riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Use functions instead of always blocks for $mux/$pmux/$safe_pmux in verilog backend

This commit is contained in:
Clifford Wolf 2014-07-20 02:16:30 +02:00
parent 0c67393313
commit a30e2857c7
1 changed files with 21 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
backends/verilog/verilog_backend.cc
View File

@ -533,16 +533,18 @@ bool dump_cell_expr(FILE *f, std::string indent, RTLIL::Cell *cell)
{
int width = cell->parameters["\\WIDTH"].as_int();
int s_width = cell->connections["\\S"].width;
std::string reg_name = cellname(cell);
fprintf(f, "%s" "reg [%d:0] %s;\n", indent.c_str(), width-1, reg_name.c_str());
std::string func_name = cellname(cell);
dump_attributes(f, indent, cell->attributes);
fprintf(f, "%s" "function [%d:0] %s;\n", indent.c_str(), width-1, func_name.c_str());
fprintf(f, "%s" " input [%d:0] a;\n", indent.c_str(), width-1);
fprintf(f, "%s" " input [%d:0] b;\n", indent.c_str(), s_width*width-1);
fprintf(f, "%s" " input [%d:0] s;\n", indent.c_str(), s_width-1);
dump_attributes(f, indent + " ", cell->attributes);
if (!noattr)
fprintf(f, "%s" "(* parallel_case *)\n", indent.c_str());
fprintf(f, "%s" "always @*\n", indent.c_str());
fprintf(f, "%s" " casez (", indent.c_str());
dump_sigspec(f, cell->connections["\\S"]);
fprintf(f, noattr ? ") // synopsys parallel_case\n" : ")\n");
fprintf(f, "%s" " (* parallel_case *)\n", indent.c_str());
fprintf(f, "%s" " casez (s)", indent.c_str());
fprintf(f, noattr ? " // synopsys parallel_case\n" : "\n");
for (int i = 0; i < s_width; i++)
{
@ -552,22 +554,24 @@ bool dump_cell_expr(FILE *f, std::string indent, RTLIL::Cell *cell)
fprintf(f, "%c", j == i ? '1' : cell->type == "$pmux_safe" ? '0' : '?');
fprintf(f, ":\n");
fprintf(f, "%s" " %s = ", indent.c_str(), reg_name.c_str());
RTLIL::SigSpec s = cell->connections["\\B"].extract(i * width, width);
dump_sigspec(f, s);
fprintf(f, ";\n");
fprintf(f, "%s" " %s = b[%d:%d];\n", indent.c_str(), func_name.c_str(), (i+1)*width-1, i*width);
}
fprintf(f, "%s" " default:\n", indent.c_str());
fprintf(f, "%s" " %s = ", indent.c_str(), reg_name.c_str());
dump_sigspec(f, cell->connections["\\A"]);
fprintf(f, ";\n");
fprintf(f, "%s" " %s = a;\n", indent.c_str(), func_name.c_str());
fprintf(f, "%s" " endcase\n", indent.c_str());
fprintf(f, "%s" "endfunction\n", indent.c_str());
fprintf(f, "%s" "assign ", indent.c_str());
dump_sigspec(f, cell->connections["\\Y"]);
fprintf(f, " = %s;\n", reg_name.c_str());
fprintf(f, " = %s(", func_name.c_str());
dump_sigspec(f, cell->connections["\\A"]);
fprintf(f, ", ");
dump_sigspec(f, cell->connections["\\B"]);
fprintf(f, ", ");
dump_sigspec(f, cell->connections["\\S"]);
fprintf(f, ");\n");
return true;
}