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2012 Oct 26
0
[LLVMdev] Data sharing between two ALUs and avoiding illegal copies
...SGPRs, but the sALU can only read
from SGPRs. This restriction on the sALU seems to be causing the
instruction selector to generate some illegal copies, which is the main
problem I'm trying to solve. For example:
NODE0 = ISD::ADD SGPR0, VGPR0
can be selected to:
SGPR2 = COPY VGPR0
SGPR1 = S_ADD SGPR0, SGPR2
This leaves us with a copy from a VGPR to an SGPR, which is illegal.
Any suggestions on how to solve this problem or how best to model these
two ALUs?
Thanks,
Tom