Tony Wasserka
6b538506f2
ACO attempts to store the output of an instruction in the same register
occupied by its operands where possible. Importantly this only works if
the operands are large enough to store the result register size. The code
failed to consider subdword operands when checking for this, causing
entire register slots to be freed up even though subdword parts were still
used.
In Mafia 3, this affected the following code:
v2b: %363:v[2][0:16], v2b: %362:v[2][16:32] = p_split_vector %360:v[2]
v1: %116:v[2] = v_cvt_f32_f16 %362:v[2][16:32]
v1: %117:v[2] = v_cvt_f32_f16 %363:v[2][0:16]
where v[2] is allocated to %116 even though its original lower 16 bits are
still used in the instruction after.
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3717
Fixes: 031edbc4a5
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7461>
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