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Add csa to synth.

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This commit is contained in:
nella 2026-03-16 15:39:54 +01:00
parent 4b037bda7a
commit 18c7cb094e
1 changed files with 13 additions and 3 deletions
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14
techlibs/common/synth.cc
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@ -67,6 +67,10 @@ struct SynthPass : public ScriptPass {
log(" -booth\n"); log(" -booth\n");
log(" run the booth pass to map $mul to Booth encoded multipliers\n"); log(" run the booth pass to map $mul to Booth encoded multipliers\n");
log("\n"); log("\n");
log(" -csa\n");
log(" run the csa_tree pass to convert $add/$sub chains to\n");
log(" carry-save adder trees.\n");
log("\n");
log(" -noalumacc\n"); log(" -noalumacc\n");
log(" do not run 'alumacc' pass. i.e. keep arithmetic operators in\n"); log(" do not run 'alumacc' pass. i.e. keep arithmetic operators in\n");
log(" their direct form ($add, $sub, etc.).\n"); log(" their direct form ($add, $sub, etc.).\n");
@ -108,7 +112,7 @@ struct SynthPass : public ScriptPass {
} }
string top_module, fsm_opts, memory_opts, abc; string top_module, fsm_opts, memory_opts, abc;
bool autotop, flatten, noalumacc, nofsm, noabc, noshare, flowmap, booth, hieropt, relative_share; bool autotop, flatten, noalumacc, nofsm, noabc, noshare, flowmap, booth, csa, hieropt, relative_share;
int lut; int lut;
std::vector<std::string> techmap_maps; std::vector<std::string> techmap_maps;
@ -127,6 +131,7 @@ struct SynthPass : public ScriptPass {
noshare = false; noshare = false;
flowmap = false; flowmap = false;
booth = false; booth = false;
csa = false;
hieropt = false; hieropt = false;
relative_share = false; relative_share = false;
abc = "abc"; abc = "abc";
@ -187,7 +192,10 @@ struct SynthPass : public ScriptPass {
booth = true; booth = true;
continue; continue;
} }
if (args[argidx] == "-csa") {
csa = true;
continue;
}
if (args[argidx] == "-nordff") { if (args[argidx] == "-nordff") {
memory_opts += " -nordff"; memory_opts += " -nordff";
continue; continue;
@ -287,6 +295,8 @@ struct SynthPass : public ScriptPass {
run(stringf("%s -map +/cmp2lut.v -map +/cmp2lcu.v -D LUT_WIDTH=%d", techmap_cmd, lut)); run(stringf("%s -map +/cmp2lut.v -map +/cmp2lcu.v -D LUT_WIDTH=%d", techmap_cmd, lut));
if (booth || help_mode) if (booth || help_mode)
run("booth", " (if -booth)"); run("booth", " (if -booth)");
if (csa || help_mode)
run("csa_tree", " (if -csa)");
if (!noalumacc) if (!noalumacc)
run("alumacc", " (unless -noalumacc)"); run("alumacc", " (unless -noalumacc)");
if (!noshare) if (!noshare)