the black box converges immediately, no additional delta cycle is necessary to propagate the computed combinatorial value upwards in hierarchy. The (* cxxrtl.sync *) annotation alters the semantics of the output of the black box it is applied to such as to remove any uses of the black box by the wires connected to this output, and break false feedback arcs arising from conservative modeling of dependencies of the black box. Although currently these attributes are only recognized on black boxes, if separate compilation is added in the future, it could also emit and consume them. |
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| .. | ||
| aiger | ||
| blif | ||
| btor | ||
| cxxrtl | ||
| edif | ||
| firrtl | ||
| ilang | ||
| intersynth | ||
| json | ||
| protobuf | ||
| simplec | ||
| smt2 | ||
| smv | ||
| spice | ||
| table | ||
| verilog | ||