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Re: GSGC idea

I like it, except for the scanning the cache at flip time.  Instead of:

	if (cache[hash(ptr)] != ptr) {
		*writelist++ = cache[hash(ptr)];
		cache[hash(ptr)] = ptr;
	}

how about:

	if (cache[hash(ptr)] != ptr) {
		cache[hash(ptr)] = ptr;
		*writelist++ = ptr;
	}

This way the cache just needs to be zeroed at flip time, and it
doesn't take any more instructions.

-William