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verilog_backend: Add -noparallelcase option

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This commit is contained in:
Jannis Harder 2022-11-10 16:16:37 +01:00
parent 99163fb822
commit 5cb7d0fe9d
1 changed files with 31 additions and 7 deletions
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38
backends/verilog/verilog_backend.cc
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@ -35,7 +35,7 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
bool verbose, norename, noattr, attr2comment, noexpr, nodec, nohex, nostr, extmem, defparam, decimal, siminit, systemverilog, simple_lhs;
bool verbose, norename, noattr, attr2comment, noexpr, nodec, nohex, nostr, extmem, defparam, decimal, siminit, systemverilog, simple_lhs, noparallelcase;
int auto_name_counter, auto_name_offset, auto_name_digits, extmem_counter;
std::map<RTLIL::IdString, int> auto_name_map;
std::set<RTLIL::IdString> reg_wires;
@ -1314,24 +1314,38 @@ bool dump_cell_expr(std::ostream &f, std::string indent, RTLIL::Cell *cell)
f << stringf("%s" " input [%d:0] s;\n", indent.c_str(), s_width-1);
dump_attributes(f, indent + " ", cell->attributes);
if (!noattr)
f << stringf("%s" " (* parallel_case *)\n", indent.c_str());
f << stringf("%s" " casez (s)", indent.c_str());
f << stringf(noattr ? " // synopsys parallel_case\n" : "\n");
if (noparallelcase)
f << stringf("%s" " case (s)\n", indent.c_str());
else {
if (!noattr)
f << stringf("%s" " (* parallel_case *)\n", indent.c_str());
f << stringf("%s" " casez (s)", indent.c_str());
f << stringf(noattr ? " // synopsys parallel_case\n" : "\n");
}
for (int i = 0; i < s_width; i++)
{
f << stringf("%s" " %d'b", indent.c_str(), s_width);
for (int j = s_width-1; j >= 0; j--)
f << stringf("%c", j == i ? '1' : '?');
f << stringf("%c", j == i ? '1' : noparallelcase ? '0' : '?');
f << stringf(":\n");
f << stringf("%s" " %s = b[%d:%d];\n", indent.c_str(), func_name.c_str(), (i+1)*width-1, i*width);
}
f << stringf("%s" " default:\n", indent.c_str());
if (noparallelcase) {
f << stringf("%s" " %d'b", indent.c_str(), s_width);
for (int j = s_width-1; j >= 0; j--)
f << '0';
f << stringf(":\n");
} else
f << stringf("%s" " default:\n", indent.c_str());
f << stringf("%s" " %s = a;\n", indent.c_str(), func_name.c_str());
if (noparallelcase) {
f << stringf("%s" " default:\n", indent.c_str());
f << stringf("%s" " %s = %d'bx;\n", indent.c_str(), func_name.c_str(), width);
}
f << stringf("%s" " endcase\n", indent.c_str());
f << stringf("%s" "endfunction\n", indent.c_str());
@ -2136,6 +2150,11 @@ struct VerilogBackend : public Backend {
log(" without this option all internal cells are converted to Verilog\n");
log(" expressions.\n");
log("\n");
log(" -noparallelcase\n");
log(" With this option no parallel_case attributes are used. Instead, a case\n");
log(" statement that assigns don't-care values for priority dependent inputs\n");
log(" is generated.\n");
log("\n");
log(" -siminit\n");
log(" add initial statements with hierarchical refs to initialize FFs when\n");
log(" in -noexpr mode.\n");
@ -2211,6 +2230,7 @@ struct VerilogBackend : public Backend {
decimal = false;
siminit = false;
simple_lhs = false;
noparallelcase = false;
auto_prefix = "";
bool blackboxes = false;
@ -2246,6 +2266,10 @@ struct VerilogBackend : public Backend {
noexpr = true;
continue;
}
if (arg == "-noparallelcase") {
noparallelcase = true;
continue;
}
if (arg == "-nodec") {
nodec = true;
continue;