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Properly extend/crop a user function argument in a continuous assignment. 

When passing an argument to a user function in a continuous assignment
we need to sign extend the value if it is signed and too short. We need
to crop an argument if it is too long.
This commit is contained in:
Cary R 2009-12-17 19:22:34 -08:00 committed by Stephen Williams
parent 0c3eef4c41
commit 7e06a87b8e
1 changed files with 9 additions and 3 deletions
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12
expr_synth.cc
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@ -1413,9 +1413,15 @@ NetNet* NetEUFunc::synthesize(Design*des, NetScope*scope, NetExpr*root)
/* Connect the pins to the arguments. */
NetFuncDef*def = func_->func_def();
for (unsigned idx = 0; idx < eparms.count(); idx += 1) {
NetNet*tmp = pad_to_width(des, eparms[idx],
def->port(idx)->vector_width(), *this);
connect(net->pin(idx+1), tmp->pin(0));
unsigned width = def->port(idx)->vector_width();
NetNet*tmp;
if (eparms[idx]->get_signed()) {
tmp = pad_to_width_signed(des, eparms[idx], width, *this);
} else {
tmp = pad_to_width(des, eparms[idx], width, *this);
}
NetNet*tmpc = crop_to_width(des, tmp, width);
connect(net->pin(idx+1), tmpc->pin(0));
}
return osig;