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Optionally suppress output from display system tasks in read_verilog

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This commit is contained in:
Dag Lem 2024-01-11 10:32:44 +01:00
parent 510d137996
commit 3ed9030eb4
4 changed files with 35 additions and 27 deletions
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42
frontends/ast/simplify.cc
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@ -1058,33 +1058,31 @@ bool AstNode::simplify(bool const_fold, int stage, int width_hint, bool sign_hin
{
if (!current_always) {
log_file_warning(filename, location.first_line, "System task `%s' outside initial or always block is unsupported.\n", str.c_str());
} else if (current_always->type == AST_INITIAL) {
int default_base = 10;
if (str.back() == 'b')
default_base = 2;
else if (str.back() == 'o')
default_base = 8;
else if (str.back() == 'h')
default_base = 16;
// when $display()/$write() functions are used in an initial block, print them during synthesis
Fmt fmt = processFormat(stage, /*sformat_like=*/false, default_base, /*first_arg_at=*/0, /*may_fail=*/true);
if (str.substr(0, 8) == "$display")
fmt.append_string("\n");
log("%s", fmt.render().c_str());
for (auto node : children)
while (node->simplify(true, stage, -1, false)) {}
return false;
delete_children();
str = std::string();
} else {
// when $display()/$write() functions are used in an always block, simplify the expressions and
// convert them to a special cell later in genrtlil
// simplify the expressions and convert them to a special cell later in genrtlil
for (auto node : children)
while (node->simplify(true, stage, -1, false)) {}
if (current_always->type == AST_INITIAL && !flag_nodisplay && stage == 2) {
int default_base = 10;
if (str.back() == 'b')
default_base = 2;
else if (str.back() == 'o')
default_base = 8;
else if (str.back() == 'h')
default_base = 16;
// when $display()/$write() functions are used in an initial block, print them during synthesis
Fmt fmt = processFormat(stage, /*sformat_like=*/false, default_base, /*first_arg_at=*/0, /*may_fail=*/true);
if (str.substr(0, 8) == "$display")
fmt.append_string("\n");
log("%s", fmt.render().c_str());
}
return false;
}
delete_children();
str = std::string();
}
// activate const folding if this is anything that must be evaluated statically (ranges, parameters, attributes, etc.)