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Added support for bufif0/bufif1 primitives

This commit is contained in:
Clifford Wolf 2013-08-19 19:50:04 +02:00
parent 4214561890
commit 8656b1c08f
2 changed files with 57 additions and 31 deletions
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26
frontends/ast/simplify.cc
View File

@ -498,6 +498,31 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage)
}
children.clear();
if (str == "bufif0" || str == "bufif1")
{
if (children_list.size() != 3)
log_error("Invalid number of arguments for primitive `%s' at %s:%d!\n",
str.c_str(), filename.c_str(), linenum);
std::vector<RTLIL::State> z_const(1, RTLIL::State::Sz);
AstNode *node = new AstNode(AST_TERNARY, children_list.at(2));
if (str == "bufif0") {
node->children.push_back(AstNode::mkconst_bits(z_const, false));
node->children.push_back(children_list.at(1));
} else {
node->children.push_back(children_list.at(1));
node->children.push_back(AstNode::mkconst_bits(z_const, false));
}
str.clear();
type = AST_ASSIGN;
children.push_back(children_list.at(0));
children.push_back(node);
did_something = true;
}
else
{
AstNodeType op_type = AST_NONE;
bool invert_results = false;
@ -532,6 +557,7 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage)
children.push_back(node);
did_something = true;
}
}
// replace dynamic ranges in left-hand side expressions (e.g. "foo[bar] <= 1'b1;") with
// a big case block that selects the correct single-bit assignment.

2
frontends/verilog/lexer.l
View File

@ -169,7 +169,7 @@ namespace VERILOG_FRONTEND {
}
<STRING>. { yymore(); }
and|nand|or|nor|xor|xnor|not|buf {
and|nand|or|nor|xor|xnor|not|buf|bufif0|bufif1 {
frontend_verilog_yylval.string = new std::string(yytext);
return TOK_PRIMITIVE;
}