The encoding of constant, relative, and relative-const src registers is
a bit more complex than originally thought, which gives an extra bit to
encode const reg # at expense of taking a bit from relative offset.
In most cases a3xx seems to actually use a scheme whereby it can encode
an extra bit for const register. You have three possible encodings in
thirteen bits:
register: (11 bits for N.c)
00........... rN.c
relative: (10 bits for N)
010.......... r<a0.x + N>
011.......... c<a0.x + N>
const: (12 bits for N.c)
1............ cN.c
Which means we can deal w/ more consts than previously thought.
Signed-off-by: Rob Clark <robclark@freedesktop.org>
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