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Add mul2dsp multiplier splitting rule and ECP5 mapping

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-07-08 15:40:12 +01:00
parent c35023d0bf
commit 269ff450f5
5 changed files with 280 additions and 2 deletions
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33
techlibs/ecp5/synth_ecp5.cc
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@ -89,6 +89,9 @@ struct SynthEcp5Pass : public ScriptPass
log(" generate an output netlist (and BLIF file) suitable for VPR\n");
log(" (this feature is experimental and incomplete)\n");
log("\n");
log(" -dsp\n");
log(" map multipliers to MULT18X18D (EXPERIMENTAL)\n");
log("\n");
log("\n");
log("The following commands are executed by this synthesis command:\n");
help_script();
@ -96,7 +99,7 @@ struct SynthEcp5Pass : public ScriptPass
}
string top_opt, blif_file, edif_file, json_file;
bool noccu2, nodffe, nobram, nodram, nowidelut, flatten, retime, abc2, abc9, vpr;
bool noccu2, nodffe, nobram, nodram, nowidelut, flatten, retime, abc2, abc9, dsp, vpr;
void clear_flags() YS_OVERRIDE
{
@ -114,6 +117,7 @@ struct SynthEcp5Pass : public ScriptPass
abc2 = false;
vpr = false;
abc9 = false;
dsp = false;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@ -192,6 +196,10 @@ struct SynthEcp5Pass : public ScriptPass
abc9 = true;
continue;
}
if (args[argidx] == "-dsp") {
dsp = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -225,7 +233,28 @@ struct SynthEcp5Pass : public ScriptPass
if (check_label("coarse"))
{
run("synth -run coarse");
run("opt_expr");
run("opt_clean");
run("check");
run("opt");
run("wreduce");
run("peepopt");
run("opt_clean");
run("share");
run("techmap -map +/cmp2lut.v -D LUT_WIDTH=4");
run("opt_expr");
run("opt_clean");
if (dsp) {
run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=18 -D DSP_B_MAXWIDTH=18 -D DSP_NAME=$__MUL18X18");
run("clean");
run("techmap -map +/ecp5/dsp_map.v");
}
run("alumacc");
run("opt");
run("fsm");
run("opt -fast");
run("memory -nomap");
run("opt_clean");
}
if (!nobram && check_label("bram", "(skip if -nobram)"))