Function codearith

lib/lua/src/lcode.c:1502–1508

** Code arithmetic operators ('+', '-', ...). If second operand is a ** constant in the proper range, use variant opcodes with K operands. */

** constant in the proper range, use variant opcodes with K operands.
*/
static void codearith (FuncState *fs, BinOpr opr,
                       expdesc *e1, expdesc *e2, int flip, int line) {
  if (tonumeral(e2, NULL) && luaK_exp2K(fs, e2))  /* K operand? */
    codebinK(fs, opr, e1, e2, flip, line);
  else  /* 'e2' is neither an immediate nor a K operand */
    codebinNoK(fs, opr, e1, e2, flip, line);
}


/*