void Default0( const SymbolicVal &v1, const SymbolicVal &v2)
{
Default1(v1,v2);
if (DebugCompareVal())
std::cerr << " in CompareOperator::Default \n";
if (result == REL_UNKNOWN) {
int tmp = comparetime;
SymbolicVal diff = v1 - v2;
comparetime = tmp;
if (diff.GetValType() == VAL_CONST) {
int diffval = atoi( diff.toString().c_str());
if (diffval < 0)
result = REL_LT;
else if (diffval > 0)
result = REL_GT;
else
result = REL_EQ;
}
else if (func != 0) {
int tmp = comparetime;
SymbolicBound b1 = GetValBound(v1,*func), b2 = GetValBound(v2,*func);
comparetime = tmp;
CompareRel ge1 = (b1.lb != v1)? CompareValHelp(b1.lb,v2,func) : REL_UNKNOWN;
CompareRel le2 = (b2.ub != v2)? CompareValHelp(b2.ub,v1,func) : REL_UNKNOWN;
CompareRel le1 = (b1.ub != v1)? CompareValHelp(b1.ub,v2,func) : REL_UNKNOWN;
CompareRel ge2 = (b2.lb != v2)? CompareValHelp(b2.lb,v1,func) : REL_UNKNOWN;
if (CountGT(ge1) || CountLT(le2))
result = REL_GT;
else if (CountGE(ge1) || CountLE(le2))
result = REL_GE;
else if (CountLT(le1) || CountGT(ge2))
result = REL_LT;
else if (CountLE(le1) || CountGE(ge2))
result = REL_LE;
}
}
}
bool AnalyzeEquation(const CoeffVec& vec, const BoundVec& bounds,
BoundOp& boundop,
Dep& result, const DepRel& rel)
{
int dim = vec.size()- 1;
std::vector<int> signs;
for (int index = 0; index < dim; ++index) {
if (vec[index]==0) {
signs.push_back(0);
continue;
}
SymbolicBound cb = GetValBound(vec[index], boundop);
assert(!cb.lb.IsNIL() && !cb.ub.IsNIL());
const SymbolicBound& b = bounds[index];
assert(!b.lb.IsNIL() && !b.ub.IsNIL());
if (b.lb >= 0) {
if (cb.lb >= 0)
signs.push_back(1);
else if (cb.ub <= 0)
signs.push_back(-1);
else {
if (DebugDep())
std::cerr << "unable to decide sign of coeff when lb >=0 for ivar[" << index << "]\n";
//return false;
signs.push_back(2);
}
}
else if (b.ub <= 0) {
if (cb.lb >= 0)
signs.push_back(-1);
else if (cb.ub <= 0)
signs.push_back(1);
else {
if (DebugDep())
std::cerr << "unable to decide sign of coeff when ub <=0 for ivar[" << index << "]\n";
//return false;
signs.push_back(2);
}
}
else {
if (DebugDep())
std::cerr << "unable to decide sign of ivar[" << index << "]\n";
//return false;
signs.push_back(2);
}
}
if (vec[dim] == 0)
signs.push_back(0);
else {
SymbolicVal leftval = vec[dim];
if (leftval.IsNIL()) {
if (DebugDep())
std::cerr << "unable to decide sign of leftval\n";
return false;
}
SymbolicBound lb = GetValBound(vec[dim], boundop);
if (lb.ub <= 0)
signs.push_back(-1);
else if (lb.lb >= 0)
signs.push_back(1);
else {
if (DebugDep())
std::cerr << "unable to decide sign of leftval\n";
return false;
//signs.push_back(2);
}
}
for (int i = 0; i < dim ; ++i) {
if (signs[i] == 0)
continue;
SymbolicVal coeff = vec[i];
assert(!coeff.IsNIL());
int j = 0;
for ( j = i+1; j < dim; ++j) {
if (signs[j] == 0 || coeff + vec[j] != 0)
continue;
int left = 0, k;
for (k = 0; k < dim ; ++k) {
if (k == i || k == j)
continue;
if (left == 0)
left = signs[k];
else if (signs[k] == 2 || signs[k] * left < 0)
break;
}
if ( k < dim || left == 2 || left * signs[dim] < 0)
continue;
int diff = 0, c = 1;
bool hasdiff = false;
if (left == 0 && vec[dim].isConstInt(diff) &&
(diff == 0 || coeff.isConstInt(c))) {
if (diff != 0 && c != 1) {
int odiff = diff;
diff = diff / c;
if (odiff != diff * c)
{
//DepStats.AddAdhocDV(DepStats.RoseToPlatoDV(DepRel(DEPDIR_NONE)));
result[i][j] = DepRel(DEPDIR_NONE);
return true;
}
}
hasdiff = true;
}
if (hasdiff) {
//DepStats.AddAdhocDV(DepStats.RoseToPlatoDV(DepRel(DEPDIR_EQ, diff)));
result[i][j] = rel * DepRel(DEPDIR_EQ, diff);
return true; // precise dependence
}
else if (signs[i] != 2) {
if (signs[dim]* signs[i] > 0) {
//DepStats.AddAdhocDV(DepStats.RoseToPlatoDV(DepRel(DEPDIR_GE, diff)));
result[i][j] = rel * DepRel(DEPDIR_GE, diff);
}
else {
//DepStats.AddAdhocDV(DepStats.RoseToPlatoDV(DepRel(DEPDIR_LE, diff)));
result[i][j] = rel * DepRel(DEPDIR_LE, diff);
}
}
}
}
return false;
}
