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peepopt: Describe shiftadd rule in help message

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Philippe Sauter
2023-11-06 14:01:37 +01:00
committed by phsauter
parent 9ca57d9f13
commit b6df900bcc
1 changed files with 3 additions and 0 deletions
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passes/pmgen/peepopt.cc
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@@ -48,6 +48,9 @@ struct PeepoptPass : public Pass {
log(" Analogously, replace A<<(B*C) with appropriate selection of\n"); log(" Analogously, replace A<<(B*C) with appropriate selection of\n");
log(" output bits from A<<(B<<K). (left variant)\n"); log(" output bits from A<<(B<<K). (left variant)\n");
log("\n"); log("\n");
log(" * shiftadd - Replace A>>(B+D) with (A'>>D)>>(B) where D is constant and\n");
log(" A' is derived from A by padding or cutting inaccessible bits.\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
{ {