Function codeorder

third-party/lua-5.4.6/src/lcode.c:1553–1578

** Emit code for order comparisons. When using an immediate operand, ** 'isfloat' tells whether the original value was a float. */

** 'isfloat' tells whether the original value was a float.
*/
static void codeorder (FuncState *fs, BinOpr opr, expdesc *e1, expdesc *e2) {
  int r1, r2;
  int im;
  int isfloat = 0;
  OpCode op;
  if (isSCnumber(e2, &im, &isfloat)) {
    /* use immediate operand */
    r1 = luaK_exp2anyreg(fs, e1);
    r2 = im;
    op = binopr2op(opr, OPR_LT, OP_LTI);
  }
  else if (isSCnumber(e1, &im, &isfloat)) {
    /* transform (A < B) to (B > A) and (A <= B) to (B >= A) */
    r1 = luaK_exp2anyreg(fs, e2);
    r2 = im;
    op = binopr2op(opr, OPR_LT, OP_GTI);
  }
  else {  /* regular case, compare two registers */
    r1 = luaK_exp2anyreg(fs, e1);
    r2 = luaK_exp2anyreg(fs, e2);
    op = binopr2op(opr, OPR_LT, OP_LT);
  }
  freeexps(fs, e1, e2);
  e1->u.info = condjump(fs, op, r1, r2, isfloat, 1);
  e1->k = VJMP;
}


/*