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Improve "pmux2shiftx"

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-04-20 02:03:44 +02:00
parent e06d158e8a
commit b3a3e08e38
2 changed files with 9 additions and 11 deletions
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18
passes/opt/pmux2shiftx.cc
View file

@ -33,9 +33,9 @@ struct Pmux2ShiftxPass : public Pass {
log("\n"); log("\n");
log("This pass transforms $pmux cells to $shiftx cells.\n"); log("This pass transforms $pmux cells to $shiftx cells.\n");
log("\n"); log("\n");
log(" -min_density <non_offset_percentage> <offset_percentage>\n"); log(" -min_density <percentage>\n");
log(" specifies the minimum density for non_offset- and for offset-mode\n"); log(" specifies the minimum density for the shifter\n");
log(" default values are 30 (non-offset) and 50 (offset)\n"); log(" default: 50\n");
log("\n"); log("\n");
log(" -min_choices <int>\n"); log(" -min_choices <int>\n");
log(" specified the minimum number of choices for a control signal\n"); log(" specified the minimum number of choices for a control signal\n");
@ -48,8 +48,7 @@ struct Pmux2ShiftxPass : public Pass {
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{ {
int min_non_offset_percentage = 30; int min_density = 50;
int min_offset_percentage = 50;
int min_choices = 3; int min_choices = 3;
bool allow_onehot = false; bool allow_onehot = false;
@ -57,9 +56,8 @@ struct Pmux2ShiftxPass : public Pass {
size_t argidx; size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) { for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-min_density" && argidx+2 < args.size()) { if (args[argidx] == "-min_density" && argidx+1 < args.size()) {
min_non_offset_percentage = atoi(args[++argidx].c_str()); min_density = atoi(args[++argidx].c_str());
min_offset_percentage = atoi(args[++argidx].c_str());
continue; continue;
} }
if (args[argidx] == "-min_choices" && argidx+1 < args.size()) { if (args[argidx] == "-min_choices" && argidx+1 < args.size()) {
@ -369,7 +367,7 @@ struct Pmux2ShiftxPass : public Pass {
// check density percentages // check density percentages
Const offset(State::S0, GetSize(sig)); Const offset(State::S0, GetSize(sig));
if (absolute_density < min_non_offset_percentage && range_density >= min_offset_percentage) if (absolute_density < min_density && range_density >= min_density)
{ {
offset = Const(min_choice, GetSize(sig)); offset = Const(min_choice, GetSize(sig));
log(" offset: %s\n", log_signal(offset)); log(" offset: %s\n", log_signal(offset));
@ -382,7 +380,7 @@ struct Pmux2ShiftxPass : public Pass {
new_perm_choices[const_sub(it.first, offset, false, false, GetSize(sig))] = it.second; new_perm_choices[const_sub(it.first, offset, false, false, GetSize(sig))] = it.second;
perm_choices.swap(new_perm_choices); perm_choices.swap(new_perm_choices);
} else } else
if (absolute_density < min_non_offset_percentage) { if (absolute_density < min_density) {
log(" insufficient density.\n"); log(" insufficient density.\n");
seldb.erase(sig); seldb.erase(sig);
continue; continue;

2
tests/various/pmux2shiftx.ys
View file

@ -2,7 +2,7 @@ read_verilog pmux2shiftx.v
prep prep
design -save gold design -save gold
pmux2shiftx -min_density 70 50 pmux2shiftx -min_density 70
opt opt