While the progs engine itself implements the instructions correctly, the
opcode specs (and thus qfcc) treated the results as 32-bit (which was,
really, a hidden fixme, it seems).
This gets only some very basics working:
* Algebra (multi-vector) types: eg @algebra(float(3,0,1)).
* Algebra scopes (using either the above or @algebra(TYPE_NAME) where
the above was used in a typedef.
* Basis blades (eg, e12) done via procedural symbols that evaluate to
suitable constants based on the basis group for the blade.
* Addition and subtraction of multi-vectors (only partially tested).
* Assignment of sub-algebra multi-vectors to full-algebra multi-vectors
(missing elements zeroed).
There's still much work to be done, but I thought it time to get
something into git.
I'd created new_value_expr some time ago, but never used it...
Also, replace convert_* with cast_expr to the appropriate type (removes
a pile of value check and create code).
Nicely, I was able to reuse the generated conversion code used by the
progs engine to do the work in qfcc, just needed appropriate definitions
for the operand macros, and to set up the conversion code. Helped
greatly by the new value load/store functions.
