Function luaP_isIT

third-party/lua-5.5.0/src/lopcodes.c:131–139

** Check whether instruction uses top from previous instruction, that is, ** it accepts multiple results. */

** it accepts multiple results.
*/
int luaP_isIT (Instruction i) {
  OpCode op = GET_OPCODE(i);
  switch (op) {
    case OP_SETLIST:
      return testITMode(GET_OPCODE(i)) && GETARG_vB(i) == 0;
    default:
      return testITMode(GET_OPCODE(i)) && GETARG_B(i) == 0;
  }
}