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	     * this is done often , but optimizing is not so
	     * fruitful, at least in the obvious ways (unrolling)
	     */
	    DEB( pivswaps++ ; )
	    c = inverse[ c ] ;
	    pivot_row[icol] = 1 ;
	    for (ix = 0 ; ix < k ; ix++ )
		pivot_row[ix] = gf_mul(c, pivot_row[ix] );
	}
	/*
	 * from all rows, remove multiples of the selected row
	 * to zero the relevant entry (in fact, the entry is not zero
	 * because we know it must be zero).
	 * (Here, if we know that the pivot_row is the identity,
	 * we can optimize the addmul).
	 */
	id_row[icol] = 1;
	if (bcmp(pivot_row, id_row, k*sizeof(gf)) != 0) {
	    for (p = src, ix = 0 ; ix < k ; ix++, p += k ) {
		if (ix != icol) {
		    c = p[icol] ;