Archipelago » qemu

/*

 * Checks whether the sector is not a zero sector.

 *

 * Attention! The len must be a multiple of 4 * sizeof(long) due to

 * restriction of optimizations in this function.

 */

    /*

     * Use long as the biggest available internal data type that fits into the

     * CPU register and unroll the loop to smooth out the effect of memory

     * latency.

     */

    long d0, d1, d2, d3;

    const long * const data = (const long *) sector;

    len /= sizeof(long);

    for(i = 0; i < len; i += 4) {

        d0 = data[i + 0];

        d1 = data[i + 1];

        d2 = data[i + 2];

        d3 = data[i + 3];

        if (d0 || d1 || d2 || d3) {

        }