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Added support for $clog2 system function

This commit is contained in:
Clifford Wolf 2013-12-04 21:19:54 +01:00
parent 4a4a3fc337
commit 3c220e0b32
1 changed files with 20 additions and 4 deletions
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24
frontends/ast/simplify.cc
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@ -1052,11 +1052,27 @@ skip_dynamic_range_lvalue_expansion:;
// replace function and task calls with the code from the function or task
if ((type == AST_FCALL || type == AST_TCALL) && !str.empty())
{
if (type == AST_FCALL) {
if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION) {
current_ast_mod->dumpAst(stderr, "> ");
log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
if (type == AST_FCALL)
{
if (str == "\\$clog2")
{
AstNode *buf = children[0]->clone();
while (buf->simplify(true, false, false, stage, width_hint, sign_hint)) { }
if (!buf->type == AST_CONSTANT)
log_error("Failed to evaluate system function `%s' with non-constant value at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
RTLIL::Const arg_value = buf->bitsAsConst();
uint32_t result = 0;
for (size_t i = 0; i < arg_value.bits.size(); i++)
if (arg_value.bits.at(i) == RTLIL::State::S1)
result = i;
newNode = mkconst_int(result, false);
goto apply_newNode;
}
if (current_scope.count(str) == 0 || current_scope[str]->type != AST_FUNCTION)
log_error("Can't resolve function name `%s' at %s:%d.\n", str.c_str(), filename.c_str(), linenum);
}
if (type == AST_TCALL) {
if (current_scope.count(str) == 0 || current_scope[str]->type != AST_TASK)