Function NegateVectorConstant

source/opt/folding_rules.cpp:288–312

Negates the vector constant |c|. Returns the id of the defining instruction.

// Negates the vector constant |c|. Returns the id of the defining instruction.
uint32_t NegateVectorConstant(analysis::ConstantManager* const_mgr,
                              const analysis::Constant* c) {
  assert(const_mgr && c);
  assert(c->type()->AsVector());
  if (c->AsNullConstant()) {
    // 0.0 vs -0.0 shouldn't matter.
    return const_mgr->GetDefiningInstruction(c)->result_id();
  } else {
    const analysis::Type* component_type =
        c->AsVectorConstant()->component_type();
    std::vector<uint32_t> words;
    for (auto& comp : c->AsVectorConstant()->GetComponents()) {
      if (component_type->AsFloat()) {
        words.push_back(NegateFloatingPointConstant(const_mgr, comp));
      } else {
        assert(component_type->AsInteger());
        words.push_back(NegateIntegerConstant(const_mgr, comp));
      }
    }

    const analysis::Constant* negated_const =
        const_mgr->GetConstant(c->type(), std::move(words));
    return const_mgr->GetDefiningInstruction(negated_const)->result_id();
  }
}

// Negates |c|. Returns the id of the defining instruction.
uint32_t NegateConstant(analysis::ConstantManager* const_mgr,