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Generalize muxadd to muxorder

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This commit is contained in:
Akash Levy 2025-03-06 16:57:47 -08:00
parent 2749b6f31b
commit fa97c4830e
5 changed files with 171 additions and 154 deletions
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16
passes/opt/peepopt.cc
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@ -68,9 +68,11 @@ struct PeepoptPass : public Pass {
log(" based pattern to prevent combinational paths from the\n");
log(" output to the enable input after running clk2fflogic.\n");
log("\n");
log("If -withmuxadd is specified it adds the following rule:\n");
log("If -muxorder is specified it adds the following rule:\n");
log("\n");
log(" * muxadd - Replace S?(A+B):A with A+(S?B:0)\n");
log(" * muxorder - Replace S?(A OP B):A with A OP (S?B:I) where I is identity of OP\n");
log(" Ex 1: S?(A + B):A ---> A + (S?B:0)\n");
log(" Ex 2: S?(A * B):A ---> A & (S?B:1)\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -78,7 +80,7 @@ struct PeepoptPass : public Pass {
log_header(design, "Executing PEEPOPT pass (run peephole optimizers).\n");
bool formalclk = false;
bool withmuxadd = false;
bool muxorder = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
@ -86,8 +88,8 @@ struct PeepoptPass : public Pass {
formalclk = true;
continue;
}
if (args[argidx] == "-withmuxadd") {
withmuxadd = true;
if (args[argidx] == "-muxorder") {
muxorder = true;
continue;
}
break;
@ -119,8 +121,8 @@ struct PeepoptPass : public Pass {
pm.run_shiftmul_left();
pm.run_muldiv();
pm.run_muldiv_c();
if (withmuxadd)
pm.run_muxadd();
if (muxorder)
pm.run_muxorder();
}
}
}