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Merge pull request #744 from whitequark/write_verilog_$shift

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write_verilog: handle the $shift cell
This commit is contained in:
Clifford Wolf
2018-12-17 16:26:57 +01:00
committed by GitHub
parent dc6e63d8cd ca866d384e
commit ce701fd334
1 changed files with 29 additions and 0 deletions
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29
backends/verilog/verilog_backend.cc
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@@ -678,6 +678,35 @@ bool dump_cell_expr(std::ostream &f, std::string indent, RTLIL::Cell *cell)
#undef HANDLE_UNIOP
#undef HANDLE_BINOP
if (cell->type == "$shift")
{
f << stringf("%s" "assign ", indent.c_str());
dump_sigspec(f, cell->getPort("\\Y"));
f << stringf(" = ");
if (cell->getParam("\\B_SIGNED").as_bool())
{
f << stringf("$signed(");
dump_sigspec(f, cell->getPort("\\B"));
f << stringf(")");
f << stringf(" < 0 ? ");
dump_sigspec(f, cell->getPort("\\A"));
f << stringf(" << - ");
dump_sigspec(f, cell->getPort("\\B"));
f << stringf(" : ");
dump_sigspec(f, cell->getPort("\\A"));
f << stringf(" >> ");
dump_sigspec(f, cell->getPort("\\B"));
}
else
{
dump_sigspec(f, cell->getPort("\\A"));
f << stringf(" >> ");
dump_sigspec(f, cell->getPort("\\B"));
}
f << stringf(";\n");
return true;
}
if (cell->type == "$shiftx")
{
f << stringf("%s" "assign ", indent.c_str());