if (BinaryOperator::isNeg(Sub) || BinaryOperator::isFNeg(Sub))
return false;
+ // Don't breakup X - undef.
+ if (isa<UndefValue>(Sub->getOperand(1)))
+ return false;
+
// Don't bother to break this up unless either the LHS is an associable add or
// subtract or if this is only used by one.
Value *V0 = Sub->getOperand(0);
Value *X) {
unsigned XRank = Ops[i].Rank;
unsigned e = Ops.size();
- for (unsigned j = i+1; j != e && Ops[j].Rank == XRank; ++j)
+ for (unsigned j = i+1; j != e && Ops[j].Rank == XRank; ++j) {
if (Ops[j].Op == X)
return j;
+ if (Instruction *I1 = dyn_cast<Instruction>(Ops[j].Op))
+ if (Instruction *I2 = dyn_cast<Instruction>(X))
+ if (I1->isIdenticalTo(I2))
+ return j;
+ }
// Scan backwards.
- for (unsigned j = i-1; j != ~0U && Ops[j].Rank == XRank; --j)
+ for (unsigned j = i-1; j != ~0U && Ops[j].Rank == XRank; --j) {
if (Ops[j].Op == X)
return j;
+ if (Instruction *I1 = dyn_cast<Instruction>(Ops[j].Op))
+ if (Instruction *I2 = dyn_cast<Instruction>(X))
+ if (I1->isIdenticalTo(I2))
+ return j;
+ }
return i;
}