Function codecommutative

3rdparty/lua/plainlua/lcode.c:1517–1528

** Code commutative operators ('+', '*'). If first operand is a ** numeric constant, change order of operands to try to use an ** immediate or K operator. */

** immediate or K operator.
*/
static void codecommutative (FuncState *fs, BinOpr op,
                             expdesc *e1, expdesc *e2, int line) {
  int flip = 0;
  if (tonumeral(e1, NULL)) {  /* is first operand a numeric constant? */
    swapexps(e1, e2);  /* change order */
    flip = 1;
  }
  if (op == OPR_ADD && isSCint(e2))  /* immediate operand? */
    codebini(fs, OP_ADDI, e1, e2, flip, line, TM_ADD);
  else
    codearith(fs, op, e1, e2, flip, line);
}


/*