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Merge branch 'master' into clifford/ids

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Clifford Wolf 2019-08-15 10:22:59 +02:00 • committed by GitHub
commit 85b0b2c589
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5 changed files with 261 additions and 143 deletions
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50
passes/opt/opt_expr.cc
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@ -641,7 +641,8 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
}
}
if (cell->type.in(ID($add), ID($sub))) {
if (cell->type.in(ID($add), ID($sub)))
{
RTLIL::SigSpec sig_a = assign_map(cell->getPort(ID(A)));
RTLIL::SigSpec sig_b = assign_map(cell->getPort(ID(B)));
RTLIL::SigSpec sig_y = cell->getPort(ID(Y));
@ -665,6 +666,53 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
did_something = true;
}
}
if (cell->type == "$alu")
{
RTLIL::SigSpec sig_a = assign_map(cell->getPort("\\A"));
RTLIL::SigSpec sig_b = assign_map(cell->getPort("\\B"));
RTLIL::SigBit sig_ci = assign_map(cell->getPort("\\CI"));
RTLIL::SigBit sig_bi = assign_map(cell->getPort("\\BI"));
RTLIL::SigSpec sig_x = cell->getPort("\\X");
RTLIL::SigSpec sig_y = cell->getPort("\\Y");
RTLIL::SigSpec sig_co = cell->getPort("\\CO");
if (sig_ci.wire || sig_bi.wire)
goto next_cell;
bool sub = (sig_ci == State::S1 && sig_bi == State::S1);
// If not a subtraction, yet there is a carry or B is inverted
// then no optimisation is possible as carry will not be constant
if (!sub && (sig_ci != State::S0 || sig_bi != State::S0))
goto next_cell;
int i;
for (i = 0; i < GetSize(sig_y); i++) {
if (sig_b.at(i, State::Sx) == State::S0 && sig_a.at(i, State::Sx) != State::Sx) {
module->connect(sig_x[i], sub ? module->Not(NEW_ID, sig_a[i]).as_bit() : sig_a[i]);
module->connect(sig_y[i], sig_a[i]);
module->connect(sig_co[i], sub ? State::S1 : State::S0);
}
else if (!sub && sig_a.at(i, State::Sx) == State::S0 && sig_b.at(i, State::Sx) != State::Sx) {
module->connect(sig_x[i], sig_b[i]);
module->connect(sig_y[i], sig_b[i]);
module->connect(sig_co[i], State::S0);
}
else
break;
}
if (i > 0) {
cover("opt.opt_expr.fine.$alu");
cell->setPort("\\A", sig_a.extract_end(i));
cell->setPort("\\B", sig_b.extract_end(i));
cell->setPort("\\X", sig_x.extract_end(i));
cell->setPort("\\Y", sig_y.extract_end(i));
cell->setPort("\\CO", sig_co.extract_end(i));
cell->fixup_parameters();
did_something = true;
}
}
}
if (cell->type.in(ID($reduce_xor), ID($reduce_xnor), ID($shift), ID($shiftx), ID($shl), ID($shr), ID($sshl), ID($sshr),