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recover_reduce: Update documentation 

The documentation now describes the commands performed in the deleted
recover_reduce script.
This commit is contained in:
Robert Ou 2017-08-27 02:19:19 -07:00
parent 74d0f17fd4
commit 849b885775
1 changed files with 11 additions and 8 deletions
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19
passes/techmap/recover_reduce.cc
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@ -23,25 +23,28 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct RecoverReduceCorePass : public Pass {
struct RecoverReducePass : public Pass {
enum GateType {
And,
Or,
Xor
};
RecoverReduceCorePass() : Pass("recover_reduce_core", "converts gate chains into $reduce_*") { }
RecoverReducePass() : Pass("recover_reduce", "converts gate chains into $reduce_* cells") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" recover_reduce_core\n");
log(" recover_reduce\n");
log("\n");
log("converts gate chains into $reduce_*\n");
log("converts gate chains into $reduce_* cells\n");
log("\n");
log("This performs the core step of the recover_reduce command. This step recognizes\n");
log("chains of gates found by the previous steps and converts these chains into one\n");
log("logical cell.\n");
log("This command finds chains of $_AND_, $_OR_, and $_XOR_ cells and replaces them\n");
log("with their corresponding $reduce_* cells. Because this command only operates on\n");
log("these cell types, it is recommended to map the design to only these cell types\n");
log("using the `abc -g` command. Note that, in some cases, it may be more effective\n");
log("to map the design to only $_AND_ cells, run recover_reduce, map the remaining\n");
log("parts of the design to AND/OR/XOR cells, and run recover_reduce a second time.\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
@ -214,6 +217,6 @@ struct RecoverReduceCorePass : public Pass {
module->remove(cell);
}
}
} RecoverReduceCorePass;
} RecoverReducePass;
PRIVATE_NAMESPACE_END