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Progress in SMV back-end

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This commit is contained in:
Clifford Wolf 2015-06-17 07:24:27 +02:00
parent b8c5e27006
commit 9f7a5b4ef9
1 changed files with 64 additions and 11 deletions
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75
backends/smv/smv.cc
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@ -115,15 +115,17 @@ struct SmvWorker
sigmap.apply(sig);
for (auto &c : sig.chunks()) {
if (!s.empty())
s += " :: ";
s = " :: " + s;
if (c.wire) {
s += cid(c.wire->name);
if (c.offset != 0 || c.width != c.wire->width)
s += stringf("[%d:%d]", c.offset+c.width-1, c.offset);
s = stringf("%s[%d:%d]", cid(c.wire->name), c.offset+c.width-1, c.offset) + s;
else
s = cid(c.wire->name) + s;
} else {
s += stringf("0ub%d_", c.width);
string v = stringf("0ub%d_", c.width);
for (int i = c.width-1; i >= 0; i--)
s += c.data.at(i) == State::S1 ? '1' : '0';
v += c.data.at(i) == State::S1 ? '1' : '0';
s = v + s;
}
}
@ -168,8 +170,59 @@ struct SmvWorker
for (auto cell : module->cells())
{
// FIXME: $not, $pos, $neg, $slice, $concat,
// $shl, $shr, $sshl, $sshr, $shift, $shiftx, $mem
// FIXME: $slice, $concat, $mem
if (cell->type.in("$shl", "$shr", "$sshl", "$sshr", "$shift", "$shiftx"))
{
int width_y = GetSize(cell->getPort("\\Y"));
int width = std::max(GetSize(cell->getPort("\\A")), width_y);
bool signed_a = cell->getParam("\\A_SIGNED").as_bool();
string op = cell->type.in("$shl", "$sshl") ? "<<" : ">>";
string expr, expr_a;
if (signed_a) {
expr_a = stringf("resize(signed(%s), %d)", rvalue(cell->getPort("\\A")), width);
} else
expr_a = stringf("resize(%s, %d)", rvalue(cell->getPort("\\A")), width);
if (cell->type == "$sshr" && signed_a) {
expr = stringf("resize(%s %s %s, %d)", expr_a.c_str(), op.c_str(), rvalue(cell->getPort("\\B")), width_y);
} else {
if (signed_a)
expr_a = "unsigned(" + expr_a + ")";
if (cell->type.in("$shift", "$shiftx") && cell->getParam("\\B_SIGNED").as_bool())
expr = stringf("resize(%s %s signed(%s), %d)", expr_a.c_str(), op.c_str(), rvalue(cell->getPort("\\B")), width_y);
else
expr = stringf("resize(%s %s %s, %d)", expr_a.c_str(), op.c_str(), rvalue(cell->getPort("\\B")), width_y);
}
assignments.push_back(stringf("%s := %s;", lvalue(cell->getPort("\\Y")), expr.c_str()));
continue;
}
if (cell->type.in("$not", "$pos", "$neg"))
{
int width = GetSize(cell->getPort("\\Y"));
string expr_a, op;
if (cell->type == "$not") op = "!";
if (cell->type == "$pos") op = "";
if (cell->type == "$neg") op = "-";
if (cell->getParam("\\A_SIGNED").as_bool())
{
expr_a = stringf("resize(signed(%s), %d)", rvalue(cell->getPort("\\A")), width);
assignments.push_back(stringf("%s := unsigned(%s%s);", lvalue(cell->getPort("\\Y")), op.c_str(), expr_a.c_str()));
}
else
{
expr_a = stringf("resize(%s, %d)", rvalue(cell->getPort("\\A")), width);
assignments.push_back(stringf("%s := %s%s;", lvalue(cell->getPort("\\Y")), op.c_str(), expr_a.c_str()));
}
continue;
}
if (cell->type.in("$add", "$sub", "$mul", "$div", "$mod", "$and", "$or", "$xor", "$xnor"))
{
@ -344,14 +397,14 @@ struct SmvWorker
int offset = 0;
for (auto rhs : it.second) {
if (!expr.empty())
expr += " :: ";
expr = " :: " + expr;
if (offset < rhs.offset)
expr += stringf(" 0ub%d_0 :: ", rhs.offset - offset);
expr += rhs.rhs_expr;
expr = stringf(" :: 0ub%d_0 ", rhs.offset - offset) + expr;
expr = rhs.rhs_expr + expr;
offset = rhs.offset + rhs.width;
}
if (offset < it.first->width)
expr += stringf(" :: 0ub%d_0", it.first->width - offset);
expr = stringf("0ub%d_0 :: ", it.first->width - offset) + expr;
assignments.push_back(stringf("%s := %s;", cid(it.first->name), expr.c_str()));
}