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peepopt: Describe rules in help message

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This commit is contained in:
Martin Povišer 2023-10-16 14:08:42 +02:00
parent 5c0c8251c3
commit 660be4a31e
1 changed files with 11 additions and 0 deletions
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11
passes/pmgen/peepopt.cc
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@ -37,6 +37,17 @@ struct PeepoptPass : public Pass {
log("\n"); log("\n");
log("This pass applies a collection of peephole optimizers to the current design.\n"); log("This pass applies a collection of peephole optimizers to the current design.\n");
log("\n"); log("\n");
log("This pass employs the following rules:\n");
log("\n");
log(" * muldiv - Replace (A*B)/B with A\n");
log("\n");
log(" * shiftmul - Replace A>>(B*C) with A'>>(B<<K) where C and K are constants\n");
log(" and A' is derived from A by appropriately inserting padding\n");
log(" into the signal. (right variant)\n");
log("\n");
log(" Analogously, replace A<<(B*C) with appropriate selection of\n");
log(" output bits from A<<(B<<K). (left variant)\n");
log("\n");
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) override void execute(std::vector<std::string> args, RTLIL::Design *design) override
{ {