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Merge pull request #5670 from max-kudinov/gowin_mult

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Gowin: Add DSP inference for GW1N and GW2A
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Miodrag Milanović 2026-02-12 14:30:27 +01:00 • committed by GitHub
commit e4b32d6aae
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GPG key ID: B5690EEEBB952194
5 changed files with 233 additions and 10 deletions
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66
techlibs/gowin/synth_gowin.cc
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@ -29,6 +29,21 @@ struct SynthGowinPass : public ScriptPass
{
SynthGowinPass() : ScriptPass("synth_gowin", "synthesis for Gowin FPGAs") { }
struct DSPRule {
int a_maxwidth;
int b_maxwidth;
int a_minwidth;
int b_minwidth;
std::string prim;
};
const std::vector<DSPRule> dsp_rules = {
{36, 36, 22, 22, "$__MUL36X36"},
{18, 18, 10, 4, "$__MUL18X18"},
{18, 18, 4, 10, "$__MUL18X18"},
{9, 9, 4, 4, "$__MUL9X9"},
};
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
@ -97,13 +112,16 @@ struct SynthGowinPass : public ScriptPass
log(" -setundef\n");
log(" set undriven wires and parameters to zero\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, strict_gw5a_dffs, nowidelut, abc9, noiopads, noalu, no_rw_check, setundef;
bool retime, nobram, nolutram, flatten, nodffe, strict_gw5a_dffs, nowidelut, abc9, noiopads, noalu, no_rw_check, setundef, nodsp;
void clear_flags() override
{
@ -123,6 +141,7 @@ struct SynthGowinPass : public ScriptPass
noalu = false;
no_rw_check = false;
setundef = false;
nodsp = false;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -209,6 +228,10 @@ struct SynthGowinPass : public ScriptPass
setundef = true;
continue;
}
if (args[argidx] == "-nodsp") {
nodsp = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -239,17 +262,40 @@ struct SynthGowinPass : public ScriptPass
run(stringf("hierarchy -check %s", help_mode ? "-top <top>" : top_opt));
}
if (flatten && check_label("flatten", "(unless -noflatten)"))
{
run("proc");
run("flatten");
run("tribuf -logic");
run("deminout");
}
if (check_label("coarse"))
{
run("synth -run coarse" + no_rw_check_opt);
run("proc");
if (flatten || help_mode)
run("flatten", "(unless -noflatten)");
run("tribuf -logic");
run("deminout");
run("opt_expr");
run("opt_clean");
run("check");
run("opt -nodffe -nosdff");
run("fsm");
run("opt");
run("wreduce");
run("peepopt");
run("opt_clean");
run("share");
if (help_mode) {
run("techmap -map +/mul2dsp.v [...]", "(unless -nodsp and if -family gw1n or gw2a)");
run("techmap -map +/gowin/dsp_map.v", "(unless -nodsp and if -family gw1n or gw2a)");
} else if (!nodsp && (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));
run("chtype -set $mul t:$__soft_mul");
}
run("techmap -map +/gowin/dsp_map.v");
}
run("alumacc");
run("opt");
run("memory -nomap" + no_rw_check_opt);
run("opt_clean");
}
if (check_label("map_ram"))