Fri May 20 16:11:35 CEST 2011

Memory allocation and tagging rehash

I'm using 32-bit cells with 2 tag bits.  Tags are stored in a separate
RAM vector.  A pair needs two slots which leaves a 16-bit cell address
space.  This is 256kbytes.  That seems fine for the target uCs, which
have limited RAM and virtually unlimited Flash in comparison.

The interesting attribute here is that the pointers are clean: no tag
bit pollution, which means the non-managed opaque object management
can be separated completely from the GC.