Function fxBigInt_sub

xs/sources/xsBigInt.c:1394–1409

}

txBigInt *fxBigInt_sub(txMachine* the, txBigInt *rr, txBigInt *aa, txBigInt *bb)
{
	if ((aa->sign ^ bb->sign) == 0) {
		if (!aa->sign)
			rr = fxBigInt_usub(the, rr, aa, bb);
		else
			rr = fxBigInt_usub(the, rr, bb, aa);
	}
	else {
		txU1 sign = aa->sign;	/* could be replaced if rr=aa */
		rr = fxBigInt_uadd(the, rr, aa, bb);
		rr->sign = sign;
	}
	mxBigInt_meter(rr->size);
	return(rr);
}

#if __has_builtin(__builtin_add_overflow)
static int fxBigInt_uadd_prim(txU4 *rp, txU4 *ap, txU4 *bp, int an, int bn)