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Argument to $unsigned is self-determined. 

The argument to $unsigned is self-determined no matter what the
context the $unsigned itself is in. This is important only where
the result can be negative but the result width is context-determined.
Do ocntext fitting manually to prevent the context fitting it and
affecting the expression argument.

Signed-off-by: Stephen Williams <steve@icarus.com>
This commit is contained in:
Stephen Williams 2007-10-09 20:46:17 -07:00
parent c7edace243
commit ae16eacec9
2 changed files with 15 additions and 4 deletions
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2
PExpr.h
View File

@ -666,7 +666,7 @@ class PECallFunction : public PExpr {
bool check_call_matches_definition_(Design*des, NetScope*dscope) const;
NetExpr* elaborate_sfunc_(Design*des, NetScope*scope) const;
NetExpr* elaborate_sfunc_(Design*des, NetScope*scope, int expr_wid) const;
NetNet* elaborate_net_sfunc_(Design*des, NetScope*scope,
unsigned width,
const NetExpr* rise,

17
elab_expr.cc
View File

@ -372,7 +372,7 @@ unsigned PECallFunction::test_width(Design*des, NetScope*scope,
* size_tf functions, make assumptions about widths based on some
* known function names.
*/
NetExpr* PECallFunction::elaborate_sfunc_(Design*des, NetScope*scope) const
NetExpr* PECallFunction::elaborate_sfunc_(Design*des, NetScope*scope, int expr_wid) const
{
/* Catch the special case that the system function is the
@ -405,6 +405,10 @@ NetExpr* PECallFunction::elaborate_sfunc_(Design*des, NetScope*scope) const
PExpr*expr = parms_[0];
NetExpr*sub = expr->elaborate_expr(des, scope, -1, true);
sub->cast_signed(false);
if (expr_wid > sub->expr_width())
sub = pad_to_width(sub, expr_wid);
return sub;
}
@ -536,7 +540,7 @@ NetExpr* PECallFunction::elaborate_expr(Design*des, NetScope*scope,
int expr_wid, bool) const
{
if (peek_tail_name(path_)[0] == '$')
return elaborate_sfunc_(des, scope);
return elaborate_sfunc_(des, scope, expr_wid);
NetFuncDef*def = des->find_function(scope, path_);
if (def == 0) {
@ -570,7 +574,14 @@ NetExpr* PECallFunction::elaborate_expr(Design*des, NetScope*scope,
for (unsigned idx = 0 ; idx < parms.count() ; idx += 1) {
PExpr*tmp = parms_[idx];
if (tmp) {
parms[idx] = elab_and_eval(des, scope, tmp, -1);
int argwid = def->port(idx)->vector_width();
parms[idx] = elab_and_eval(des, scope, tmp, argwid);
if (debug_elaborate)
cerr << get_line() << ": debug:"
<< " function " << path_
<< " arg " << (idx+1)
<< " argwid=" << argwid
<< ": " << *parms[idx] << endl;
} else {
missing_parms += 1;