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fabulous: add -multiplier-map option, map to $__FABULOUS_MUL

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- an example: `-multiplier-map multiplier_map.v 8:8:2:2:10`

Signed-off-by: Leo Moser <leomoser99@gmail.com>
This commit is contained in:
Leo Moser 2026-06-24 14:44:39 +02:00
parent d72cca2945
commit f79c0ad214
1 changed files with 40 additions and 2 deletions
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42
techlibs/fabulous/synth_fabulous.cc
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@ -61,6 +61,9 @@ struct SynthPass : public ScriptPass
log(" -clkbuf-map <clkbuf_map>\n");
log(" insert clock buffers using clkbufmap and map to the specified Verilog file.\n");
log("\n");
log(" -multiplier-map <multiplier_map> <a_max> <b_max> <a_min> <b_min> <y_min>\n");
log(" convert multiplications to multiplier primitives and map to the specified Verilog file.\n");
log("\n");
log(" -extra-plib <primitive_library.v>\n");
log(" use the specified Verilog file for extra primitives (can be specified multiple\n");
log(" times).\n");
@ -112,12 +115,12 @@ struct SynthPass : public ScriptPass
log("\n");
}
string top_module, json_file, blif_file, fsm_opts, memory_opts, carry_mode, clkbuf_map;
string top_module, json_file, blif_file, fsm_opts, memory_opts, carry_mode, clkbuf_map, multiplier_map;
std::vector<string> extra_plib, extra_map, extra_mlibmap;
std::vector<std::pair<string, string>> extra_ffs;
bool autotop, noalumacc, nofsm, noshare, noiopad, flatten;
int lut;
int lut, multiplier_a_max, multiplier_b_max, multiplier_a_min, multiplier_b_min, multiplier_y_min;
void clear_flags() override
{
@ -183,6 +186,15 @@ struct SynthPass : public ScriptPass
clkbuf_map = args[++argidx];
continue;
}
if (args[argidx] == "-multiplier-map" && argidx+6 < args.size()) {
multiplier_map = args[++argidx];
multiplier_a_max = atoi(args[++argidx].c_str());
multiplier_b_max = atoi(args[++argidx].c_str());
multiplier_a_min = atoi(args[++argidx].c_str());
multiplier_b_min = atoi(args[++argidx].c_str());
multiplier_y_min = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-extra-plib" && argidx+1 < args.size()) {
extra_plib.push_back(args[++argidx]);
continue;
@ -293,6 +305,32 @@ struct SynthPass : public ScriptPass
run("techmap -map +/cmp2lut.v -map +/cmp2lcu.v", " (if -lut)");
else if (lut)
run(stringf("techmap -map +/cmp2lut.v -map +/cmp2lcu.v -D LUT_WIDTH=%d", lut));
if (help_mode || multiplier_map != "") {
run("wreduce t:$mul");
if (help_mode) {
run("techmap -map +/mul2dsp.v -map <multiplier_map> -D DSP_A_MAXWIDTH=<a_max> -D DSP_B_MAXWIDTH=<b_max> "
"-D DSP_A_MINWIDTH=<a_min> -D DSP_B_MINWIDTH=<b_min> -D DSP_Y_MINWIDTH=<y_min> "
"-D DSP_NAME=$__FABULOUS_MUL", "(if -multiplier-map)");
} else {
run(stringf("techmap -map +/mul2dsp.v -map %s -D DSP_A_MAXWIDTH=%d -D DSP_B_MAXWIDTH=%d "
"-D DSP_A_MINWIDTH=%d -D DSP_B_MINWIDTH=%d -D DSP_Y_MINWIDTH=%d "
"-D DSP_NAME=$__FABULOUS_MUL",
multiplier_map.c_str(),
multiplier_a_max,
multiplier_b_max,
multiplier_a_min,
multiplier_b_min,
multiplier_y_min
)
);
}
run("select a:mul2dsp", " (if -multiplier-map)");
run("setattr -unset mul2dsp", " (if -multiplier-map)");
run("opt_expr -fine", " (if -multiplier-map)");
run("wreduce", " (if -multiplier-map)");
run("select -clear", " (if -multiplier-map)");
run("chtype -set $mul t:$__soft_mul", "(if -multiplier-map)");
}
if (!noalumacc)
run("alumacc", " (unless -noalumacc)");
if (!noshare)