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improved (fixed) conversion of real values to bit vectors

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This commit is contained in:
Clifford Wolf 2014-06-14 20:38:05 +02:00
parent 39eb347c67
commit 149fe83a8d
4 changed files with 30 additions and 11 deletions
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14
frontends/ast/simplify.cc
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@ -527,18 +527,18 @@ bool AstNode::simplify(bool const_fold, bool at_zero, bool in_lvalue, int stage,
// trim/extend parameters
if (type == AST_PARAMETER || type == AST_LOCALPARAM) {
if (children.size() > 1 && children[1]->type == AST_RANGE) {
if (!children[1]->range_valid)
log_error("Non-constant width range on parameter decl at %s:%d.\n", filename.c_str(), linenum);
int width = children[1]->range_left - children[1]->range_right + 1;
if (children[0]->type == AST_REALVALUE) {
int intvalue = round(children[0]->realvalue);
log("Warning: converting real value %e to integer %d at %s:%d.\n",
children[0]->realvalue, intvalue, filename.c_str(), linenum);
RTLIL::Const constvalue = children[0]->realAsConst(width);
log("Warning: converting real value %e to binary %s at %s:%d.\n",
realvalue, log_signal(constvalue), filename.c_str(), linenum);
delete children[0];
children[0] = mkconst_int(intvalue, sign_hint);
children[0] = mkconst_bits(constvalue.bits, sign_hint);
did_something = true;
}
if (children[0]->type == AST_CONSTANT) {
if (!children[1]->range_valid)
log_error("Non-constant width range on parameter decl at %s:%d.\n", filename.c_str(), linenum);
int width = children[1]->range_left - children[1]->range_right + 1;
if (width != int(children[0]->bits.size())) {
RTLIL::SigSpec sig(children[0]->bits);
sig.extend_u0(width, children[0]->is_signed);