It has been a long time coming that FEX no longer needed to leak IR
implementation details to the frontend, this was legacy due to IR CI and
various other problems.
Now that the last bits of IR leaking has been removed, move everything
that we can internally to the implementation.
We still have a couple of minor details in the exposed IR.h to the
frontend, but these are limited to a few enums and some thunking struct
information rather than all the implementation details.
No functional change with this, just moving headers around.
When the result of an atomic fetch operation is unused then we can
safely convert it to a non-fetching version of the operation.
This happens hundreds of times per process as far as I can tell. No idea
if this actually helps any hardware, but theoretically it can allow CPUs
to not stall waiting for writeback of the atomic operation.
Couldn't detect any performance improvements in the various little
things I was poking at least. Very trivial to support so add it.
Unaligned variants are already handled in our unaligned fault handler
since the only difference is the acquire semantic is dropped and the
destination register is the zero register.
It is not an external component, and it makes paths needlessly long.
Ryan seemed amenable to this when we discussed on IRC earlier.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Paulo Matos