Optimization for 3GPP issue 851: Issue in dft stereo at 32 kbps for residual...

    UWord32 val;

    UWord32 low;   /* local copy (2 to 6 uses) */

    UWord32 range; /* local copy (4 to 7 uses) */

    Word16 norm_range;

    UWord32 temp1, temp2;

    Word16 exp_temp1;

    UWord32 tmp;

    low = rc_st_dec->rc_low;     /*Q0*/

    range = rc_st_dec->rc_range; /*Q0*/

    move32();

    move32();

    range = (UWord32) W_shr( range, bits ); /*range >>= bits*/

    exp_temp1 = sub( W_norm( low ), 31 + 1 );

    temp1 = (UWord32) W_shl( low, exp_temp1 ); /*Q : W_norm( low ) - 32*/

    norm_range = sub( W_norm( range ), 31 );

    temp2 = (UWord32) W_shl( range, norm_range );                                             /*Q : W_norm( range ) - 31*/

    val = (UWord32) W_shr( UL_div( temp1, temp2 ), sub( add( 32, exp_temp1 ), norm_range ) ); /*Q0*/

    val = 0;

    move32();

    FOR( tmp = range; tmp <= low; tmp += range )

    {

        val = add( val, 1 );

    }

    /* in case of bitstream errors it is possible that val >= (1 << bits) */

    IF( W_shr( val, bits ) != 0 ) /* equivalent condition */