Function NegateIntegerConstant

source/opt/folding_rules.cpp:268–285

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

// Negates the integer constant |c|. Returns the id of the defining instruction.
uint32_t NegateIntegerConstant(analysis::ConstantManager* const_mgr,
                               const analysis::Constant* c) {
  assert(c);
  assert(c->type()->AsInteger());
  uint32_t width = c->type()->AsInteger()->width();
  assert(width == 32 || width == 64);
  std::vector<uint32_t> words;
  if (width == 64) {
    uint64_t uval = static_cast<uint64_t>(0 - c->GetU64());
    words = ExtractInts(uval);
  } else {
    words.push_back(static_cast<uint32_t>(0 - c->GetU32()));
  }

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

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