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Merge pull request #772 from whitequark/synth_lut

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synth: add k-LUT mode
This commit is contained in:
Clifford Wolf 2019-01-02 15:44:57 +01:00 • committed by GitHub
commit da1c8d8d3d
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 41 additions and 7 deletions
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42
techlibs/common/synth.cc
View file

@ -51,6 +51,9 @@ struct SynthPass : public ScriptPass
log(" -encfile <file>\n");
log(" passed to 'fsm_recode' via 'fsm'\n");
log("\n");
log(" -lut <k>\n");
log(" perform synthesis for a k-LUT architecture.\n");
log("\n");
log(" -nofsm\n");
log(" do not run FSM optimization\n");
log("\n");
@ -80,6 +83,7 @@ struct SynthPass : public ScriptPass
string top_module, fsm_opts, memory_opts;
bool autotop, flatten, noalumacc, nofsm, noabc, noshare;
int lut;
void clear_flags() YS_OVERRIDE
{
@ -89,6 +93,7 @@ struct SynthPass : public ScriptPass
autotop = false;
flatten = false;
lut = 0;
noalumacc = false;
nofsm = false;
noabc = false;
@ -130,6 +135,10 @@ struct SynthPass : public ScriptPass
flatten = true;
continue;
}
if (args[argidx] == "-lut") {
lut = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-nofsm") {
nofsm = true;
continue;
@ -192,13 +201,17 @@ struct SynthPass : public ScriptPass
run("check");
run("opt");
run("wreduce");
if (help_mode)
run("techmap -map +/cmp2lut.v", " (if -lut)");
else
run(stringf("techmap -map +/cmp2lut.v -D LUT_WIDTH=%d", lut));
if (!noalumacc)
run("alumacc");
run("alumacc", " (unless -noalumacc)");
if (!noshare)
run("share");
run("share", " (unless -noshare)");
run("opt");
if (!nofsm)
run("fsm" + fsm_opts);
run("fsm" + fsm_opts, " (unless -nofsm)");
run("opt -fast");
run("memory -nomap" + memory_opts);
run("opt_clean");
@ -210,12 +223,33 @@ struct SynthPass : public ScriptPass
run("memory_map");
run("opt -full");
run("techmap");
if (help_mode)
{
run("techmap -map +/gate2lut.v", "(if -noabc and -lut)");
run("clean; opt_lut", " (if -noabc and -lut)");
}
else if (noabc && lut)
{
run(stringf("techmap -map +/gate2lut.v -D LUT_WIDTH=%d", lut));
run("clean; opt_lut");
}
run("opt -fast");
if (!noabc) {
#ifdef YOSYS_ENABLE_ABC
if (help_mode)
{
run("abc -fast", " (unless -noabc, unless -lut)");
run("abc -fast -lut k", "(unless -noabc, if -lut)");
}
else
{
if (lut)
run(stringf("abc -fast -lut %d", lut));
else
run("abc -fast");
run("opt -fast");
}
run("opt -fast", " (unless -noabc)");
#endif
}
}

2
techlibs/ice40/synth_ice40.cc
View file

@ -226,7 +226,7 @@ struct SynthIce40Pass : public ScriptPass
if (check_label("coarse"))
{
run("synth -run coarse");
run("synth -lut 4 -run coarse");
}
if (!nobram && check_label("bram", "(skip if -nobram)"))