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gowin: dsp: Add basic DSP block inferencing for various MULT cells

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Priit Laes 2025-10-02 23:13:08 +03:00
parent a80462f27f
commit 5ad9e4cacc
5 changed files with 204 additions and 1 deletions
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45
techlibs/gowin/synth_gowin.cc
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@ -91,13 +91,16 @@ struct SynthGowinPass : public ScriptPass
log(" The following families are supported:\n");
log(" 'gw1n', 'gw2a', 'gw5a'.\n");
log("\n");
log(" -nodsp\n");
log(" do not infer DSP multipliers.\n");
log("\n");
log("The following commands are executed by this synthesis command:\n");
help_script();
log("\n");
}
string top_opt, vout_file, json_file, family;
bool retime, nobram, nolutram, flatten, nodffe, nowidelut, abc9, noiopads, noalu, no_rw_check;
bool retime, nobram, nolutram, flatten, nodffe, nowidelut, abc9, noiopads, noalu, no_rw_check, nodsp;
void clear_flags() override
{
@ -115,6 +118,7 @@ struct SynthGowinPass : public ScriptPass
noiopads = false;
noalu = false;
no_rw_check = false;
nodsp = false;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -193,6 +197,10 @@ struct SynthGowinPass : public ScriptPass
no_rw_check = true;
continue;
}
if (args[argidx] == "-nodsp") {
nodsp = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -208,6 +216,24 @@ struct SynthGowinPass : public ScriptPass
log_pop();
}
// DSP mapping rules for mul2dsp
struct DSPRule {
int a_maxwidth;
int b_maxwidth;
int a_minwidth;
int b_minwidth;
std::string prim;
};
// gw1n and gw2a
const std::vector<DSPRule> dsp_rules = {
{36, 36, 18, 18, "$__MUL36X36"},
{18, 18, 10, 4, "$__MUL18X18"},
{18, 18, 4, 10, "$__MUL18X18"},
{ 9, 9, 4, 4, "$__MUL9X9"},
};
// TODO: gw5a (MULT12X12, MULT27x36)
void script() override
{
std::string no_rw_check_opt = "";
@ -233,6 +259,23 @@ struct SynthGowinPass : public ScriptPass
if (check_label("coarse"))
{
if (help_mode)
{
run("techmap -map +/mul2dsp.v [...]", "(unless -nodsp)");
run("techmap -map +/gowin/dsp_map.v [...]", "(unless -nodsp)");
} else if (!nodsp) {
if (family == "gw1n" || family == "gw2a")
{
for (const auto &rule : dsp_rules)
{
run(stringf("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=%d -D DSP_B_MAXWIDTH=%d -D DSP_A_MINWIDTH=%d -D DSP_B_MINWIDTH=%d -D DSP_NAME=%s",
rule.a_maxwidth, rule.b_maxwidth, rule.a_minwidth, rule.b_minwidth, rule.prim.c_str()));
run("chtype -set $mul t:$__soft_mul");
}
run("techmap -map +/gowin/dsp_map.v");
}
}
run("synth -run coarse" + no_rw_check_opt);
}