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Bugfix in partial mem write handling in verilog back-end

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This commit is contained in:
Clifford Wolf 2016-08-20 13:06:06 +02:00
parent d77a914683
commit 75bf7416f0
1 changed files with 26 additions and 42 deletions
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68
backends/verilog/verilog_backend.cc
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@ -908,13 +908,9 @@ bool dump_cell_expr(std::ostream &f, std::string indent, RTLIL::Cell *cell)
}
int nwrite_ports = cell->parameters["\\WR_PORTS"].as_int();
RTLIL::SigSpec sig_wr_clk, sig_wr_data, sig_wr_addr, sig_wr_en, sig_wr_en_bit;
RTLIL::SigBit last_bit;
RTLIL::SigSpec sig_wr_clk, sig_wr_data, sig_wr_addr, sig_wr_en;
bool wr_clk_posedge;
RTLIL::SigSpec lof_wen;
dict<RTLIL::SigSpec, int> wen_to_width;
SigMap sigmap(active_module);
int n, wen_width;
// write ports
for (int i=0; i < nwrite_ports; i++)
{
@ -922,7 +918,6 @@ bool dump_cell_expr(std::ostream &f, std::string indent, RTLIL::Cell *cell)
sig_wr_data = cell->getPort("\\WR_DATA").extract(i*width, width);
sig_wr_addr = cell->getPort("\\WR_ADDR").extract(i*abits, abits);
sig_wr_en = cell->getPort("\\WR_EN").extract(i*width, width);
sig_wr_en_bit = sig_wr_en.extract(0);
wr_clk_posedge = cell->parameters["\\WR_CLK_POLARITY"].extract(i).as_bool();
{
std::ostringstream os;
@ -931,48 +926,37 @@ bool dump_cell_expr(std::ostream &f, std::string indent, RTLIL::Cell *cell)
if( clk_to_lof_body.count(clk_domain_str) == 0 )
clk_to_lof_body[clk_domain_str] = std::vector<std::string>();
}
// group the wen bits
last_bit = sig_wr_en.extract(0);
lof_wen = RTLIL::SigSpec(last_bit);
wen_to_width.clear();
wen_to_width[last_bit] = 0;
for (auto &current_bit : sig_wr_en.bits())
{
if (sigmap(current_bit) == sigmap(last_bit)){
wen_to_width[current_bit] += 1;
} else {
lof_wen.append_bit(current_bit);
wen_to_width[current_bit] = 1;
}
last_bit = current_bit;
}
// make something like:
// always @(posedge clk)
// if (wr_en_bit) memid[w_addr][??] <= w_data[??];
// ...
n = 0;
for (auto &wen_bit : lof_wen) {
wen_width = wen_to_width[wen_bit];
if (wen_bit != RTLIL::SigBit(false))
for (int i = 0; i < GetSize(sig_wr_en); i++)
{
int start_i = i, width = 1;
SigBit wen_bit = sig_wr_en[i];
while (i+1 < GetSize(sig_wr_en) && sigmap(sig_wr_en[i+1]) == sigmap(wen_bit))
i++, width++;
if (wen_bit == State::S0)
continue;
std::ostringstream os;
if (wen_bit != State::S1)
{
std::ostringstream os;
if (wen_bit != RTLIL::SigBit(true))
{
os << stringf("if (");
dump_sigspec(os, wen_bit);
os << stringf(") ");
}
os << stringf("%s[", mem_id.c_str());
dump_sigspec(os, sig_wr_addr);
if (wen_width == width)
os << stringf("] <= ");
else
os << stringf("][%d:%d] <= ", n+wen_width-1, n);
dump_sigspec(os, sig_wr_data.extract(n, wen_width));
os << stringf(";\n");
clk_to_lof_body[clk_domain_str].push_back(os.str());
os << stringf("if (");
dump_sigspec(os, wen_bit);
os << stringf(") ");
}
n += wen_width;
os << stringf("%s[", mem_id.c_str());
dump_sigspec(os, sig_wr_addr);
if (width == GetSize(sig_wr_en))
os << stringf("] <= ");
else
os << stringf("][%d:%d] <= ", i, start_i);
dump_sigspec(os, sig_wr_data.extract(start_i, width));
os << stringf(";\n");
clk_to_lof_body[clk_domain_str].push_back(os.str());
}
}
// Output Verilog that looks something like this: