Christopher Haster 5fc53bd726 Changed internal functions to return tags over pointers ...

One neat (if gimmicky) trick, is that each tag has a valid bit in the
highest bit position of the 32-bit word. This is used to determine when
to stop a fetch operation, but after fetch, the bit is free to use in
the driver. This means we can create a typed-union of sorts with error
codes and tags, returning both as the return value from a function.

Say what you will about this trick, it does have a significant impact on
code size. I suspect this is primarily due to the compiler having a hard
time optimizing around pointer access.

2018-10-16 04:50:35 -05:00

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