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Fix CA replication of zero issues. 

This patch fixes a CA to evaluate and ignore a replication of zero.
It also fixes a minor glitch in the data type calculation code. This
was causing a problem if a zero width replication was the first
element in a concatenation/replication since the data type was hard
coded to the first element of the concatenation/replication. It now
uses the first defined element in the concatenation/replication to
determine the data type.
(cherry picked from commit b629d913d2)
This commit is contained in:
Cary R 2009-07-24 11:59:10 -07:00 committed by Stephen Williams
parent 8ca5926db9
commit 693fb93962
1 changed files with 13 additions and 3 deletions
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16
expr_synth.cc
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@ -722,25 +722,35 @@ NetNet* NetEConcat::synthesize(Design*des, NetScope*scope, NetExpr*root)
unsigned nparms = parms_.count();
NetNet**tmp = new NetNet*[parms_.count()];
bool flag = true;
ivl_variable_type_t data_type = IVL_VT_NO_TYPE;
for (unsigned idx = 0 ; idx < parms_.count() ; idx += 1) {
if (parms_[idx]->expr_width() == 0) {
tmp[idx] = 0;
/* We need to synthesize a replication of zero. */
tmp[idx] = parms_[idx]->synthesize(des, scope, root);
assert(tmp[idx] == 0);
nparms -= 1;
} else {
tmp[idx] = parms_[idx]->synthesize(des, scope, root);
if (tmp[idx] == 0) flag = false;
/* Set the data type to the first one found. */
if (data_type == IVL_VT_NO_TYPE) {
data_type = tmp[idx]->data_type();
}
}
}
if (flag == false) return 0;
ivl_assert(*this, tmp[0]);
ivl_assert(*this, data_type != IVL_VT_NO_TYPE);
/* If this is a replication of zero just return 0. */
if (expr_width() == 0) return 0;
/* Make a NetNet object to carry the output vector. */
perm_string path = scope->local_symbol();
NetNet*osig = new NetNet(scope, path, NetNet::IMPLICIT, expr_width());
osig->local_flag(true);
osig->data_type(tmp[0]->data_type());
osig->data_type(data_type);
NetConcat*concat = new NetConcat(scope, scope->local_symbol(),
osig->vector_width(),