Bit Reversal By Bit-Banging

Here's an interesting C function to reverse the bits of an unsigned integer:

unsigned int reverse(unsigned int v)
{
       v = (((v & 0xaaaaaaaa) >> 1) |
            ((v & 0x55555555) << 1));
       v = (((v & 0xcccccccc) >> 2) |
            ((v & 0x33333333) << 2));
       v = (((v & 0xf0f0f0f0) >> 4) |
            ((v & 0x0f0f0f0f) << 4));
       v = (((v & 0xff00ff00) >> 8) |
            ((v & 0x00ff00ff) << 8));
       return((v >> 16) | (v << 16));
}

I really need my reverse(0x77ff0300) in the morning! Sorry, bad joke (and for the odd word-wrapping)...