================
@@ -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
----------------
bjope wrote:
It is a bit tricky of course, depending on the properties of the target. For a
VLIW target like ours the COPY could be really cheap, at least if it can be
executed in parallel with something else without increasing latency. A
cross-bank copy might actually be fee (zero cycles) even if it is inside the
loop. OTOH. if we need to spill/reload a register, then that could be much more
expensive, even if it is hoisted to some outer loop.
https://github.com/llvm/llvm-project/pull/71403
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