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Assign from rvalue via temporary register in nowrshmsk CASE

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Avoid repeating complex rvalue expressions for each condition.
This commit is contained in:
Dag Lem 2023-12-08 20:47:43 +01:00
parent dbec704b49
commit 1a2b4759e8
3 changed files with 35 additions and 3 deletions
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19
frontends/ast/ast.cc
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@ -850,6 +850,25 @@ AstNode *AstNode::mkconst_str(const std::string &str)
return node;
}
// create a temporary register
AstNode *AstNode::mktemp_logic(const std::string &name, AstNode *mod, bool nosync, int range_left, int range_right, bool is_signed)
{
AstNode *wire = new AstNode(AST_WIRE, new AstNode(AST_RANGE, mkconst_int(range_left, true), mkconst_int(range_right, true)));
wire->str = stringf("%s%s:%d$%d", name.c_str(), RTLIL::encode_filename(filename).c_str(), location.first_line, autoidx++);
if (nosync)
wire->set_attribute(ID::nosync, AstNode::mkconst_int(1, false));
wire->is_signed = is_signed;
wire->is_logic = true;
mod->children.push_back(wire);
while (wire->simplify(true, 1, -1, false)) { }
AstNode *ident = new AstNode(AST_IDENTIFIER);
ident->str = wire->str;
ident->id2ast = wire;
return ident;
}
bool AstNode::bits_only_01() const
{
for (auto bit : bits)