Having more fine-grained information on the specific construct that
caused us to fallback is valuable for large-scale data collection.
We still have the fallback warning, that's also used for FastISel.
We still need to remove the fallback warning, and teach FastISel to also
emit remarks (it currently has a combination of the warning, stats, and
debug prints: the remarks could unify all three).
The abort-on-fallback path could also be better handled using remarks:
one could imagine a "-Rpass-error", analoguous to "-Werror", which would
promote missed/failed remarks to errors. It's not clear whether that
would be useful for other remarks though, so we're not there yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296013 91177308-0d34-0410-b5e6-96231b3b80d8
Move the logic to constraint register from InstructionSelector to a
utility function. It will be required by other passes in the GlobalISel
pipeline.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290374 91177308-0d34-0410-b5e6-96231b3b80d8
