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synth_xilinx -widemux=2 is minimum now

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This commit is contained in:
Eddie Hung 2019-07-08 11:29:21 -07:00
parent dbe1326573
commit 0944acf3af
1 changed files with 7 additions and 4 deletions
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11
techlibs/xilinx/synth_xilinx.cc
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@ -79,7 +79,7 @@ struct SynthXilinxPass : public ScriptPass
log("\n");
log(" -widemux <int>\n");
log(" enable inference of hard multiplexer resources (MuxFx) for muxes at or\n");
log(" above this number of inputs (minimum value 5).\n");
log(" above this number of inputs (minimum value 2).\n");
log(" default: 0 (no inference)\n");
log("\n");
log(" -run <from_label>:<to_label>\n");
@ -208,8 +208,8 @@ struct SynthXilinxPass : public ScriptPass
if (family != "xcup" && family != "xcu" && family != "xc7" && family != "xc6s")
log_cmd_error("Invalid Xilinx -family setting: %s\n", family.c_str());
if (widemux != 0 && widemux < 5)
log_cmd_error("-widemux value must be 0 or >= 5.\n");
if (widemux != 0 && widemux < 2)
log_cmd_error("-widemux value must be 0 or >= 2.\n");
if (!design->full_selection())
log_cmd_error("This command only operates on fully selected designs!\n");
@ -252,7 +252,7 @@ struct SynthXilinxPass : public ScriptPass
// so attempt to convert $pmux-es to the former
// Also: wide multiplexer inference benefits from this too
if (!(nosrl && widemux == 0) || help_mode)
run("pmux2shiftx", "(skip if '-nosrl' and '-widemux' < 5)");
run("pmux2shiftx", "(skip if '-nosrl' and '-widemux=0')");
}
if (check_label("bram", "(skip if '-nobram')")) {
@ -283,6 +283,9 @@ struct SynthXilinxPass : public ScriptPass
constexpr int cost_mux2 = 100;
std::string muxcover_args = stringf(" -nodecode -mux2=%d", cost_mux2);
switch (widemux) {
case 2:
case 3:
case 4: muxcover_args += stringf(" -mux4=%d -mux8=%d -mux16=%d", cost_mux2*(widemux-1)-2, cost_mux2*(widemux-1)-1, cost_mux2*(widemux-1)); break;
case 5:
case 6:
case 7: