================
@@ -1262,6 +1262,18 @@ bool MachineLICMBase::IsProfitableToHoist(MachineInstr
&MI,
return false;
}
+ // If we have a COPY with other uses in the loop, hoist to allow the users to
----------------
davemgreen wrote:
Hello. From what I've seen in our benchmarks this has been positive, but there
is often some noise from hoisting/sinking. You are right that this could be
more conservative, but in our case cross register bank copies will be
relatively expensive and we would want to hoist them if we could. I'm not sure
about the subreg extracts, but a lot of COPYs are removed prior to register
allocation and it would be good if it knew where best to re-add them, if needed.
https://github.com/llvm/llvm-project/pull/71403
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