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synth_xilinx: Use opt_dff.

Browse source 
The main part is converting xilinx_dsp to recognize the new FF types
created in opt_dff instead of trying to recognize the patterns on its
own.

The fsm call has been moved upwards because the passes cannot deal with
$dffe/$sdff*, and other optimizations don't help it much anyway.
This commit is contained in:
Marcelina Kościelnicka 2020-07-22 12:27:15 +02:00
parent 4a05cad7f8
commit 8501342fc5
7 changed files with 219 additions and 887 deletions
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29
techlibs/xilinx/synth_xilinx.cc
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@ -358,6 +358,10 @@ struct SynthXilinxPass : public ScriptPass
run("opt_clean");
run("check");
run("opt");
run("fsm");
run("opt");
run("opt_dff");
run("opt");
if (help_mode)
run("wreduce [-keepdc]", "(option for '-widemux')");
else
@ -444,8 +448,6 @@ struct SynthXilinxPass : public ScriptPass
run("alumacc");
run("share");
run("opt");
run("fsm");
run("opt -fast");
run("memory -nomap");
run("opt_clean");
}
@ -504,28 +506,21 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("map_ffram")) {
// Required for dff2dffs to work.
run("simplemap t:$dff t:$adff t:$mux");
// Needs to be done before opt -mux_bool happens.
if (help_mode)
run("dff2dffs [-match-init]", "(-match-init for xc6s only)");
else if (family == "xc6s")
run("dff2dffs -match-init");
else
run("dff2dffs");
if (widemux > 0)
if (widemux > 0) {
run("opt -fast -mux_bool -undriven -fine"); // Necessary to omit -mux_undef otherwise muxcover
// performs less efficiently
else
} else {
run("opt -fast -full");
}
run("memory_map");
}
if (check_label("fine")) {
run("dff2dffe -direct-match $_DFF_* -direct-match $_SDFF_*");
if (help_mode)
run("muxcover <internal options> ('-widemux' only)");
else if (widemux > 0) {
if (help_mode) {
run("simplemap t:$mux", "('-widemux' only)");
run("muxcover <internal options>", "('-widemux' only)");
} else if (widemux > 0) {
run("simplemap t:$mux");
constexpr int cost_mux2 = 100;
std::string muxcover_args = stringf(" -nodecode -mux2=%d", cost_mux2);
switch (widemux) {