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More progress in FIRRTL back-end

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This commit is contained in:
Clifford Wolf 2016-11-18 02:41:29 +01:00
parent c051115e03
commit e01382739d
3 changed files with 121 additions and 4 deletions
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96
backends/firrtl/firrtl.cc
View file

@ -190,6 +190,102 @@ struct FirrtlWorker
continue;
}
if (cell->type.in("$mux"))
{
string y_id = make_id(cell->name);
int width = cell->parameters.at("\\WIDTH").as_int();
string a_expr = make_expr(cell->getPort("\\A"));
string b_expr = make_expr(cell->getPort("\\B"));
string s_expr = make_expr(cell->getPort("\\S"));
wire_decls.push_back(stringf(" wire %s: UInt<%d>\n", y_id.c_str(), width));
string expr = stringf("mux(%s, %s, %s)", s_expr.c_str(), b_expr.c_str(), a_expr.c_str());
cell_exprs.push_back(stringf(" %s <= %s\n", y_id.c_str(), expr.c_str()));
register_reverse_wire_map(y_id, cell->getPort("\\Y"));
continue;
}
if (cell->type.in("$mem"))
{
string mem_id = make_id(cell->name);
int abits = cell->parameters.at("\\ABITS").as_int();
int width = cell->parameters.at("\\WIDTH").as_int();
int size = cell->parameters.at("\\SIZE").as_int();
int rd_ports = cell->parameters.at("\\RD_PORTS").as_int();
int wr_ports = cell->parameters.at("\\WR_PORTS").as_int();
Const initdata = cell->parameters.at("\\INIT");
for (State bit : initdata.bits)
if (bit != State::Sx)
log_error("Memory with initialization data: %s.%s\n", log_id(module), log_id(cell));
Const rd_clk_enable = cell->parameters.at("\\RD_CLK_ENABLE");
Const wr_clk_enable = cell->parameters.at("\\WR_CLK_ENABLE");
Const wr_clk_polarity = cell->parameters.at("\\WR_CLK_POLARITY");
int offset = cell->parameters.at("\\OFFSET").as_int();
if (offset != 0)
log_error("Memory with nonzero offset: %s.%s\n", log_id(module), log_id(cell));
cell_exprs.push_back(stringf(" mem %s:\n", mem_id.c_str()));
cell_exprs.push_back(stringf(" data-type => UInt<%d>\n", width));
cell_exprs.push_back(stringf(" depth => %d\n", size));
for (int i = 0; i < rd_ports; i++)
cell_exprs.push_back(stringf(" reader => r%d\n", i));
for (int i = 0; i < wr_ports; i++)
cell_exprs.push_back(stringf(" writer => w%d\n", i));
cell_exprs.push_back(stringf(" read-latency => 0\n"));
cell_exprs.push_back(stringf(" write-latency => 1\n"));
cell_exprs.push_back(stringf(" read-under-write => undefined\n"));
for (int i = 0; i < rd_ports; i++)
{
if (rd_clk_enable[i] != State::S0)
log_error("Clocked read port %d on memory %s.%s.\n", i, log_id(module), log_id(cell));
SigSpec data_sig = cell->getPort("\\RD_DATA").extract(i*width, width);
string addr_expr = make_expr(cell->getPort("\\RD_ADDR").extract(i*abits, abits));
cell_exprs.push_back(stringf(" %s.r%d.addr <= %s\n", mem_id.c_str(), i, addr_expr.c_str()));
cell_exprs.push_back(stringf(" %s.r%d.en <= UInt<1>(1)\n", mem_id.c_str(), i));
cell_exprs.push_back(stringf(" %s.r%d.clk <= asClock(UInt<1>(0))\n", mem_id.c_str(), i));
register_reverse_wire_map(stringf("%s.r%d.data", mem_id.c_str(), i), data_sig);
}
for (int i = 0; i < wr_ports; i++)
{
if (wr_clk_enable[i] != State::S1)
log_error("Unclocked write port %d on memory %s.%s.\n", i, log_id(module), log_id(cell));
if (wr_clk_polarity[i] != State::S1)
log_error("Negedge write port %d on memory %s.%s.\n", i, log_id(module), log_id(cell));
string addr_expr = make_expr(cell->getPort("\\WR_ADDR").extract(i*abits, abits));
string data_expr = make_expr(cell->getPort("\\WR_DATA").extract(i*width, width));
string clk_expr = make_expr(cell->getPort("\\WR_CLK").extract(i));
SigSpec wen_sig = cell->getPort("\\WR_EN").extract(i*width, width);
string wen_expr = make_expr(wen_sig[0]);
for (int i = 1; i < GetSize(wen_sig); i++)
if (wen_sig[0] != wen_sig[i])
log_error("Complex write enable on port %d on memory %s.%s.\n", i, log_id(module), log_id(cell));
cell_exprs.push_back(stringf(" %s.w%d.addr <= %s\n", mem_id.c_str(), i, addr_expr.c_str()));
cell_exprs.push_back(stringf(" %s.w%d.data <= %s\n", mem_id.c_str(), i, data_expr.c_str()));
cell_exprs.push_back(stringf(" %s.w%d.en <= %s\n", mem_id.c_str(), i, wen_expr.c_str()));
cell_exprs.push_back(stringf(" %s.w%d.clk <= asClock(%s)\n", mem_id.c_str(), i, clk_expr.c_str()));
}
continue;
}
if (cell->type.in("$dff"))
{
bool clkpol = cell->parameters.at("\\CLK_POLARITY").as_bool();

3
backends/firrtl/test.sh
View file

@ -1,7 +1,7 @@
#!/bin/bash
set -ex
../../yosys -p 'prep; write_firrtl test.fir' test.v
../../yosys -p 'prep -nordff; write_firrtl test.fir' test.v
firrtl -i test.fir -o test_out.v
@ -13,6 +13,7 @@ firrtl -i test.fir -o test_out.v
rename test gate
prep
memory_map
miter -equiv -flatten gold gate miter
hierarchy -top miter

26
backends/firrtl/test.v
View file

@ -1,4 +1,24 @@
module test(input clk, signed input [7:0] a, b, x, output [15:0] s, d, y, z, u, q);
assign s = a+{b[6:2], 2'b1}, d = a-b, y = x, z[7:0] = s+d, z[15:8] = s-d;
always @(posedge clk) q <= s ^ d ^ x;
module test(
input clk, wen,
input [4:0] waddr, raddr,
input [31:0] wdata,
output reg [31:0] rdata,
signed input [7:0] a, b, x,
output [15:0] s, d, y, z, u, q
);
reg [31:0] memory [0:31];
always @(posedge clk) begin
rdata <= memory[raddr];
if (wen) memory[waddr] <= wdata;
end
assign s = a+{b[6:2], 2'b1};
assign d = a-b;
assign y = x;
assign z[7:0] = s+d;
assign z[15:8] = s-d;
always @(posedge clk)
q <= s ^ d ^ x;
endmodule