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eval_tree.cc
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eval_tree.cc
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/*
* Copyright (c) 1999-2010 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
# include "config.h"
# include "compiler.h"
# include <iostream>
# include <cstdlib>
# include <cstring>
# include <cmath>
# include "netlist.h"
# include "ivl_assert.h"
# include "netmisc.h"
NetExpr* NetExpr::eval_tree(int prune_to_width)
{
return 0;
}
static bool get_real_arg_(NetExpr*expr, verireal&val)
{
switch (expr->expr_type()) {
case IVL_VT_REAL: {
NetECReal*c = dynamic_cast<NetECReal*> (expr);
if (c == 0) return false;
val = c->value();
break;
}
case IVL_VT_BOOL:
case IVL_VT_LOGIC: {
NetEConst*c = dynamic_cast<NetEConst*>(expr);
if (c == 0) return false;
verinum tmp = c->value();
val = verireal(tmp.as_double());
break;
}
default:
assert(0);
}
return true;
}
bool NetEBinary::get_real_arguments_(verireal&lval, verireal&rval)
{
if (!get_real_arg_(left_, lval)) return false;
if (!get_real_arg_(right_, rval)) return false;
return true;
}
NetExpr* NetEBAdd::eval_tree(int prune_to_width)
{
eval_expr(left_, prune_to_width);
eval_expr(right_, prune_to_width);
if (left_->expr_type() == IVL_VT_REAL || right_->expr_type()==IVL_VT_REAL)
return eval_tree_real_();
NetEConst*lc = dynamic_cast<NetEConst*>(left_);
NetEConst*rc = dynamic_cast<NetEConst*>(right_);
/* If both operands are constant, then replace the entire
expression with a constant value. */
if (lc != 0 && rc != 0) {
verinum lval = lc->value();
verinum rval = rc->value();
verinum val;
switch (op_) {
case '+':
val = lval + rval;
break;
case '-':
val = lval - rval;
break;
default:
return 0;
}
if (debug_eval_tree) {
cerr << get_fileline() << ": debug: Evaluate expr=" << *this
<< " --- prune=" << prune_to_width
<< " has_width=" << (has_width()? "true" : "false") << endl;
}
/* Result might have known width. */
if (has_width()) {
unsigned lwid = lc->expr_width();
unsigned rwid = rc->expr_width();
unsigned wid = (rwid > lwid) ? rwid : lwid;
if (prune_to_width < 0)
wid += 1;
verinum val2=verinum(val,wid);
val=val2;
} else {
/* No fixed width, so trim the bits losslessly. */
verinum val2 = trim_vnum(val);
val = val2;
}
return new NetEConst(val);
}
/* Try to combine a right constant value with the right
constant value of a sub-expression add. For example, the
expression (a + 2) - 1 can be rewritten as a + 1. */
NetEBAdd*se = dynamic_cast<NetEBAdd*>(left_);
lc = se? dynamic_cast<NetEConst*>(se->right_) : 0;
if (lc != 0 && rc != 0) {
ivl_assert(*this, se != 0);
if (debug_eval_tree) {
cerr << get_fileline() << ": debug: "
<< "Partially evaluate " << *this
<< " using (a+2)-1 --> (a+1) transform." << endl;
}
verinum lval = lc->value();
verinum rval = rc->value();
if (lval.len() < expr_width())
lval = pad_to_width(lval, expr_width());
if (rval.len() < expr_width())
rval = pad_to_width(rval, expr_width());
if (se->expr_width() > this->expr_width()) {
cerr << get_fileline() << ": internal error: "
<< "expr_width()=" << expr_width()
<< ", sub expr_width()=" << se->expr_width()
<< ", sub expression=" << *se << endl;
}
ivl_assert(*this, se->expr_width() <= this->expr_width());
verinum val;
if (op_ == se->op_) {
/* (a + lval) + rval --> a + (rval+lval) */
/* (a - lval) - rval --> a - (rval+lval) */
val = rval + lval;
} else {
/* (a - lval) + rval --> a + (rval-lval) */
/* (a + lval) - rval --> a - (rval-lval) */
val = rval - lval;
}
// Since we padded the operands above to be the minimum
// width, the val should also be at least expr_width().
ivl_assert(*this, val.len() >= expr_width());
if (val.len() > expr_width()) {
verinum tmp (val, expr_width());
tmp.has_sign(val.has_sign());
val = tmp;
}
NetEConst*tmp = new NetEConst(val);
left_ = se->left_->dup_expr();
delete se;
tmp->set_line(*right_);
delete right_;
right_ = tmp;
/* We've changed the subexpression, but the result is
still not constant, so return nil here anyhow. */
return 0;
}
/* Nothing more to be done, the value is not constant. */
return 0;
}
NetECReal* NetEBAdd::eval_tree_real_()
{
verireal lval;
verireal rval;
bool flag = get_real_arguments_(lval, rval);
if (!flag) return 0;
verireal res_val;
switch (op()) {
case '+':
res_val = lval + rval;
break;
case '-':
res_val = lval - rval;
break;
default:
ivl_assert(*this, 0);
}
NetECReal*res = new NetECReal( res_val );
res->set_line(*this);
return res;
}
NetEConst* NetEBBits::eval_tree(int prune_to_width)
{
eval_expr(left_);
eval_expr(right_);
NetEConst*lc = dynamic_cast<NetEConst*>(left_);
NetEConst*rc = dynamic_cast<NetEConst*>(right_);
if (lc == 0 || rc == 0) return 0;
/* Notice the special case where one of the operands is 0 and
this is a bitwise &. If this happens, then the result is
known to be 0. */
if ((op() == '&') && (lc->value() == verinum(0))) {
verinum res (verinum::V0, expr_width());
return new NetEConst(res);
}
if ((op() == '&') && (rc->value() == verinum(0))) {
verinum res (verinum::V0, expr_width());
return new NetEConst(res);
}
verinum lval = lc->value();
verinum rval = rc->value();
unsigned lwid = lc->expr_width();
if (lwid == 0) lwid = lval.len();
unsigned rwid = rc->expr_width();
if (rwid == 0) rwid = rval.len();
unsigned wid = expr_width();
if (wid == 0)
wid = (rwid > lwid)? rwid : lwid;
verinum res (verinum::V0, wid);
if (lwid > wid)
lwid = wid;
if (rwid > wid)
rwid = wid;
// Sub-expressions of bitwise operators need to be the same
// width. Pad them out if necessary.
if (lwid < wid) {
lval = pad_to_width(lval, wid);
lwid = wid;
}
if (rwid < wid) {
rval = pad_to_width(rval, wid);
rwid = wid;
}
switch (op()) {
case '|': {
unsigned cnt = lwid;
if (cnt > wid) cnt = wid;
if (cnt > rwid) cnt = rwid;
for (unsigned idx = 0 ; idx < cnt ; idx += 1)
res.set(idx, lval.get(idx) | rval.get(idx));
if (lwid < rwid)
for (unsigned idx = lwid ; idx < rwid ; idx += 1)
res.set(idx, rval.get(idx));
if (rwid < lwid)
for (unsigned idx = rwid ; idx < lwid ; idx += 1)
res.set(idx, lval.get(idx));
break;
}
case '&': {
unsigned cnt = lwid;
if (cnt > wid) cnt = wid;
if (cnt > rwid) cnt = rwid;
for (unsigned idx = 0 ; idx < cnt ; idx += 1)
res.set(idx, lval.get(idx) & rval.get(idx));
break;
}
case '^': {
unsigned cnt = lwid;
if (cnt > wid) cnt = wid;
if (cnt > rwid) cnt = rwid;
for (unsigned idx = 0 ; idx < cnt ; idx += 1)
res.set(idx, lval.get(idx) ^ rval.get(idx));
if (lwid < rwid)
for (unsigned idx = lwid ; idx < rwid ; idx += 1)
res.set(idx, rval.get(idx));
if (rwid < lwid)
for (unsigned idx = rwid ; idx < lwid ; idx += 1)
res.set(idx, lval.get(idx));
break;
}
default:
return 0;
}
return new NetEConst(res);
}
NetEConst* NetEBComp::eval_less_()
{
if (right_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(left_, right_, false);
if (left_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(left_, right_, false);
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
verinum rv = r->value();
if (! rv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (NetEConst*tmp = must_be_leeq_(left_, rv, false)) {
return tmp;
}
/* Now go on to the normal test of the values. */
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
verinum lv = l->value();
if (! lv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (lv < rv) {
verinum result(verinum::V1, 1);
return new NetEConst(result);
} else {
verinum result(verinum::V0, 1);
return new NetEConst(result);
}
}
NetEConst* NetEBComp::eval_leeq_real_(NetExpr*le, NetExpr*ri, bool eq_flag)
{
NetEConst*vtmp;
NetECReal*rtmp;
double lv, rv;
switch (le->expr_type()) {
case IVL_VT_REAL:
rtmp = dynamic_cast<NetECReal*> (le);
if (rtmp == 0) return 0;
lv = rtmp->value().as_double();
break;
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
vtmp = dynamic_cast<NetEConst*> (le);
if (vtmp == 0) return 0;
lv = vtmp->value().as_double();
break;
default:
lv = 0.0;
cerr << get_fileline() << ": internal error: "
<< "Unexpected expression type? " << le->expr_type() << endl;
assert(0);
}
switch (ri->expr_type()) {
case IVL_VT_REAL:
rtmp = dynamic_cast<NetECReal*> (ri);
if (rtmp == 0) return 0;
rv = rtmp->value().as_double();
break;
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
vtmp = dynamic_cast<NetEConst*> (ri);
if (vtmp == 0) return 0;
rv = vtmp->value().as_double();
break;
default:
rv = 0.0;
cerr << get_fileline() << ": internal error: "
<< "Unexpected expression type? " << ri->expr_type() << endl;
assert(0);
}
bool test = false;
if (lv < rv) test = true;
if (test == false && eq_flag && lv == rv) test = true;
verinum result(test? verinum::V1 : verinum::V0, 1);
vtmp = new NetEConst(result);
vtmp->set_line(*this);
return vtmp;
}
NetEConst* NetEBComp::must_be_leeq_(NetExpr*le, const verinum&rv, bool eq_flag)
{
assert(le->expr_width() > 0);
verinum lv (verinum::V1, le->expr_width());
if (le->has_sign() && rv.has_sign()) {
// If the expression is signed, then the largest
// possible value for the left_ needs to have a 0 in the
// sign position.
lv.set(lv.len()-1, verinum::V0);
lv.has_sign(true);
}
if (lv < rv || (eq_flag && (lv == rv))) {
verinum result(verinum::V1, 1);
return new NetEConst(result);
}
return 0;
}
NetEConst* NetEBComp::eval_leeq_()
{
if (right_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(left_, right_, true);
if (left_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(left_, right_, true);
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
verinum rv = r->value();
if (! rv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (left_->expr_width() == 0) {
cerr << get_fileline() << ": internal error: Something wrong "
<< "with the left side width of <= ?" << endl;
cerr << get_fileline() << ": : " << *this << endl;
}
if (NetEConst*tmp = must_be_leeq_(left_, rv, true)) {
return tmp;
}
/* Now go on to the normal test of the values. */
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
verinum lv = l->value();
if (! lv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (lv <= rv) {
verinum result(verinum::V1, 1);
return new NetEConst(result);
} else {
verinum result(verinum::V0, 1);
return new NetEConst(result);
}
}
NetEConst* NetEBComp::eval_gt_()
{
if (right_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(right_, left_, false);
if (left_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(right_, left_, false);
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
verinum lv = l->value();
if (! lv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (NetEConst*tmp = must_be_leeq_(right_, lv, false)) {
return tmp;
}
/* Now go on to the normal test of the values. */
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
verinum rv = r->value();
if (! rv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (lv > rv) {
verinum result(verinum::V1, 1);
return new NetEConst(result);
} else {
verinum result(verinum::V0, 1);
return new NetEConst(result);
}
}
NetEConst* NetEBComp::eval_gteq_()
{
if (right_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(right_, left_, true);
if (left_->expr_type() == IVL_VT_REAL)
return eval_leeq_real_(right_, left_, true);
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
verinum lv = l->value();
if (! lv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (NetEConst*tmp = must_be_leeq_(right_, lv, true)) {
return tmp;
}
/* Now go on to the normal test of the values. */
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
verinum rv = r->value();
if (! rv.is_defined()) {
verinum result(verinum::Vx, 1);
return new NetEConst(result);
}
if (lv >= rv) {
verinum result(verinum::V1, 1);
return new NetEConst(result);
} else {
verinum result(verinum::V0, 1);
return new NetEConst(result);
}
}
/*
* Evaluate <A>==<B> or <A>!=<B>. The equality operator checks all the
* bits and returns true(false) if there are any bits in the vector
* that are defined (0 or 1) and different. If all the defined bits
* are equal, but there are are x/z bits, then the situation is
* ambiguous so the result is x.
*/
NetEConst* NetEBComp::eval_eqeq_real_(NetExpr*le, NetExpr*ri, bool ne_flag)
{
NetEConst*vtmp;
NetECReal*rtmp;
double lv, rv;
switch (le->expr_type()) {
case IVL_VT_REAL:
rtmp = dynamic_cast<NetECReal*> (le);
if (rtmp == 0) return 0;
lv = rtmp->value().as_double();
break;
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
vtmp = dynamic_cast<NetEConst*> (le);
if (vtmp == 0) return 0;
lv = vtmp->value().as_double();
break;
default:
lv = 0.0;
cerr << get_fileline() << ": internal error: "
<< "Unexpected expression type? " << le->expr_type() << endl;
assert(0);
}
switch (ri->expr_type()) {
case IVL_VT_REAL:
rtmp = dynamic_cast<NetECReal*> (ri);
if (rtmp == 0) return 0;
rv = rtmp->value().as_double();
break;
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
vtmp = dynamic_cast<NetEConst*> (ri);
if (vtmp == 0) return 0;
rv = vtmp->value().as_double();
break;
default:
rv = 0.0;
cerr << get_fileline() << ": internal error: "
<< "Unexpected expression type? " << ri->expr_type() << endl;
assert(0);
}
verinum result(((lv == rv) ^ ne_flag) ? verinum::V1 : verinum::V0, 1);
vtmp = new NetEConst(result);
vtmp->set_line(*this);
return vtmp;
}
NetEConst* NetEBComp::eval_eqeq_(bool ne_flag)
{
if (right_->expr_type() == IVL_VT_REAL)
return eval_eqeq_real_(right_, left_, ne_flag);
if (left_->expr_type() == IVL_VT_REAL)
return eval_eqeq_real_(right_, left_, ne_flag);
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
const verinum&lv = l->value();
const verinum&rv = r->value();
const verinum::V eq_res = ne_flag? verinum::V0 : verinum::V1;
const verinum::V ne_res = ne_flag? verinum::V1 : verinum::V0;
verinum::V res = eq_res;
unsigned top = lv.len();
if (rv.len() < top)
top = rv.len();
for (unsigned idx = 0 ; idx < top ; idx += 1) {
bool x_bit_present = false;
switch (lv.get(idx)) {
case verinum::Vx:
case verinum::Vz:
res = verinum::Vx;
x_bit_present = true;
break;
default:
break;
}
switch (rv.get(idx)) {
case verinum::Vx:
case verinum::Vz:
res = verinum::Vx;
x_bit_present = true;
break;
default:
break;
}
if (x_bit_present)
continue;
if (rv.get(idx) != lv.get(idx)) {
res = ne_res;
break;
}
}
if (res != verinum::Vx) {
verinum::V lpad = verinum::V0;
verinum::V rpad = verinum::V0;
if (lv.has_sign() && lv.get(lv.len()-1) == verinum::V1)
lpad = verinum::V1;
if (rv.has_sign() && rv.get(rv.len()-1) == verinum::V1)
rpad = verinum::V1;
for (unsigned idx = top ; idx < lv.len() ; idx += 1)
switch (lv.get(idx)) {
case verinum::Vx:
case verinum::Vz:
res = verinum::Vx;
break;
case verinum::V0:
if (res != verinum::Vx && rpad != verinum::V0)
res = ne_res;
break;
case verinum::V1:
if (res != verinum::Vx && rpad != verinum::V1)
res = ne_res;
break;
default:
break;
}
for (unsigned idx = top ; idx < rv.len() ; idx += 1)
switch (rv.get(idx)) {
case verinum::Vx:
case verinum::Vz:
res = verinum::Vx;
break;
case verinum::V0:
if (res != verinum::Vx && lpad != verinum::V0)
res = ne_res;
break;
case verinum::V1:
if (res != verinum::Vx && lpad != verinum::V1)
res = ne_res;
break;
default:
break;
}
}
return new NetEConst(verinum(res));
}
NetEConst* NetEBComp::eval_eqeqeq_()
{
NetEConst*l = dynamic_cast<NetEConst*>(left_);
if (l == 0) return 0;
NetEConst*r = dynamic_cast<NetEConst*>(right_);
if (r == 0) return 0;
const verinum&lv = l->value();
const verinum&rv = r->value();
verinum::V res = verinum::V1;
unsigned cnt = lv.len();
if (cnt > rv.len())
cnt = rv.len();
for (unsigned idx = 0 ; idx < cnt ; idx += 1)
if (lv.get(idx) != rv.get(idx))
res = verinum::V0;
for (unsigned idx = cnt ; idx < lv.len() ; idx += 1)
if (lv.get(idx) != verinum::V0)
res = verinum::V0;
for (unsigned idx = cnt ; idx < rv.len() ; idx += 1)
if (rv.get(idx) != verinum::V0)
res = verinum::V0;
return new NetEConst(verinum(res, 1));
}
NetEConst* NetEBComp::eval_neeqeq_()
{
NetEConst*tmp = eval_eqeqeq_();
if (tmp == 0)
return 0;
NetEConst*res;
if (tmp->value().get(0) == verinum::V0)
res = new NetEConst(verinum(verinum::V1,1));
else
res = new NetEConst(verinum(verinum::V0,1));
delete tmp;
res->set_line(*this);
return res;
}
NetEConst* NetEBComp::eval_tree(int prune_to_width)
{
eval_expr(left_);
eval_expr(right_);
switch (op_) {
case 'E': // Case equality (===)
return eval_eqeqeq_();
case 'e': // Equality (==)
return eval_eqeq_(false);
case 'G': // >=
return eval_gteq_();
case 'L': // <=
return eval_leeq_();
case 'N': // Case inequality (!==)
return eval_neeqeq_();
case 'n': // not-equal (!=)
return eval_eqeq_(true);
case '<': // Less than
return eval_less_();
case '>': // Greater than
return eval_gt_();
default:
return 0;
}
}
NetExpr* NetEBDiv::eval_tree_real_()
{
verireal lval;
verireal rval;
bool flag = get_real_arguments_(lval, rval);
if (! flag) return 0;
NetECReal*res = 0;
switch (op_) {
case '/':
res = new NetECReal(lval / rval);
break;
case '%':
// Since this could/may be called early we don't want to
// leak functionality.
if (!gn_icarus_misc_flag) return 0;
res = new NetECReal(lval % rval);
break;
}
ivl_assert(*this, res);
res->set_line(*this);
return res;
}
/*
* The NetEBDiv operator includes the / and % operators. First evaluate
* the sub-expressions, then perform the required operation.
*/
NetExpr* NetEBDiv::eval_tree(int prune_to_width)
{
eval_expr(left_);
eval_expr(right_);
if (expr_type() == IVL_VT_REAL) return eval_tree_real_();
assert(expr_type() == IVL_VT_LOGIC);
NetEConst*lc = dynamic_cast<NetEConst*>(left_);
NetEConst*rc = dynamic_cast<NetEConst*>(right_);
if (lc == 0 || rc == 0) return 0;
// Make sure the expression is evaluated at the
// expression width.
verinum lval = pad_to_width(lc->value(), expr_width());
verinum rval = pad_to_width(rc->value(), expr_width());
NetExpr*tmp = 0;
switch (op_) {
case '/':
tmp = new NetEConst(lval / rval);
break;
case '%':
tmp = new NetEConst(lval % rval);
break;
}
ivl_assert(*this, tmp);
tmp->set_line(*this);
return tmp;
}
NetEConst* NetEBLogic::eval_tree(int prune_to_width)
{
eval_expr(left_);
eval_expr(right_);
NetEConst*lc = dynamic_cast<NetEConst*>(left_);
NetEConst*rc = dynamic_cast<NetEConst*>(right_);
if (lc == 0 || rc == 0) return 0;
verinum::V lv = verinum::V0;
verinum::V rv = verinum::V0;
verinum v = lc->value();
for (unsigned idx = 0 ; idx < v.len() ; idx += 1)
if (v.get(idx) == verinum::V1)
lv = verinum::V1;
if (lv == verinum::V0)
for (unsigned idx = 0 ; idx < v.len() ; idx += 1)
if (v.get(idx) != verinum::V0)
lv = verinum::Vx;
v = rc->value();
for (unsigned idx = 0 ; idx < v.len() ; idx += 1)
if (v.get(idx) == verinum::V1)
rv = verinum::V1;
if (rv == verinum::V0)
for (unsigned idx = 0 ; idx < v.len() ; idx += 1)
if (v.get(idx) != verinum::V0)
rv = verinum::Vx;
verinum::V res;
switch (op_) {
case 'a': { // Logical AND (&&)
if ((lv == verinum::V0) || (rv == verinum::V0))
res = verinum::V0;
else if ((lv == verinum::V1) && (rv == verinum::V1))
res = verinum::V1;
else
res = verinum::Vx;
break;
}
case 'o': { // Logical OR (||)
if ((lv == verinum::V1) || (rv == verinum::V1))
res = verinum::V1;
else if ((lv == verinum::V0) && (rv == verinum::V0))
res = verinum::V0;
else
res = verinum::Vx;
break;
}
default:
return 0;
}
return new NetEConst(verinum(res, 1));
}
NetExpr* NetEBMult::eval_tree_real_()
{
verireal lval;
verireal rval;
bool flag = get_real_arguments_(lval, rval);
if (! flag) return 0;
NetECReal*res = new NetECReal(lval * rval);
res->set_line(*this);
return res;
}
NetExpr* NetEBMult::eval_tree(int prune_to_width)
{
eval_expr(left_);
eval_expr(right_);
if (expr_type() == IVL_VT_REAL) return eval_tree_real_();
assert(expr_type() == IVL_VT_LOGIC);
NetEConst*lc = dynamic_cast<NetEConst*>(left_);
NetEConst*rc = dynamic_cast<NetEConst*>(right_);
if (lc == 0 || rc == 0) return 0;
verinum lval = lc->value();
verinum rval = rc->value();
NetEConst*tmp = new NetEConst(lval * rval);
if (debug_eval_tree)
cerr << get_fileline() << ": debug: Evaluate "
<< lval << " * " << rval << " --> " << *tmp << endl;
return tmp;
}
NetExpr* NetEBPow::eval_tree_real_()
{
verireal lval;
verireal rval;
bool flag = get_real_arguments_(lval, rval);
if (! flag) return 0;