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Only run derive on blackbox modules when ports have dynamic size

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-03-02 12:36:46 -08:00
parent ce6695e22c
commit ae9286386d
4 changed files with 24 additions and 1 deletions
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1
frontends/ast/ast.h
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@ -239,6 +239,7 @@ namespace AST
bool has_const_only_constructs(bool &recommend_const_eval);
void replace_variables(std::map<std::string, varinfo_t> &variables, AstNode *fcall);
AstNode *eval_const_function(AstNode *fcall);
bool is_simple_const_expr();
// create a human-readable text representation of the AST (for debugging)
void dumpAst(FILE *f, std::string indent) const;

19
frontends/ast/simplify.cc
View file

@ -328,6 +328,15 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
for (size_t i = 0; i < children.size(); i++) {
AstNode *node = children[i];
if (node->type == AST_WIRE) {
if (node->children.size() == 1 && node->children[0]->type == AST_RANGE) {
for (auto c : node->children[0]->children) {
if (!c->is_simple_const_expr()) {
if (attributes.count("\\dynports"))
delete attributes.at("\\dynports");
attributes["\\dynports"] = AstNode::mkconst_int(1, true);
}
}
}
if (this_wire_scope.count(node->str) > 0) {
AstNode *first_node = this_wire_scope[node->str];
if (first_node->is_input && node->is_reg)
@ -3323,6 +3332,16 @@ bool AstNode::has_const_only_constructs(bool &recommend_const_eval)
return false;
}
bool AstNode::is_simple_const_expr()
{
if (type == AST_IDENTIFIER)
return false;
for (auto child : children)
if (!child->is_simple_const_expr())
return false;
return true;
}
// helper function for AstNode::eval_const_function()
void AstNode::replace_variables(std::map<std::string, AstNode::varinfo_t> &variables, AstNode *fcall)
{